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Microwave and Wireless Components Letters, IEEE

Issue 3 • Date March 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 Pseudo-Elliptical Response Filter at W-Band Fabricated With Thick SU-8 Photo-Resist Technology

    Publication Year: 2012 , Page(s): 105 - 107
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB) |  | HTML iconHTML  

    The design and experimental validation of a pseudo-elliptical response filter at W-Band is presented. A micromachining technique based on the thick SU-8 photo-resist is used to construct the filter. The optimized structure is specially well-suited for the implementation of filters with transmission zeros by means of micromachining techniques, since the extracted poles are implemented by simple stubs without irises. Furthermore, a novel topology based on the use of only three SU-8 layers is presented. This new topology, which includes a novel optimized input/output routing, can be potentially used for the design of high-performance devices with a fast and low-cost production. A fourth-order filter with two transmission zeros has been fabricated (bandwidth 5%), presenting 1.2 dB of insertion loss. This level of loss is equivalent to the actual state-of-art for micromachined filters at W-band, in spite of the reduced height and the split block in the H-plane used in the presented design. View full abstract»

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  • A Grating-Based Circular Polarization Duplexer for Submillimeter-Wave Transceivers

    Publication Year: 2012 , Page(s): 108 - 110
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB) |  | HTML iconHTML  

    A quasioptical duplexer based on a metallic grating polarizer has been designed and demonstrated in a submillimeter-wave imaging radar system. The grating converts between linear and circular polarization with low loss and high isolation, and it is simple to manufacture by cutting grooves into a scanning subreflector. The grating profile and period were optimized to provide good polarizing efficiency over the radar's 4.5% bandwidth of 660-690 GHz, with two-way mismatch loss simulated to be better than 0.1 dB over an 8% bandwidth. Similarly negligible loss is also predicted for grating rotations of ±3°, which span the radar's field of view. The circular polarization grating duplexer is shown to improve the signal-to-noise ratio by 4.5 dB compared to a beam splitter. View full abstract»

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  • Design of Dual-Band Interdigital Bandpass Filters Using Both Series and Shunt Resonators

    Publication Year: 2012 , Page(s): 111 - 113
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB) |  | HTML iconHTML  

    In this letter, we present a simple design method for dual-band bandpass filters (BPFs) with two independently controllable bandwidths. The proposed design is based on hybrid resonators which have both series and shunt resonances. For compact size, an interdigital BPF type is utilized. The simple design procedures are established based on an equivalent lumped circuit of the proposed dual-band BPF. Moreover, the proposed BPF has good skirt characteristics through transmission zeros created by the series resonance in the hybrid resonator and the cross-coupling. The third-order dual-band BPF is designed at center frequencies of 1.85 and 2.85 GHz with fractional bandwidths of 11% and 7.3%. View full abstract»

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  • Multi-Layered Dual-Band Bandpass Filter Using Stub-Loaded Stepped-Impedance and Uniform-Impedance Resonators

    Publication Year: 2012 , Page(s): 114 - 116
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (415 KB) |  | HTML iconHTML  

    The design of multi-layered dual-band bandpass filter using stub-loaded stepped-impedance and uniform-impedance resonators is proposed. The filter is designed to have dual-passband at 2.4, and 5.2 GHz for Wireless Local Area Network (WLAN). The multi-layered filter consists of the stub-loaded stepped-impedance resonator (SL-SIR) on the top layer and the stub-loaded uniform-impedance resonator (SL-UIR) on the bottom layer, that can provide the multi-path propagation to enhance the filter performance and compact circuit size. The proposed SL-SIR and SL-UIR play important roles for controlling the transmission zeros at each first and second passband edges. The measured results are in good agreement with the full-wave electromagnetic simulation results. View full abstract»

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  • Novel Miniaturized RF MEMS Staircase Switch Matrix

    Publication Year: 2012 , Page(s): 117 - 119
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB) |  | HTML iconHTML  

    A novel implementation of wideband large switch matrices is proposed in this letter. The solution is based on staircase geometry. The approach demonstrates significant reduction in the number of control signal required compared to all existing RF MEMS switch matrix geometries, while maintaining the performance. This letter presents the design and characteristics of a semi-T switch cell and a 3 × 3 staircase switch matrix. The measurement of the switch matrix demonstrated excellent RF performance of maximum insertion loss of 2 dB, a return loss of better than 15 dB and an isolation higher than 40 dB for frequencies up to 40 GHz. To our knowledge, this is the first RF MEMS staircase switch matrix ever reported. View full abstract»

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  • Ferrite-Loaded Substrate Integrated Waveguide Switch

    Publication Year: 2012 , Page(s): 120 - 122
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (457 KB) |  | HTML iconHTML  

    A magnetically controlled switch based on ferrite-loaded substrate integrated waveguide (FLSIW) is proposed. FLSIW consists of rectangular ferrite slabs loaded on the sidewall slots of SIW where the magnetic fields are strongest. With the application of an external magnetic bias on the ferrite slabs, the cutoff frequency of the FLSIW is changed, thereby making the SIW switchable. An X-band reflective type single pole single through (SPST) switch is demonstrated. The switch has a 1.1 GHz switchable bandwidth centered at 10.1 GHz with an insertion loss of less than 1 dB in the on state and an isolation of 20 dB in the off state. View full abstract»

