# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 28

Publication Year: 2008, Page(s): C1
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• ### IEEE Microwave and Wireless Components Letters publication information

Publication Year: 2008, Page(s): C2
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• ### Fast Parametric Macromodeling of Frequency Responses Using Parameter Derivatives

Publication Year: 2008, Page(s):761 - 763
Cited by:  Papers (2)
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This letter presents a generalization of the multivariate Vector Fitting technique that includes parameter derivatives in the macromodeling process. The computational cost to simulate partial derivatives in terms of the parameters is often substantially lower than the simulation cost of additional data samples. An example shows that the inclusion of derivatives can be useful to reduce the required... View full abstract»

• ### A New Hybrid DGTD/FDTD Method in 2-D

Publication Year: 2008, Page(s):764 - 766
Cited by:  Papers (12)
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In this letter, we present a method to efficiently hybridize the discontinuous Galerkin time domain method (DGTD) with the classical finite difference time domain method (FDTD). The main advantage of this hybrid method is that it maintains the generality of FDTD to treat the main part of a complex inhomogeneous problem, applying only DGTD for accurately taking into account the geometrical details ... View full abstract»

• ### Design of a Wide Stopband Microstrip Bandpass Filter With Interdigital Resonators

Publication Year: 2008, Page(s):767 - 769
Cited by:  Papers (3)
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In this letter, a novel microstrip bandpass filter (BPF) with interdigital resonators is presented. With the interdigital resonators and shorted asymmetrical coupled-lines, a wide bandwidth with sufficient rejection level can be achieved easily. A full-wave electromagnetic simulator IE3D is used, and the prototype of the BPF is fabricated and measured. Comparisons of simulated results and experime... View full abstract»

• ### Design of the Compact Wideband Bandpass Filter With Low Loss, High Selectivity and Wide Stopband

Publication Year: 2008, Page(s):770 - 772
Cited by:  Papers (21)
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In this letter, a novel compact wideband bandpass filter using the asymmetric stepped-impedance resonator (SIR) with one step discontinuity is designed and implemented to achieve characteristics of low loss, wide stopband and very high passband selectivity, simultaneously. The first two resonant modes of the asymmetric SIR are coupled together and applied to create a wide passband. The design proc... View full abstract»

• ### Generalized Coupling Coefficient for Filters With Nonresonant Nodes

Publication Year: 2008, Page(s):773 - 775
Cited by:  Papers (16)
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In this letter, we introduce a generalization of the coupling coefficient definition that applies to filters, including nonresonating nodes. The novel coefficients are evaluated from the synthesized low-pass prototype (suitable formulas are given); they allow an easier prototype de-normalization because no complicated network transformation is requested. Several different solutions with preassigne... View full abstract»

• ### Employing Open/Short Via-Hole to Control the Coupling Coefficient for LTCC Bandpass Filters

Publication Year: 2008, Page(s):776 - 778
Cited by:  Papers (3)
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In this letter, the multilayered bandpass filter (BPF) is synthesized with the assistance of via-holes. By controlling the coupling coefficient with open or short via-hole, the transmission zero can be shifted to lower or higher passband skirt. Theoretical analysis and design procedures are provided. The prototypical low-temperature co-fired ceramic BPFs are fabricated and measured as well. In add... View full abstract»

• ### Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths

Publication Year: 2008, Page(s):779 - 781
Cited by:  Papers (55)
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A compact microstrip dual band bandpass filter (BPF) using novel E-type resonators is presented in this letter. The E-type resonator is a short-circuited stub loaded hairpin resonator, two passband frequencies of which can be regulated by adjusting the characteristic impedance and electrical length of the hairpin and the stub. By combining pseudo-interdigital coupling structure, the coupling coeff... View full abstract»

• ### Dual-Band Capacitive Loaded Frequency Selective Surfaces With Close Band Spacing

Publication Year: 2008, Page(s):782 - 784
Cited by:  Papers (43)
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In this letter, a novel miniaturized dual-band capacitive loaded frequency selective surface (FSS) is presented, in which each periodic cell consist of two neighboring capacitive loaded ring slot resonator with the same dimension. To eliminate the undesired coupling between unit cells, the unit cell is placed in a Faraday cage structure created by arrays of metallic substrate vias. An S-band dual-... View full abstract»

