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# 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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• ### A New Conformal FDTD(2,4) Scheme for Modeling Three-Dimensional Curved Perfectly Conducting Objects

Publication Year: 2008, Page(s):149 - 151
Cited by:  Papers (6)
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A new high-order conformal FDTD(2,4) scheme is proposed to solve the electromagnetic scattering from 3-D curved perfectly conducting objects. For electric field components, the update equations do not need to be modified. For magnetic field components, the inner loop is treated with the locally conformal technique, and the outer loop is unmodified. Numerical results demonstrate that the high-order... View full abstract»

• ### Mode Matching Analysis of a Tapered Coaxial Tip in a Parallel-Plate Waveguide

Publication Year: 2008, Page(s):152 - 154
Cited by:  Papers (1)
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A tapered coaxial tip in a parallel plate waveguide is investigated. A boundary-value problem of electromagnetic scattering from a tapered coaxial monopole is solved rigorously based on the Fourier transform, eigenfunction expansion, and mode matching. Scattering parameters are represented in a series and computed to understand the behavior of the scattering in terms of the coaxial tip geometry. View full abstract»

• ### A Novel Technique for Measuring One-Dimensional Permittivity Profiles Using a Simple Non-Commensurate Planar Structure

Publication Year: 2008, Page(s):155 - 157
Cited by:  Papers (4)
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A novel technique is presented for measuring one-dimensional permittivity profiles based on a simple planar structure. The measuring device consists of a transmission line loaded with open-ended stubs of non-commensurate lengths. The permittivity profile of the material under test is evaluated by simply measuring the attenuation pole frequencies in the transmitted RF signal due to the different lo... View full abstract»

• ### Reconstruction of Complex Permittivity of a Longitudinally Inhomogeneous Material Loaded in a Rectangular Waveguide

Publication Year: 2008, Page(s):158 - 160
Cited by:  Papers (8)
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In this study, an integral equation technique is presented in order to reconstruct the complex permittivity variation of a material loaded in a rectangular cross section waveguide. The problem is first reduced to the solution of a two-coupled integral equations in terms of S-parameters of the system, which contains the Green's function of the empty waveguide. The resulting inverse scattering probl... View full abstract»

• ### Characterization of Multiwalled Carbon Nanotube (MWCNT) Composites in a Waveguide of Square Cross Section

Publication Year: 2008, Page(s):161 - 163
Cited by:  Papers (16)
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Multiwalled carbon nanotube (MWCNT) composites are characterized within 8-10 GHz using a waveguide of square cross section. The complex permittivity is extracted and empirical expressions are obtained as a function of frequency by minimizing the difference between the measured and theoretical values of the scattering parameters. Composites with CNT concentrations ranging from 0%-20% are investigat... View full abstract»

• ### Harmonic and Intermodulation Distortion Output of a Radio-Frequency Plasma Capacitor

Publication Year: 2008, Page(s):164 - 166
Cited by:  Papers (4)
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This letter investigates the harmonic and intermodulation distortion behavior of a prototype plasma capacitor proposed for use as a radio-frequency control device. Experiments at a fundamental frequency of 900 MHz show second and third order harmonic output as high as -29 dBc and -35 dBc respectively for a 20 dBm input. Intermodulation distortion measurements are also performed at difference frequ... View full abstract»

• ### BST-Varactor Tunable Dual-Mode Filter Using Variable ${Z}_{C}$ Transmission Line

Publication Year: 2008, Page(s):167 - 169
Cited by:  Papers (26)  |  Patents (1)
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Ferroelectric materials like barium-strontium-titanate (BST) have become attractive for microwave tunable circuit applications. This letter presents an investigation of BST-varactor tunable dual-mode filter using variable characteristic impedance or ZC transmission line. The interdigital BST varactors are fabricated and modeled, which are then deployed to realize a bandpass filter with ... View full abstract»

• ### A Simple Ultra-Wideband Suspended Stripline Bandpass Filter With Very Wide Stop-Band

