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Microwave and Wireless Components Letters, IEEE

Issue 7 • Date July 2012

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  • Table of Contents

    Publication Year: 2012 , Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2012 , Page(s): C2
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  • A Half-Mode Substrate Integrated Waveguide Ring for Two-Way Power Division of Balanced Circuit

    Publication Year: 2012 , Page(s): 333 - 335
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB) |  | HTML iconHTML  

    A new balanced-to-balanced Gysel power divider (PD) is proposed for high-power applications, based on a half-mode substrate integrated waveguide (SIW) ring. The ring has a circumference of 2.5 λg, and one port is used for good isolation. The balanced-to-balanced component is easily designed by converting its single-ended counterpart. With the equivalent impedance defined by voltage and current of half-mode SIW, the initial geometry is quickly obtained. Good performance is achieved with our proposed PD, which has been demonstrated by its simulated and measured mixed-mode S-parameters. View full abstract»

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  • A Half-Mode Substrate-Integrated-Waveguide Tunable Filter Using Packaged RF MEMS Switches

    Publication Year: 2012 , Page(s): 336 - 338
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (861 KB) |  | HTML iconHTML  

    A two-pole, half-mode substrate-integrated-waveguide (HMSIW) RF MEMS tunable filter with 28% tuning range around 1.4 GHz is presented. The filter occupies a total area of λg × 0.7λg @ 1.4 GHz and exhibits an insertion loss of 1.2-3.4 dB, return loss better than 11 dB and quality factor of 75-140 for all tuning states, while having excellent linearity. The filter maintains a constant absolute 1 dB bandwidth of 85 ±10 MHz over the filter tuning range. Circuit models for the tunable HMSIW resonator and a methodology for systematic filter design are also described in detail. View full abstract»

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  • High-Power Low-Pass Harmonic Waveguide Filter With {\rm TE}_{{\rm n}0} -Mode Suppression

    Publication Year: 2012 , Page(s): 339 - 341
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (747 KB) |  | HTML iconHTML  

    In this letter, a new method for the design of high-power low-pass harmonic filters in rectangular waveguide technology is proposed. Based on a 2-D arrangement of bandstop elements of sinusoidal profile, a filter with a wide spurious-free frequency response (up to the third harmonic) for the fundamental TE10 mode, as well as higher-order TEn0-mode suppression, is achieved. Compared to the classical waffle-iron solution, the novel proposal has a highly increased power-handling capability for the same frequency specifications. View full abstract»

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  • A Branched Reflector Technique to Reduce Crosstalk Between Slot-Crossing Signal Lines

    Publication Year: 2012 , Page(s): 342 - 344
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (681 KB) |  | HTML iconHTML  

    A branched reflector technique is proposed to reduce the crosstalk between the signal lines crossing common slotted reference plane. An equivalent circuit model based on lossless transmission lines is applied to characterize the coupling mechanism. The design concept of this approach is well explained and its design method is also provided by utilizing the bounce diagram with multiple discontinuities. According to the experimental results, the reduction of the peak crosstalk is about 51% and it is close to the prediction from the estimated formula. The peak-to-peak crosstalk in our interested region can also be reduced by 68%. The proposed method provides a low-cost and effective solution to suppress the undesirable crosstalk between slot-crossing signal lines. View full abstract»

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  • High-Quality Integrated Inductors Based on Multilayered Meta-Conductors

    Publication Year: 2012 , Page(s): 345 - 347
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (375 KB) |  | HTML iconHTML  

    We demonstrate high-quality integrated inductors built from a multilayer of alternating copper and ferromagnetic films. The multilayer acts as a meta-conductor whose effective permeability becomes nearly zero at its ferromagnetic anti-resonance frequency. This leads to a suppression of the skin effect and a significant increase in the quality factor of the device. Experiments show an up to 86% increase in quality factor compared to conventional copper-based spiral inductors at high frequencies. View full abstract»