• ### A Second-Order Dual X-/Ka-Band Frequency Selective Surface

Publication Year: 2008, Page(s):785 - 787
Cited by:  Papers (60)
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In this letter, a new technique for designing dual-band frequency selective surfaces with arbitrary bands of operation, with second-order band-pass responses at each band of operation, is presented and experimentally verified. The technique is based on utilizing a particular topology of a second-order band-pass microwave filter and synthesizing its constituting elements using periodic structures w... View full abstract»

• ### A New Calibration-Independent Method for Complex Permittivity Extraction of Solid Dielectric Materials

Publication Year: 2008, Page(s):788 - 790
Cited by:  Papers (34)
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Microwave nonresonant methods generally require some sort of calibration before conducting the measurements. Calibration-independent nonresonant methods are very attractive since they eliminate this need. In the literature, different calibration-independent methods for complex permittivity determination of materials have been proposed. While some of them use uncalibrated S-parameter measure... View full abstract»

• ### First- and Second-Order Differentiators Based on Coupled-Line Directional Couplers

Publication Year: 2008, Page(s):791 - 793
Cited by:  Papers (5)
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First- and second-order differentiators based on coupled-line directional couplers are presented. The time-derivative effect of coupled-line directional couplers is shown theoretically by applying Kirchhoff's laws to infinitesimal electromagnetically coupled transmission line sections. The time-derivation is accurate under the condition DeltaTf 0 Gt 1/4, where DeltaT is th... View full abstract»

• ### A Wide-Band Passive Equalizer Design on PCB Based on Near-End Crosstalk and Reflections for 12.5 Gbps Serial Data Transmission

Publication Year: 2008, Page(s):794 - 796
Cited by:  Papers (8)  |  Patents (1)
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We propose a wide-band passive equalization method for high-speed serial chip-to-chip input/output channels using wave propagation, reflection, and coupling effects on a tightly coupled transmission line structure. This design offers precise control of wideband equalization and low-power consumption as compared to previous active and discrete passive equalizers. Significant improvements in timing ... View full abstract»

• ### A 1.5–9.6 GHz Monolithic Active Quasi-Circulator in 0.18 $mu{rm m}$ CMOS Technology

Publication Year: 2008, Page(s):797 - 799
Cited by:  Papers (23)
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An active quasi-circulator MMIC was designed and fabricated in a standard 0.18-mum CMOS technology. The quasi-circulator combines common-source, common-gate, and common-drain configurations to improve the isolation between ports, and has an insertion loss less than 6 dB and an isolation better than 18 dB over 1.5-9.6 GHz. View full abstract»

• ### Novel Active Quasi-Circulator With Phase Compensation Technique

Publication Year: 2008, Page(s):800 - 802
Cited by:  Papers (18)
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A novel active quasi-circulator using phase compensation technique for wideband isolation is proposed. It is formed by configuring three transistors with a complimenting phase shifter for equalization. It provides wideband frequency operation with sufficient return loss and isolation between ports without the need for passive filters. This compensation technique minimizes the circulator's size com... View full abstract»

• ### A Low-Power and High-Gain Mixer for UWB Systems

Publication Year: 2008, Page(s):803 - 805
Cited by:  Papers (28)  |  Patents (1)
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This letter presents a CMOS double-balanced direct-conversion mixer for ultra-wideband systems. The proposed mixer employs three techniques: the subthreshold operation of transistors for the radio frequency stage reduces current dissipation in the overall mixer, a local oscillation (LO) stage using an inverter lowers the required LO amplitude, and an active load improves conversion gain. The mixer... View full abstract»

• ### Wide-Band Single-Side Band Subharmonic Mixer Constructed With Re-Entrant Couplers and Lumped-Element Coupler