Publication Year: 2008, Page(s):170 - 172
Cited by:  Papers (27)
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This letter introduces a simple ultra-wideband suspended stripline filter with a pass-band from 3.1 to 10.6 GHz and a very wide stop-band up to more than 25 GHz. The filter is realized by capacitive coupling of a quasi-lumped low-pass filter to the I/O ports. Insertion loss in the pass-band is better than 0.5 dB. The filter has a length of 13.8 mm. Excellent agreement is achieved between measured ... View full abstract»

• ### A Compact Wideband Bandpass Filter Using Transversal Resonator and Asymmetrical Interdigital Coupled Lines

Publication Year: 2008, Page(s):173 - 175
Cited by:  Papers (46)
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A compact wideband microstrip bandpass filter using transversal resonator and asymmetrical interdigital coupled lines is proposed in this letter. A wide passband is first constructed using transversal signal-interference technique, resulting a pair of transmission zeros at each side of the desired passband. By driving this transversal resonator with two asymmetrical interdigital coupled lines at t... View full abstract»

• ### Small Ultra-Wideband (UWB) Bandpass Filter With Notched Band

Publication Year: 2008, Page(s):176 - 178
Cited by:  Papers (96)
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A compact ultra-wideband (UWB) bandpass filter (BPF) with notched band has been proposed and implemented in this letter. H-shaped slot is studied and adopted to tighten the coupling of inter-digital capacitor in order to improve the BPF's performance. Three pairs of tapered defected ground structures (DGS) are formed to assign their transmission zeros towards the out of band signal, thereby suppre... View full abstract»

• ### Quadruple-Mode Coupled-Ring Resonator Bandpass Filter With Quasi-Elliptic Function Passband

Publication Year: 2008, Page(s):179 - 181
Cited by:  Papers (13)
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Quadruple-mode coupled-ring resonator is used to design quasi-elliptic function bandpass filters (BPFs) with a relatively wide bandwidth. The resonator consists of a pair of coupled rings with two open stubs symmetrically tapped to the inner ring. The stubs are used to move a transmission zero near the center frequency to lower transition band. It is believed that it is the first ring resonator BP... View full abstract»

• ### Novel Folded Waveguide Resonator Filter Using Slot Technique

Publication Year: 2008, Page(s):182 - 184
Cited by:  Papers (11)
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This letter presents a primary investigation into developing a compact and low-loss bandpass filter using novel folded-waveguide resonators with a footprint reduction. A slot coupling between adjacent resonators is introduced, which is characterized using full-wave electromagnetic simulations and verified experimentally. Two two-pole folded-waveguide resonator filters of this type have been design... View full abstract»

• ### Miniaturization of Microstrip Branch-Line Coupler With Dual Transmission Lines

Publication Year: 2008, Page(s):185 - 187
Cited by:  Papers (36)
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The dual transmission lines are proposed to replace conventional quarter-wavelength transmission lines for a compact microstrip branch-line coupler in this study. The developed coupler can be easily fabricated on the printed circuit board without lumped element; moreover, its size is greatly reduced compared to the conventional branch-line coupler. Furthermore, simulated and measured frequency res... View full abstract»

• ### A Dual-Band Out-of-Phase Power Divider

Publication Year: 2008, Page(s):188 - 190
Cited by:  Papers (37)
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This letter proposes a novel out-of-phase power divider that operates at two arbitrary frequencies. Because of the use of the balanced transmission line, namely the double-sided parallel-strip line (DSPSL), the out-of-phase feature between the two output ports can be made frequency-independent. The power divider employs three lumped components (an inductor L, a capacitor C and a resistor R) in ser... View full abstract»

Publication Year: 2008, Page(s):191 - 193
Cited by:  Papers (12)  |  Patents (3)
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A 3-dB quadrature coupler which combines the advantages of broadside-coupling and coplanar waveguide structure suitable for a single-layer printed circuit board (PCB) circuit design is proposed. Compared to the recently published broadside-coupled structures, the proposed coupler can easily be realized in a single-layer substrate by using PCB manufacturing processes to eliminate the effects of unc... View full abstract»

• ### A Novel Reduced-Size Rat-Race Broadside Coupler and Its Application for CMOS Distributed Sub-Harmonic Mixer

