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Microwave and Wireless Components Letters, IEEE

Issue 3 • Date March 2010

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Displaying Results 1 - 19 of 19
  • Table of contents

    Publication Year: 2010 , Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2010 , Page(s): C2
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  • Passivity-Preserving Interpolation-Based Parameterized Macromodeling of Scattered S-Data

    Publication Year: 2010 , Page(s): 133 - 135
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (671 KB) |  | HTML iconHTML  

    A new technique to build parametric macromodels based on scattered S-data samples in the design space is presented. Stability and passivity are guaranteed by construction over the entire design space by a robust and efficient two-step algorithm. In the first step, a set of univariate stable and passive macromodels is built. In the second step, a geometrical structure that determines the connections between the scattered data points in the design space is built to perform multivariate positive interpolation. View full abstract»

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  • Nonuniformly Folded Waveguide Resonators and Their Filter Applications

    Publication Year: 2010 , Page(s): 136 - 138
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (660 KB) |  | HTML iconHTML  

    Nonuniformly folded substrate integrated waveguide (SIW) resonator is proposed to design compact cavity filters with narrow to wide bandwidths. By taking advantages of the generated stepped impedance resonator (SIR), the harmonic resonance frequencies of the proposed resonator may be controlled by properly adjusting the length and impedance ratio of the resonator. With the first harmonic moved away from the fundamental, a compact filter of 5% bandwidth may be realized with better stopband performance than the conventionally unfolded one. Alternatively, by moving the first harmonic toward the fundamental, one may utilize the first two resonances of two cavities to realize a four-pole filter with a wide bandwidth of 38.5%. View full abstract»

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  • Miniature Microstrip Bandpass Filter Using Resonator-Embedded Dual-Mode Resonator Based on Source-Load Coupling

    Publication Year: 2010 , Page(s): 139 - 141
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (265 KB) |  | HTML iconHTML  

    A novel miniature microstrip bandpass filter (BPF) using resonator-embedded dual-mode resonator is proposed. Two transmission zeros are created to improve the selectivity of the filter. Furthermore, source-load capacitive coupling is introduced to create a transmission zero above the passband. A 2.28 GHz BPF with 300 MHz bandwidth is designed and measured, the measured result agrees well with the simulation. The size of the filter is less than 0.21 ?? ?? 0.15 ??, where ?? is guided wavelength at the central frequency. View full abstract»

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  • CPW-Fed Dual-Mode Double-Square-Ring Resonators for Quad-Band Filters

    Publication Year: 2010 , Page(s): 142 - 144
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (358 KB) |  | HTML iconHTML  

    We propose the improved CPW-fed configurations with dual-mode double-square-ring resonators (DMDSRR) for quad-band applications. The resonant frequency equations of DMDSRR are introduced for simply designing quad-band bandpass filter (BPF). Resonant frequencies can be controlled by tuning the perimeter ratio of the square rings. To obtain lower insertion loss, higher out-of-band rejection level and wider bandwidth of quad-band, the improved CPW-fed and dual-mode perturbations are designed. The proposed filter is successfully simulated and measured. It can be applied to 0.95, 1.26, 1.89 and 2.29 GHz systems. View full abstract»

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  • Compact UWB Bandpass Filter With Ultra Narrow Notched Band

    Publication Year: 2010 , Page(s): 145 - 147
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    A compact ultra-wideband (UWB) bandpass filter with an ultra narrow notched band is proposed using a hybrid microstrip and coplanar waveguide (CPW) structure. The CPW detached-mode resonator (DMR) composed of a quarter-wavelength (??/4) nonuniform CPW resonator with a short-stub and a ??/4 single-mode CPW resonator (SMCR) can allocate three split frequencies at the lower end, middle, higher end of the UWB passband. The conventional broadside-coupled microstrip/CPW structure is introduced to improve the bandwidth enhancement around the split frequencies, which leads to good UWB operation. To avoid the interferences such as WLAN signals, the ??/4 meander slot-line structure embedded in the DMR is employed to obtain the notched band inside the UWB passband. The design is then verified by experiment. Good passband and stopband performances are achieved. Specifically, the fabricated filter has a 10 dB notched fractional bandwidth (FBW) of 2.06% at the notched center frequency of 5.80 GHz. View full abstract»

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  • Investigation in Open Circuited Metal Lines Embedded in Defected Ground Structure and Its Applications to UWB Filters

    Publication Year: 2010 , Page(s): 148 - 150
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB) |  | HTML iconHTML  

