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 modified three-stage UWB LNA with inter-stage inductors with forward Body-Biased technique used to reduce threshold voltage and power consumption at the first and third stages and a push-pull topology exploiting the complementary characteristics of NMOS and PMOS transistors to enhance the linearity performance.
38 citations
TL;DR: In this article, two feeding designs for achieving dual orthogonal linear polarization operations of dielectric resonator (DR) antennas fed by microstrip lines are demonstrated, and the microstrip feedlines can be placed directly under the DR or conformal to the surface of the DR.
Abstract: Two feeding designs for achieving dual orthogonal linear polarization operations of dielectric resonator (DR) antennas fed by microstrip lines are demonstrated. The microstrip feedlines can be placed directly under the DR or conformal to the surface of the DR. Good dual-polarization excitation can be obtained for the two feeding designs. Experimental results for the return loss, isolation between two feeding ports, and radiation patterns are presented and discussed. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 222–223, 2001.
38 citations
TL;DR: A novel design of tapered dipole nanoantenna is introduced and numerically analyzed for energy harvesting applications where the antenna impedance, return loss, harvesting efficiency and field confinement are calculated using 3D finite element frequency domain method.
Abstract: In this paper, a novel design of tapered dipole nanoantenna is introduced and numerically analyzed for energy harvesting applications. The proposed design consists of three steps tapered dipole nanoantenna with rectangular shape. Full systematic analysis is carried out where the antenna impedance, return loss, harvesting efficiency and field confinement are calculated using 3D finite element frequency domain method (3D-FEFD). The structure geometrical parameters are optimized using particle swarm algorithm (PSO) to improve the harvesting efficiency and reduce the return loss at wavelength of 500 nm. A harvesting efficiency of 55.3% is achieved which is higher than that of conventional dipole counterpart by 29%. This enhancement is attributed to the high field confinement in the dipole gap as a result of multiple tips created in the nanoantenna design. Furthermore, the antenna input impedance is tuned to match a wide range of fabricated diode based upon the multi-resonance characteristic of the proposed structure.
38 citations
TL;DR: In this article, the authors present a multilayer image-reject filter implemented in a novel lumped-element stripline configuration in a standard low-temperature co-fired ceramic technology occupies an area of only 3.8 mm /spl times/ 2.4 mm and 0.5 mm.
Abstract: We present the design, implementation, and characterization of compact on-package integrated multilayer image-reject filters. The filter implemented in a novel lumped-element stripline configuration in a standard low-temperature cofired ceramic technology occupies an area of only 3.8 mm /spl times/ 2.4 mm /spl times/ 0.5 mm. A distinct feature of this filter is the optimal use of the parasitics of the lumped-element components to implement other components as an integral part of the filter by novel vertical deployments of planar structures. Measurement data of the prototype indicate 3 dB of insertion loss and 20 dB of return loss at the center frequency of 2.4 GHz, as well as 39-dB attenuation at the image frequency, suitable for Bluetooth applications. This paper demonstrates the feasibility of on-package integration of RF front-end elements where the transceiver module is built and, therefore, significantly reduces the development cost.
38 citations
TL;DR: In this paper, a compact ultra wideband 3dB quadrature coupler employing a microstrip/slot technology was proposed. But the design of the coupler was not discussed.
Abstract: This article presents the configuration and design method of a compact ultra wideband 3dB quadrature coupler employing a microstrip/slot technology. The proposed device uses two substrates with a common ground plane. It is formed by two identical multisection elliptical conducting strips, which are broadside coupled through a multisection elliptical slot in the ground plane. Results of simulation and measurements show that the coupler exhibits a coupling equal to 3 +/- 1 dB for the band 2.3-12.3 GHz. The isolation and return loss are better than 23 dB across that band. (C) 2007 Wiley Periodicals, Inc.
38 citations