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  • Wideband Microstrip Bandpass Filter Based on Quadruple Mode Ring Resonator

    Publication Year: 2012 , Page(s): 348 - 350
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (637 KB) |  | HTML iconHTML  

    A novel wideband microstrip band-pass filter is presented in this letter based on a quadruple-mode ring resonator, which is developed by introducing a stepped-impedance one-wavelength ring resonator (SORR) into a stepped-impedance half-wavelength resonator (SHR). In order to suppress the harmonic responses of the filter for a wide stop-band, two band-stop sections with asymmetrical -type structure are introduced. A prototype filter having 49.3% of 1 dB and 57.9% of 3 dB fractional bandwidth is fabricated with advantages of high selectivity and high out-of-band rejection. In the pass-band, the return loss is larger than 18.8 dB and at the centre frequency insertion loss is 0.6 dB. The experiments are in good agreement with the simulations. View full abstract»

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  • Compact UWB Bandpass Filter With a Notched Band Using Radial Stub Loaded Resonator

    Publication Year: 2012 , Page(s): 351 - 353
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (740 KB) |  | HTML iconHTML  

    In this letter, a novel compact ultra-wideband (UWB) microstrip bandpass filter (BPF) with a notched band is presented by using the proposed radial stub loaded resonator (RSLR). The RSLR, on the one hand, is able to control two tunable transmission zeros separately and on the other hand, has the ability to provide a notched band. In addition, the vertical dimension of the UWB BPF can be significantly reduced by using RSLR, as compared with the UWB BPF based on the conventional stub-loaded resonator (SISLR). For validation, two UWB BPFs, one without the notched band and the other with a notched band at 8.0 GHz for rejecting satellite-communication signal, are developed and fabricated. Measured results show two fabricated filters have the merits of low insertion losses, sharp rejections and flat group delays. Moreover, two filters exhibit the simple topologies and compact sizes. View full abstract»

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  • Miniaturized Diplexer Using Synthesized Microstrip Lines With Series LC Tanks

    Publication Year: 2012 , Page(s): 354 - 356
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (880 KB) |  | HTML iconHTML  

    By utilizing two synthesized microstrip lines, a new miniaturized diplexer is proposed and validated in this letter. The synthesized line, formed by series LC tanks and meander line inductors, behaves like a conventional 50 microstrip line in one frequency band but is equivalent to an open circuit in the other band. This property dramatically improves the electrical performances of the diplexer while still keeping a very compact circuit size. The footprint of the diplexer is merely 0.083 × 0.049λ02. At the center frequencies, the transmission losses are <; -0.5 dB, while the reflection coefficients are <; -27 dB. The fractional bandwidths are 16% and 34%, respectively, in the two bands. View full abstract»

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  • Design of a Compact Microstrip Quint-Band Filter Based on the Tri-Mode Stub-Loaded Stepped-Impedance Resonators

    Publication Year: 2012 , Page(s): 357 - 359
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (620 KB) |  | HTML iconHTML  

    A simple and efficient method has been presented to design multi-band microstrip bandpass filters (BPFs) without a significant increase in circuit size. By utilizing multiple coupling paths, all passbands can then be fully controlled and, thus, the design is flexible so as to independently realize different bands. In addition, by adjusting the structural parameters of the proposed trimode stub-load stepped-impedance resonator, its first three resonant frequencies can be controlled. Thus, it can be utilized to implement a third-order BPF with a transmission zero at the upper side of the passband when these resonant frequencies are suitably assigned. For our demonstration, a compact quint-band BPF formed by only five tri-mode resonators has been designed and fabricated. It is shown that the quint-band filter occupies an extremely small area, i.e., 0.34 λ0 by 0.03 λ0 (0.52 λgby 0.045 λg). Good agreement is also achieved between simulation and measurement. View full abstract»

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  • Optically Transparent and Flexible Graphene Reciprocal and Nonreciprocal Microwave Planar Components

