# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 27

Publication Year: 2008, Page(s):C1 - C4
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• ### IEEE Microwave and Wireless Components Letters publication information

Publication Year: 2008, Page(s): C2
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• ### Anisotropic-Medium PML for ADI-BOR-FDTD Method

Publication Year: 2008, Page(s):221 - 223
Cited by:  Papers (5)
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Anisotropic medium perfectly matched layer formulations are presented to truncate the alternating-direction implicit finite-difference time-domain grids for bodies of revolution. The validity of the proposed formulations is shown through a numerical example of scattering from a perfectly electrically conducting cylinder. View full abstract»

• ### An Unconditionally Stable Split-Step FDTD Method for Low Anisotropy

Publication Year: 2008, Page(s):224 - 226
Cited by:  Papers (11)
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Split-step unconditionally stable finite-difference time-domain (FDTD) methods have higher dispersion and anisotropic errors for large stability factors. A new split-step method with four sub-steps is introduced and shown to have much lower anisotropy compared with the well known alternating direction implicit finite-difference time-domain (ADI-FDTD) and other known split step methods. Another imp... View full abstract»

• ### High-Order Passive Delay-Based Macromodel for MTLs via Symplectic Integrators

Publication Year: 2008, Page(s):227 - 229
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This letter introduces a new approach to obtain passive delay-based macromodels for lossy multiconductor transmission lines. The proposed approach uses the notion of symplectic integrators to obtain fourth-order passive approximations to the exponential matrix with delay extraction. This approach can therefore be considered a generalization to previous delay-extraction-based techniques which adopt... View full abstract»

• ### Modeling the Broadband Inductive and Resistive Behavior of Composite Conductors

Publication Year: 2008, Page(s):230 - 232
Cited by:  Papers (9)
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Accurately modeling interconnect structures is an important issue in high-frequency chip design. Conductors have a finite thickness and conductivity, and are often composed of different metals. It is shown that the Dirichlet-to-Neumann technique can be used to model the inductive and resistive behavior of such structures, up to high frequencies at which the skin effect is well-developed. Furthermo... View full abstract»

• ### Metamaterial Blueprints for Reflectionless Waveguide Bends

Publication Year: 2008, Page(s):233 - 235
Cited by:  Papers (52)
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A derivation of metamaterial blueprints for the reflectionless (perfectly matched) guiding of electromagnetic waves through waveguide bends is performed. The sensitivity of the response with respect to small perturbations in the associated constitutive tensors is examined. View full abstract»

• ### Holography-Inspired Screens for Sub-Wavelength Focusing in the Near Field

Publication Year: 2008, Page(s):236 - 238
Cited by:  Papers (41)  |  Patents (1)
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Inspired by the principle of holography we present a concept for making simple transmission screens that can focus an incident wave into a sub-wavelength spot in the near field. The screen is made out of closely spaced, unequal slits cut on a metallic sheet. Fullwave simulations are presented for an example screen that focuses an incident plane wave down to a spot having a peak-to-null beamwidth e... View full abstract»

• ### Resonant Frequencies of Circular Substrate Integrated Resonators

Publication Year: 2008, Page(s):239 - 241
Cited by:  Papers (11)
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In this letter, the characterization of circular resonators realized in substrate integrated waveguide technology is presented. Resonances are found by setting up the equations of the scattering for an ensemble of metallic posts in parallel plates waveguide and considering the nontrivial solution to the corresponding homogeneous problem. Resonant frequencies are then located by means of an efficie... View full abstract»

• ### A Novel Electrically Tunable RF Inductor With Ultra-Low Power Consumption

Publication Year: 2008, Page(s):242 - 244
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In this study, we propose for the first time an electrically and continuously tunable RF inductor using grounded metal oxide semiconductor (MOS) transistor as a control device. By adjusting the output resistance of the grounded MOSFET, the ground-return current can lead to a significant variation in series inductance. This proposed inductor structure was implemented in a standard CMOS process and ... View full abstract»

