By Topic

Microwave Theory and Techniques, IEEE Transactions on

Issue 5 • Date May 2004

Filter Results

Displaying Results 1 - 25 of 33
  • Table of contents

    Publication Year: 2004 , Page(s): c1 - c4
    Save to Project icon | Request Permissions | PDF file iconPDF (46 KB)  
    Freely Available from IEEE
  • IEEE Transactions on Microwave Theory and Techniques publication information

    Publication Year: 2004 , Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (38 KB)  
    Freely Available from IEEE
  • Uncertainties associated with many-port (>4) S-parameter measurements using a four-port vector network analyzer

    Publication Year: 2004 , Page(s): 1361 - 1368
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    While four-port vector network analyzers (VNAs) are now commercially available, there is an increasing need for S-parameter measurements of devices with more than four ports. Test sets and algorithms for performing many-port measurements have been known for some time, although extensions for four-port and larger VNAs have not been seen widely. This paper addresses a measurement approach and a method of obtaining approximate uncertainties for these measurements. It is well known that disregarding the load match of unused ports can have serious effects, but it has been found that these match terms can be handled reasonably well even when intra-device isolation levels are low. The impact of mismatch uncertainty on the impedance transforming algorithms themselves is also examined. Measurements using a nine-port test set connected to a four-port VNA are employed to illustrate the results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Novel folding technique for planar ferrite-coupled-line circulators

    Publication Year: 2004 , Page(s): 1369 - 1374
    Cited by:  Papers (5)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    A novel folding technique for a longitudinally magnetized ferrite-coupled-line (FCL) section is reported in this paper. The results from Ansoft HFSS simulations of a single-folded structure are presented for a 17-GHz folded stripline FCL section and the measurements on the 17-GHz folded stripline three-port FCL circulator confirm the folding concept and demonstrate that nonreciprocal behavior is retained. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characterization of spiral inductors with patterned floating structures

    Publication Year: 2004 , Page(s): 1375 - 1381
    Cited by:  Papers (27)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB) |  | HTML iconHTML  

    The impact of two different types of floating patterns on spiral inductors was investigated. Both patterned trench isolation with a floating p/n junction and floating metal poles were implemented underneath reference spiral inductors. All three types of inductors have an identical spiral geometry. Combination of patterned trench isolation with a floating p/n junction increases maximum quality factor (Qmax) by 17% compared to the reference inductors. The floating metal poles enable adjustment of the frequency at Qmax (fmax) without hampering the Qmax. A ladder-type lump-element model was employed to analyze inductor performance after it was demonstrated to precisely capture behavior of all three inductors. Enhancement of the quality factor due to patterned trench isolation with a floating p/n junction was found to result from an increment of effective resistivity in substrates. Reduction of the frequency fmax due to the floating metal poles was caused by increasing effective coupling capacitance between the spiral inductors and substrate. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 30-40-GHz drain-pumped passive-mixer MMIC fabricated on VLSI SOI CMOS technology

    Publication Year: 2004 , Page(s): 1382 - 1391
    Cited by:  Papers (35)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB) |  | HTML iconHTML  

    In this paper, a passive down mixer is proposed, which is well suited for short-channel field-effect transistor technologies. The authors believe that this is the first drain-pumped transconductance mixer that requires no dc supply power. The monolithic microwave integrated circuit (MMIC) is fabricated using digital 90-nm silicon-on-insulator CMOS technology. All impedance matching, bias, and filter elements are implemented on the chip, which has a compact size of 0.5 mm×0.47 mm. The circuit covers a radio frequency range from 30 to 40 GHz. At a RF frequency of 35 GHz, an intermediate frequency of 2.5 GHz and a local-oscillator (LO) power of 7.5 dBm, a conversion loss of 4.6 dB, a single-sideband (SSB) noise figure (NF) of 7.9 dB, an 1-dB input compression point of -6 dBm, and a third-order intercept point at the input of 2 dBm were measured. At lower LO power of 0 dBm, a conversion loss of 6.3 dBm and an SSB NF of 9.7 dB were measured, making the mixer an excellent candidate for low power-consuming wireless local-area networks. All results include the pad parasitics. To the knowledge of the authors, this is the first CMOS mixer operating at millimeter-wave frequencies. The achieved conversion loss is even lower than for passive MMIC mixers using leading edge III/V technologies, showing the excellent suitability of digital CMOS technology for analog circuits at millimeter-wave frequencies. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Efficient numerical analysis of vertical metallization in shielded microstrip circuits

