# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 33

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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• ### Envelope LOD Wave Equation PML Algorithm for Dispersive Band-Limited FDTD Applications

Publication Year: 2008, Page(s):293 - 295
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Unconditionally stable envelope scalar wave equation perfectly matched layer algorithm is presented for truncating dispersive finite difference time domain (FDTD) grids. The algorithm is based on the locally one dimensional FDTD formulations and it is suitable for band-limited electromagnetic applications. Two-dimensional numerical examples are included to show the validity of the proposed formula... View full abstract»

• ### ADI-FDTD Method With Fourth Order Accuracy in Time

Publication Year: 2008, Page(s):296 - 298
Cited by:  Papers (10)
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This letter presents an unconditionally stable alternating direction implicit finite-difference time-domain (ADI-FDTD) method with fourth order accuracy in time. Analytical proof of unconditional stability and detailed analysis of numerical dispersion are presented. Compared to second order ADI-FDTD and six-steps SS-FDTD, the fourth order ADI-FDTD generally achieves lower phase velocity error for ... View full abstract»

• ### Minimizing Electromagnetic Scattering by Varying Height of Metallic Surfaces

Publication Year: 2008, Page(s):299 - 301
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This letter determines the dimensional profile of a periodic metallic surface that minimizes the electromagnetic energy scattering of an incident plane-wave back in the incident direction, irrespective of the plane-wave incidence angle. Simple Fourier series is used to describe the surface height variation and it is shown that a small number of design parameters are required to obtain the optimal ... View full abstract»

• ### New Reference Function for Post-Processing Uncertainty Evaluation in SAR Compliance Tests

Publication Year: 2008, Page(s):302 - 304
Cited by:  Papers (1)
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A reference function for the post-processing uncertainty evaluation in specific absorption rate (SAR) compliance tests is proposed. The new reference function, derived from real SAR distributions measured during compliance sessions of handsets, is characterised by a double Gaussian distribution with asymmetrical standard deviation parameters, in each half space. Standard deviation parameters as we... View full abstract»

• ### Frozen Modes in Coupled Microstrip Lines Printed on Ferromagnetic Substrates

Publication Year: 2008, Page(s):305 - 307
Cited by:  Papers (21)
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A microstrip transmission line model is proposed for magnetic photonic crystals having a stationary inflection point in their dispersion diagrams. The model is formed from an existing degenerate band edge microstrip circuit by replacing the substrate material with a properly biased ferrite. Using the four port unit cell's transfer matrix, we calculate the dispersion diagram of the periodic structu... View full abstract»

• ### Realization and Experimental Verification of Chiral Cascaded Circuit

Publication Year: 2008, Page(s):308 - 310
Cited by:  Papers (2)
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In this letter, we present an implementation for the previously proposed chiral cascaded circuit (CCC) using lumped capacitors, inductors, and transformers. The design of a 180/0deg four-port coupler with one-unit-cell CCC is then presented. Both simulation and experimental results show that such a coupler with identical load at four ports behaves as an analogue to an isotropic chiral slab residin... View full abstract»

• ### An In-Line Waveguide-to-Microstrip Transition Using Radial-Shaped Probe

Publication Year: 2008, Page(s):311 - 313
Cited by:  Papers (23)  |  Patents (1)
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In this letter, an in-line waveguide-to-microstrip transition at Ka-band is presented. It utilizes a radial-shaped probe a quarter-wavelength away from the waveguide short-back, which is also used as a support for the microstrip substrate, to terminate the TE10 mode of the standard waveguide. This printed structure is easy to fabricate and convenient to be installed in the waveguide cav... View full abstract»

• ### Tunable Filters With Nonuniform Microstrip Coupled Lines

Publication Year: 2008, Page(s):314 - 316
Cited by:  Papers (16)  |  Patents (4)
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A basic wideband tunable filter design based on combline topology is presented. At the presence of the parasitic effects, the structure of the filter must be modified by introducing additional degrees of freedom to the geometry of the coupled line segment. A design procedure involving iterative steps will be described. This procedure is used to design two bandpass filters with more than one octave... View full abstract»