Publication Year: 2008, Page(s):806 - 808
Cited by:  Papers (3)
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This work presents a new configuration of single-side band (SSB) harmonically pumped mixer implemented by using two kinds of wide-band quadrature couplers to achieve the characteristics of wide operation bandwidth, high side band suppression and compact circuit size. A new type of 3 dB re-entrant microstrip coupler, which is easy to integrate with the surface-mounted devices, is adopted to achieve... View full abstract»

• ### An Optimum Current Mirror Ratio for Low Phase Noise LC–VCO

Publication Year: 2008, Page(s):809 - 811
Cited by:  Papers (5)
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A design technique for a low phase noise inductor- capacitor voltage-controlled oscillator (VCO) using an optimum current ratio between the oscillating core and the bias circuit is proposed. Conventionally, it is preferred that the current in the oscillating core is maximized to reduce the phase noise. In this letter, however, we find that an optimum current ratio exists for low phase noise for a ... View full abstract»

• ### Time-Switched Derivative Superposition for FET Amplifier Linearization

Publication Year: 2008, Page(s):812 - 814
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A traditional derivative superposition amplifier combines the outputs of two transistors biased at different gate voltages such that the distortion from each device cancel. A time-switched derivative superposition technique is proposed, that requires only a single transistor. It is shown that such a configuration is simple to implement, while improving both linearity and power consumption of a sin... View full abstract»

• ### X-Band Substrate Integrated Waveguide Amplifier

Publication Year: 2008, Page(s):815 - 817
Cited by:  Papers (34)
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Design and realization of a compact X-band single-transistor amplifier with substrate integrated waveguide (SIW)-based input and output matching networks is presented. The overall size of the proposed SIW amplifier is only 1.5lambdag at the center frequency. Using a calibration technique, we extract the S-parameters of the fabricated amplifier with reference to its SIW ports. Mea... View full abstract»

• ### A W-Band Medium Power Amplifier in 90 nm CMOS

Publication Year: 2008, Page(s):818 - 820
Cited by:  Papers (38)
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A W-band CMOS medium power amplifier (PA) is presented in this letter. The circuit is implemented in 90 nm mixed signal/radio frequency CMOS process. By utilizing balanced architecture, the PA demonstrated a measured maximum small signal gain of 17 dB with 3 dB bandwidth from 91 to 108 GHz. The saturation output power (P sat) is 12 dBm between 90 and 100 GHz for V ds<... View full abstract»

• ### A Single Sideband RF-Modulator for Digital-IF Transmitter

Publication Year: 2008, Page(s):821 - 823
Cited by:  Patents (1)
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The limitation of the single-sideband rejection ratio (SSRR) performance of transmitters based on I/Q mismatching due to high frequency signals has been investigated. The proposed single-sideband radio frequency-modulator (SSM) is capable of generating a single sideband frequency without implementing a quadrature local oscillator which displaces a phase of a local oscillating signal by 90deg at a ... View full abstract»

• ### A 9 mW Highly-Digitized 802.15.4 Receiver Using Bandpass $SigmaDelta$ ADC and IF Level Detection

Publication Year: 2008, Page(s):824 - 826
Cited by:  Papers (5)
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A low power (9 mW) highly-digitized 2.4 GHz receiver for sensor network applications (IEEE 802.15.4 LR-WPAN) is realized by a 0.18 mum CMOS process. We adopted a novel receiver architecture adding an intermediate frequency (IF) level detection scheme to a low-power complex fifth-order continuous-time (CT) bandpass SigmaDelta modulator in order to digitalize the receiver. By the continuous-time ban... View full abstract»

• ### Range Correlation Effect on the Phase Noise of an UHF RFID Reader

Publication Year: 2008, Page(s):827 - 829
Cited by:  Papers (3)
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Phase noise is an important parameter in designing radio frequency (RF) systems since it can have large influence on system performance. Especially in RF identification (RFID) systems, phase noise is significantly reduced by the range correlation effect. Therefore the range correlation effect on the phase noise should be carefully considered in analyzing system performance and/or determining requi... View full abstract»

## 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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## Meet Our Editors

Editor in Chief
N. Scott Barker
Dept. Elect. Comp. Eng.
University of Virginia
Charlottesville, VA 22904
barker@virginia.edu
dsk6n@virginia.edu