    Publication Year: 2004 , Page(s): 1392 - 1398
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    This paper describes a method for the efficient numerical evaluation of modal series, which are involved in the full-wave analysis of shielded vertical metallizations in the framework of the integral-equation method-of-moments approach. Generally, the modal series converge very slowly, when treated in its original form, and it makes the approach inefficient from a practical point-of-view. The proposed method for effective series summation is based on Kummer's transformation augmented with two additional techniques, which greatly enhance its efficiency. The two techniques have been developed based on the results of an investigation into the analytical, as well as spectral properties of the modal series. The method has proven to be very effective, especially in the full-wave analysis of very short vertical metallizations, such as via-holes, since the analysis can be based only on evaluation of the static part of the modal series. This feature makes the proposed method a good candidate for practical purposes, especially electromagnetic computer-aided-design tools. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Uniqueness problems in compact HBT models caused by thermal effects

    Publication Year: 2004 , Page(s): 1399 - 1403
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    This paper identifies possible numerical instabilities in compact HBT models, which are introduced by a physical meaningful self-heating description. Removing these possible sources of nonconvergence would deteriorate model accuracy since they originate from the device physics. It is, therefore, necessary to be aware of them during parameter extraction and circuit simulation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full-wave simulation of electromagnetic coupling effects in RF and mixed-signal ICs using a time-domain finite-element method

    Publication Year: 2004 , Page(s): 1404 - 1413
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB) |  | HTML iconHTML  

    This paper describes the computer simulation and modeling of distributed electromagnetic coupling effects in analog and mixed-signal integrated circuits. Distributed electromagnetic coupling effects include magnetic coupling of adjacent interconnects and/or planar spiral inductors, substrate coupling due to stray electric currents in a conductive substrate, and full-wave electromagnetic radiation. These coupling mechanisms are inclusively simulated by solving the full-wave Maxwell's equations using a three-dimensional (3-D) time-domain finite-element method. This simulation approach is quite general and can be used for circuit layouts that include isolation wells, guard rings, and 3-D metallic structures. A state-variable behavioral modeling procedure is used to construct simple linear models that mimic the distributed electromagnetic effects. These state-variable models can easily be incorporated into a VHDL-AMS simulation providing a means to include distributed electromagnetic effects into a circuit simulation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • K-band HBT and HEMT monolithic active phase shifters using vector sum method

    Publication Year: 2004 , Page(s): 1414 - 1424
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (560 KB) |  | HTML iconHTML  

    Two monolithic 3-bit active phase shifters using the vector sum method to K-band frequencies are reported in this paper. They are separately implemented using commercial 6-in GaAs HBT and high electron-mobility transistor (HEMT) monolithic-microwave integrated-circuit (MMIC) foundry processes. The MMIC HBT active phase shifter demonstrates an average gain of 8.87 dB and a maximum phase error of 11° at 18 GHz, while the HEMT phase shifter has 3.85-dB average measured gain with 11° maximum phase error at 20 GHz. The 20-GHz operation frequency of this HEMT MMIC is the highest among all the reported active phase shifters. The analysis for gain deviation and phase error of the active phase shifter using the vector sum method due to the individual variable gain amplifiers is also presented. The theoretical analysis can predict the measured minimum root-mean-square phase error 4.7° within 1° accuracy. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multifunctional microstrip transmission lines integrated with defected ground structure for RF front-end application

    Publication Year: 2004 , Page(s): 1425 - 1432
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB) |  | HTML iconHTML  

    This paper presents multifunctional microstrip transmission lines for designing a high port-isolation dual-frequency orthogonally polarized rectangular patch antenna and the antenna-integrated power amplifier. The proposed lines were realized through the integration of defected ground structures (DGSs) with conventional microstrip lines. A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.0-GHz excitation to the antenna and filtering out the 2.5-GHz receiving signal from the other port. High-order harmonic signal suppression of the power amplifier at the 2.5-GHz port was accomplished by the dumbbell-shaped DGS, thereby improving the efficiency of the amplifier. Measurements show an improvement of 20 dB in port isolation and 3% in power-added efficiency relative to an identical RF front-end, but integrated with a conventional patch antenna. An image impedance of the DGS-integrated microstrip lines can be controlled by the integrated DGS geometries. Relatively high-impedances lines, i.e., 150 and 100 Ω, are effectively implemented using microstrip lines with 75- and 50-Ω linewidths by incorporating the spiral- and dumbbell-shaped DGSs, respectively. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • CMOS low-noise amplifier design optimization techniques

