Topic
Return loss
About: Return loss is a research topic. Over the lifetime, 11090 publications have been published within this topic receiving 97603 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, an asymmetrical feed-network composed of microstrip T-junctions with 2:1 power ratio, quarter-wavelength impedance transformers, and 180° phase shifters is proposed for the application of WiMAX base station.
Abstract: Two novel array antennas (3×2 and 3×3) with broadband and high gain characteristics are proposed for the application of WiMAX base station. To maintain the same electric current intensity with identical phase for each array element, an asymmetrical feed-network which composed of microstrip T-junctions with 2:1 power ratio, quarter-wavelength impedance transformers, and 180° phase shifters are devised, which in turn exhibits a desirable gain of more than 17 dBi at boreside direction for the proposed array antennas. Furthermore, by embedding a U-slot into all array elements, enhanced operating bandwidth measured along 14-dB return loss can be achieved, so that the WiMAX band operating between 3.3 and 3.8 GHz can be covered.
39 citations
TL;DR: By exploring embedding transversal signal-interference sections in a Wilkinson power divider, this letter proposes a novel methodology for the filter and power Divider co-design that realizes simultaneous power division and filtering in a single uniplanar circuit.
Abstract: By exploring embedding transversal signal-interference sections in a Wilkinson power divider, this letter proposes a novel methodology for the filter and power divider co-design. The structure realizes simultaneous power division and filtering in a single uniplanar circuit. In this letter, the equations as well as the detailed design methodology are given. In the last section, simulations and experiments are carried out, the results of which show a filtering power-division performance with 90% bandwidth (15-dB return loss) and two transmission zeros at the passband edges.
39 citations
TL;DR: In this paper, the authors proposed a method to control the aperture phase distribution of antenna using a metasurface to point the antenna beam to desired directions, and the measured results show that the beam directions are within 29.3 ± 1° from 34.25 to 35.75 GHz with a return loss better than 15 dB.
Abstract: The method to control the aperture phase distribution of antenna using a metasurface is proposed to point the antenna beam to desired directions. A $1\times 10$ substrate-integrated waveguide (SIW) slot array antenna directly integrated with the metasurface of double-layer miniaturized framed Jerusalem crosses is, for example, designed to achieve the oblique radiation beam in 30° at $Ka$ -bands. In order to achieve a full 360° transmission phase range, part of SIW slots are inverted to obtain additional 180° phase shift so that more than 400° phase shift range is realized. The measured results show that the beam directions are within 29.3 ± 1° from 34.25 to 35.75 GHz with a return loss better than 15 dB. The measured maximum gain is 12.1 dBi at 34.75 GHz. The combination of the array antenna and the metasurface features a low profile, simple structure, and flexible design for oblique beam application.
39 citations
TL;DR: In this paper, a dual-polarized broadband 2-18 GHz horn antenna with VSWR≤ 2.2 is presented, where a coaxial line to quadruple-ridged waveguide transition with a new conical cavity back and a technique for tapering the flared section of the horn is introduced to improve the return loss and matching of the impedance.
Abstract: A novel design of a dual-polarized broadband 2–18 GHz horn antenna with VSWR≤ 2.2 is presented. The designed horn antenna is most suitable as a feed element in reflectors of the radar systems and EMC applications. A coaxial line to quadruple-ridged waveguide transition with a new conical cavity back and a technique for tapering the flared section of the horn is introduced to improve the return loss and matching of the impedance, respectively. In order to overcome the deterioration of the broadside radiation pattern at higher frequencies, common to broad band ridged horn antennas, a new modified horn antenna with arc shaped aperture is introduced. Results of simulation obtained via two different software packages, HFSS and CST, for VSWR, isolation, radiation patterns, and gain of the designed quad ridged horn antenna as well as the modified horn antenna are presented and discussed.
39 citations
01 Nov 2019
TL;DR: A novel compact antenna for the millimetre-wave (MMW) frequency range, having some ultra-wideband capability and potentially acceptable figure at the important 60 GHz oxygen-absorption band, which may be deployed later under 5G or the forthcoming sixth generation.
Abstract: This paper introduces a novel compact antenna for the millimetre-wave (MMW) frequency range, having some ultra-wideband capability. The proposed antenna has been designed to target the 5th generation operating bands ranging from 24GHz to 70GHz and can be considered as a potential candidate for 5G wireless networks. The designed antenna uses a microstrip patch structure, fed by coplanar waveguide (CPW); it shows excellent return loss performance in the 36 GHz band that is expected to be deployed for 5G mobile in the relatively near future, but it also has adequate return loss from 30 to 50 GHz and a potentially acceptable figure at the important 60 GHz oxygen-absorption band, which may be deployed later under 5G or the forthcoming sixth generation. The design is etched on high performance planar substrate, using a coplanar waveguide structure on the upper surface, but with a defected ground plane underneath.
39 citations