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# IEEE Microwave and Wireless Components Letters

## Filter Results

Displaying Results 1 - 25 of 27
• ### Table of contents

Publication Year: 2009, Page(s):C1 - C4
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• ### IEEE Microwave and Wireless Components Letters publication information

Publication Year: 2009, Page(s): C2
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• ### Scattering Domain Passivity Verification and Enforcement of Delayed Rational Functions

Publication Year: 2009, Page(s):605 - 607
Cited by:  Papers (12)
| | PDF (110 KB) | HTML

This letter introduces new algorithms for passivity verification and compensation of macromodels constructed from delayed rational functions in the scattering domain. For passivity verification, a frequency-dependent generalized eigenvalue is formulated, which is used to accurately determine the regions of passivity violation. For passivity compensation, first order perturbation theory is used to ... View full abstract»

• ### Parameterized S-Parameter Based Macromodeling With Guaranteed Passivity

Publication Year: 2009, Page(s):608 - 610
Cited by:  Papers (38)
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This letter presents a novel parametric macromodeling technique for scattering input-output representations parameterized by design variables such as geometrical layout or substrate features. It provides accurate multivariate macromodels that are stable and passive by construction over the entire design space. Overall stability and passivity of the parametric macromodel are guaranteed by an effici... View full abstract»

• ### A Three-Section Dual-Band Transformer for Frequency-Dependent Complex Load Impedance

Publication Year: 2009, Page(s):611 - 613
Cited by:  Papers (42)
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In this letter, we propose a practical three-section dual-band transformer, which can terminate frequency-dependent complex load impedance at two arbitrary bands simultaneously. Analytical equations are derived to achieve the exact closed-form solutions. Numerical examples are examined to verify the validity. This three-section transformer can be utilized to match the complex load impedance with u... View full abstract»

• ### Engineered Passive Nonlinearities for Broadband Passive Intermodulation Distortion Mitigation

Publication Year: 2009, Page(s):614 - 616
Cited by:  Papers (12)
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By adding controlled thicknesses of nickel and gold plating to the conductors of a coaxial transmission line, the magnitude of passive intermodulation produced by the transmission line can be controlled with precision. Theoretical predictions of distortion magnitude as a function of plating thicknesses are presented, along with an experimental validation. These adjustable-magnitude passive intermo... View full abstract»

• ### Dual-Band, Unequal Length Branch-Line Coupler With Center-Tapped Stubs

Publication Year: 2009, Page(s):617 - 619
Cited by:  Papers (19)
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A new dual-band branch-line coupler scheme is proposed based on the unequal length branch-line coupler structure and the center-tapped stub lines. The unequal length structure reduces the size of the dual-band branch-line coupler using center tapped stubs. Also, it offers the possibility of the stubless dual-band operation for some special cases, and the same phase relation can be obtained between... View full abstract»

• ### Suspended Spiral Inductor and Band-Pass Filter on Thick Anodized Aluminum Oxide

Publication Year: 2009, Page(s):620 - 622
Cited by:  Papers (11)
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We make suspended inductors and 2.45 GHz BPFs on the selectively anodized aluminum. The thick anodized alumina is used as the supporting dielectric and it is easily removed by using chemical wet-etching. The thickness of anodized alumina is 80 mum and the depth of the total air-cavity is 200 mum. The fabricated inductor over an air cavity has a 25% greater Q factor and 21% higher inductance at 2 G... View full abstract»

• ### Air-Cavity Transmission Lines on Anodized Aluminum for High-Performance RF Modules

Publication Year: 2009, Page(s):623 - 625
Cited by:  Papers (4)
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In this study, we form air-cavity transmission lines on anodized aluminum substrates. The fabricated transmission lines are microstrip, grounded CPW, and microshield structures. Thick anodized alumina is used as the post of the suspending structures, and it is realized very easily using selective chemical wet-etching. The insertion losses of the fabricated transmission lines on the anodized alumin... View full abstract»

• ### A Dual-Band Combline Bandpass Filter Loaded by Lumped Series Resonators

Publication Year: 2009, Page(s):626 - 628
Cited by:  Papers (4)
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This letter presents a dual-band combline bandpass filter (BPF) loaded by lumped series resonators. The proposed filter configuration can easily generate two desired passbands by controlling the resonant frequencies of the comblines as well as the series resonators. Furthermore, the skirt frequency characteristics between the two passbands are improved by transmission zeros introduced by source-lo... View full abstract»