• ### Controlling the Bandwidth of Split Ring Resonators

Publication Year: 2008, Page(s):245 - 247
Cited by:  Papers (16)
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A method to control the half-power relative band- widths of split ring resonators (SRRs) coupled to a transmission-line system is presented. An equivalent circuit model is proposed to analyze the main factors that effect the relative band- widths of SRRs. Based on the analysis, we propose an efficient way to control the relative bandwidth of SRR, which has been verified by both full-wave simulatio... View full abstract»

• ### An Embedded Common-Mode Suppression Filter for GHz Differential Signals Using Periodic Defected Ground Plane

Publication Year: 2008, Page(s):248 - 250
Cited by:  Papers (110)  |  Patents (4)
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A novel low-cost filter design for common-mode noise suppression in high-speed differential signals is proposed. It is realized by periodically etching the dumbbell-shape defected ground structure (DGS) to perturb the return current of the common- mode noise. A transmission-line model for the proposed structure is also developed with good agreement to the full-wave simulation and measurement resul... View full abstract»

• ### The Design of Coupled Resonator Bandpass Filter With Wide Stop-Band

Publication Year: 2008, Page(s):251 - 253
Cited by:  Papers (8)
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A compact four-pole bandpass filter with multi-order spurious response suppression is proposed. The combination of dissimilar resonator structures with the same fundamental frequency but with different spurious frequencies may improve the stop-band rejection by the mutual cancellation of spurious responses. The measured results show that better than -20 dB rejection levels in the stop-band up to 4... View full abstract»

• ### Compact Electronically Switchable Parallel-Coupled Microstrip Bandpass Filter With Wide Stopband

Publication Year: 2008, Page(s):254 - 256
Cited by:  Papers (21)
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In this letter, a compact electronically switchable parallel-coupled microstrip bandpass filter (BPF) based on quarter- wavelength resonators and p-i-n diode switch is proposed. The proposed filter occupies only half the circuit size of the conventional parallel-coupled filter. In addition, the type and length of each coupled-line section is suitably chosen such that the inherent transmission zero... View full abstract»

• ### A Microstrip Resonator With Slotted Ground Plane for Complex Permittivity Measurements of Liquids

Publication Year: 2008, Page(s):257 - 259
Cited by:  Papers (16)  |  Patents (2)
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A novel microstrip resonator is designed to measure complex permittivities of liquids with medium loss. The enclosed resonator is based on a lambda/2 open-circuit microstrip line with a slot in the ground plane. It is immersed into the liquid under test to measure the S-parameter from 2.2 to 2.6 GHz. The complex permittivities of binary liquid mixtures of methanol and ethanol are reconstructed fro... View full abstract»

• ### Dosimetry Evaluation for Pregnant and Fetus Rats in a Near-Field Exposure System of 1.95-GHz Cellular Phones

Publication Year: 2008, Page(s):260 - 262
Cited by:  Papers (5)
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In this letter, the dosimetry for pregnant rats and their fetuses in an in vivo exposure setup is conducted by using the finite-difference time-domain method in conjunction with anatomically based pregnant rat models. The exposure setup has been developed for testing possible indirect biological effects on fetuses when the pregnant rats are exposed to 1.95-GHz digital cellular phones. As a result,... View full abstract»

• ### On The Sensitivity of RF Transmitters' Memory Polynomial Model Identification to Delay Alignment Resolution

Publication Year: 2008, Page(s):263 - 265
Cited by:  Papers (6)  |  Patents (2)
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In this letter, the effects of delay alignment between the input and output baseband waveforms on the performance of a radio frequency transmitters' memory polynomial based model are studied. A 100-W average power transmitter is characterized; various delay values are applied to align the input and output data; and, a model is derived for each delay value. The models' performances, evaluated for t... View full abstract»

• ### High Efficiency RF Power Amplifier Designed With Harmonic Real-Time Active Load-Pull

Publication Year: 2008, Page(s):266 - 268
Cited by:  Papers (8)
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In this work, a high efficiency p-HEMT radio frequency power amplifier (PA) is designed using a new multiharmonic real-time active load-pull using the large signal network analyzer. This technique synthesizes a large set of instantaneous load mismatches to quickly find the optimal harmonic impedances, so as to achieve high PA efficiency in a shortened design cycle. At 2 GHz a demo power amplifier ... View full abstract»

