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Microwave and Wireless Components Letters, IEEE

Issue 7 • Date July 2004

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  • Table of contents

    Page(s): c1
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  • IEEE Microwave and Wireless Components Letters publication information

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  • A W-band subharmonically pumped monolithic GaAs-based HEMT gate mixer

    Page(s): 313 - 315
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (161 KB) |  | HTML iconHTML  

    A W-band high electron mobility transistor (HEMT) subharmonically pumped (SHP) gate mixer is designed with fixed LO frequency operation. it is fabricated on a 4-mil substrate using 0.15-μm GaAs pHEMT monolithic microwave integrated circuit (MMIC) process. the on-wafer measurement results show that the best conversion loss is about 4.7 dB in the W-band, as a 11-dbm 42-GHz low observable (LO) signal is pumped. To our knowledge, this is the first result on low conversion-loss W-band MMIC SHP HEMT gate mixer. View full abstract»

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  • W-band direct detection circuit performance with Sb-heterostructure diodes

    Page(s): 316 - 318
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    W-band direct detection circuits have been designed and fabricated for use in a passive millimeter wave camera. The circuits are based on the recently developed Sb-heterostructure diode. We measure record voltage responsivities in test circuits, up to 8,000 mV/mW from 75 to 93 GHz, with input power from -50 to -30 dBm. Performance was similar in an actual camera frequency processor board with 128 tuned channels. 72% of detectors showed responsivity at or above 6,000 mV/mW and 3% of channels were above 10,000 mV/mW. Since tens of thousands of Sb-heterostructure diodes can be reproducibly and inexpensively fabricated, this demonstrates for the first time the feasibility of large-scale detector arrays utilizing zero bias direct detection circuitry. View full abstract»

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  • 5-6 GHz SiGe active I/Q subharmonic mixers with power supply noise effect characterization

    Page(s): 319 - 321
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB) |  | HTML iconHTML  

    A 5-6 GHz active subharmonic I/Q mixer pair has been designed and fabricated for use in direct conversion receivers for the Unlicensed National Information Infrastructure (U-NII) bands. The design includes I and Q subharmonic mixers and an LO conditioning chain. All circuits are fully differential and are designed to operate from a 3.3 V supply. Each mixer consumes 5 mA of current. A conversion gain of 6 dB, an IIP2 of +29 dBm and an input 1-dB compression point of -5.4 dBm were measured. The 90° phase balance between the I and Q mixer IF outputs was investigated in the presence of injected digital switching noise on the power supply lines; 90° balance was maintained over a wide range of switching waveform frequencies and amplitudes. View full abstract»

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  • Numerical and experimental analysis of nonradiative dielectric guide modulator and mixer at Ka band

    Page(s): 322 - 324
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (192 KB) |  | HTML iconHTML  

    This letter describes the numerical analysis of an on/off modulator and a single-ended mixer in nonradiative dielectric (NRD) guide configuration at Ka band. Currently, only experimental results are available for such structures. A shunt mounted diode switch in NRD guide configuration is analyzed using the finite element method (FEM) in conjunction with linear circuit simulation. A novel mixer is similarly analyzed using FEM and harmonic balance analysis. The results obtained from numerical analysis are compared with measured results. It is demonstrated that some counter-intuitive experimental results can be explained through numerical analysis. View full abstract»

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  • Linearization of receivers using envelope signal injection

    Page(s): 325 - 327
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    This paper presents a new linearization method for receivers employing envelope signal injection. In this technique, the third-order intermodulation distortion (IM3), at the output of a mixer in IF band, is cancelled by injecting the envelope of the RF input signal to both the low noise amplifier (LNA) and the mixer. By properly adjusting the amplitude and polarity of the injected envelope signal, up to 40-dB improvement of the IM3 and 11-dB improvement of the IM5 is obtained in a two tone test with 100-kHz separation at 1.9GHz. This method operates very well over a wide range of power up to the 1-dB compression point of the receiver. The noise performance of the receiver under this linearization technique is also investigated. The noise floor at the output of the receiver is increased by 0.8 dB only when the system is optimized for linearity. View full abstract»

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  • Frequency-domain principle of pattern multiplication for array-fed reflector or lens antennas

