IEEE Microwave and Wireless Components Letters

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

Publication Year: 2011, Page(s): C2
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• General ADI-FDTD Formulations for Multi-Term Dispersive Electromagnetic Applications

Publication Year: 2011, Page(s):513 - 515
Cited by:  Papers (6)
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General formulations of the alternating direction implicit finite difference time domain method are presented for modeling multi-term dispersive electromagnetic applications. The proposed formulations, which are based on the exponential evolution operator scheme, allow modeling different types of frequency dependent materials in the same manner and can be easily incorporated with the nearly perfec... View full abstract»

• Synthesis of Filters With Stub-Loaded Multiple-Mode Resonators

Publication Year: 2011, Page(s):516 - 518
Cited by:  Papers (6)
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Exact synthesis of compact and wide-band filters with stub-loaded multiple-mode resonators is investigated in this letter. The multi-mode behavior and characteristics of the proposed filter structure are studied by conventional natural modes analysis. To develop the complete synthesis procedure, a bandpass prototype in the S-plane is used for good spurious suppression and size reduction. Ap... View full abstract»

• Orthogonal Coaxial Cavity Filters With Distributed Cross-Coupling

Publication Year: 2011, Page(s):519 - 521
Cited by:  Papers (6)
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In this letter, six-pole filters are presented, in which the coaxial cavity resonators are arranged with 90 degree rotated spatial orientation. Cross-coupling between nonadjacent resonators will appear. In the new proposed filter topologies the cross-coupling elements are not arranged in separated triplet or quadruplet blocks. They interlace to form distributed cross-coupling. Synthesis of the dis... View full abstract»

Publication Year: 2011, Page(s):522 - 524
Cited by:  Papers (38)
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In this letter, a class of triple-/quad-mode stub-loaded resonators is proposed and analyzed for application in bandpass filters (BPFs). First, a pair of two identical open-ended stubs, shorter than λ/2, are tap-connected to a λ/2 resonator at two symmetrical positions with respect to its center. It results to excite three resonant modes closely to each other while producing a transm... View full abstract»

• Dual-Mode Dual-Band Bandpass Filter Based on a Stub-Loaded Patch Resonator

Publication Year: 2011, Page(s):525 - 527
Cited by:  Papers (43)
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This letter presents a dual-mode dual-band bandpass filter using a patch resonator with a cross slot and two different groups of stubs loaded. The cross slot with different orthogonal lengths excites orthogonal modes in the passbands and reduces the patch size. Meanwhile, the two sets of stubs can modify the filter's input impedance at different frequencies and control the even and odd modes in th... View full abstract»

• Hybrid Microstrip/DGS Cell for Filter Design

Publication Year: 2011, Page(s):528 - 530
Cited by:  Papers (4)
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In this letter, a compact bandpass filter is proposed based on the hybrid microstrip/defected ground structure (DGS) cells with an interdigital-coupled (IC) scheme. The hybrid cell can employ two functions for the filter: 1) dual-resonances operation and 2) two close transmission zeros around the resonances. With a proper coupled scheme (i.e., the IC scheme), the narrow-band coupling for the passb... View full abstract»

• A Compact V-Band Bandpass Filter in IPD Technology

Publication Year: 2011, Page(s):531 - 533
Cited by:  Papers (20)
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This work presents a miniaturized bandpass filter in V-band using integrated passive device (IPD) technology with thick metal layers and Benzocyclobutene (BCB) dielectric on a glass substrate. The proposed filter, comprised of two stepped-impedance resonators with quarter-wave short-circuited stubs and floating pads, has low passband insertion loss and high stopband attenuation in a compact size. ... View full abstract»

• Design of Compact Quadruplexer Based on the Tri-Mode Net-Type Resonators

Publication Year: 2011, Page(s):534 - 536
Cited by:  Papers (31)
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A compact size and high isolation microstrip quadruplexer based on the tri-mode net-type resonators is proposed in this letter. The quadruplexer is composed of four folded tri-mode net-type resonator filters with one input and four output coupled-line structures. By adjusting the structural parameters of a single tri-mode net-type resonator, its first three resonant frequencies can be controlled a... View full abstract»