Publication Year: 2008, Page(s):194 - 196
Cited by:  Papers (12)  |  Patents (1)
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A broadband distributed sub-harmonic resistive field effect transistor mixer with a novel modified rat-race broadside coupler using a 0.13-mum CMOS foundry process is presented in this letter. Using the broadside coupler, a reduced-size rat-race is fabricated with a compact size of 110 times 80 mum2. From the measurement results, the mixer achieved a conversion loss of 12 dB from 32 to ... View full abstract»

• ### A 2.4 GHz Fully Integrated Cascode-Cascade CMOS Doherty Power Amplifier

Publication Year: 2008, Page(s):197 - 199
Cited by:  Papers (14)  |  Patents (1)
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This letter presents the first CMOS Doherty power amplifier (PA) fully integrated on chip. The "cascode-cascade" amplifier architecture is proposed to get rid of the bulky power splitter and facilitate the integration. The quarter wavelength transmission lines are replaced by the lumped component networks such that the whole amplifier circuit can be squeezed into the die size of 1.97 times 1.4 mm<... View full abstract»

• ### A Parallel Power Amplifier With a Novel Mode Switching Control

Publication Year: 2008, Page(s):200 - 202
Cited by:  Papers (5)
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Two parallel operating power amplifiers (PAs) are controlled by a novel mode switch for high efficiencies at both the back-off power region and high power region. The mode switch is realized by the base-collector (BC) junction diode which reuses the dc current of the low power mode amplifier. A 836 MHz CDMA PA has been demonstrated using InGaP/GaAs heterojunction bipolar transistor with fully inte... View full abstract»

• ### Distributed Amplifier With Blue Noise Active Termination

Publication Year: 2008, Page(s):203 - 205
Cited by:  Papers (4)
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Active terminations can be used to reduce the low frequency noise figure of distributed amplifiers. In this letter we show extension and improvement upon previous active termination techniques. We use a combination of active and passive elements to create a termination with a blue noise spectrum rather than a broadband white noise spectrum. The novel technique is tested in a 180 nm CMOS distribute... View full abstract»

• ### RF Class-E Power Amplifier Design Based on a Load Line-Equivalent Capacitance Method

Publication Year: 2008, Page(s):206 - 208
Cited by:  Papers (7)
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In this research work, an alternative methodology to design radio frequency (RF) class-E amplifier is proposed and verified. The conventional design procedure starts with a switch idealization of the device and extraction of the output capacitance based on S parameter measurements. Since these ideal conditions lead to non-optimal values at microwave frequencies, an optimization procedure on these ... View full abstract»

• ### A 60 GHz SiGe-HBT Power Amplifier With 20% PAE at 15 dBm Output Power

Publication Year: 2008, Page(s):209 - 211
Cited by:  Papers (16)
| | PDF (285 KB) | HTML

A monolithic power amplifier (PA) operating in the 60 GHz band is presented. The circuit has been designed utilizing an advanced 0.25 SiGe-heterojunction bipolar transistor (HBT) technology, featuring npn transistors with and . A two-stage cascode architecture has been chosen for the implementation. Design techniques and optimization procedure are explained in detail. Measurements show a small sig... View full abstract»

• ### A Sub-2 dB NF Dual-Band CMOS LNA for CDMA/WCDMA Applications

Publication Year: 2008, Page(s):212 - 214
Cited by:  Papers (26)
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This letter presents the design and experimental results of a 1.8/2.14 GHz dual-band CMOS low-noise amplifier (LNA), which is usable for code division multiple access and wideband code division multiple access applications. To achieve the narrow-band gain and impedance matching at both bands, an extra capacitor in parallel with the Cgs of the main transistor and a harmonic tuned load ar... View full abstract»

• ### A 220 GHz (G-Band) Microstrip MMIC Single-Ended Resistive Mixer

Publication Year: 2008, Page(s):215 - 217
Cited by:  Papers (17)
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This letter presents the design and characterization of a 220 GHz microstrip monolithic microwave integrated circuit single-ended resistive mixer in a 0.1 GaAs mHEMT technology. A conversion loss as low as 8.7 dB is obtained, limited by the available local oscillator (LO) power (1.5 dBm) in the measurement setup. The radio frequency (RF) bandwidth is also limited by the measurement setup, but the ... 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