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  • Electrically Tunable Evanescent Mode Half-Mode Substrate-Integrated-Waveguide Resonators

    Publication Year: 2012 , Page(s): 123 - 125
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (571 KB) |  | HTML iconHTML  

    Electrically tunable evanescent mode half mode substrate integrated waveguide (HMSIW) resonators are implemented for S band applications. An HMSIW loaded with a complementary split ring resonator (CSRR) achieves forward electromagnetic wave transmission below the characteristic waveguide cutoff frequency due to evanescent wave amplification. A variable capacitor connected to one of the conductors of the CSRR changes its effective capacitance to ground, resulting in frequency tuning of the resonator. Three different configurations are investigated with a varactor diode connected between the ground and three different contact points of the CSRR. The external Q factor is slightly affected by the frequency tuning. More than 15% tunability is achieved around 3.4 GHz. Full wave structure simulation results are in good agreement with those of measurement. View full abstract»

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  • Design of a Waveguide Diplexer Based on Connected Bi-Omega Particles

    Publication Year: 2012 , Page(s): 126 - 128
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (414 KB) |  | HTML iconHTML  

    In this letter, we propose a new waveguide diplexer based on the employment of connected bi-omega particles. The component consists in a junction between three waveguides with the same cross-section. At either of the junction sections between the feeding waveguide and the two output ones, we place a set of connected bi-omega particles. The two sets of particles have different dimensions, in order to resonate at two different frequencies, enabling, thus, the frequency selective transmission required for the diplexer operation. The design is supported by proper full-wave numerical simulations and measurements. View full abstract»

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  • New Microstrip Gap Waveguide on Mushroom-Type EBG for Packaging of Microwave Components

    Publication Year: 2012 , Page(s): 129 - 131
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (502 KB) |  | HTML iconHTML  

    The gap waveguide has been recently presented as a new transmission line technology using artificial magnetic conductors (AMCs) to allow the wave propagation only along a desired path. The first validation has been provided using a lid of metal pins as AMC for high frequency applications. In this letter, simulations and measurement results are presented for another version called microstrip gap waveguide, working as inverted microstrip line and realized using a mushroom-type EBG surface. The transmission line is surrounded by mushrooms which create a parallel plate stop band, suppressing cavity modes and unwanted radiations compared to standard packaged microstrip transmission lines. The field propagates in the air gap between the upper lid and the mushrooms layer, providing a low loss compact circuit made in printed technology. View full abstract»

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  • A 3.6 mW 125.7–131.9 GHz Divide-by-4 Injection-Locked Frequency Divider in 90 nm CMOS

    Publication Year: 2012 , Page(s): 132 - 134
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (390 KB) |  | HTML iconHTML  

    A divide-by-4 injection-locked frequency divider (ILFD) is realized in a 90 nm CMOS process. By using the coupled inductors, the locking range of the proposed divide-by-4 ILFD is enhanced. This ILFD has a measured locking range of 125.7-131.9 GHz. Its power consumption is 3.6 mW for a supply of 1.2 V. To the authors' best knowledge, this is the first CMOS divide-by-4 ILFD operated over 130 GHz. View full abstract»

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  • A 60 GHz Current-Reuse LO-Boosting Mixer in 90 nm CMOS

    Publication Year: 2012 , Page(s): 135 - 137
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (530 KB) |  | HTML iconHTML  

    This letter presents a 60 GHz direct down-conversion mixer in a 90 nm CMOS. The mixer consists of an RF transconductance stage, a switching stage, an LO amplification stage, a balun and a buffer amplifier, and employs a current-reuse LO-boosting technique for low power consumption with small LO input power. The measured conversion gain of the differential IF output is 12 dB at an input LO power of -13 dBm. The mixer consumes 8.8 mW and the measured 3 dB IF bandwidth is greater than 1.2 GHz. To the best of our knowledge, this mixer achieves the highest conversion gain with the lowest LO input power of all published 60 GHz band CMOS mixers. View full abstract»

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  • 13 GHz CMOS Active Inductor LC VCO

    Publication Year: 2012 , Page(s): 138 - 140
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB) |  | HTML iconHTML  

    A 13 GHz active inductor LC voltage controlled oscillator (VCO) has been realized in 90 nm CMOS technology by ST-Microelectronics. The VCO consists of two complementary cross-coupled pairs, an active LC tank implemented by means of a differential high-Q low-noise active inductor and two p-MOSFET varicaps, and an output buffer stage. The measurements show a phase noise of -105.25 dBc/Hz at 1 MHz frequency offset. The current consumption of the VCO core and differential boot-strapped inductor amount to 0.7 and 1.8 mA, respectively, from a 1.2 V supply voltage. View full abstract»

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  • A X-Band {\rm I}/{\rm Q} Upconverter in 65 nm CMOS for High Resolution FMCW Radars

    Publication Year: 2012 , Page(s): 141 - 143
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (651 KB) |  | HTML iconHTML  

