Topic
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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Papers
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20 May 2001
TL;DR: In this paper, the authors describe the design and measured performance of a duplexer based on film bulk acoustic resonators (FBARs) for the 1900 MHz PCS cellular phone market.
Abstract: We will describe the design and measured performance of a duplexer based on film bulk acoustic resonators (FBARs) for the 1900 MHz PCS cellular phone market. Typical specifications for the duplexer require the Tx filter to attenuate frequencies in the Rx band by >40 dB while maintaining a worst-case insertion loss of 3.5 dB over the Tx band. VSWR must be better than 2.2 in the pass-band (8.5 dB return loss). The Rx filter must attenuate the Tx frequencies by >50 dB while maintaining a worst-case insertion loss of 4.2 dB in the Rx band. Again, VSWR must be better than 2.2.
76 citations
TL;DR: In this article, a theoretical study of microstrip crossovers is presented, where the insertion of discrete shunt capacitors is investigated and treated as linear lumped elements and connected by via-holes of rectangular cross section.
Abstract: A theoretical study of microstrip crossovers is presented. For an air-bridge interconnect in a crossover configuration, the equivalent circuit examined exhibits low-pass filter characteristics. To reduce the return loss in the passband, insertion of discrete shunt capacitors is proposed and investigated. These shunt capacitors are treated as linear lumped elements and connected by via-holes of rectangular cross section. It is emphasized that air-bridges, via-holes and lumped elements used in this particular application are all rigorously included in a full-wave spectral-domain analysis. >
76 citations
TL;DR: In this article, the design of an OAM antenna based on an original phase shifter and power divider combination at 2.5 GHz is presented, and a prototype is manufactured and characterised based on return loss, radiation and phase patterns.
Abstract: The design of an ‘orbital angular momentum (OAM) antenna’ based on an original phase shifter and power divider combination at 2.5 GHz is presented. A prototype is manufactured and characterised based on return loss, radiation and phase patterns. Both simulation and experimental results evidence the properties of waves carrying OAM. This OAM antenna is simple, compact and easy to realise, which makes it suitable for radio communications and radar applications.
76 citations
TL;DR: In this paper, a thin-film superconducting meander patch antenna coupled by an H-shaped aperture is proposed, which is analyzed using a full wave electromagnetic simulator and the theory of cavity model for microstrip patch antennas.
Abstract: A thin-film superconducting meander patch antenna coupled by an H-shaped aperture is proposed It is analyzed using a full wave electromagnetic simulator and the theory of cavity model for microstrip patch antennas The meander patch was fabricated from a single-sided film of YBCO (YBa/sub 2/CU/sub 3/O/sub 7/) on MgO with a typical transition temperature of 90 K Simulated results are presented for return loss, radiation pattern, and efficiency and these are shown in good agreement with the results obtained from network analyzer measurements An array of a number of elements is also proposed for wide-band operation
75 citations
TL;DR: In this article, the authors used the dielectric resonator antenna (DRA) as a filtering device, named as the DRA filter, to improve the insertion loss of the filter part, the DR is toploaded by a metallic disk without significantly affecting the radiation efficiency of the antenna part.
Abstract: For the first time, the dielectric resonator antenna (DRA) is simultaneously used as a filtering device, named as the DRA filter (DRAF). The theory and design methodology of the DRAF are elucidated using the cylindrical DR. It was found that the operating frequency of the filter part can be made equal to, or different from, that of the antenna part. The return loss, input impedance, radiation patterns, and insertion loss of the DRAF are studied. To improve the insertion loss of the filter part, the DR is top-loaded by a metallic disk without significantly affecting the radiation efficiency of the antenna part. The disk, in addition, can be used to tune the frequency of the filter. It was found that the antenna and filter parts of the DRAF can be designed and tuned almost independently. A second-order DRAF is also designed in this paper. As the dual function DRAF is compact and cost effective, it should find applications in modern wireless communication systems.
75 citations