• ### Improvement of Return Loss Bandwidth of Balanced Amplifier Using Metamaterial-Based Quadrature Power Splitters

Publication Year: 2008, Page(s):269 - 271
Cited by:  Papers (13)
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A new balanced amplifier (BA) using metamaterial-based quadrature power splitters (QPSs) is presented in this letter. Instead of using conventional 90 couplers, the developed BA is implemented by two parallel amplifiers with broadband metamaterial-based QPSs at input and output ends. Since the QPSs can provide a broadband quadrature phase difference between two outputs, the input/output reflection... View full abstract»

• ### Ka-Band SiGe HBT Low Phase Imbalance Differential 3-Bit Variable Gain LNA

Publication Year: 2008, Page(s):272 - 274
Cited by:  Papers (19)
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This letter presents the design and implementation of a differential Ka-band variable gain low noise amplifier (VG-LNA) with low insertion phase imbalance. The VG-LNA is based on a 0.12 mum SiGe heterojunction bipolar transistor process, and the gain variation is achieved using bias current steering. The measured VG-LNA gain at 32-34 GHz is 9-20 dB with eight different linear-in-magnitude gain sta... View full abstract»

• ### A 25–75 GHz Miniature Double Balanced Frequency Doubler in 0.18-$mu$m CMOS Technology

Publication Year: 2008, Page(s):275 - 277
Cited by:  Papers (16)
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A 25-75 GHz compact double balanced frequency doubler fabricated in standard 0.18-mum CMOS process is demonstrated. The resistive doubler is composed of two identical asymmetric broadside-coupled baluns, and a quad GS-connected diode. The fabricated doubler achieves a radio frequency bandwidth from 25 to 75 GHz with a maximum output power better than +3 dBm; the fundamental signal rejection is ran... View full abstract»

• ### A 21 GHz Complementary Transformer Coupled CMOS VCO

Publication Year: 2008, Page(s):278 - 280
Cited by:  Papers (37)  |  Patents (3)
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A new topology for low power voltage controlled oscillators (VCOs) using a 0.18-mum CMOS foundry process is presented in this letter. From the measured results, the VCO exhibits a tuning range of 3% at 21.3 GHz. Using complementary topology, the core power consumption and the output power are 9.6 mW and -3 dBm, respectively. With the broadside coupled transformer, the VCO achieves a good phase noi... View full abstract»

• ### Demonstration of 184 and 255-GHz Amplifiers Using InP HBT Technology

Publication Year: 2008, Page(s):281 - 283
Cited by:  Papers (17)
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In this letter, 184 and 255 GHz single-stage heterojunction bipolar transistor (HBT) amplifiers are reported. Each amplifier uses a single-emitter 0.4 ??m 15 ??m InP HBT device with maximum frequency of oscillation (fmax) greater than 500 GHz and of 200 GHz. The 183 GHz single-stage amplifier has demonstrated gain of 4.3 ?? 0.4 dB for all sites on the wafer. The 255 GHz amplifier has me... View full abstract»

• ### A 220 GHz Single-Chip Receiver MMIC With Integrated Antenna

Publication Year: 2008, Page(s):284 - 286
Cited by:  Papers (33)
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This letter presents the design and characterization of a 220 GHz microstrip single-chip receiver monolithic microwave integrated circuit (MMIC) with an integrated antenna in a 0.1 mum GaAs metamorphic high electron mobility transistor technology. The receiver MMIC consists of a novel slot-square substrate lens feed antenna, a three-stage low noise amplifier, and a sub-harmonically pumped resistiv... View full abstract»

• ### A V-Band Beam-Steering Antenna on a Thin-Film Substrate With a Flip-Chip Interconnection

Publication Year: 2008, Page(s):287 - 289
Cited by:  Papers (17)
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We propose a planar V-band beam-steering antenna based on a millimeter-wave (mm-wave) system-on-package technology using advanced thin-film technology on a silicon mother board. The thin-film substrate has the capability of integrated passive elements and flip-chip interconnection. Space-consuming components such as a microstrip Rotman lens and patch antennas are implemented on a low-loss, low-cos... 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