    Page(s): 328 - 330
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    In this letter, array-fed reflector or lens antennas are proven by using Fourier analysis methods to follow a kind of frequency-domain principle of pattern multiplication, which states that the spectrum of the composite field of such an antenna is the product of the spectrum of the far field of the individual spot beam and that of the excitation coefficient sequence. This principle will provide a useful and efficient tool not only for determining the optimum excitations but also for predicting the antenna performance. View full abstract»

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  • An alternative approach to FD-TD analysis of magnetized ferrites

    Page(s): 331 - 333
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (160 KB) |  | HTML iconHTML  

    This paper presents a new approach to the finite difference-time domain (FD-TD) analysis of magnetized ferrites. An equivalent lumped circuit of an FD-TD cell filled with such a medium is developed. Then the lumped circuit is used to propose a new FD-TD algorithm. This algorithm is verified on canonical examples and is shown to be simple, accurate, robust and computationally more effective than the previously published approaches. View full abstract»

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  • On the reflection from Cummer's nearly perfectly matched layer

    Page(s): 334 - 336
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    This letter shows that the nearly perfectly matched layer (NPML) recently introduced by Cummer is a true reflectionless absorbing boundary condition in continuous space, and is as effective as previous implementations of PMLs in discretized finite difference space. View full abstract»

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  • A novel power planes with low radiation and broadband suppression of ground bounce noise using photonic bandgap structures

    Page(s): 337 - 339
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    A novel power/ground planes design for eliminating the ground bounce noise (GBN) in high-speed digital circuits is proposed by using low-period photonic bandgap (PBG) structure. Keeping solid for the ground plane and designing low-period PBG pattern on the power plane, the proposed structure omni-directionally behaves highly efficient suppression of GBN (over 50 dB) within broadband frequency range from 1 GHz to 4 GHz. Although the power plane has low-period perforation, the proposed structure still performs with relatively low radiation within the stopband compared with the solid power/ground planes. The low radiation and high suppression of the GBN for the proposed structure are checked both experimentally and numerically. Good consistency is seen. View full abstract»

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  • Phase-agile branch-line couplers using metamaterial lines

    Page(s): 340 - 342
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    Two branch-line couplers are introduced that utilize a combination of regular microstrip (MS) and negative-refractive-index (NRI) lines. Interesting phase compensation (0° phase shift) at the output port and a choice of ±90° phase shift at the through port, with respect to the input, are possible. On the other hand, one of the dimensions of the coupler is significantly reduced, compared to a corresponding conventional branch-line coupler, but without any bandwidth degradation. View full abstract»

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  • Computational and experimental study of a microwave electromagnetic bandgap structure with waveguiding defect for potential use as a bandpass wireless interconnect

    Page(s): 343 - 345
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB) |  | HTML iconHTML  

    As clock rates continue to rise, problems with signal integrity, cross-coupling, and radiation may render impractical the baseband metallic interconnects presently used in computers. A potential means to address this problem is to use bandpass wireless interconnects operating at millimeter-wave center frequencies. We have conducted experimental and finite-difference time-domain (FDTD) computational studies scaled to a 10 GHz center frequency of single-row and double-row waveguiding defects within an electromagnetic bandgap structure. Our initial experimental results scaled to 10 GHz have verified the feasibility of achieving an approximately 80% bandwidth with excellent stopband, gain flatness, and matching characteristics. When scaled to millimeter-wave center frequencies above 300 GHz, this technology appears feasible of supporting data rates in the hundreds of Gb/s. View full abstract»

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  • Pseudo-elliptic microstrip line filters with zero-shifting properties

    Page(s): 346 - 348
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (128 KB) |  | HTML iconHTML  

    The paper presents a new design of pseudo-elliptic microstrip line filters. These filters employ a coupling scheme which allows shifting of transmission zeros from one side of the passband to the other by only changing the resonant frequencies of the resonators. To demonstrate the performance of these filters, a fourth-order bandpass filter with one transmission zero in the upper stopband is first designed. A second filter with a transmission zero in the lower stopband is then designed by simply adjusting the lengths of the resonators followed by minor optimization to account for the fact that the resonant frequencies can not be changed without slightly affecting the coupling coefficients in the used layout. Measured and simulated results are presented. View full abstract»

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  • A fully automatic domain partitioning technique for the efficient circuit-level simulation of large nonlinear microwave subsystems

    Page(s): 349 - 351
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB) |  | HTML iconHTML  