    A novel method for notch implementation in ultrawideband (UWB) bandpass filter (BPF) using open circuited metal lines embedded in a defected ground structure (DGS) is proposed. Distinct from traditional notch implementation, the proposed method uses the additional metal lines with half waveguide length embedded in defected ground structure to produce additional notch band behavior based on the DGS bandpass behavior. Furthermore, the equivalent circuit model of the proposed UWB BPF with notch implementation is established for explaining the circuit behaviors more explicitly. In this way, the proposed circuit has a very small size, only amounting to 0.41 by 0.22 guided wavelength at the center frequency of 6.85 GHz. The experimental filter has a notch band frequency of 5.5 GHz, with two observable attenuation poles at 1.65 and 11.36 GHz, respectively. The measured BPF insertion loss is less than 1.0 dB throughout the passband of 3.1 to 10.6 GHz, and the variation of group delay is less than 0.2 ns in this band, except for the notched band. View full abstract»

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  • Double-Ladder Filter Topology for a Dual-Band Transmission Response Based on Bulk Acoustic Wave Resonators

    Publication Year: 2010 , Page(s): 151 - 153
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (112 KB) |  | HTML iconHTML  

    Filters based on bulk acoustic wave resonators present very good performance, small size and compatibility with IC technology. However, the traditional configurations present only one frequency transmission band. In this work, a configuration based on electrically coupled BAW resonators has been developed in order to obtain a dual-band response, where each of these bands can be allocated at a desired frequency. In order to validate the proposed topology, a filter response using measured resonators is shown. View full abstract»

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  • A Coaxial Stub Microfluidic Impedance Transformer (COSMIX)

    Publication Year: 2010 , Page(s): 154 - 156
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (447 KB) |  | HTML iconHTML  

    This letter proposes a coaxial stub microfluidic impedance transformer and discusses its design, theory, and operation. Electrostatically-stabilized colloidal dispersions using non-aqueous fluids facilitate its electromagnetic agility by altering their effective medium properties. Theoretical, simulated, and measured results at 400 MHz, 800 MHz, and 1.6 GHz using 0%, 25%, and 50% volume fractions of colloidal barium strontium titanate dispersed in a low-loss severely hydrotreated mineral oil are included to demonstrate the operation of the device. Simulated results for non-spherical nanoparticles are included to show the potential of different material systems. View full abstract»

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  • A New Broadband Marchand Balun Using Slot-Coupled Microstrip Lines

    Publication Year: 2010 , Page(s): 157 - 159
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (473 KB) |  | HTML iconHTML  

    In this letter, a new broadband Marchand balun is proposed using slot-coupled microstrip lines. The developed balun is connected by two sections of diamond-shape slot-coupled microstrips with short- and open-circuited terminations at specified ports. To achieve the broadband operation, the simple formulas have been derived to convert the conventional rectangular-shape slot-coupled microstrip to the diamond-shape counterpart. The measured results of the developed balun not only agree with the full-wave simulation results very well, but also resemble the calculated results by ideal coupled lines. The new Marchand balun developed in this letter has a 10 dB return loss bandwidth of 90%, while in this frequency range the amplitude imbalance varies from -0.37 dB to 0.32 dB, and the phase difference in the range of -180.4?? ~ -181.8??. View full abstract»

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  • 60 GHz Double-Balanced Gate-Pumped Down-Conversion Mixers With a Combined Hybrid on 130 nm CMOS Processes

    Publication Year: 2010 , Page(s): 160 - 162
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (622 KB) |  | HTML iconHTML  

    Two 60-GHz compact double-balanced gate-pumped mixers using standard bulk 0.13 ??m CMOS process are presented. The homodyne and heterodyne mixers utilize small-size combined hybrids and demonstrated a small chip size of 0.8 ?? 0.85 and 0.7 ?? 0.7 mm2, including pads. With 5 dBm LO power, the best measured conversion gains are 1 and 0 dB in the 3 dB bandwidths of 15 GHz from 54 to 69 GHz and 14 GHz from 53 to 67 GHz RF. The LO-to-RF isolations are greater than 45 dB at a low bias of 1.2 V and 12 m A. This is the first demonstration of the double-balanced gate mixer in millimeter wave frequency. View full abstract»

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  • An UMTS and GSM Low Phase Noise Inductively Tuned LC VCO

    Publication Year: 2010 , Page(s): 163 - 165
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (397 KB) |  | HTML iconHTML  