    Publication Year: 2012 , Page(s): 360 - 362
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (578 KB) |  | HTML iconHTML  

    The sheet resistance of graphene has been recently reduced below the level of previous optically transparent conductive materials, making graphene, with its additional advantage of mechanical flexibility, the best candidate for future transparent electronics. We investigate here the viability of microwave planar components using graphene sheets as conductors towards optically transparent and flexible radio systems. Specifically, we study the waveguiding and nonreciprocal properties of such components, through the arbitrary example of a coplanar waveguide (CPW) structure, using the 2-D finite difference frequency domain (FDFD) technique. It is shown that reciprocal graphene-based components of acceptably low loss levels are achievable using graphene sheets of the lowest available resistivity, while nonreciprocal components with graphene conductors still exhibit prohibitive loss due to a fundamental trade-off between nonreciprocity and carrier density in graphene. View full abstract»

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  • Uni-Travelling-Carrier Photodiode Module Generating 300 GHz Power Greater Than 1 mW

    Publication Year: 2012 , Page(s): 363 - 365
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (433 KB) |  | HTML iconHTML  

    In this letter, we demonstrate over 1 mW power generation at 300 GHz with a uni-travelling-carrier photodiode (UTC-PD) packaged in a WR-3 waveguide module. To increase the maximum power, two identical UTC-PDs were monolithically integrated along with a T-junction to combine the power from the two PDs. The UTC-PD module exhibited peak saturated output power of approximately 1.2 mW at 300 GHz with photocurrent of around 20 mA per PD and bias voltage of -3.9 V. In addition, 3 and 10 dB bandwidths were measured to be around 70 GHz or 23% and over 150 GHz or 50%, respectively. View full abstract»

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  • A Broadband, Low Noise, Integrated 340 GHz Schottky Diode Receiver

    Publication Year: 2012 , Page(s): 366 - 368
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB) |  | HTML iconHTML  

    A 340 GHz subharmonic Schottky diode mixer and a multioctave (3-16 GHz) custom low noise amplifier (LNA) have been integrated to form a compact receiver front-end module, exhibiting ultra low noise with an exceptional flat response and broadband instantaneous frequency coverage. At room temperature, a receiver noise temperature of 870 K is measured at an LO drive of 1.2 mW at 170 GHz. The total dc power consumption of the LNA is below 120 mW. Measurements are in good agreement with simulations taking the mixer and LNA mismatch interaction into account. View full abstract»

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  • A Simple DC to 110 GHz MMIC True Time Delay Line

    Publication Year: 2012 , Page(s): 369 - 371
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (615 KB) |  | HTML iconHTML  

    A simple miniaturized ultra-wideband true time delay line (TTD) is demonstrated using Indium Phosphide (InP) MMIC technology. An unprecedented bandwidth from close to dc to beyond 110 GHz is measured. The TTD has around 200 ps delay, a maximum insertion loss of only ~4.5 dB at 110 GHz, and better than 15 dB return loss across the majority of the band. This configuration significantly reduces the chip size, weight and cost. It demonstrates that wideband large time delay line is viable for planar IC implementation. To the authors' knowledge, this is the widest bandwidth ever reported for MMIC true time delay lines with relatively large time delay and compact size. View full abstract»

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  • A 60 GHz Cascode Variable-Gain Low-Noise Amplifier With Phase Compensation in a 0.13 \mu{\rm m} CMOS Technology

    Publication Year: 2012 , Page(s): 372 - 374
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB) |  | HTML iconHTML  

    A 60 GHz variable-gain low-noise amplifier (LNA) with varactor-based phase compensation is developed using a 0.13 CMOS process. Based on the analysis of the phase variation during the gain control in the cascode-FET unit cell, a simple varactor-based phase compensation method is proposed. A linear bias control scheme for the gate of the common-source FET and the cathode of nMOS varactor at the gate of common-gate FET results in the phase compensation between the two FET's in the cascode cell. The gain control range is also expanded with the proposed approach. The fabricated variable-gain LNA (VG-LNA) shows a small phase variation of 5 ^ over a gain control range of 13 dB. View full abstract»