    The domain partitioning concept is applied to the circuit-level simulation of complex nonlinear microwave subsystems of arbitrary topology, such as entire front-ends. The subsystem is described as a whole at the data entry level, but is automatically split into the interconnection of a near-optimal number of nonlinear blocks at run time. Nonlinear analysis is based on a scattering-matrix version of Krylov-subspace harmonic balance (HB) in order to avoid Y-matrix singularities in the decomposition process. This leads to high numerical efficiency and allows an excellent tradeoff between the piecewise and nodal HB approaches to be established. View full abstract»

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  • An accurate nonlinear MOSFET model for intermodulation distortion analysis

    Page(s): 352 - 354
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    A compact charge-conservative nonlinear equivalent circuit model for metal-oxide-semiconductor field-effect transistors is comprehensively verified in terms of its ability to predict intermodulation distortion. The model is valid for the dc, small-signal, and large-signal simulation of high frequency circuits over a wide range of bias conditions and is globally fully continuous. Simulations made using the model, following parameter extraction, are validated by comparisons with experimental data. Using harmonic balance methods, intermodulation distortion for weak and large-signal two-tone tests and more realistic wide-band code-division-multiple-access signals is successfully predicted for a range of bias points. View full abstract»

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  • Enhanced transmission through two-period arrays of subwavelength holes

    Page(s): 355 - 357
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (232 KB) |  | HTML iconHTML  

    A two-period array of subwavelength holes in a perfect electrically conducting plate permits enhanced transmission of incident plane waves with wavenumbers near those of leaky waves supported by the array. A simple periodic impedance sheet model explains this phenomenon and provides an approximate expression for the transmission peak location. Transmission through thin perforated plates is studied using a full-wave solver to verify model-theoretic observations. Transmission coefficient peak splitting and narrowing phenomena, associated with thick perforated plates, are explored. View full abstract»

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  • Novel difference-frequency dual-signal injection method for CMOS mixer linearization

    Page(s): 358 - 360
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB) |  | HTML iconHTML  

    This paper presents the application of dual-signal injection technique to the reduction of intermodulation distortion (IMD) level in double-balanced mixer. In this method, "difference-frequency" signal components are optimally fed to the mixer through the biasing circuitry for IMD cancellation. For comparison purposes, the measured performance of a 900-MHz complementary metal oxide semiconductor (CMOS) mixer based upon both single and dual injection approaches is shown. View full abstract»

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  • Comparative evaluation of DSP techniques coupled with electromagnetic time-domain simulators for the efficient modeling and design of highly resonant RF-MEMS structures

    Page(s): 361 - 363
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    Four digital signal processing (DSP)-based digital predictors [Prony's, covariance, forward-backward (FB), matrix pencil (MP)], that are commonly used to enhance the time-domain modeling and design of highly complex RF MEMS structures, are evaluated in terms of computational efficiency and accuracy as a function of the model order, the decimating factor, and the size of sample train. For a benchmarking case of an RF MEMS tuner, it is found that while covariance method has the best performance in terms of accuracy, MP method confers robustness to computational economies (less numerical effort) and saves more CPU time with a smaller model order that can be selected by easy and efficient criteria. View full abstract»

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  • A 5-6-GHz polyphase filter with tunable I/Q phase balance

    Page(s): 364 - 366
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    A tunable polyphase filter with integrated input and output buffers was designed and fabricated in a 0.4 μm SiGe BiCMOS technology with a 5-6-GHz bandwidth. Series tunable capacitors (varactors) provide phase tunability for the differential quadrature outputs of the polyphase filter. The tunable phase can be used to improve image rejection in Weaver or Hartley architectures, or mitigate in-phase and quadrature (I/Q) phase error in direct conversion or low-IF receivers. The die area of the fabricated circuit with pads is 920 μm× 755 μm. Based on measurements, approximately 15/spl deg/ of I/Q phase imbalance can be tuned out using the fabricated polyphase filter, proving the concept of tunable phase. To the authors' knowledge, this is the first reported tunable I/Q balance polyphase network. View full abstract»

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  • Advertisement - 2004 IEEE Membership Application

    Page(s): 367 - 368
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  • IEEE Microwave and Wireless Components Letters Information for authors

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Aims & Scope

The IEEE Microwave and Wireless Components Letters (MWCL) publishes three page papers that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals.

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