    A voltage controlled oscillator (VCO) design strategy for extended tuning range with low phase noise at critical GSM and UMTS frequencies is applied and verified by simulations, implementation and measurements on 130 nm CMOS. The oscillator tuning range is expanded from 49.4% to 60.2% by shorting transformer secondary winding with a switch. The VCO achieves a phase noise of -126.1 dBc/Hz (switch ??off??) and -123.4 dBc/Hz (switch ??on??) at a 1 MHz offset from a 4 GHz and 4.8 GHz carrier while consuming less than 7.5 mA from 1.8 V power supply. View full abstract»

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  • A 0.3 V Cross-Coupled VCO Using Dynamic Threshold MOSFET

    Publication Year: 2010 , Page(s): 166 - 168
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (426 KB) |  | HTML iconHTML  

    An ultra-low voltage differential voltage-controlled oscillator (VCO) is designed and implemented in a 0.13 ?? m CMOS 1P8M process. The designed circuit topology is an nMOS-core cross-coupled LC-tank VCO, and a self-generated 2nd harmonic ac signal is coupled to the bodies of MOSFETs to enhance the VCO performance. At the supply voltage of 0.3 V, the output phase noise of the VCO is -116.88 dBc/Hz at 1 MHz offset frequency from the carrier frequency of 3.579 GHz, and the figure of merit is -194.43 dBc/Hz. Total power consumption is 0.225 mW. Tuning range is about 240(770) MHz, from 3.39 to 3.63(4.16) GHz, while the control voltage was tuned from 0 V to 0.3(1.0) V. View full abstract»

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  • Dual-Path LC VCO Design With Partitioned Coarse-Tuning Control in 65 nm CMOS

    Publication Year: 2010 , Page(s): 169 - 171
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (749 KB) |  | HTML iconHTML  

    This letter describes a dual-path LC voltage controlled oscillator (VCO) design that reduces both coarse-tuning and fine-tuning sensitivities. By using a combination of discrete and continuous tuning methods for the coarse-tuning control, a very high gain ratio between the coarse-tuning path and the fine-tuning path can be avoided, significantly alleviating noise and coupling problems due to high coarse-tuning gain. A 3.03-3.67 GHz dual-path VCO in 65 nm CMOS exhibits -120.7 dBc/Hz at a 400 kHz offset from a 1.73 GHz carrier, showing better performance than the conventional single-path VCO that is implemented for comparison. View full abstract»

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  • A 2.16 mW Low Power Digitally-Controlled Variable Gain Amplifier

    Publication Year: 2010 , Page(s): 172 - 174
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (267 KB) |  | HTML iconHTML  

    A low power digitally-controlled CMOS variable gain amplifier (VGA) was fabricated in a TSMC 0.18 ??m CMOS technology. By extending the transconductor operation range from saturation mode for high gain to triode mode for low gain, the proposed VGA can obtain a wide gain range with low power dissipation. The power consumption of the proposed VGA is as small as 2.16 mW while keeping a wide gain range of 53 dB. The proposed VGA has a controlled gain from -22 dB to 31 dB with 1 dB steps. When the proposed VGA was set to a maximum gain, the total harmonic distortion (THD) and the 3 dB bandwidth are -48 dB and at least 65 MHz, respectively. View full abstract»

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  • Isotropic and Homogeneous Behavior of Chiral Media Based on Periodical Inclusions of Cranks

    Publication Year: 2010 , Page(s): 175 - 177
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    Isotropic chiral materials at microwave frequency are usually obtained by distributing, as random as possible, elements of chiral symmetry in a host medium. Here we propose a new manufacturing technique based on the precise location of same handedness cranks in a periodical configuration. By this method electromagnetic active media are produced with homogeneous, isotropic and reciprocal behavior for the microwave frequency range. These materials also present some fabrication advantages and new parameters for material design. View full abstract»

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  • A Framework for Broadband Characterization of Individual Nanowires

    Publication Year: 2010 , Page(s): 178 - 180
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (563 KB) |  | HTML iconHTML  

    A framework for broadband characterization of individual nanowires (NWs) is discussed in this letter. Specifically, on-wafer multiline thru-reflect-line (TRL) measurements, finite element modeling, and specially fabricated test structures with both extremely high and low impedances are jointly used to validate the feasibility of both measurements and modeling for characterizing small components. The test structures are designed as coplanar waveguide (CPW) devices with 100 nm and 250 nm diameter platinum (Pt) NWs. Though it is not possible to distinguish between the conductivity of the wire and contact resistances, we determine a range for conductivity and contact resistance over wide microwave bandwidth by minimizing the standard deviation between the measurements and full-wave modeling. View full abstract»

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  • IEEE Microwave and Wireless Components Letters Reviewers List

    Publication Year: 2010 , Page(s): C3
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    Freely Available from IEEE

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