• A Miniaturized 3 dB Branch-Line Hybrid Coupler With Harmonics Suppression

Publication Year: 2011, Page(s):537 - 539
Cited by:  Papers (42)
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This letter presents a miniaturized 3 dB branch-line hybrid coupler with second harmonic suppression using high-impedance transmission lines and interdigitated shunt capacitors. By using the interdigitated capacitors shunt with the transmission lines, further minimization of the 3 dB branch-line hybrid coupler can be achieved compared with previously reported techniques. The design of the interdig... View full abstract»

• Retained Sub-Diffraction-Limit Resolution in 2-D Random Transmission Line Left-Handed Lenses

Publication Year: 2011, Page(s):540 - 542
Cited by:  Papers (3)
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The propagation of electromagnetic wave has been investigated experimentally in 2-D left-handed (LH) transmission line networks that are composed of circuit elements in disordered alignment. The backward wave and the growing evanescent field are observed in the slab-like so-called superlens configuration of the disordered transmission line network. It is found that even though the disorder level o... View full abstract»

• Comments on “Compact Wideband Bandstop Filter With Four Transmission Zeros”

Publication Year: 2011, Page(s): 543
Cited by:  Papers (1)
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In this paper the four zeros roll-off and stopband bandwidth performance of the compact wideband bandstop filter consisting of an open-ended coupled-line connected in parallel to a transmission line is obtained with three zeros BSF. View full abstract»

• Millimeter-Wave SiGe HBT High Voltage/High Power Architecture Implementation

Publication Year: 2011, Page(s):544 - 546
Cited by:  Papers (4)  |  Patents (1)
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This letter discusses the first implementation of the high voltage/high power (HiVP) architecture in silicon at millimeter-wave frequencies. Implemented in a commercial 0.12 μm SiGe HBT BiCMOS process, PSAT = 19.0 dBm with a PAE of 11.47% in an area of 0.21 mm2, have been measured at center frequency 30 GHz. This architecture provides a new tool for silicon designers t... View full abstract»

• A 100–117 GHz W-Band CMOS Power Amplifier With On-Chip Adaptive Biasing

Publication Year: 2011, Page(s):547 - 549
Cited by:  Papers (14)
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A W-band power amplifier (PA) has been realized in 65 nm bulk CMOS technology, which covers 100 to 117 GHz. It delivers up to 13.8 dBm saturated output power with up to 15 dB power gain and 10% PAE, which also achieves better than 10.1 dBm output P1 dB. The PA features compact realization with transformer-coupled three stages and on-chip input/output baluns to facilitate single-ended characterizat... View full abstract»

• A Three Stage, Fully Differential 128–157 GHz CMOS Amplifier with Wide Band Matching

Publication Year: 2011, Page(s):550 - 552
Cited by:  Papers (13)
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A fully differential amplifier has been realized in 65 nm CMOS technology, which has demonstrated 20 dB peak gain, over 10 dB gain from 128-157 GHz, and 40 GHz positive gain range from 126 to 166 GHz. By using cascode architecture with high bulk voltage tied to the cascode devices in deep-Nwell, the amplifier ensures stability and can use 2 V supply reliably. By inserting a π-matching netwo... View full abstract»

• Low Noise 24 GHz CMOS Receiver for FMCW Based Wireless Local Positioning

Publication Year: 2011, Page(s):553 - 555
Cited by:  Papers (14)
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This work demonstrates a fully integrated 24 GHz CMOS receiver targeted for low power and compact wireless sensor nodes utilizing FMCW radar for wireless local positioning. The receiver incorporates a highly integrated low noise amplifier, passive mixer and on-chip transformer balun for single-to-differential conversion of LO. The receiver chip has been realized in a 130 nm CMOS technology. At 24 ... View full abstract»

