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# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 21 of 21

Publication Year: 2011, Page(s):C1 - C4
| PDF (39 KB)
• ### IEEE Microwave and Wireless Components Letters publication information

Publication Year: 2011, Page(s): C2
| PDF (44 KB)
• ### Frequency-Dependent Substrate Characterization via an Iterative Pole Search Algorithm

Publication Year: 2011, Page(s):173 - 175
| | PDF (293 KB) | HTML

The characterization of frequency-dependent material properties is an important issue in nowadays high-speed interconnect design. This letter presents a practical method to determine the complex permittivity of a substrate material, by combining measurements with simulations. A rational permittivity model is determined by searching for its poles and residues using an iterative optimization method.... View full abstract»

• ### Extending the Stability Limit of the FDTD Method With Spatial Filtering

Publication Year: 2011, Page(s):176 - 178
Cited by:  Papers (14)
| | PDF (320 KB) | HTML

It is shown that the well-known Courant stability limit of the finite-difference time-domain (FDTD) method can be controlled and extended by filtering out unstable spatial harmonics that develop when the time-step is chosen to exceed this limit. The formulation of a spatially filtered FDTD algorithm is accompanied by a numerical benchmarking study that includes cavity resonator and backward wave m... View full abstract»

• ### Application of the Modal CFS-PML-FDTD to the Analysis of Magnetic Photonic Crystal Waveguides

Publication Year: 2011, Page(s):179 - 181
Cited by:  Papers (10)
| | PDF (200 KB) | HTML

We develop a modal finite-difference time-domain (FDTD) method with a complex-frequency-shifted (CFS) perfectly matched layer (PML) to analyze magnetic photonic crystal (MPhC) waveguides. MPhCs are periodic structures with unit cell composed of two misaligned anisotropic dielectric layers and one ferromagnetic layer. Numerical results show that the proposed modal FDTD can reduce both memory and CP... View full abstract»

• ### A Novel Unequal Power Divider Design With Dual-Harmonic Rejection and Simple Structure

Publication Year: 2011, Page(s):182 - 184
Cited by:  Papers (6)
| | PDF (723 KB) | HTML

This letter presents, for the first time, a novel design of unequal power divider with dual-harmonic rejection. Explicit closed-form design formulas are made available for circuit parameter extraction. The proposed circuit features simple construction and wide spurious suppression bandwidth. For demonstration, the simulated and experimental results of a 1 GHz, 2:1 power divider implemented on micr... View full abstract»

• ### Design of Ring Couplers for Arbitrary Power Division With 50 $Omega$ Lines

Publication Year: 2011, Page(s):185 - 187
Cited by:  Papers (11)
| | PDF (209 KB) | HTML

A new 0°/180° ring coupler structure is proposed for the arbitrary power division ratios. The proposed coupler consists only of 50 Ω transmission lines with the simple ring structure. The electrical lengths of the 50 Ω branches are adjusted to obtaining any desired values of the power division ratio without changing the impedance. A very wide range of power division rat... View full abstract»

• ### Miniaturized Distributed Marchand Balun Using Coupled Synthesized CPWs

Publication Year: 2011, Page(s):188 - 190
Cited by:  Papers (12)
| | PDF (388 KB) | HTML

A miniaturized distributed Marchand balun, composed of two unequal sections of coupled slow-wave synthesized coplanar waveguides, is developed in this letter. With the even odd mode analysis, the propagation characteristics of the coupled synthesized lines are analyzed. A simple phase compensation scheme, with unequal coupling sections, is proposed to compensate for the phase imbalance due to the ... View full abstract»

• ### Improved Capacitive Loading Method for Miniaturization of 0 dB Forward-Wave Directional Couplers

Publication Year: 2011, Page(s):191 - 193
Cited by:  Papers (4)
| | PDF (277 KB) | HTML

An improved capacitive loading method for miniaturization of 0 dB forward-wave directional couplers is demonstrated. The method enables to miniaturize the coupler to have a predetermined characteristic impedance, eliminating the need for additional impedance transformers and therefore allowing for a substantial improvement in the degree of miniaturization. Experimental results for a 0 dB coupler a... View full abstract»

• ### Switchable Substrate Integrated Waveguide

Publication Year: 2011, Page(s):194 - 196
Cited by:  Papers (13)
| | PDF (621 KB) | HTML

A switchable substrate integrated waveguide is presented that can be switched between two different modes of propagation via the biasing of a pin diode switch. To demonstrate the usefulness of the design a single pole single through (SPST) waveguide switch is presented. The switch is shown to have approximately 50 dB isolation and 3 dB insertion loss over the switchable bandwidth. View full abstract»

• ### Compact and High-Isolation Quadruplexer Using Distributed Coupling Technique

Publication Year: 2011, Page(s):197 - 199
Cited by:  Papers (27)
| | PDF (440 KB) | HTML

A compact microstrip quadruplexer with high isolation is presented in this letter. The quadruplexer consists of a distributed coupling feeding line, output feeding lines and uniform resonator pairs. Since the uniform resonators would resonate at multiple fundamental frequencies, to obtain a high-isolation quadruplexer, the resonators are properly located with respect to the input and output feedin... View full abstract»