    Publication Year: 2004 , Page(s): 1433 - 1442
    Cited by:  Papers (201)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (336 KB) |  | HTML iconHTML  

    This paper reviews and analyzes four reported low-noise amplifier (LNA) design techniques applied to the cascode topology based on CMOS technology: classical noise matching, simultaneous noise and input matching (SNIM), power-constrained noise optimization, and power-constrained simultaneous noise and input matching (PCSNIM) techniques. Very simple and insightful sets of noise parameter expressions are newly introduced for the SNIM and PCSNIM techniques. Based on the noise parameter equations, this paper provides clear understanding of the design principles, fundamental limitations, and advantages of the four reported LNA design techniques so that the designers can get the overall LNA design perspective. As a demonstration for the proposed design principle of the PCSNIM technique, a very low-power folded-cascode LNA is implemented based on 0.25-μm CMOS technology for 900-MHz Zigbee applications. Measurement results show the noise figure of 1.35 dB, power gain of 12 dB, and input third-order intermodulation product of -4dBm while dissipating 1.6 mA from a 1.25-V supply (0.7 mA for the input NMOS transistor only). The overall behavior of the implemented LNA shows good agreement with theoretical predictions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Implementation of first-order and second-order microwave differentiators

    Publication Year: 2004 , Page(s): 1443 - 1448
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    Simple and accurate formulations are employed to represent discrete-time infinite impulse response processes of both first- and second-order differentiators in the Z-domain. These formulations, in conjunction with the representations of transmission-line elements in the Z-domain, lead to transmission-line configurations that are eligible for wide-band microwave differentiators. Both the first- and second-order differentiators in microstrip circuits are implemented to verify this method. The experimental results are in good agreement with simulation values. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time-domain measurement of negative group delay in negative-refractive-index transmission-line metamaterials

    Publication Year: 2004 , Page(s): 1449 - 1454
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    We have simulated and constructed a one-dimensional metamaterial composed of a periodically loaded transmission line that exhibits both negative and positive group velocities in a band of effective negative index of refraction. The negative group velocity or, equivalently, the negative group delay, is demonstrated theoretically and experimentally in the time domain using modulated Gaussian pulses. Due to this negative delay, we can show an output pulse peak emerging from the loaded transmission line prior to the input peak entering the line, i.e., the output pulse precedes the input pulse. The fact that this surprising behavior does not violate the requirements of relativistic causality is illustrated with time-domain simulations, which show that discontinuities in the pulse waveforms are traveling at exactly the speed of light in vacuum. The pulse-reshaping mechanism underlying this behavior is also illustrated using time-domain simulations. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • DC boosting effect of active bias circuits and its optimization for class-AB InGaP-GaAs HBT power amplifiers

    Publication Year: 2004 , Page(s): 1455 - 1463
    Cited by:  Papers (15)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB) |  | HTML iconHTML  

    In this paper, dc sourcing capability (DSC), which is a very important consideration in design of active bias circuits for power amplifiers based on bipolar technologies, will be explained. The nonlinear effect of bias circuits on the dc sourcing characteristics has been analyzed with simplified circuits for power amplifiers using the Volterra series. The analysis shows that the second-order distortion generated by a bias buffer transistor can boost bias level of the RF transistor to compensate finite DSC available in the absence of this effect. The bias-level boosting due to RF injection can be optimized by tuning the value of a series resistor between the emitter of the buffer transistor and the base of the RF transistor. Amplifiers with different series resistors have been implemented and tested with an IS95-B code-division multiple-access signal at the cellular band (824-849 MHz). The experimental results verify that a circuit-level optimization for the second-order distortion of the bias circuits is very important for optimizing the linearity and efficiency of the HBT amplifiers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synthesis and design of novel in-line filters with one or two real transmission zeros

    Publication Year: 2004 , Page(s): 1464 - 1478
    Cited by:  Papers (26)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (576 KB) |  | HTML iconHTML  

