# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 28

Publication Year: 2014, Page(s):C1 - C4
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• ### IEEE Microwave and Wireless Components Letters publication information

Publication Year: 2014, Page(s): C2
| PDF (154 KB)
• ### List of reviewers for 2013

Publication Year: 2014, Page(s):285 - 290
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• ### Analytical $S$ -Parameter Sensitivity Formula for the Shape Parameters of Dielectric Objects

Publication Year: 2014, Page(s):291 - 293
Cited by:  Papers (1)
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An exact sensitivity expression is proposed for the computation of S-parameter derivatives with respect to the shape parameters of isotropic dielectric objects. While an exact expression has already been developed for the shape parameters of volumetric metallic objects, to our knowledge, the case of dielectric objects has only been treated with approximations. The proposed expression integrates th... View full abstract»

• ### Accurate Formulas for the Capacitance of Tapered-Through Silicon Vias in 3-D ICs

Publication Year: 2014, Page(s):294 - 296
Cited by:  Papers (10)
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This letter first proposes novel formulas for the calculation of the oxide capacitance and the silicon substrate capacitance in Tapered-Through Silicon vias (T-TSVs). The electric field is non-uniform distribution in T-TSVs due to its non-uniform three-dimensional structure. In order to get accurate formulas for the capacitance of T-TSVs, the conformal mapping method was used properly based on the... View full abstract»

• ### A Reconfigurable Bandpass Filter Based on a Varactor-Perturbed, T-Shaped Dual-Mode Resonator

Publication Year: 2014, Page(s):297 - 299
Cited by:  Papers (5)
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A microstrip bandpass filter (BPF) with high center-frequency tunability, bandwidth reconfigurability, and a one-side band edge transmission zero (TZ) is presented. The reconfigurable BPF is developed with a simple T-shaped dual-mode resonator, which is externally coupled and perturbed with varactor diodes. Also, the design of adjustable admittance inverters for tunable resonators external couplin... View full abstract»

• ### Differential Wideband Bandpass Filters With Enhanced Common-Mode Suppression Using Internal Coupling Technique

Publication Year: 2014, Page(s):300 - 302
Cited by:  Papers (12)
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A differential wideband bandpass filter (WBPF) with enhanced common-mode (CM) suppression is presented. The study about this modified branch-line structure with internal coupling sections shows that the proposed filter demonstrates a good wideband bandpass filtering response under the differential mode (DM) operation, meanwhile it also functions as a CM bandstop filter with wide and high rejection... View full abstract»

• ### Asymmetric Ground Rotman Lens for Multilayer Packages

Publication Year: 2014, Page(s):303 - 305
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An asymmetric ground Rotman lens is presented in this letter. A new design of a Rotman lens is proposed to accommodate a whole beamforming system by providing separate ground layers for antennas and circuits. The lens has three dielectric layers and four metallic layers. The prototype of the lens consists of seven array ports, five beam ports, and six dummy ports. The measured return losses show t... View full abstract»

• ### A Novel Compact Butler Matrix Without Phase Shifter

Publication Year: 2014, Page(s):306 - 308
Cited by:  Papers (3)
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A novel compact 4 × 4 Butler matrix using only microstrip couplers and a crossover is proposed in this letter. Compared with the conventional Butler matrix, the proposed one avoids the interconnecting mismatch loss and imbalanced amplitude introduced by the phase shifter. The measurements show accurate phase differences of 45±0.8° and -135±0.9° with an amplitude ... View full abstract»

• ### Microstrip Multiplexer and Switchable Diplexer with Joint T-Shaped Resonators

Publication Year: 2014, Page(s):309 - 311
Cited by:  Papers (3)
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This work presents a four-channel multiplexer that uses joint T-shaped resonators. The multiplexer contains four second-order bandpass filters that are combined by two joint T-shaped resonators. The joint T-shaped resonators are also inherently the resonant elements and frequency selective signal splitter. Therefore, the proposed multiplexer has compact size because of fewer resonators and no matc... View full abstract»