• ### A Novel Low-Pass Filter With an Embedded Band-Stop Structure for Improved Stop-Band Characteristics

Publication Year: 2009, Page(s):629 - 631
Cited by:  Papers (21)
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This letter presents a novel design of a microstrip low- pass filter (LPF) with an embedded band-stop structure, which is constructed from a simple two transmission line band-stop filter. The band-stop structure is ingeniously embedded into a classical step-impedance microstrip LPF. The stop-band of the proposed LPF is more than two times broader than the original design, while its cut-off frequen... View full abstract»

• ### A Differential-Mode Wideband Bandpass Filter on Microstrip Line for UWB Application

Publication Year: 2009, Page(s):632 - 634
Cited by:  Papers (94)
| | PDF (197 KB) | HTML

A differential-mode wideband bandpass filter (BPF) on microstrip line is proposed with good common-mode suppression. A four port two stage branch-line differential-mode BPF is first designed. Then, open circuited stubs are attached to the middle of two of the vertical branches. As such, its two-port bisection becomes a bandpass or bandstop filtering topology under differental- or common-mode excit... View full abstract»

• ### A Superconducting Microstrip Ultra-Wideband (UWB) Bandpass Filter at VHF-Band

Publication Year: 2009, Page(s):635 - 637
Cited by:  Papers (4)
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A compact superconducting ultra-wideband filter with a passband from 125 to 260 MHz is demonstrated. The filter consists of ten shunt short-circuited stubs separated by connecting lines. The short-circuited stubs are grounded via a grounding strip that is attached to the box wall by a number of SiAl bonding wires. The filter is realized on two 2 in YBCO/LaAlO3 substrates, which are conn... View full abstract»

• ### Passive Millimeter-Wave Microscopy

Publication Year: 2009, Page(s):638 - 640
Cited by:  Papers (4)
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A new type of millimeter-wave imaging technique, passive millimeter-wave microscopy is proposed and demonstrated. Passive millimeter-wave imaging techniques when combined with scanning near-field microscopy enable direct observation of millimeter-wave signals thermally emitted from the viewed object with a spatial resolution below the diffraction limit. Details of our passive microscope system ope... View full abstract»

• ### Waveguide Probes Using Single Negative Media

Publication Year: 2009, Page(s):641 - 643
Cited by:  Papers (5)
| | PDF (342 KB) | HTML

In this work, we show that by using single negative (SNG) media, the sensitivity of open-ended near-field waveguide probes can be enhanced. The enhancement is due to the evanescent wave amplification property of SNG media. As a demonstration of the efficacy of the proposed SNG-enhanced probe, we present a numerical study of the case of detecting precursor pitting in aluminum plates. We show that t... View full abstract»

• ### A 60 GHz Six-Port Distance Measurement System With Sub-Millimeter Accuracy

Publication Year: 2009, Page(s):644 - 646
Cited by:  Papers (10)
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A new compact six-port millimeter-wave distance measurement system is presented. The radar operates at the single frequency of 60 GHz and makes use of both the magnitude and phase of the measured free-space reflection coefficient to overcome the ambiguity of phase. The principle of operation, the system and experimental results are described in this letter. View full abstract»

• ### Broadband InGaAs PIN Traveling-Wave Switch Using a BCB-Based Thin-Film Microstrip Line Structure

Publication Year: 2009, Page(s):647 - 649
Cited by:  Papers (4)
| | PDF (217 KB) | HTML

This letter describes the design and fabrication of a broadband InGaAs PIN traveling wave switch. A new thin-film microstrip line structure integrated with InGaAs PIN diodes has been used to enhance the switch performance at higher frequencies. The developed InGaAs PIN switch has an insertion loss of less than 3.2 dB and an isolation of greater than 40 dB in a broadband frequency range from 25 to ... View full abstract»

• ### A Low-Noise WLAN Mixer Using Switched Biasing Technique

Publication Year: 2009, Page(s):650 - 652
Cited by:  Papers (12)
| | PDF (272 KB) | HTML

A low-noise CMOS down-conversion mixer for WLAN applications is presented in this letter. The proposed mixer is based on the conventional Gilbert-type topology with switched biasing technique for a current source instead of static biasing, which lowers noise over a wide range of frequencies. Moreover, a dc level shifter is used for the symmetric switching operation in tail current transistors. A c... View full abstract»

