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Microwave and Wireless Components Letters, IEEE

Issue 1 • Date Jan. 2010

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Displaying Results 1 - 23 of 23
  • Table of contents

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

    Page(s): C2
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  • A Nonspurious 3-D Vector Discontinuous Galerkin Finite-Element Time-Domain Method

    Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    We propose a nonspurious vector discontinuous Galerkin finite-element time-domain (DG-FETD) method for 3-D electromagnetic simulation. To facilitate the implementation of numerical fluxes for domain decomposition, we construct the DG-FETD scheme based on the first-order Maxwell's equations with variables E and H. The LT/QN and the CT/LN edge elements are employed to represent E and H, respectively (or vice versa), to suppress spurious modes, and the Riemann solver is utilized as the numerical flux to correct fields on the interfaces between adjacent subdomains. Numerical experiments show the nonspurious property of the proposed method. View full abstract»

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  • Lumped Circuit Models for Degenerate Band Edge and Magnetic Photonic Crystals

    Page(s): 4 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (444 KB) |  | HTML iconHTML  

    Multiport circuit models are presented to emulate a new class of periodic anisotropic crystals exhibiting dispersion diagrams with degenerate band edges or stationary inflection points (SIPs). Specifically, a 4-port lumped circuit is introduced to model a partially coupled pair of microstrip lines known to emulate propagation in an anisotropic medium. A 6-port circuit is also presented to model three partially coupled transmission lines. Under specific coupling conditions, the latter circuit can support the SIP associated with the K-?? curves of magnetic photonic crystals. View full abstract»

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  • A Coplanar Strip Slow Wave Structure for the Optical Directional Coupler Modulators

    Page(s): 7 - 9
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (566 KB) |  | HTML iconHTML  

    A design of a coplanar stripline (CPS) slow wave structure, which has for the first time both series inductive and shunt capacitive sections, has been developed. It has been designed to match the RF/microwave modulation signal phase velocity to the optical wave velocity in GaAs optical waveguides. In this design, the CPS with series inductances and shunt capacitances retains the characteristic impedance at 50 ?? . This slow wave structure provides flexibility of design for narrow gap CPS structures. The effective refractive index and characteristic impedance of this design have been measured in the frequency range of up to 45 GHz and compared to simulations. View full abstract»

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  • Network Modeling of Aperture-Coupled Vertically Mounted Slotline Coupling Structure

    Page(s): 10 - 12
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    A general analysis of a microstrip-to-vertically mounted slotline (VMS) coupling structure is presented with a view to developing an equivalent circuit, and the efficient evaluation of the related circuit element values is described. To check the validity of the proposed analysis and design theory, a C-band linearly tapered slot antenna fed by an aperture-coupled microstripline-to-VMS coupling structure is optimally designed, and its computed characteristics, derived from the network analysis, are compared with measurement and simulation results. Reasonable agreement was observed, fully validating the efficiency and accuracy of the proposed network model. View full abstract»

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  • Novel Ultra-Wideband (UWB) Multilayer Slotline Power Divider With Bandpass Response

    Page(s): 13 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB) |  | HTML iconHTML  

    A novel ultra-wideband (UWB) multilayer slotline power divider with bandpass filtering response is presented. In the proposed structure, a single isolation resistor is properly placed between the two output ports. Based on the transmission-line equivalent-circuit method, the design equations of the proposed UWB power divider has been derived with the even and odd mode analyses. Experimental results show that excellent impedance matching at all three ports, amplitude and phase balance at the two output ports, isolation between the two output ports, and out-of-band rejection are observed at the UWB band. View full abstract»

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  • A Planar Dual-Band Filter Based on Reduced-Length Parallel Coupled Lines

    Page(s): 16 - 18
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (196 KB) |  | HTML iconHTML  

    A planar dual-band filter is demonstrated that is based on reduced-length parallel coupled lines. By reactively loading a reduced-length coupled line, a dual-band performance is obtained. The dual-band filter is developed by cascading these dual-band coupled lines. A complete set of design equations is provided that can be applicable to an arbitrary number of filter stages. Experimental results for a Chebyshev-type dual-band filter with center frequencies at 2.4 and 5.2 GHz are in excellent agreement with the full-wave simulated results. View full abstract»

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  • Novel Balanced Dual-Band Bandpass Filter Using Coupled Stepped-Impedance Resonators

    Page(s): 19 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (319 KB) |  | HTML iconHTML  

    A novel balanced dual-band bandpass filter, using coupled stepped-impedance resonators (SIRs), is proposed in this letter. The differential- and common-mode equivalent half circuits are given. By properly designing the resonators, associated with the filter composed of eight SIRs, dual-band differential-mode bandpass response can be obtained. To improve the common-mode suppression level, two open stubs with different lengths are added to the connection point of two resonators. A prototype balanced filter operating at 2.4 and 5 GHz has been realized to validate the proposed concept and theory. View full abstract»

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  • A Coplanar Stripline Ultra-Wideband Bandpass Filter With Notch Band

