# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 27

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
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• ### Trade-Offs for Unconditional Stability in the Finite-Element Time-Domain Method

Publication Year: 2014, Page(s):361 - 363
Cited by:  Papers (2)
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We discuss basic trade-offs in the application of unconditionally-stable time-updating schemes for the finite-element time-domain solution of Maxwell's equations. Particular attention is given to the case of large Courant-Friedrichs-Lewy number, where the conventional thought holds that unconditionally stable schemes provide marked advantage over conditionally stable ones. View full abstract»

• ### Rapid EM-Driven Design of Compact RF Circuits By Means of Nested Space Mapping

Publication Year: 2014, Page(s):364 - 366
Cited by:  Papers (30)
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A methodology for rapid design of RF circuits constituted by compact microstrip resonant-cells (CMRCs) is presented. Our approach exploits nested space mapping (NSM) technology, where the inner SM layer is used to correct the equivalent circuit model at the CMRC level, whereas the outer layer enhances the coarse model of the entire structure under design. We demonstrate that NSM dramatically impro... View full abstract»

• ### Miniaturized Ultra-Wideband Bandpass Filter Using Bridged-T Coil

Publication Year: 2014, Page(s):367 - 369
Cited by:  Papers (6)
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In this letter, a miniaturized ultra-wideband bandpass filter based on thin-film integrated passive device process is proposed. The multi-mode resonator is adopted to achieve a wide bandwidth from 3.1 to 10.6 GHz. By using the bridged-T coil to replace the transmission line of multi-mode resonator, the circuit size is largely reduced while the multi-mode property can be retained. The filter size w... View full abstract»

• ### Phase Property of Central-Symmetric Four-Ports Applied to Quadrature Directional Coupler Design in Asymmetric Coupled-Line Technology

Publication Year: 2014, Page(s):370 - 372
Cited by:  Papers (1)
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Properties of ideally matched lossless four-port networks having central symmetry have been investigated. It has been shown that such networks feature ideal quadrature differential phase characteristics. It is shown that this unique property can be utilized for phase improvement of asymmetric coupled-line directional couplers. The presented theoretical investigation has been proven by measurements... View full abstract»

• ### Switchable and High-Isolation Diplexer With Wide Stopband

Publication Year: 2014, Page(s):373 - 375
Cited by:  Papers (9)
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This letter presents a switchable diplexer composed of a stepped-impedance distributed coupling feeding line, four different quarter-wavelength stepped-impedance resonators (SIRs), two shunt open stubs, two p-i-n diodes, and bias circuitry. Compared with previous works, the proposed circuit features compactness, wide stopband, high selectivity, and independently switchable channels. To suppress ha... View full abstract»

• ### Reduced-Length Two-Section Directional Couplers Designed as Coupled-Line Sections Connected With the Use of Uncoupled Lines

Publication Year: 2014, Page(s):376 - 378
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Broadband coupled-line directional couplers having the properties of two-section coupled-line directional couplers are proposed. The presented couplers are composed of two-coupled line sections having the same coupling coefficient which are connected with the use of two sections of uncoupled transmission lines. It is shown that in such a structure it is possible to achieve an equal-ripple coupling... View full abstract»

• ### Dual-Band Substrate Integrated Waveguide Balun Bandpass Filter With High Selectivity

Publication Year: 2014, Page(s):379 - 381
Cited by:  Papers (23)
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A new method of designing a dual-band balun bandpass filter (BPF) with high selectivity is proposed and implemented by taking advantage of the existence of multiple substrate integrated waveguide (SIW) cavity modes. The major design concept applied in this letter is based on two mechanisms: one is by properly placing the output ports to achieve the balanced output for both passbands, and the other... View full abstract»

• ### A Lumped-Element Directional Coupler With High Isolation for Mobile RFID Reader

Publication Year: 2014, Page(s):382 - 384
Cited by:  Papers (7)
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A lumped-element directional coupler with a high isolation characteristic for mobile RFID reader systems is proposed and experimentally demonstrated. Compared with the conventional lumped-element circuit, the proposed structure utilizes compensation capacitors and achieves a very high isolation despite low quality factor on-chip inductors. It was fabricated on a high-resistivity silicon substrate ... View full abstract»