    This work presents a CMOS X-band I/Q upconverter for a FMCW radar system. The use of passive current mixers allows to address the main drawbacks of CMOS technology, namely flicker noise and reduced linearity due to low supply voltage, paving the way to monolithic integration with digital intensive baseband circuitry. Prototypes were built in a 65 nm digital technology, showing a peak output power of -3.4 dBm at 10.6 GHz with a corresponding HD3 lower than -40 dBc and an image rejection greater than 41 dB across the 9.5-12 GHz LO band, while adding negligible phase noise to the output signal. The circuit occupies an area of 0.91 mm2 and consumes 192 mW. View full abstract»

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  • Cryogenic InAs/AlSb HEMT Wideband Low-Noise IF Amplifier for Ultra-Low-Power Applications

    Publication Year: 2012 , Page(s): 144 - 146
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (292 KB) |  | HTML iconHTML  

    A cryogenic wideband 4-8 GHz hybrid low-noise amplifier, based on a 110 nm gate length InAs/AlSb HEMT process is presented. At room temperature the three-stage amplifier exhibited a transducer gain of 29 dB and a noise temperature of 150 K with 17.6 mW power consumption. When cooled to 13 K, the amplifier showed a minimum noise temperature of 19 K at a power consumption of 6 mW (66% reduction compared to room temperature). At cryogenic temperature, the optimum drain voltage for best noise performance was reduced from 0.55 V down to 0.3 V, demonstrating the very low-power and low-voltage capabilities of InAs/AlSb HEMT based low-noise amplifiers at cryogenic temperature. View full abstract»

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  • Superoscillatory Radar Imaging: Improving Radar Range Resolution Beyond Fundamental Bandwidth Limitations

    Publication Year: 2012 , Page(s): 147 - 149
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (219 KB) |  | HTML iconHTML  

    In this work, we propose to improve the range resolution in a conventional radar system by employing a superoscillatory pulse as the radar pulse. A superoscillatory waveform is a waveform which contains, across a finite time interval, faster variations than its highest constituent frequency component. As such, radar imaging using a superoscillatory pulse allows one to detect an object with a range resolution improved beyond a fundamental bandwidth limitation. In this work, we experimentally compare the radar resolution performance of a 500 MHz superoscillatory pulse with that of a sinc pulse of the same bandwidth, and demonstrate that the superoscillatory pulse reduces distance uncertainty by 36%. We also suggest future directions of development to our proposed radar system. View full abstract»

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  • Low-Cost Analog Pulse Compression Technique Based on Mixing With an Auxiliary Pulse

    Publication Year: 2012 , Page(s): 150 - 152
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    A low-cost analog pulse compression technique is proposed and experimentally demonstrated for a quasi-gaussian pulse. This technique consists in multiplying the pulse to compress with an auxiliary baseband gaussian pulse, which results in a compression of √2, and re-injecting this pulse n times around a loop including an amplifier, a delay line and an isolator, so as to achieve a compression factor of √1+n. In the experiment, a pulse width compression by a factor of 2.85 is achieved after the ninth turn, in good agreement with the theory. Due to its inherent analog nature, the proposed system is flexible, easy to implement, frequency scalable and capable to handle ultra-wideband signals. View full abstract»

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  • Simultaneous High Intensity Ultrashort Pulsed Electric Field and Temperature Measurements Using a Unique Electro-Optic Probe

    Publication Year: 2012 , Page(s): 153 - 155
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (254 KB) |  | HTML iconHTML  

    High intensity nanosecond pulsed electric fields and temperature were simultaneously measured using a unique electro-optic (EO) probe. The measurements were performed in an electroporation cuvette with 4 mm electrode gap and filled with a buffered salt solution. High voltage generators delivering 2.6 and 10 ns duration pulses with different pulses shape and intensity were investigated. The EO probe linearity was characterized up to 2 MV/m. The temperature measurement uncertainty was found to be less than 22 mK. Excellent measurement abilities were achieved with this EO probe showing its suitability for bioelectromagnetic experiments and particularly for wideband high intensity field applications. View full abstract»

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  • A Novel All-Digital Multichannel Multimode RF Transmitter Using Delta-Sigma Modulation

    Publication Year: 2012 , Page(s): 156 - 158
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    In this letter, we present a new all-digital multichannel multimode transmitter architecture. The main novelty is the development of an agile radio transmitter where the digital up-conversion to RF operating in the gigahertz frequency range and the multichannel transmission capacity are embedded into a single field-programmable gate array device. Its high flexibility and fast switching of the carriers' frequencies make this transmitter interesting for cognitive radio-based applications. View full abstract»

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  • Correction to “A 1–9 Linear-Wide-Tuning-Range Quadrature Ring Oscillator in 130 nm CMOS for Non-Contact Vital Sign Radar Application” [Jan 10 34-36]

    Publication Year: 2012 , Page(s): 159
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    In the above titled letter (ibid., vol. 20, no. 1, pp. 34-36, Jan. 2010), an incorrect version of (3) was published. The correct version is presented here. View full abstract»

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  • Advertisement - Have you visited lately? www.ieee.org

    Publication Year: 2012 , Page(s): 160
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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