    Page(s): 22 - 24
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB) |  | HTML iconHTML  

    In this letter, a design of a compact coplanar stripline ultra-wideband bandpass filter with a narrow rejection band is reported. The filter characteristic is obtained by using stepped impedance open-circuited series stubs. It is shown that the rejection band can be placed at a desired frequency by tuning the width of the high impedance section of the series stub. Full-wave simulated and experimental results of a filter prototype are presented. View full abstract»

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  • A Multilayered Parallel Coupled Microstrip Bandpass Filter With Embedded SIR Cells to Have a Broad Upper Rejection Band

    Page(s): 25 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB) |  | HTML iconHTML  

    This paper proposes a parallel coupled microstrip bandpass filter (BPF) with folded stepped impedance resonator (SIR) cells on the middle layer for spurious suppression. The folded SIR cells on the middle layer create a wide stopband by canceling the second and third harmonics of the parallel coupled microstrip BPF with suppression of over -50 and -30 dB, respectively. By selecting properly the impedance ratio (R) and physical length ratio (??) of the folded SIRs, the parallel coupled BPF with a wide stopband can be implemented without causing a package problem of degrading the complete ground plane. The proposed BPF is designed and fabricated. Good agreement between the electromagnetic (EM) simulation and measurement is obtained. View full abstract»

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  • Wideband Bandpass Filter With Reconfigurable Bandwidth

    Page(s): 28 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (157 KB) |  | HTML iconHTML  

    This letter proposes a novel building block for developing tunable wideband bandpass filters. The proposed circuit block mainly consists of short circuit coupled lines and short circuit stubs with pin diodes as tuning elements. This work aims to demonstrate reconfigurable bandwidth of this type of filter. Two filters are designed and fabricated; one can be switched between a fractional bandwidth (FBW) of 16.3% and 35% at a center frequency of 1.9 GHz, and the other can be switched from a FBW of 27.8% to 37.4% at a center frequency of 1.9 GHz. The insertion loss and return loss in the first filter range from 4.17 dB to 0.4 dB and 27.54 dB to 19.04 dB. The second filter exhibits an insertion loss ranging from 0.73 dB to 0.43 dB and a return loss range from 31.1 dB to 27.7 dB. The tested filters show good agreement with EM simulations. View full abstract»

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  • Parallel Plate Cavity Mode Suppression in Microstrip Circuit Packages Using a Lid of Nails

    Page(s): 31 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (474 KB) |  | HTML iconHTML  

    The suppression of parallel plate and cavity modes in shielded microstrip circuits is presented. To this aim a textured metal lid consisting of periodically located pins known as a bed of nails is employed. The mode suppression has a bandwidth of more than 2:1, and it does not interfere much with the microstrip circuit. Thereby, this mode suppression technique introduces a new advantageous packaging technology for high frequency circuits. View full abstract»

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  • A 1–9 GHz Linear-Wide-Tuning-Range Quadrature Ring Oscillator in 130 nm CMOS for Non-Contact Vital Sign Radar Application

    Page(s): 34 - 36
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    A 1-9 GHz linear-wide-tuning-range quadrature ring oscillator has been designed and fabricated in UMC 0.13 ??m CMOS process. The chip was wire-bonded on printed circuit board and tested, showing a liner tuning range from 1 GHz to 9 GHz. Comparative study with other differential ring oscillators demonstrates the advantages of this design in low power consumption and linear-tuning. The oscillator was designed as the voltage controlled oscillator (VCO) for a non-contact vital sign radar sensor. It can also be used for other applications such as ultra-wideband (UWB) impulse radio and clock recovery in broadband optical communications. View full abstract»

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  • Highly Linear Ku-Band SiGe PIN Diode Phase Shifter in Standard SiGe BiCMOS Process

    Page(s): 37 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (205 KB) |  | HTML iconHTML  

    This letter presents a fully integrated highly linear 4-bit SiGe PIN diode phase shifter MMIC for Ku-band phase-array application in the standard SiGe BiCMOS process. High-performance customized SiGe PIN diode switches are employed for high linearity and low insertion loss. The use of differential inductors in the hybrid switched filters makes this phase shifter compact in size. Measurements show 20 dB ??5 dB input/output return loss, less than ?? 1.8?? phase variation, and maximum 37 dBm input-referred IP3 over the 14.5-15.5 GHz frequency range, while this phase shifter draws an average current of 3.5 mA from a 3.3 V power supply. To the authors' best knowledge, this 4-bit phase shifter MMIC achieves the highest linearity at Ku-band in the standard SiGe BiCMOS process without utilizing any post-fabrication process for low loss transmission lines. View full abstract»

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  • A Low-Noise Amplifier With Tunable Interference Rejection for 3.1- to 10.6-GHz UWB Systems

    Page(s): 40 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (165 KB) |  | HTML iconHTML  