• ### Compact and High-Isolation Diplexer Using Dual-Mode Stub-Loaded Resonators

Publication Year: 2014, Page(s):385 - 387
Cited by:  Papers (42)
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A novel compact microstrip diplexer for UMTS and WCDMA system is proposed in this letter. The diplexer is mainly composed of three dual-mode stub-loaded microstrip resonators. Two resonant modes of a stub-loaded resonator work together with one mode produced by the common stub-loaded resonator to form a passband or operating band of the proposed diplexer. Extensive study is then conducted on coupl... View full abstract»

• ### A Harmonic Suppressed Bandpass Filter and its Application in Diplexer

Publication Year: 2014, Page(s):388 - 390
Cited by:  Papers (4)
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A multilayer bandpass filter (BPF) with harmonic suppression using meander line inductor and interdigital capacitor (MLI-IDC) resonant structure is presented in this letter. The BPF is fabricated with three unit cells and its measured passband center frequency is 2.56 GHz with a bandwidth of 0.38 GHz and an insertion loss of 1.5 dB. The harmonics are suppressed up to 11 GHz. A diplexer using the p... View full abstract»

• ### Balance-Compensated Asymmetric Marchand Baluns on Silicon for MMICs

Publication Year: 2014, Page(s):391 - 393
Cited by:  Papers (2)
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The balance compensating techniques for asymmetric Marchand balun are presented in this letter. The amplitude and phase difference are characterized explicitly by S21 and S31, from which the factors responsible for the balance compensating are determined. Finally, two asymmetric Marchand baluns, which have normal and enhanced balance compensation, respectively, are designed a... View full abstract»

• ### Small-Versus Large-Signal Extraction of Charge Models of Microwave FETs

Publication Year: 2014, Page(s):394 - 396
Cited by:  Papers (5)
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In this letter we extract the parameters of the charge equations of a microwave transistor nonlinear model which is available in commercial CAD tools. In particular, the charge model parameters are extracted starting from small- and large-signal measurements. A better accuracy can be achieved when using large-signal measurements since the model parameters are obtained from experimental data which ... View full abstract»

• ### Design of A Push-Push and Push-Pull Oscillator Based on SIW/SICL Technique

Publication Year: 2014, Page(s):397 - 399
Cited by:  Papers (7)
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In this letter, the design of a Push-Push and Push-Pull oscillator based on substrate integrated waveguide (SIW) and substrate integrated coaxial line (SICL) technique is presented. Differential-phase lock of the sub-oscillators is realized with the SIW cavity at fundamental TE110 mode, thus simplifying the oscillator design procedure. Based on the SIW and SICL technique, a broadband ma... View full abstract»

• ### A Low-Loss and High Isolation D-Band SPDT Switch Utilizing Deep-Saturated SiGe HBTs

Publication Year: 2014, Page(s):400 - 402
Cited by:  Papers (11)
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A single-pole double-throw switch, utilizing double-shunt, deep-saturated HBTs is implemented in a 0.13 μm SiGe BiCMOS technology, occupying 0.36 mm2 of IC area. A superior switch performance is identified when HBTs are operated in saturation regime, and state of the art performance is achieved at D-band frequencies from 96 to 163 GHz. Measurements show a minimum insertion loss o... View full abstract»

• ### Input Balun Embedded Low-Noise Amplifier With a Differential Structure

Publication Year: 2014, Page(s):403 - 405
Cited by:  Papers (1)
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In this study, we designed a 5 GHz low-noise amplifier (LNA) with a differential structure using 0.18 μm RFCMOS technology. An input balun is embedded into the LNA to enhance the gain, minimize the noise figure (NF), and miniaturize the overall chip size. The NF is minimized because the loss induced by the passive balun is removed. The first stage of the designed LNA performs the activities... View full abstract»

• ### A CMOS Envelope-Tracking Transmitter With an On-Chip Common-Gate Voltage Modulation Linearizer