• ### Short-Ended Self-Coupled Ring Resonator and Its Application for Balanced Filter Design

Publication Year: 2014, Page(s):312 - 314
Cited by:  Papers (9)
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Theory and applications of short-ended self-coupled ring resonator (SCRR) are focused in this letter. By periodically and symmetrically placing short-ended SCRRs between the microstrip differential lines, the common-mode (CM) suppression can be achieved at desired frequency easily with wideband unaffected differential-mode (DM) passband. On the basis of controllable center frequency of CM suppress... View full abstract»

• ### New Compact Metamaterial Unit-Cell Using SIR Technique

Publication Year: 2014, Page(s):315 - 317
Cited by:  Papers (7)
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In this letter, a new compact metamaterial unit-cell called SIR-DSR is presented. This unit-cell is designed by applying the stepped-impedance resonator (SIR) technique to a conventional double split-ring resonator (DSR) structure. The S parameters and the extracted effective relative permittivity and permeability for the presented unit-cell show a miniaturization factor of 0.75 compared to a conv... View full abstract»

• ### Design of Microstrip Lossy Filter Using an Extended Doublet Topology

Publication Year: 2014, Page(s):318 - 320
Cited by:  Papers (3)
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A lossy three-pole microstrip bandpass filter using an extended doublet network is proposed in this letter. Nonuniform Q distribution is considered by reducing the Qu of one resonator, resulting in a flatter passband with an enhanced selectivity. Also, the novel feeding network adopted brings about two extra transmission zeros and a wide stopband that further improve the filter performance. Good a... View full abstract»

• ### A Novel Resonant Ground Structure Based on a Cavity-Backed DGS

Publication Year: 2014, Page(s):321 - 323
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In this letter, a new resonant ground structure (RGS) based on a cavity-backed DGS is proposed. The proposed RGS is similar to a DGS and is modeled by a parallel RLC resonance circuit. Since the proposed RGS utilizes a substrate-filled metallic cavity (SFMC) underneath the DGS, it leads to no back-radiation and high quality factor. The frequency responses and structural parameters are analyzed and... View full abstract»

• ### Group Delay Investigation of Rat-Race Coupler Design With Tunable Power Dividing Ratio

Publication Year: 2014, Page(s):324 - 326
Cited by:  Papers (4)
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This letter presents, for the first time, the theoretical and experimental investigation of the group delay characteristics of a rat-race coupler with variable power dividing ratio. By analytically study, the group delays associated with different transmission paths are found to be identical and can be made independent of the power dividing ratio by the proper design of the embedded networks. For ... View full abstract»

• ### Compact Filtering Crossover Using Stub-Loaded Ring Resonator

Publication Year: 2014, Page(s):327 - 329
Cited by:  Papers (9)
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This letter presents a novel compact crossover with bandpass responses. It consists of a stub-loaded ring and coupling feeding structures. The equivalent circuit of each path between two diagonal ports is a filtering circuit. The stub-loaded ring acts as the resonator in both two paths and thus the size is miniaturized. Meandering feeding structures are utilized to realize transmission zeros to im... View full abstract»

• ### Dual-Band Ring Coupler Based on the Composite Right/Left-Handed Folded Substrate-Integrated Waveguide

Publication Year: 2014, Page(s):330 - 332
Cited by:  Papers (6)
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In this letter, a dual-band ring coupler based on the folded substrate-integrated waveguide (FSIW) is proposed. The artificial structure, the composite right/left-handed (CRLH) transmission lines were implemented in the FSIW by loading the interdigital capacitors in the middle metallic layer to generate a left-handed passband region below the cutoff frequency of the ordinary waveguide TE10 mode fo... View full abstract»

• ### Miniaturized Triple-Band Bandpass Filter Using Coupled Lines and Grounded Stepped Impedance Resonators

Publication Year: 2014, Page(s):333 - 335
Cited by:  Papers (19)
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A triple-band bandpass filter with good selectivity based on modified grounded stepped impedance resonators (SIRs) is presented. The fundamental and first higher order resonances of the two λ/4 grounded SIRs are utilized to obtain dual-band response. Moreover, bandwidths of the two passbands can be controlled by tuning the distance between the two grounded vias. Owing to the use of two �... View full abstract»