    An ultrawideband common-gate low noise amplifier with tunable interference rejection is presented. The proposed LNA embeds a tunable active notch filter to eliminate interferer at 5-GHz WLAN and employs a common-gate input stage and dual-resonant loads for wideband implementation. This LNA has been fabricated in a 0.18-??m CMOS process. The measured maximum power gain is 13.2 dB and noise figure is 4.5-6.2 dB with bandwidth of 3.1-10.6 GHz. The interferer rejection is 8.2 dB compared to the maximum gain and 7.6 dB noise figure at 5.2 GHz , respectively. The measured input P1dB is -11 dBm at 10.3 GHz. It consumes 12.8 mA from 1.8-V supply voltage. View full abstract»

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  • A 4–17 GHz Darlington Cascode Broadband Medium Power Amplifier in 0.18- \mu m CMOS Technology

    Page(s): 43 - 45
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    This letter presents a broadband medium power amplifier in 0.18-μm CMOS technology. The Darlington cascode topology is used to achieve wide bandwidth, flat gain and power frequency response. For wideband matching consideration, an interstage inductor and series peaking RL circuit are adopted. An output high pass matching circuit is used to maintain gain and power flatness at high frequency. The measured results show that the proposed PA demonstrates a gain of 10 dB from 4 to 17 GHz with less than 2-dB ripple, and a saturation output power of 16 to 18 dBm with PAE of better than 10% and power consumption of 306 mW. The chip size is only 0.67 mm2 . View full abstract»

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  • Millimeter-Wave Power Amplifier Based on Coaxial-Waveguide Power-Combining Circuits

    Page(s): 46 - 48
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    A millimeter-wave power amplifier based on a coaxial-waveguide power-combining circuit is presented in this paper. A coaxial stepped impedance transformer is used to provide an impedance transition from the 50-?? input coaxial line to the oversized coaxial waveguide, and its equivalent-circuit model has also been developed. A Ka-band four-device coaxial-waveguide power amplifier is fabricated and tested. The 10-dB return loss bandwidth of the fabricated amplifier is from 27.5 to 40 GHz, and the power amplifier has 17-25.9 dB gain over a wide bandwidth from 26 to 38 GHz. The measured output power at 1-dB gain compression is about 26.6 dBm at 30 GHz, with a power-combining efficiency of about 90%. View full abstract»

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  • High-Voltage High-Efficiency Ultrawideband Pulse Synthesizer

    Page(s): 49 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (139 KB) |  | HTML iconHTML  

    A novel ultrawideband pulse synthesizer based on distributed amplifier topology is presented. The basic concept is to combine different delayed Gaussian pulses with both positive and negative polarities to form an UWB pulse. Compared to other ultrawideband pulse-formation methods, this method can have both high-efficiency and high-voltage output. The prototype circuit based on 0.25-??m pHEMT transistors is fabricated, and the fabricated pulse synthesizer consumes only 1-mA current under 5-V power supply with high energy efficiency of 10.1% at 10-MHz pulse repetition frequency (PRF). Measurement results show that with 1.5 -V amplitude and 240-ps Gaussian input pulse, the output pulse of the designed UWB pulse synthesizer is centered at 4 GHz with 4.5-V peak to peak amplitude (into 50-ohms load) and 1.0-ns duration at 50% of the peak pulse envelope. View full abstract»

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  • A Low-Noise and Low-Power Frequency Synthesizer Using Offset Phase-Locked Loop in 0.13- \mu{\rm m} CMOS

    Page(s): 52 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (455 KB) |  | HTML iconHTML  

    In this letter, a fractional-N frequency synthesizer based on an offset phase-locked loop (OPLL) architecture is presented. The proposed synthesizer achieves low-noise as the two low-pass filters that are inherent in the OPLL highly suppresses the quantization noise from the delta-sigma modulator. In addition, it consumes low power by employing charge-recycling technique in the sub-PLL. A prototype synthesizer implemented in 0.13 μm CMOS process achieves 9 dB of noise reduction compared to a conventional PLL while consuming 3.2 mW of power. View full abstract»

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  • An X-Band AlGaN/GaN MMIC Receiver Front-End

    Page(s): 55 - 57
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    This letter presents an integrated AlGaN/GaN X-band receiver front-end. This is to the authors knowledge the first published results of an integrated AlGaN/GaN MMIC receiver front-end. The receiver uses an integrated SPDT switch to reduce size, weight and cost compared to circulator based transceiver front-ends. The integrated front-end has more than 13 dB of gain and a noise figure of 3.5 dB at 11 GHz. View full abstract»

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  • Four-Port Communication Receiver With Digital IQ-Regeneration

    Page(s): 58 - 60
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    The five(six)-port communication receiver uses one or two additional outputs in comparison with classical homodyne demodulators. This paper demonstrates for the first time the demodulation of RF signals and the regeneration of IQ-signals by means of a four-port receiver. This system comprises a four-port linear junction and two quadratic detectors with a square-law characteristic. A digital signal processing block completes the circuit to regenerate the IQ-signals without any constraint on the system or the signal. In comparison with the five(six)-port technique, the four-port reduces the circuit size, the cost and the power consumption. View full abstract»

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  • IEEE Microwave and Wireless Components Letters Reviewers List

    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