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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TL;DR: A multiplicity of typical methodologies available for achieving dual-frequency operation for microstrip patch antennas are summarized and classified into three categories, based on their intrinsic mechanisms, and applied to the mobile handsets of the third-generation IMT-2000 system.
Abstract: Two major objectives are concerned in this paper. On one hand, a multiplicity of typical methodologies available for achieving dual-frequency operation for microstrip patch antennas are summarized and classified into three categories, based on their intrinsic mechanisms. On the other hand, by employing the dual-frequency solutions, microstrip patch antennas are applied to the mobile handsets of the third-generation IMT-2000 system. Two novel microstrip patch antennas with broadband property and miniaturized size have been proposed and discussed theoretically and experimentally. Only a single simply-slotted patch, either semi-disc or square, is introduced in each of the two probe-fed antennas. Both antennas exhibit the impedance bandwidths (return loss < -10dB) of 25.6% and 34.4% respectively, which would be suitable for the practical application of the IMT-2000 mobile handsets.
31 citations
TL;DR: In this article, the authors present a miniature conformal array that provides continuous coverage and good axial ratio from 1100-1600 MHz, while maintaining greater than 1.5 dBic RHCP gain and return loss less than -10 dB.
Abstract: This letter presents a miniature conformal array that provides continuous coverage and good axial ratio from 1100-1600 MHz. Concurrently, it maintains greater than 1.5 dBic RHCP gain and return loss less than -10 dB. The four element array is comprised of two-arm slot spirals with lightweight polymer substrate dielectric loading and a novel termination resistor topology. Multiple elements provide the capability to suppress interfering signals common in GNSS applications. The array, including feeding network, is 3.5" times 3.5" times 0.8" in size and fits into the FRPA-3 footprint and radome.
31 citations
23 May 2005
TL;DR: A CMOS low noise amplifier (LNA) is designed with output tunable over an ultra-wideband, with inductive source degeneration and a three-section bandpass Chebyshev filter to achieve broadband input impedance matching.
Abstract: A CMOS low noise amplifier (LNA) is designed with output tunable over an ultra-wideband. A cascode configuration is employed in the circuit, with inductive source degeneration (ISD) and a three-section bandpass Chebyshev filter to achieve broadband input impedance matching. A source follower acts as the buffer stage for broadband output impedance matching. Signal output is band-tunable over the frequency range from 6 GHz to 10 GHz. The circuit is fabricated in a standard 0.18 /spl mu/m CMOS process. Circuit performance achieves maximum power gain, S21, of 11.6 dB, the input return loss, S11, better than 9 dB, and the best noise figure of 4.2 dB. The circuit consumes power of 11.6 mW.
31 citations
TL;DR: In this article, a planar dual-L antenna with a novel tuning technique is presented for an integrated GPS/PCS dual-band application, where the tuning structure is made of a metal stub attached to one of the shorting plates of the antenna, and thus facilitates the independent tuning for lower frequency bands.
Abstract: A planar dual-L antenna with a novel tuning technique is presented for an integrated GPS/PCS dual-band application. The tuning structure is made of a metal stub attached to one of the shorting plates of the dual-L, antenna, and thus facilitates the independent tuning for lower frequency bands. Simulation and measurements were performed and dual bands of 1565.19 MHz-1585.65 MHz and 1850 MHz-1990 MHz with a return loss better than -10 dB were achieved.
31 citations
TL;DR: In this paper, the application of bridged T-coils to the design of multiplicative gain monolithic microwave IC (MMIC) amplifiers is addressed, and an actual circuit that provides gain, input, and output return losses in excess of 6, 10, and 8 dB, respectively, in the 50-MHz to 6-GHz bandwidth is described.
Abstract: Addresses the application of bridged T-coils to the design of multiplicative gain monolithic microwave IC (MMIC) amplifiers. The multiplicative gain MMIC amplifier exploits the broad-band matching properties of T-coils to achieve good input and output return loss, as well as high gain per stage. After reviewing the main theoretical aspects of this design approach, an actual circuit that provides gain, input, and output return losses in excess of 6, 10, and 8 dB, respectively, in the 50-MHz to 6-GHz bandwidth is described. >
31 citations