• ### Design of Microstrip Dual-Passband Filter Based on Branch-Line Resonators

Publication Year: 2011, Page(s):200 - 202
Cited by:  Papers (4)
| | PDF (376 KB) | HTML

A new type of microstrip dual-passband filter using branch-line resonators near the input and output ports is presented in this paper. The branch-line resonator plays two important roles for the proposed dual-band filter structure. One is for extracting the external quality factor of each band separately and the other is for providing the required resonance at the center frequency of each passband... View full abstract»

• ### A New Quad-Band Bandpass Filter Using Asymmetric Stepped Impedance Resonators

Publication Year: 2011, Page(s):203 - 205
Cited by:  Papers (60)
| | PDF (336 KB) | HTML

A new quad-band microstrip bandpass filter (BPF) using asymmetric stepped impedance resonators (SIRs) is proposed. The filter only employs two sets of the asymmetric SIRs. One set is designed to operate at the first and third passbands (2.4/5.2 GHz) and the other set is employed at second and fourth passbands (3.5/6.8 GHz). By tuning the impedance and length ratios of the asymmetric SIRs, a multi-... View full abstract»

• ### Ultra-Wideband (UWB) Ring Resonator Bandpass Filter With a Notched Band

Publication Year: 2011, Page(s):206 - 208
Cited by:  Papers (66)
| | PDF (511 KB) | HTML

This letter presents a novel ultra-wideband (UWB) bandpass filter (BPF) with a notched band using a ring resonator. Bandwidths of the ring resonator with two stepped-impedance stubs are calculated by examining the relations between resonant frequencies and the characteristic impedance of the ring. Stepped-impedance ports are used to obtain improved return losses in a high-frequency band. Interdigi... View full abstract»

• ### In-Line Pure ${rm E}$-Plane Waveguide Band-Stop Filter With Wide Spurious-Free Response

Publication Year: 2011, Page(s):209 - 211
Cited by:  Papers (4)
| | PDF (469 KB) | HTML

A new compact pure E-plane waveguide structure is proposed for coupling band-rejection cavities to the main rectangular waveguide in bandstop in-line filters. This coupling structure reduces drastically the unwanted resonances in filters with a very large pass band requirement. Moreover, it has some additional advantages. First, unlike typical inductive irises, large coupling coefficients can be i... View full abstract»

• ### A W-Band $times$ 12 Multiplier MMIC With Excellent Spurious Suppression

Publication Year: 2011, Page(s):212 - 214
Cited by:  Papers (11)
| | PDF (382 KB) | HTML

This letter presents a single chip × 12 frequency multiplier MMIC for the W-band that is realized in a 100 nm metamorphic HEMT technology. To obtain the × 12 multiplication factor a multiplier chain of a doubler, a tripler and a doubler has been cascaded. The circuit has a 3 dB bandwidth of 15 GHz from 85 to 100 GHz. At 94 GHz, the multiplier achieves a saturated output power of more... View full abstract»

• ### A 60 GHz Wideband Quadrature-Balanced Mixer Based on 0.13 $mu{rm m}$ RFCMOS Technology

Publication Year: 2011, Page(s):215 - 217
Cited by:  Papers (8)
| | PDF (281 KB) | HTML

A 60 GHz wideband quadrature-balanced down-conversion mixer employing a new wideband technique with an active feedback has been developed in this work. Fabricated with a 0.13 μm RFCMOS technology, the mixer exhibits a 3 dB IF bandwidth of 5 GHz with a conversion gain of 2.3 dB for a fixed LO frequency of 60 GHz. The mixer also shows an RF bandwidth of 7 GHz with a peak gain of 5.6 dB at 55 ... View full abstract»

• ### A K-Band Low-Power Colpitts VCO With Voltage-to-Current Positive-Feedback Network in 0.18 $mu{rm m}$ CMOS

Publication Year: 2011, Page(s):218 - 220
Cited by:  Papers (24)
| | PDF (1030 KB) | HTML

A circuit topology suitable for low-power Colpitts voltage-controlled oscillators (VCOs) is presented in this letter. By employing the proposed voltage-to-current positive-feedback network, the required transconductance for VCO startup can be reduced, leading to the minimized dc power for sustaining VCO oscillation. Moreover, the Q-factor enhanced varactor is used in this VCO design for phase nois... View full abstract»

• ### Linearity Improved Doherty Power Amplifier Using Coupled-Lines and a Capacitive Load

Publication Year: 2011, Page(s):221 - 223
Cited by:  Papers (5)
| | PDF (791 KB) | HTML

A Doherty power amplifier, using a pair of coupled lines loaded by a capacitor, is proposed for linearity improvement. The conventional λ/4 transmission line is substituted by capacitor-loaded coupled lines to perform impedance inversion, and to compensate phase delay. At the same time, the proposed structure is also utilized to suppress the second and higher order harmonic of the output of... View full abstract»

Publication Year: 2011, Page(s): 224
| PDF (320 KB)
• ### IEEE Microwave and Wireless Components Letters information for authors

Publication Year: 2011, Page(s): C3
| PDF (34 KB)

## 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.

Full Aims & Scope

## 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