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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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Journal ArticleDOI
TL;DR: In this paper, a frequency reconfigurable U-slot microstrip antenna with T-shaped feed line for software defined radio applications is proposed, which operates at three different frequencies: 1.85GHz, 1.9GHz and 2.4GHz depending on the switching states of PIN diodes.
Abstract: In this paper, a novel frequency reconfigurable U-slot microstrip antenna with T-shaped feed line for Software Defined Radio applications is proposed. The proposed antenna, indexed as A-I in this paper, operates at three different frequencies: 1.85GHz, 1.9GHz and 2.4GHz depending on the switching states of PIN diodes. Furthermore, to strengthen the proposed design concept and strategy another improved antenna (A-II) is designed and tested. In comparison to antenna A-I, the improved antenna design (A-II) utilizes four slots/PIN diodes in order to increase the number of reconfigurable frequency states. Depending on the switch states of four PIN diodes, antenna A-II operates on five different reconfigurable frequency bands centered at: 1.5GHz, 1.6GHz, 1.8GHz, 1.9GHz and 2.24GHz. The measured results show a return loss better than 22 dB, maximum gain of 2.5 dB and maximum efficiency of 78%. Moreover, radiation pattern for the proposed antennas is stable at all operating frequencies.

37 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe a new low-pass filter topology based on tapered periodic structures, which exhibits interesting characteristics in terms of compactness, return loss, insertion loss, selectivity and the suppression of spurious frequency bands.
Abstract: This paper describes a new low-pass filter topology based on tapered periodic structures. These filters exhibit interesting characteristics in terms of compactness, return loss, insertion loss, selectivity, and the suppression of spurious frequency bands. Hybrid prototypes with a 1-GHz cutoff frequency, based on a coplanar-waveguide technology, and using both low-cost and high-performance substrates, have been fabricated and measured. Spurious frequency bands can be suppressed to below -22 dB at frequencies up to 20 GHz. Passband ripples are negligible, and the return loss is better than 20 dB. A two-section filter has a length of 0.2 lambda and exhibits a -120-dB/dec selectivity, while a six-section filter is 0.51 lambda long and has a -560-dB/dec selectivity. A design procedure has been established. These filters are compatible with monolithic microwave integrated circuit technologies in which the capacitors can be realized as metal-insulator-metal structures

37 citations

Journal ArticleDOI
TL;DR: In this paper, a modified circular microstrip feedline leads to good impedance matching in a wide dual-band antenna, and the peak antenna gain is 4.61 dBi and 3.80 dBi for the lower (cellular and GSM) and upper (DCS, PCS, and IMT-2000) bands, respectively.
Abstract: In this paper, we study a circular microstripline-fed single-layer single-slot antenna. In this case, a modified circular microstrip feedline leads to good impedance matching in a wide dual band. The 10-dB return loss impedance bandwidth is 50.8% for cellular (0.824–0.96 GHz) and GSM (0.86–0.88 GHz) operations, and is 37.1% for DCS (1.71–1.88 GHz), PCS (1.85–1.99 GHz), and IMT-2000 (1.90–2.20 GHz) operations. We obtain the result for the return loss of exhibited multi-band characteristics. The peak antenna gain is 4.61 dBi and 3.80 dBi for the lower (cellular and GSM) and upper (DCS, PCS, and IMT-2000) bands, respectively. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 59–62, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10824

36 citations

Journal ArticleDOI
TL;DR: By properly designing the common mode APN phase shifter, an equal ripple phase shift response over a very large bandwidth can be realized.
Abstract: The design of digital phase shifters with bandwidths from 2:1 up to 20:1 using common mode all-pass networks (APNs) is presented. Because of the inherently large return loss value of the APNs, the phase shift response is not affected by the return loss and therefore the phase shift can be treated separately. The common mode APNs enable the use of standard switches and low cost fabrication. By properly designing the common mode APN phase shifter, an equal ripple phase shift response over a very large bandwidth can be realized. As an example, a 3 b 360° phase shifter covering a bandwidth of one decade (10:1) is designed using discrete components on PCB. An RMS phase error less than 10°, a return loss larger than 10 dB, and an amplitude imbalance less than 1.5 dB are measured from 100 MHz to 940 MHz.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a new type of absorptive bandstop filter (ABSF) design was proposed for absorbing the localoscillator-to-RF leakage of mixer in a heterodyne receiver.
Abstract: This paper presents a new type of absorptive bandstop filter (ABSF) design that is targeted for absorbing the local-oscillator-to-RF leakage of mixer in a heterodyne receiver The proposed ABSF is designed to absorb the input power at its Port 1, and it is achieved by introducing one lossy resonator to a conventional narrowband coupled-line bandstop filter Suitable equivalent circuit models and closed-form design equations are established to enable the direct synthesis of proposed ABSFs Specifically, a proposed microstrip ABSF with a stopband center frequency $f_{0}$ of 2 GHz is demonstrated The maximal stopband rejection is 348 dB with an input return loss of 277 dB, which implies that 998% of the input power is dissipated by the proposed ABSF

36 citations


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