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  • A Low-Power Third-Harmonic Self-Oscillating Mixer Using Multi-Harmonic Load

    Publication Year: 2012 , Page(s): 375 - 377
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (397 KB) |  | HTML iconHTML  

    A novel design of a third-harmonic self-oscillating mixer (SOM) based on a nonlinear optimization technique, namely multi-harmonic load, has been designed. Power consumption is reduced by terminating harmonic properly, and conversion gain is optimized in the form of harmonic termination networks at dc, RF, and LO frequency, and its harmonics. In this way, a novel SOM circuit at an RF frequency of 5.79 GHz has been designed and fabricated yielding an excellent conversion gain of +11.5 dB. Gate and drain voltage supplies are -1.18V and +1.5 V, respectively and dc power consumption is about 9 mW. View full abstract»

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  • Reconstruction of Metallic Inclusions Inside Dielectric Targets by Means of a Microwave Tomographic System

    Publication Year: 2012 , Page(s): 378 - 380
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (506 KB) |  | HTML iconHTML  

    Experimental results concerning the inspection at microwave frequencies of wood material with metallic inclusions are reported. They have been obtained by inverting samples of the scattered electromagnetic field collected by a prototype of an imaging system. The system is able to acquire multi-illumination multiview data in a tomographic arrangement. The retrieved maps of the dielectric permittivity and electric conductivity of the cross sections of unknown targets are obtained by applying the distorted-wave Born approximation to the electric field integral equation governing the scattering phenomenon. View full abstract»

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  • Comment on “Compact, High-Q, and Low-Current Dissipation CMOS Differential Active Inductor”

    Publication Year: 2012 , Page(s): 381 - 382
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    In a recent letter [ibid., vol. 18, no. 10, pp. 683??685, Oct. 2008], C.L. Ler et al. present a CMOS differential active inductor (DAI) based on the single transistor source degenerated architecture proposed by those authors in ibid., vol. 44, no. 3, pp. 196??197, Jan. 2008. The aim of this Comment is to reveal the general configurations and circuit equivalences which the results in the Oct 2008 paper are based on and to prove that the active inductor does not fit to the term gyrator mentioned in that paper. In this regard, two observations are proposed. The first one is that both circuits can be derived from given general topologies using capacitors for Z(s). The second observation is that the series connection shown here in Fig. 2(a) is equivalent to the series-parallel circuit in Fig. 2(b) which for Z(s) = 1/sC gives the results reported in the two papers referenced. View full abstract»

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  • Comments on "A modified gysel power divider of arbitrary power ratio and real terminated impedances"

    Publication Year: 2012 , Page(s): 382 - 383
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (135 KB)  

    In the above-named letter [ibid., vol. 21, no. 11, pp. 601??603, Nov. 2011], the authors presented a Gysel divider with arbitrary power division ratio and termination impedances. In this letter, it is shown that for a dual-band Gysel power divider with arbitrary power division ratio and termination impedances can be derived as a special case of the dual-band Gysel power divider proposed by Z. Sun, et al., "Design of unequal dualband Gysel power divider with arbitrary termination resistance," IEEE Trans. Microw. Theory Tech, vol. 59, no. 8, pp. 1955??1962, Aug. 2011. A more generalized result is presented with more potential for the arbitrary power division ratio and termination impedances. View full abstract»

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  • Terahertz spectroscopic techniques and applications

    Publication Year: 2012 , Page(s): 384
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    Freely Available from IEEE
  • IEEE Microwave and Wireless Components Letters Reviewers List

    Publication Year: 2012 , Page(s): C3
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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.

Full Aims & Scope