• ### Two-Cavity Filter With Three Transmission Zeros

Publication Year: 2008, Page(s):317 - 319
Cited by:  Papers (7)
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It is well known that an N-order coupling network with source-load coupling can realize a maximum number of transmission zeros equal to N. However, in the letter, by utilizing open-circuited stubs and increasing the velocity ratio, a novel two-pole hairpin filter can obtain three transmission zeros, which can improve selectivity in the lower stopband. The filter is analyzed extensively by using th... View full abstract»

• ### A Compact Dual-Band Bandpass Filter Using Meandering Stepped Impedance Resonators

Publication Year: 2008, Page(s):320 - 322
Cited by:  Papers (57)
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This letter presents a miniaturized dual-band narrow bandpass filter (BPF) using meandering stepped impedance resonators (SIRs) with a new coupling scheme, which exhibited a size reduction of 50% compared with the traditional direct coupling structure at the same frequency, while the new structure can generate three transmission zeros in the insertion loss response. To validate the design and anal... View full abstract»

• ### Effect of Printed Circuit Board Structures on Temperature-Dependent Gain Characteristics of RF Power Amplifier Chips

Publication Year: 2008, Page(s):323 - 325
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We fabricated and characterized heterojunction field effect transistor radio frequency (RF) power amplifier (PA) test fixtures, for wireless applications, with various printed circuit board (PCB) structures. The RF matching and bias circuits of the test fixtures were designed so that they had the same RF characteristics. The only source of the variation of the RF gain (S21) was differen... View full abstract»

• ### An Original Demonstration of the $T_{min}/T_{o}leq 4N$ Inequality for Noisy Two-Port Networks

Publication Year: 2008, Page(s):326 - 328
Cited by:  Papers (6)  |  Patents (1)
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The inequality Tmin/T0 les 4N for any noisy linear two-port network is completely demonstrated for the first time. A graphical interpretation to link the Lange invariant N to the minimum noise performance Tmin or Fmin is also presented. A new term DeltaN is defined and demonstrated to be invariant to lossless transformations. Its sign is important for th... View full abstract»

• ### Deep Submicron CMOS for Millimeter Wave Power Applications

Publication Year: 2008, Page(s):329 - 331
Cited by:  Papers (2)
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This letter gives an early assessment of deep submicron planar bulk CMOS devices for millimeter wave power amplifier (PA) applications. Using load pull measurements, a record high power density of 100 mW/mm and a transducer gain of 7 dB at 35 GHz were achieved for a 40 nm physical gate length CMOS device with a total gate width of 192 mum. Furthermore a peak PAE of 33% was reached. This shows that... View full abstract»

• ### Linearity Improvement of a Power Amplifier Using a Series LC Resonant Circuit

Publication Year: 2008, Page(s):332 - 334
Cited by:  Papers (2)
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A radio frequency power amplifier microwave monolithic integrated circuit with a series LC resonant circuit as well as a bias control circuit for wide-band code division multiple access application is presented. The linearizer that consists of a series LC resonant circuit and base-emitter junction of a bias transistor operates as a diode rectifier circuit. A comparison between the circuits with an... View full abstract»

• ### A Double-Sided Parallel-Strip Line Push–Pull Oscillator

Publication Year: 2008, Page(s):335 - 337
Cited by:  Papers (11)
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A novel double-sided parallel-strip line (DSPSL) push-pull oscillator using two identical sub-oscillators on the opposite sides of a dielectric substrate is proposed. The two sub-oscillators, sharing a common DSPSL resonator and common ground in the middle of the substrate, generate out-of-phase fundamental signals and in-phase second harmonics. At the common DSPSL output, the second harmonics are... View full abstract»

• ### 5-GHz Low Phase-Noise CMOS VCO Integrated With a Micromachined Switchable Differential Inductor

Publication Year: 2008, Page(s):338 - 340
Cited by:  Papers (4)  |  Patents (5)
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A 5-GHz CMOS voltage-controlled oscillator (VCO) integrated with a micromachined switchable differential inductor is reported in a 0.18 mum radio frequency-CMOS-based microelectromechanical system technology. The power consumption of the core is about 8 mW at the supply voltage of 1.8 V. A total tuning range of 470 MHz (from 5.13 GHz to 5.60 GHz) is achieved as the tuning voltage ranging from 0 V ... View full abstract»

