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
More filters
14 Jun 1993
TL;DR: In this article, a W-band probe based on a coaxial line design has been developed, with built-in bias tee, 2-dB insertion loss and better than 12-dB return loss from 75 GHz to 110 GHz.
Abstract: A W-band wafer probe based on a coaxial line design has been developed. With built-in bias tee, 2-dB insertion loss and better than 12-dB return loss from 75 GHz to 110 GHz are achieved. A probe without bias tee has 1.3-dB loss and 1.5-dB return loss at 94 GHz when optimized for narrowband application. S-parameters of discrete transistors and circuits have been accurately measured from 75 GHz to 110 GHz. The noise figure of active circuits has also been measured at W-band with these probes. >
44 citations
TL;DR: In this paper, the authors proposed a low-loss circulator for the 10.7 kmc to 11.7kmc band with a more than 30-db return loss at each terminal, an isolation of 30 db or greater between isolated terminals, and a 0.35db insertion loss between transmission terminals.
Abstract: The discovery of a simple, low loss way to hold Faraday rotation constant over a broad-band (coupled with the development of wide-band, high return loss, circular-to-rectangular waveguide transformers, and polarization couplers) has made it possible to design and build a high quality circulator for use in the 10.7 kmc to 11.7 kmc band. The essential characteristics of the described unit include a more than 30-db return loss at each terminal, an isolation of 30 db or greater between "isolated" terminals, and a 0.35-db insertion loss between transmission terminals.
44 citations
TL;DR: In this article, a low-loss and high Tx-to-Rx isolation single-pole double-throw (SPDT) millimeter-wave switch for true time delay applications is presented.
Abstract: This paper presents a low-loss and high Tx-to-Rx isolation single-pole double-throw (SPDT) millimeter-wave switch for true time delay applications. The switch is designed based on matching-network and double-shunt transistors with quarter-wavelength transmission lines. The insertion loss and isolation characteristics of the switches are analyzed revealing that optimization of the transistor size with a matching-network switch on the receiver side and a double-shunt switch on the transmitter side can enhance the isolation performance with low loss. Implemented in 90-nm CMOS, the switch achieves a measured insertion loss and Tx-to-Rx isolation of 1.9 and 39 dB at 60 GHz, respectively. The input 1-dB gain compression point is 10 dBm at 60 GHz, and the return loss of the SPDT switch ports is greater than 10 dB at 48-67 GHz.
44 citations
TL;DR: In this article, a new model for further reducing the size and increasing the bandwidth of a class of bandpass filter (BPF) utilizing multi-mode resonator is presented, and a new technique based on spiral transmission line loading to achieve higher BW and further size reduction is analyzed for this class of BPF.
Abstract: In this letter, a new model for further reducing the size and increasing the bandwidth (BW) of a class of bandpass filter (BPF) utilizing multi-mode resonator is presented. A new technique based on spiral transmission line loading to achieve higher BW and further size reduction is analyzed for this class of BPF. A compact ultra wideband microstrip BPF is proposed by using this technique. The capability of tuning the transmission zeroes in the proposed model is also studied. Estimates for the frequencies of these transmission zeroes are directly presented. The overall BW of the proposed BPF is shown to be increased more than 12.6% and its size to be reduced more than 70% compared with the conventional ones. The proposed BPF provides a relatively wide 3 dB fractional bandwidth of 72.6% frequency response with two transmission zeros at the lower and upper stop-bands to provide a very sharp cutoff and low passband insertion-loss and good return-loss characteristics.
44 citations
TL;DR: This paper numerically and experimentally demonstrate a substrate integrated plasmonic waveguide (SIPW) concept and its application in microwave bandpass filters and proposes a sharp roll-off microwave band pass filter based on this SIPW.
Abstract: In this paper, we numerically and experimentally demonstrate a substrate integrated plasmonic waveguide (SIPW) concept and its application in microwave bandpass filters. This SIPW consists of double arrays of slots etched on the top and bottom metal layers of a substrate integrated waveguide (SIW) to support spoof surface plasmon polariton (SSPP) modes with low and high cutoff frequencies. The simulated results show that by tuning the parameters of the SIPW's unit cell, the dispersion characteristics can be engineered at will. Then, we propose a sharp roll-off microwave bandpass filter based on this SIPW. This filter has a passband from 7.5 to 13.0 GHz with high return loss and low insertion loss. Furthermore, to demonstrate the independent tuning of the passband of the filter, we also design two microwave bandpass filters with passbands of 9.2-13.0 GHz and 7.5-10.5 GHz by decreasing the distance between two rows of via holes and increasing the slot length, respectively. Finally, to experimentally validate the filter designs, we fabricate and measure three prototypes and find that the experimental results are in excellent agreement with the simulations. This SIPW concept may have extensive potential applications in the development of various plasmonic integrated functional devices and circuits.
44 citations