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Return Loss Better (return + loss_better)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

10W CW broadband balanced limiter/LNA fabricated using MSAG MESFET process

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2003
Inder J. Bahl
Abstract This article presents the design and test data for a 10W broadband balanced limiter/LNA MMIC fabricated using MSAG MESFET process. The limiter is based on Schottky diodes and the two-stage LNA is designed using high-performance MESFETs. The typical measured performance for the limiter/LNA circuit includes gain greater than 14 dB, NF less than 2.7 dB, and return loss better than 20 dB over the 8.5,11.5 GHz frequency range. The CW power handling for the packaged limiter/LNA circuits was greater than 10W. The packaged devices were also exposed to power levels greater than 10W, and no catastrophic failures were observed up to 18W. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 118,127, 2003. [source]

Effects of parasitic resonance on a vertical transition in multilayer printed circuit boards

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2010
Sung Tae Choi
Abstract This article reports on parasitic resonance effects of a ground plane with/without a ground opening underneath a signal via with an open stub on the performance of a vertical transition in a multilayer printed circuit board. An equivalent circuit model that accounts for the parasitic resonance due to the open stub inductance and the parasitic capacitance is developed and verified with the measured and simulated results. The fabricated transition exhibits a return loss better than about 10 dB and an insertion loss less than 1.9 dB up to 21.5 GHz. A good agreement is observed between measured and simulated results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 2098,2100, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25404 [source]

Dual-mode bandpass filter using triangular patch resonator with inverted T-shaped slot

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007
Ariana L. C. Serrano
Abstract This article presents a miniaturized dual-mode narrow bandpass filter using an equilateral triangular patch resonator with an inverted T-shaped slot, which exhibited a size reduction of 37% compared with a single-mode equilateral triangular patch at the same frequency. Two- and four-pole dual-mode bandpass filters were designed and fabricated with this new resonator. Experimental results with the two-pole filter centred at 7.76 GHz showed a fractional bandwidth of 4.5%, return loss better than 17.8 dB, and minimum insertion loss of 2.2 dB. The results of the four-pole filter showed a fractional bandwidth of 3.5%, return loss better than 16 dB, minimum insertion loss of 2.6 dB, and a good second harmonic band rejection. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2897,2902, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22927 [source]

Enhanced bandwidth for a coplanar coupled-line balun design

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2007
Guan-Yu Chen
Abstract This letter presents a practical and simple uniplanar coupled-line balun with lower profile coplanar waveguide (CPW) structure to enhance the coupled coefficient and balanced output bandwidth for millimeter-wave operations. The CPW balun with a pair of symmetric quarter wavelength coupled lines is developed to increase at least 150% (1.5 times) bandwidth efficiency with a return loss better than the traditional planar coupled-line balun. The structure of the designed balun is simple, practical, and easy to fabricate. The measured results show fine agreements with the simulated data. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2902,2905, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22926 [source]

Rectangular waveguide-to-CPW transition without air-bridge in the Ka-band

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2007
A. Ramdane
Abstract The proposed waveguide-to-CPW transition is uniplanar, in line with the waveguide, and without air-bridge. Composed of a fin-line taper and a circular phase-shifter, it presents in simulation an insertion loss and a return loss better than 0.63 and 16.8 dB between 27 and 31 GHz. Measurements of the back-to-back structure are presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 510,513, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22182 [source]

LTCC broadband deep embedded interconnects (DEI) with application for embedded bandpass filter

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2003
J. J. Yu
Abstract Careful design of via transitions intended for use in practical microwave applications is needed to realize the advantages of low-temperature co-fired ceramic (LTCC), such as highly integrated buried passive circuits. Grounded coplanar waveguide (GCPW) to asymmetrical stripline vertical interconnects is optimized for thick LTCC substrate. The focus is to develop a vertical transition through thick substrate supporting deep embedded interconnects (DEI). The measured results demonstrate vertical transitions with good performance up to 20 GHz. Embedded LTCC bandpass filter with such vertical transition has been demonstrated with an insertion loss of 2.2 dB and return loss better than ,20 dB at 16.2 GHz. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 179,181, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11007 [source]

An X-band 185° CMOS phase shifter MMIC for multiple-antenna systems

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
Chien-San Lin
Abstract The design and implementation of an X-band phase shifter MMIC using the standard 0.18-,m CMOS process is presented. A transformed doublet varactor load is analyzed and applied to a 3-dB quadrature coupler to exhibit large phase shift tuning range and low insertion loss with minimal variation. By using the derived design equations, the implemented CMOS reflection-type phase shifter demonstrates a continuous phase shift tuning range greater than 185°, an average insertion loss of 5.2 dB with ±0.4 dB variation, and return losses better than 13 dB in 9,11 GHz. The total chip size including I/O pads is 0.76 × 0.79 mm2. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 645,648, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24131 [source]