• ### Miniaturized 180$^{circ}$ Hybrid Coupler in LTCC for L-Band Applications

Publication Year: 2014, Page(s):336 - 338
Cited by:  Papers (1)
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In this letter, the lumped element technique is used to design a 180 ° hybrid coupler or balun for applications at L1 band. The material system employed is low temperature co-fired ceramic (LTCC), which allows for three-dimensional passive integration. The proposed balun uses a modified equivalent circuit that permits the simultaneous optimization of amplitude and phase balances. A process ... View full abstract»

• ### A 19 GHz CMOS Signal Generator for 77 GHz FMCW Radars

Publication Year: 2014, Page(s):339 - 341
Cited by:  Papers (1)
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This letter presents a novel architecture of signal source suitable for the 77 GHz frequency-modulated continuous-wave (FMCW) radar transceiver. By using a conventional 19 GHz integer- N phase-locked loop (PLL) with a frequency modulation loop, the required 19 GHz sinusoidal signal and 19-19.5 GHz FMCW frequency chirp can be generated simultaneously without excessive hardware overhead. Fabricated ... View full abstract»

• ### Single-Ended CMOS Doherty Power Amplifier Using Current Boosting Technique

Publication Year: 2014, Page(s):342 - 344
Cited by:  Papers (8)
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In this letter, an efficiency enhancement technique incorporating a gate-voltage boosting of a peaking power amplifier (PA) in a CMOS Doherty PA is presented. To compensate the current driving capability from the low dc bias point of the peaking cell, an auxiliary bias network consisting of an operational amplifier (OPA) is utilized to provide the corresponding gate voltage in accordance with an i... View full abstract»

• ### Monolithic Single-Pole Sixteen-Throw T/R Switch for Next-Generation Front-End Module

Publication Year: 2014, Page(s):345 - 347
Cited by:  Papers (5)
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A broadband monolithic linear single-pole, sixteen-throw (SP16T) antenna switch has been designed and fabricated in 180 nm thin film SOI CMOS process, which is intended for the next generation multimode multiband (MMMB) cellular applications. The switch features the minimum 0.7 dB and average 1dB insertion loss, 0.1 dB compression point of 29 dBm and at least 33 dB isolation at all cellular bands ... View full abstract»

• ### A 2.4 GHz Ultra-Low-Power Current-Reuse CG-LNA With Active ${\rm G}_{\rm m}$ -Boosting Technique

Publication Year: 2014, Page(s):348 - 350
Cited by:  Papers (4)
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An ultra-low-power common-gate low noise amplifier (CG-LNA) for 2.4 GHz wireless sensor network (WSN) applications is proposed in this letter. The current-reuse and active gm-boosting techniques are utilized. The analysis, design method and measurement results are shown. An implemented prototype using 0.18 μm CMOS technology is evaluated using on-wafer probing. Measurements also show a gain... View full abstract»

• ### Microwave Gas Breakdown in Tunable Evanescent-Mode Cavity Resonators

Publication Year: 2014, Page(s):351 - 353
Cited by:  Papers (6)
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Microwave gas breakdown in strongly-coupled evanescent-mode cavity resonators in atmospheric pressure and room temperature is investigated both numerically and experimentally. This high- Q resonator is widely tunable by changing the gap between its loading post and top wall. In this letter, we study the effect of different gap spacings on breakdown characteristics of this resonator. Good agreement... View full abstract»

• ### Optimal Waveforms for Efficient Wireless Power Transmission

Publication Year: 2014, Page(s):354 - 356
Cited by:  Papers (31)
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This work shows how using specifically selected or designed waveforms in wireless power transfer (WPT) systems can lead to improved RF to dc conversion efficiency in rectifier circuits in the receiving end of these systems. Signals with different time domain waveforms are considered such as OFDM, white noise and chaotic waveforms, and the performance of a rectifier circuit operating at 433 MHz is ... 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