• ### A 48 GHz 196 dB-FOM LC VCO With Double Cap-Degeneration Negative-Resistance Cell

Publication Year: 2008, Page(s):341 - 343
Cited by:  Papers (1)
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This letter presents a 48-GHz capacitively emitter-degenerated LC voltage controlled oscillator (VCO) with double cross-coupled pair showing higher and lower input capacitance than typical cross-coupled pairs. The phase noise of the proposed LC VCO is measured as 114.5 dBc/Hz at 1 MHz offset from 48 GHz carrier, and a current of 6 mA is drawn in the VCO circuit. The proposed VCO shows an excellent... View full abstract»

• ### A 50 GHz Divide-by-4 Injection Lock Frequency Divider Using Matching Method

Publication Year: 2008, Page(s):344 - 346
Cited by:  Papers (24)
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A fully integrated divide-by-4 frequency divider has been designed, fabricated, and measured in the standard bulk 0.18-m complementary metal-oxide semiconductor (CMOS) technology. A newly proposed matching technique was used to eliminate the unwanted low frequency mixing terms at the common node of the circuit so as to achieve a high division ratio of 4. The frequency divider exhibits a measured o... View full abstract»

• ### Nonlinear Optimization of Wide-Band Harmonic Self-Oscillating Mixers

Publication Year: 2008, Page(s):347 - 349
Cited by:  Papers (10)
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A new optimization method is presented for the design of wide-band harmonic self-oscillating mixers (HSOMs). High conversion gain is obtained through near-bifurcation operation and optimization of the harmonic content of the self-oscillation. Bifurcation analysis- and control-techniques are used in combination with nonlinear optimization techniques based on the use of an auxiliary generator. An 11... View full abstract»

• ### A New Linearization Technique for CMOS RF Mixer Using Third-Order Transconductance Cancellation

Publication Year: 2008, Page(s):350 - 352
Cited by:  Papers (39)
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A new third-order transconductance (gm3) cancellation technique is proposed and applied to a conventional radio frequency (RF) mixer for improving circuit linearity. The bulk-to- source voltage is applied to adjust the peak value position of gms. The cancellation of gm3 is utilized by a negative peak gm3 transistor combined in parallel with a positive peak gm3... View full abstract»

• ### A Combined 380 GHz Mixer/Doubler Circuit Based on Planar Schottky Diodes

Publication Year: 2008, Page(s):353 - 355
Cited by:  Papers (21)
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The design, fabrication and test of a combined sub-millimeter wave mixer/doubler featuring a 380 GHz sub-harmonic mixer and a 190 GHz frequency doubler on a single quartz based microstrip circuit is reported in this letter. The integrated circuit uses separate flip-chip mounted planar Schottky diode components to perform the two functions. Measurements give best double sideband mixer noise tempera... View full abstract»

• ### Adaptive Arbitrary Pulse Shaper

Publication Year: 2008, Page(s):356 - 358
Cited by:  Papers (7)
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A simple, yet effective, ultra wideband pulse shaping circuit architecture is presented. The circuit enables generation of an arbitrary pulse based on in-time superposition of the excitation waveform. The proposed system addresses problems associated with spectrum management, pulse reception and equalization. The pulse shaper was implemented in planar microstrip technology to provide a fully varia... View full abstract»

• ### A Compact Envelope-Memory Polynomial for RF Transmitters Modeling With Application to Baseband and RF-Digital Predistortion

Publication Year: 2008, Page(s):359 - 361
Cited by:  Papers (64)  |  Patents (1)
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In this letter, a compact envelope-memory polynomial based model, suitable for forward and reverse modeling of weakly nonlinear wireless transmitters and power amplifiers (PAs) exhibiting electrical memory effects, is presented. This model is implemented in a complex gain based architecture and takes advantage of the dependency of PA nonlinearity on the magnitude of the input signal. Contrary to c... 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