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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 article, a compact microstrip rat-race hybrid with a 50% bandwidth employing space-filling curves is reported, and the circuit is planar, easy to design, and consists of only one layer without requiring plated holes, slots or bonding wires.
Abstract: A compact microstrip rat-race hybrid with a 50% bandwidth employing space-filling curves is reported in this letter. The footprint of the proposed design occupies 31% of the area of the conventional similar design. Across the frequency bandwidth, the maximum amplitude unbalance is 0.5 dB, the phase variation is plusmn5deg , the isolation is better than 25 dB and the return loss is greater than 10 dB. Moreover, the circuit is planar, easy to design, and consists of only one layer without requiring plated thru holes, slots or bonding wires.

80 citations

Journal ArticleDOI
TL;DR: In this paper, a symmetrical four-port microstrip coupler has been proposed for crossover application, which is based on the double-ring design and has been shown to achieve 20 dB isolation and return loss over a bandwidth of 20% (from 0.92 to 1.12 GHz).
Abstract: A symmetrical four-port microstrip coupler has been proposed for crossover application. Models have also been developed to provide insight into the performance of such a coupler, which is based on the double-ring design. Laboratory tests have confirmed that the measured isolation and return loss of the prototype coupler exceed 20 dB over a bandwidth of 20% (from 0.92 to 1.12 GHz).

79 citations

Journal ArticleDOI
TL;DR: Three types of novel bowtie antennas with round corners are presented, including quadrate, rounded-edge and triangular shapes, which have better return loss, flatter input impedance, more stable radiation patterns and smaller area at the same time.
Abstract: In this paper, three types of novel bowtie antennas with round corners are presented and studied carefully, including quadrate, rounded-edge and triangular shapes, which have better return loss, flatter input impedance, more stable radiation patterns and smaller area at the same time. The effect of round corners is attached importance to due to their novelty. The conclusion is drawn that adding the round corners at the sharp vertexes of radiation surfaces can have positive effects on performances of not only bowtie antennas but also the others.

79 citations

Journal ArticleDOI
TL;DR: In this article, the Koch iteration technique has been applied to obtain two fractal versions of a folded-slot antenna, the first iteration and the second iteration of a Koch folded slot antenna were designed, fabricated and characterized on a 30 mil thick RT/Duroid 6002 substrate.
Abstract: In this letter, the Koch iteration technique has been applied to obtain two fractal versions of a folded-slot antenna. A simple folded-slot antenna, first iteration and second iteration versions of a Koch folded-slot antenna were designed, fabricated and characterized on a 30 mil thick RT/Duroid 6002 substrate. The simple folded-slot antenna provides a return loss of 40 dB at the operating frequency of 10.45 GHz and the bandwidth for return loss greater than 10 dB is 1.211 GHz. The return loss of the first iteration of the Koch folded-slot antenna is 34 dB at 8.05 GHz and the bandwidth for 10 dB return loss is 0.4 GHz. The return loss of the second iteration of the Koch folded-slot antenna is 42 dB at 7.9 GHz and the bandwidth for 10 dB return loss is 0.34 GHz

79 citations

Journal ArticleDOI
TL;DR: A systematic design of high performance eight element antenna array for a 5G mobile terminal operating at 2.6/3.5 GHz bands and can be easily implemented for the future smartphones as it utilizes the conductive sheet or chassis and the middle vertically mounted antenna do not use the additional space of the chassis or ground.
Abstract: This work presents a systematic design of high performance eight element antenna array for a 5G mobile terminal operating at 2.6/3.5 GHz bands. The proposed eight element slot antenna array based on unit monopole slot antenna embedded in the metal casing or ground resonates at fundamental mode at 2.6 GHz. The antenna array is developed from four antennas (open-end slot antenna) etched near to the corner edges of the printed circuited board with supported pairs of vertically mounted slot antennas in middle section of the long edge ground plane. This combination of the antenna elements provided pattern diversity and enabled the smartphone in the reception of the signal in a different direction. The impedance bandwidth based on -10 dB return loss criteria cover from 2.4 GHz to 3.6 GHz includes the two allocated bands of (2400 MHz to 2600 MHz) and (3400 MHz to 3600 MHz) for 5G cellular communication systems. The vital MIMO performance measures as envelope correlation coefficient or ECC is less than 0.2 for any two antenna array meeting the required standard of less than 0.5 alongside the mean effective gain or MEG ratio of any two antenna meeting the required standard of less than 3 dB for power balance and optimal diversity performance. As modern smartphone demand desires slim handsets, the after mentioned compact multiple antenna structure can be easily implemented for the future smartphones as it utilizes the conductive sheet or chassis and the middle vertically mounted antenna do not use the additional space of the chassis or ground. The customer hand or human hand effect on the multiple antenna array to mimic the use of mobile phone customer is also studied. The maximum MIMO Channel capacity based on measured result is 34.25bps/Hz and is about 3 times of 2 × 2 MIMO operations.

78 citations


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