    A direct synthesis and design technique of pseudoelliptic in-line filters with one or two real transmission zeros (TZs) is presented. It is shown that the phase of the reflection coefficient must be properly and uniquely determined for the synthesis to succeed. The TZs (attenuation poles) are brought about and independently controlled by dedicated resonators at the input and output. Each attenuation pole is located at the resonant frequency of its dedicated resonator. Frequency-independent reactances at the input and output are used to replace the phase shifts used in the extracted-pole technique. This novel approach is verified by several waveguide cavity filter designs. The analyzed characteristics of these filters, obtained with commercial full-wave computer-aided-design tools, agree very well with the synthesis results. A third-order filter with one TZ above the passband is designed, fabricated, and measured. Excellent agreement between the measurement and simulation is obtained. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A full duplex capable retrodirective array system for high-speed beam tracking and pointing applications

    Publication Year: 2004 , Page(s): 1479 - 1489
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB) |  | HTML iconHTML  

    A retrodirective array capable of full duplex communication is presented. The system is based purely on analog circuits for all signal-processing tasks including target tracking, beam pointing, and carrier recovery. Two types of receiver architectures are used, i.e., AM diode detectors for near-omni directional coverage and a digital beamforming receiver to enhance signal-to-interference ratio. This paper also discusses this technology in the context of development of a radar target/communication device, which is intended to both facilitate radar imaging and establish a self-tracking communication link between the ground terminal and mobile radar station. Demonstration of 10-Mb/s data receiving and transmitting functions are presented along with its automatic beam-steering ability and radiation patterns, as well as details about each major circuit component used in the array. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transmission-line modeling using unstructured triangular meshes

    Publication Year: 2004 , Page(s): 1490 - 1497
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    Transmission-line modeling (TLM) is an established numerical simulation method for electromagnetics that has been employed in a wide variety of application areas. To date, TLM has been formulated primarily for structured (usually Cartesian) meshes. This paper presents and illustrates the application of a new TLM algorithm suitable for use with unstructured two-dimensional meshes based upon triangular elements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel wide-band noise-parameter measurement method and its cryogenic application

    Publication Year: 2004 , Page(s): 1498 - 1507
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB) |  | HTML iconHTML  

    The concept of using a long mismatched transmission line to measure noise parameters has been known for some time. However, it has been limited to narrow-bandwidth applications, and a wide-band extension has never been reported. In order to measure the cryogenic noise parameters of a wide-band low-noise amplifier (LNA), a wide-band frequency-variation method is proposed. In this method, the four noise parameters at each frequency are derived numerically from a set of matched and mismatched noise temperatures measured within a surrounding frequency-sampling window. By scanning this frequency-sampling window, noise parameters over a wide frequency range can be obtained. Since this approach can be easily incorporated into existing noise measurement systems, a tuner is not required, and the technique can be applied to a cryogenic amplifier. This paper details the theory, implementation, and verification of this new method. The measured noise parameters of a cryogenic wide-band LNA are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rigorous modal analysis of structures containing inhomogeneous dielectric cylinders

    Publication Year: 2004 , Page(s): 1508 - 1516
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB) |  | HTML iconHTML  

    The orthogonal expansion method and modified iterative scattering procedure is proposed to analyze structures containing asymmetrically located, partial-height, or multilayered inhomogeneous dielectric posts. The analysis is based on a novel concept called the hybrid impedance matrix (HIM), which describes the relation between the total scattered electric and magnetic fields obtained from all posts. As a result, the HIM can be easily applied to match it with other known incident fields and finds applications in closed (waveguide junctions, resonators) and open structures (posts in free space for plane-wave excitation). Additionally, a procedure for constructing eigenmode functions describing field components in the inhomogeneous dielectric cylinders is presented. The proposed method has been extensively verified for a rectangular waveguide junction by a finite-difference time-domain software package, as well as our own measurements and, in both cases, very good agreement can be observed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broad-band microstrip-to-CPW transition via frequency-dependent electromagnetic coupling

    Publication Year: 2004 , Page(s): 1517 - 1522
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (328 KB) |  | HTML iconHTML  

