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Return loss

About: Return loss is a research topic. Over the lifetime, 11090 publications have been published within this topic receiving 97603 citations.


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Proceedings ArticleDOI
01 Dec 2006
TL;DR: A three-section ladder output network is exploited to achieve excellent output match in a wideband fashion and to optimize the power performance.
Abstract: In this paper, a two-stage cascaded power amplifier (PA), which consists of cascode topology, for ultrawideband (UWB) systems operating in the 3.1-4.8-GHz frequency range is presented. The shunt-shunt feedback is used to arrive at wideband matching. A three-section ladder output network is exploited to achieve excellent output match in a wideband fashion and to optimize the power performance. The PA is implemented by TSMC 0.18mm mixed signal/RF process. The measured results show the following performance: S21 of 20.7-dB, more than 10-dB input and output return loss, 5.8% maximum power-added-efficiency and 2.57dBm output P1dB with 15.57dB power gain at 3GHz.

29 citations

Journal ArticleDOI
TL;DR: The proposed defected ground structure-based microstrip patch antenna has been proposed that can work for narrowband applications and is light weighted, low cost, easy to fabricate and with better performances that makes it suitable for biomedical WLAN applications.
Abstract: Proper narrowband antenna design for wearable devices in the biomedical application is a significant field of research interest. In this work, defected ground structure-based microstrip patch antenna has been proposed that can work for narrowband applications. The proposed antenna works exactly for a single channel of ISM band. The resonant frequency of the antenna is 2.45 GHz with a return loss of around -30 dB. The -10dB impedance bandwidth of the antenna is 20 MHz (2.442-2.462 GHz), which is the bandwidth of channel 9 in ISM band. The antenna has achieved a high gain of 7.04 dBi with an increase of 17.63% antenna efficiency in terms of realized gain by using defected ground structure. Three linear vector arrays of arrangement 1 2, 1 4 and 1 8 have been designed to validate the proposed antenna performances as an array. The proposed antenna is light weighted, low cost, easy to fabricate and with better performances that makes it suitable for biomedical WLAN applications.

29 citations

Journal ArticleDOI
TL;DR: In this paper, a small size coplanar waveguide (CPW)-fed monopole antenna with wide bandwidth and small group delay variation is proposed for ultra wideband (UWB) applications.
Abstract: A novel small size coplanar waveguide (CPW)-fed monopole antenna with wide bandwidth and small group delay variation is proposed for ultra-wideband (UWB) applications. It consists of a triangular patch with a pair of wide stubs on the lower sides thereof and linearly tapered coplanar ground planes. The measured return loss of the fabricated antenna is better than −10 dB from 2.9 to 13.2 GHz. The radiation pattern is nearly omni-directional and the variation of the measured group delay between two proposed antennas is less than 0.94 ns over the entire UWB band. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1180–1182, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24278

29 citations

Journal ArticleDOI
TL;DR: In this article, a novel broadband transition from a substrate integrated waveguide to a rectangle waveguide with an antipodal fin-line in its quasi-TE mode is presented.
Abstract: A novel broadband transition from a substrate integrated waveguide to a rectangle waveguide with an antipodal fin-line in its quasi-TE mode is presented. Impedance match and field mode gradual changing of transition circuits have been carefully analysed and performed. Experimental results show about a 1.6 dB insertion loss and greater than 12 dB return loss for back-to-back transitions over 10 GHz bandwidth from 26.5 to 40 GHz, so single transition insertion loss is about 0.8 dB. The transition is proposed for low-loss front-end circuits in the millimetre-wave band.

29 citations

DOI
01 Sep 2005
TL;DR: In this article, the authors investigated the fabrication of a RF (ratio frequency) MEMS (micro elector mechanical system) switch using the standard 0.35 μm 2P4M (double polysilicon four metal) CMOS process and the post-process.
Abstract: This work investigates the fabrication of a RF (ratio frequency) MEMS (micro elector mechanical system) switch using the standard 0.35 μm 2P4M (double polysilicon four metal) CMOS (complementary metal oxide semiconductor) process and the post-process. The switch is a capacitive type, which is actuated by an electrostatic force. The structure of the switch consists of a CPW (coplanar waveguides) transmission lines and a suspended membrane. The CPW lines and the membrane are the metal layers of the CMOS process. The main advantage of the RF switch is only needed a simple post-process, which is compatible with the CMOS process. The post-process uses an etchant, silox vapox Ⅲ, to etch oxide layer to release the suspended membrane and springs. Experiment results show that the pull-in voltage of the switch is about 17 V. The insertion loss and return loss in the range of 10 to 40 GHz are -2.5 dB and -13 dB, respectively.

29 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023285
2022837
2021601
2020738
2019970
2018994