Publication Year: 2014, Page(s):406 - 408
Cited by:  Papers (8)
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This letter presents a fully integrated CMOS envelope-tracking transmitter with an on-chip common-gate voltage modulation linearizer that achieves an average output power of 26/23.5 dBm with a PAE of 33/28%, an ACLR of -33 / -32.5 dBc at a frequency of 1.9 GHz for 3.84 MHz BW 3.5 dB PAPR WCDMA and 5 MHz BW 7.5 dB PAPR LTE signals in an 0.18-μm CMOS process. The CMOS ET transmitter is integr... View full abstract»

• ### Dual-Band GaN MMIC Power Amplifier for Microwave Backhaul Applications

Publication Year: 2014, Page(s):409 - 411
Cited by:  Papers (2)
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Design and characterization of a dual-band (7 GHz and 15 GHz) MMIC GaN linear Power Amplifier are presented. The amplifier, suitable for point-to-point microwave backhaul applications, exploits a TriQuint GaN foundry process. Large signal measurements exhibit power gain higher than 10 dB and 7 dB in the lower and higher bands respectively, and saturated output power of 34.7 dBm, in a 15% band arou... View full abstract»

• ### Low Phase Noise GaN HEMT Oscillators With Excellent Figures of Merit

Publication Year: 2014, Page(s):412 - 414
Cited by:  Papers (5)
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This letter presents guidelines for the design of low phase noise oscillators in GaN high electron mobility transistor (HEMT) technology. The design starts from bias-dependent low-frequency (LF) noise measurements. Oscillator topology and bias point are then chosen for operation in regions where LF noise is low. The best LF noise properties are obtained for low drain voltage and current. Thus, the... View full abstract»

• ### Absorptive Limiter for Frequency-Selective Circuits

Publication Year: 2014, Page(s):415 - 417
Cited by:  Papers (4)
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This letter describes a novel absorptive limiter for frequency-selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into channelizing devices, such as hybrid-coupled input multiplexers. A preliminary prototype with shunt PIN diodes has been fabricated and measured to demonstrate the viability of th... View full abstract»

• ### $G_{m}$ -Boosted Complementary Current-Reuse Colpitts VCO With Low Power and Low Phase Noise

Publication Year: 2014, Page(s):418 - 420
Cited by:  Papers (5)
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In this letter, a transformer-based current-reuse Colpitts voltage controlled oscillator (VCO) is proposed, which combines a N-type and P-type Colpitts oscillators using a 5-port transformer in a complementary form to provide the differential outputs. The proposed VCO has low phase noise due to the low noise Colpitts oscillator topology and the negative-Gm boosting technique with half of the DC-cu... View full abstract»

• ### A Graphical Aid for the Complex Permittivity Measurement at Microwave and Millimeter Wavelengths

Publication Year: 2014, Page(s):421 - 423
Cited by:  Papers (6)
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We introduce a novel procedure to retrieve the complex permittivity ϵ'-jϵ' of dielectric materials. It is a variant of the well-known waveguide method, and uses as input the one-port reflection data from a vector network analyzer connected to a short-circuited rectangular waveguide filled with a dielectric sample of known length. Here, it is shown that for low t... View full abstract»

• ### 500 MHz OOK Transmitter With 22 pj/bit, 38.4% Efficiency Using RF Current Combining

Publication Year: 2014, Page(s):424 - 426
Cited by:  Papers (1)
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A 500 MHz On-Off Keying (OOK) transmitter integrated with a high-efficiency wideband power amplifier (PA) is designed for low-power/high-data rate applications. The PA biased in Class C region, employs a bias current-reused and an RF current-combining structure to achieve a high-efficiency and high-data rate. The transmitter is fabricated using a 0.13 μm CMOS process. The chip size is 0.6 m... View full abstract»

• ### SU-8 2000 Millimeter Wave Material Characterization

Publication Year: 2014, Page(s):427 - 429
Cited by:  Papers (5)
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SU-8 2000 is an epoxy based photoresist widely used in the fabrication of MEMS for its thick film capability. SU-8 also holds promise as a low cost material for millimeter wave packaging and devices where thick films are required. This letter investigates the electrical material properties of SU-8 2000 at frequencies beyond 140 GHz. Characterization using microstrip ring and T resonators reveal a ... 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