• ### A Wide Tuning Range Voltage Controlled Oscillator Using Common-Base Configuration and Inductive Feedback

Publication Year: 2009, Page(s):653 - 655
Cited by:  Papers (5)
| | PDF (363 KB) | HTML

Usually the tuning range of voltage controlled oscillator (VCO) is much narrower than the possible resonant frequency range of the tank at different tuning voltages. In this letter we analyze the traditional common-base type VCO, give a simple but useful insight about the mechanism behind the topology, and verified the conclusions with a 2 mum heterojunction bipolar transistor (HBT) VCO. The resul... View full abstract»

• ### An E-TSPC Divide-by-2 Circuit With Forward Body Biasing in 0.25 $mu$ m CMOS

Publication Year: 2009, Page(s):656 - 658
Cited by:  Papers (5)  |  Patents (1)
| | PDF (589 KB) | HTML

A forward body biasing (FBB) technique is employed by an extended true-single-phase-clock (E-TSPC) divide-by-2 circuit in 0.25 mu m CMOS for an efficient on-chip control of power and speed. By applying the forward body bias voltage of 0.4 V, the maximum operating frequency is improved by 78% while the current dissipation is increased only by 21%. As a result, the divider figure-of-merit is improve... View full abstract»

• ### A 10 GHz Phase-Locked Loop With a Compact Low-Pass Filter in 0.18 $mu$ m CMOS

Publication Year: 2009, Page(s):659 - 661
Cited by:  Papers (4)
| | PDF (541 KB) | HTML

In this letter, a multi-gigahertz phase-locked loop (PLL) with a compact low-pass filter is presented. By using a novel dual-path control in the PLL architecture, the capacitance in the loop filter can be effectively reduced for high-level integration while maintaining the required loop bandwidth. Consequently, the noise resulted from off-chip components is therefore eliminated, leading to lower t... View full abstract»

• ### A 0.6 V Low-Power Wide-Range Delay-Locked Loop in 0.18 $mu$m CMOS

Publication Year: 2009, Page(s):662 - 664
Cited by:  Papers (13)
| | PDF (409 KB) | HTML

In this letter, a delay-locked loop (DLL) suitable for low-power and low-voltage operations is presented. To overcome the performance limitations, such as a restricted locking range and elevated output jitters, a novel voltage-controlled delay cell and a phase/frequency detector with a start controller are employed in the proposed DLL. Using a standard 0.18 mum CMOS process, the fabricated circuit... View full abstract»

• ### On the Continuity of High Efficiency Modes in Linear RF Power Amplifiers

Publication Year: 2009, Page(s):665 - 667
Cited by:  Papers (101)  |  Patents (2)
| | PDF (338 KB) | HTML

A novel formulation for the voltage waveforms in high efficiency linear power amplifiers is described. This formulation demonstrates that a constant optimum efficiency and output power can be obtained over a continuum of solutions by utilizing appropriate harmonic reactive impedance terminations. A specific example is confirmed experimentally. This new formulation has some important implications f... View full abstract»

• ### A New Wideband Distributed Doherty Amplifier for WCDMA Repeater Applications

Publication Year: 2009, Page(s):668 - 670
Cited by:  Papers (17)  |  Patents (2)
| | PDF (560 KB) | HTML

A new wideband distributed Doherty amplifier (WDDA) for wideband code division multiple access (WCDMA) repeater applications is reported. The distributed structure provides wideband performance while not needing an N-way splitter and combiner. The two-stage Doherty amplifiers achieve high gain and high efficiency. Also, the linearity of the WDDA is improved by the post-distortion using gate... View full abstract»

• ### A Novel Linearization Method of CMOS Drive Amplifier Using IMD Canceller

Publication Year: 2009, Page(s):671 - 673
Cited by:  Papers (8)
| | PDF (228 KB) | HTML

A novel linearization method for CMOS drive amplifier using intermodulation distortion (IMD) canceller is presented. The IMD cancellation method is composed of a cascode main amplifier and a common-source IMD canceller. The additional common-source amplifier generates IMD3 signals with 180deg phase difference against the IMD3 of the cascode main amplifier. The linear drive amplifier is designed an... 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.

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