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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
18 Nov 2008
TL;DR: To the knowledge of the authors, this is the first 60 GHz digitally controlled phase shifter with a phase resolution of 22.5deg in silicon reported to date.
Abstract: This paper presents a 60 GHz digitally controlled phase shifter in the 65 nm CMOS technology. Using a differential varactor-loaded transmission-line architecture, the phase shifter achieves a phase resolution of 22.5deg, an average insertion loss of 8.5 to 10.3 dB and a return loss of better than 10 dB from 55 to 65 GHz. The phase shifter occupies an area of only 0.2 mm2. To the knowledge of the authors, this is the first 60 GHz digitally controlled phase shifter with a phase resolution of 22.5deg in silicon reported to date. It is well suited for a 60 GHz phased array.

65 citations

Journal ArticleDOI
TL;DR: A novel quasi-Yagi antenna is proposed for millimeter-wave (mmWave) 5G cellular handsets operating in the 28 GHz band and designed to be compact through modification of the planar folded dipole topology so that it can be mounted inside a compact mobile terminal.
Abstract: A novel quasi-Yagi antenna is proposed for millimeter-wave (mmWave) 5G cellular handsets operating in the 28 GHz band. The proposed antenna is designed to be compact through modification of the planar folded dipole topology so that it can be mounted inside a compact mobile terminal. A vertically stacked structure utilizing a multilayer printed circuit board (PCB) and via holes is applied to the antenna topology to minimize the antenna lateral width while maintaining the characteristics of the planar folded dipole antenna. A single antenna yields a $-$ 10 dB bandwidth for a return loss of 12.3% (26.3 to 29.75 GHz) and a gain of 5.51 dBi at 28 GHz. The change in beam patterns due to the chassis effect when four-element linear arrays are inserted into the upper and side edge inside the terminal is analyzed.

65 citations

Journal ArticleDOI
TL;DR: In this article, a simple micromachining solution is used to cancel the parasitic modes triggered by the transition in the grounded coplanar waveguide feed line, which results in an insertion loss of 0.3 dB and a return loss better than -18 dB from 75 to 110 GHz.
Abstract: Mode conversion at the transition between grounded coplanar waveguide (GCPW) and microstrip line is demonstrated. Experimental results show the effect of overmoding in a conductor-backed coplanar waveguide on the transition behavior. A simple micromachining solution is used to cancel the parasitic modes triggered by the transition in the GCPW feed line. This results in an insertion loss of 0.3 dB and a return loss better than -18 dB from 75 to 110 GHz. The transition can prove very useful for millimeter-wave packaging and interconnects.

65 citations

Journal ArticleDOI
TL;DR: In this article, a new class of wideband phase shifters on multimode resonator is proposed and developed, which have a simple structure, intrinsic wideband characteristic, large phase shift value, and easy adjustment in phase shift.
Abstract: In this paper, a new class of wideband phase shifters on multimode resonator is proposed and developed. Compared with its conventional counterparts, these new phase shifters have a few advantageous features such as simple structure, intrinsic wideband characteristic, large phase-shift value, and easy adjustment in phase shift. The phase properties of multimode resonator are at first studied to derive the quantitative relationship between the phase slope and their respective resonant frequencies. On the one hand, a prescribed wideband phase shift can be achieved by adjusting the impedance ratio $R_{z}$ of the multimode resonator and the electrical length of the reference line. On the other hand, the wide operating band can be intrinsically obtained over a frequency range covered by multiple resonant frequencies in the multimode resonator. In this context, the transmission-line models of the proposed phase shifters are deduced and synthesized to design these phase shifters with a prescribed phase shift value and return loss within the operating band. Moreover, the synthesized model can be directly mapped into all the physical dimensions, thus allowing for a quick design process. Finally, two 180° wideband phase shifters are designed, fabricated, and tested to verify the proposed design method and predicted frequency responses.

65 citations

Journal ArticleDOI
TL;DR: In this paper, a new Y-junction four-way power divider is proposed by integrating the 90° Y-Junction SIW power dividers and the half-mode substrate integrated waveguide (HMSIW), which can be used in millimetre-wave and microwave circuits owing to its simple and novel structure.
Abstract: The substrate integrated waveguide (SIW) plays a very important role in millimetre-wave and microwave integrated circuits and systems with low return loss and high Q-factor. Also, the half-mode substrate integrated waveguide (HMSIW) has been developed in recent years. A new Y-junction four-way power divider is proposed by integrating the 90° Y-junction SIW power divider and HMSIW power divider. Simulated and measured results show that the return loss of the input port is below -15 dB over 8.6 to 12.2 GHz and transmissions are about -7.6 dB ± 0.2 dB in the passband. So, it makes the 6 dB power divider used preferably in a broad bandwidth. The new power divider can be produced in batches and can be widely used in millimetre-wave and microwave circuits owing to its simple and novel structure.

64 citations


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