Publication Year: 2011, Page(s):556 - 558
Cited by:  Papers (2)
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A one-port load-pull measurement has been carried out in order to investigate the effect of loading on the RF power performance of a planar Gunn diode operating in the transit-time mode at 102 GHz. A W-band manual E-H tuner was applied between a waveguide mixer and a wafer probe to vary the load impedance on the Gunn diode. It has been found that more than 25 dB variation of output power was obtai... View full abstract»

• Design of Ring-Oscillator-Based Injection-Locked Frequency Dividers With Single-Phase Inputs

Publication Year: 2011, Page(s):559 - 561
Cited by:  Papers (10)
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Ring-oscillator-based injection-locked frequency divider has merits of compact and low power. The multi-phase injection can improve its locking range, but it needs specific multi-phase inputs, which limits the application of this technique. We present a symmetrical injection circuit to generate the multi-phase injection with only single-phase input. Two injection-locked frequency dividers, with di... View full abstract»

• A 60 GHz Sub-Harmonic Resistive FET Mixer Using 0.13 $mu{rm m}$ CMOS Technology

Publication Year: 2011, Page(s):562 - 564
Cited by:  Papers (8)
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A 56 to 66 GHz sub-harmonic resistive mixer using 0.13 μm CMOS technology is presented in this letter. This mixer exhibits a flat conversion loss of about -12 and -13 dB and good isolations between ports from 56 to 66 GHz for both down and up-conversion with a lowest LO power of 0 and -1 dBm. The 2LO-RF isolation is more than 27 dB even if IF input power exceeds 4 dBm, which results from th... View full abstract»

• A 12 GHz-Bandwidth CMOS Mixer With Variable Conversion Gain Capability

Publication Year: 2011, Page(s):565 - 567
Cited by:  Papers (7)
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A broadband downconverter mixer using an operational transconductance amplifier (OTA) in the RF transconductor stage is presented in this paper. By changing the OTA's transconductance through a dc control voltage, the mixer's conversion gain is varied. Experimental results show that the mixer's conversion gain can vary from 17 dB down to 1.2 dB over a 12 GHz bandwidth. The maximum IP1 dB View full abstract»

• A High Gain Low Noise Mixer With Cross-Coupled Bleeding

Publication Year: 2011, Page(s):568 - 570
Cited by:  Papers (3)
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A mixer implementing a cross-coupled bleeding circuit for improved conversion gain and noise performance is reported. The proposed mixer is implemented in 0.18 μm CMOS technology. The measured results show a 17 dB conversion gain, - 4.7 dBm IIP3 for an RF signal frequency of 765 MHz, 7.9 dB noise figure, and 125 kHz flicker noise corner while consuming 3.12 mA from a 1.8 V supply. View full abstract»

• A Power-Recycling Technique for Improving Power Amplifier Efficiency Under Load Mismatch

Publication Year: 2011, Page(s):571 - 573
Cited by:  Papers (10)  |  Patents (3)
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This letter presents a method for improving the efficiency of a power amplifier (PA) under load mismatch by recycling the reflected power. By configuring the PA as a balanced PA, the reflected power will be directed to the isolation port of a 90° hybrid coupler. The reflected power can then by rectified and converted back to dc power to assist in supplying the PA. A prototype sys... View full abstract»

• Correction to “A High-Efficiency, High-Power Millimeter-Wave Oscillator Using a Feedback Class-E Power Amplifier in 45 nm CMOS” [Aug 11 430-432]

Publication Year: 2011, Page(s): 574
Cited by:  Papers (1)
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In the above letter (ibid., vol. 21, no. 8, pp. 430-432, Aug. 2011), incorrect versions of Fig. 4 and Fig. 5 were published. The correct versions of both figures are presented here. View full abstract»

Publication Year: 2011, Page(s): 575
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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