    An improved broad-band microstrip-to-coplanar-waveguide (CPW) transition is developed on a basis of the frequency-dependence characteristic of an electromagnetic surface-to-surface coupling. A self-calibrated method of moments is extended to model this unbounded two-port discontinuity with the two dissimilar microstrip/CPW feeding lines. Numerical results are provided to demonstrate its frequency response of transmission under varied strip/slot dimensions and further exhibit its attractive ultra-broad-band transmission with low radiation loss. Next, the back-to-back transition circuits with the two different lengths are fabricated and measured to deembed in experiment the S-parameters of two single-transition structures. Predicted and measured results show good agreement with the return loss less than -10dB over the frequency of 3.2-11.2 GHz. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the noise properties of injection-locked oscillators

    Publication Year: 2004 , Page(s): 1523 - 1537
    Cited by:  Papers (20)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1080 KB) |  | HTML iconHTML  

    This paper presents a detailed study of noise properties of injection-locked oscillators. We describe an elaborate numerical model, which offers the accuracy of the best known analytical models when analyzing a single oscillator. Those analytical models do not use perturbation theory since the Wiener nature of the noise renders small-signal analysis inadequate. Our model can be extended to any locked oscillators configuration while keeping the same accuracy. This was not done to date with any of the rigorous analytical models. We analyze unidirectionally and bidirectionally coupled oscillators operating in fundamental or harmonic-locking modes. Harmonic locking is analyzed in detail and the indirect locking process underlying it is identified while the noise of all harmonics is explored in detail. The results of the model are confirmed in a series of experiments employing electrooptic implementations with a photo-HBT-based oscillator. The various configurations we analyze and demonstrate experimentally represent important applications such as spectral purity enhancement, timing extraction, and low-jitter optical pulse generation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An all-solid-state broad-band frequency multiplier chain at 1500 GHz

    Publication Year: 2004 , Page(s): 1538 - 1547
    Cited by:  Papers (70)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB) |  | HTML iconHTML  

    We report the results of a high-performance all-solid-state broad-band frequency multiplier chain at 1500 GHz, which uses four cascaded planar Schottky-barrier varactor doublers. The multipliers are driven by monolithic-microwave integrated-circuit-based high electron-mobility transistor power amplifiers around 95 GHz with 100-150 mW of pump power. The design incorporates balanced doublers utilizing novel substrateless and membrane device fabrication technologies, achieving low-loss broad-band multipliers working in the terahertz range. For a drive power of approximately 100 mW in the 88-99-GHz range, the doublers achieved room-temperature peak efficiencies of approximately 30% at the 190-GHz stage, 20% at 375 GHz, 9% at 750 GHz, and 4% at the 1500-GHz stage. When the chain was cooled to 120 K, approximately 40 μW of peak output power was measured for 100 mW of input pump power. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Miniature high-Q double-spiral slot-line resonator filters

    Publication Year: 2004 , Page(s): 1548 - 1557
    Cited by:  Papers (17)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB) |  | HTML iconHTML  

    A new class of low insertion-loss miniaturized filters using slot-line resonators is proposed. Miniaturization is achieved by terminating the slot line with a double-spiral inductive termination at both ends. Using this miniaturized resonator, both positive and negative couplings may be realized, and therefore, both standard coupled-line and cross-coupled quasi-elliptic filters are realizable. The unloaded Q of these slot-line filters is considerably higher than that of miniaturized microstrip filters of comparable dimensions due to the inherent higher Q of the slot line. To demonstrate the validity of the design procedures and the performance characteristics, two different types of filters were fabricated and tested. One is a four-pole Chebyshev filter and the other is a quasi-elliptic filter where, in each case, the full-wave simulations show very good agreement with measurements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of a phased-array driver with controllable phases and magnitudes

    Publication Year: 2004 , Page(s): 1558 - 1564
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    This paper describes the design of a phased-array driver module that provides controllable phases and magnitudes. A single driver is designed and its architecture is applied to the design of a 16-channel computer-controlled 1-GHz phased-array driver. This device is capable of varying and controlling the magnitudes and phases of its output RF signals and may be used to feed a 4×4 phased-array antenna. The outputs are computer controlled and accuracy is maintained by comparing feedback phase and magnitude values with pre-calibrated ones. Any desired relative phase shift may be obtained at the outputs with up to 30 dB of magnitude variation, having an accuracy of ±5° and ±0.5dB, respectively. This architecture may be applied to the design of larger arrays. Its feedback control techniques may be used to improve beam-steering accuracy. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dominique Schreurs
Dominique.Schreurs@ieee.org

Editor-in-Chief
Jenshan Lin
jenshan@ieee.org