%0 Journal Article
%T A 60 GHz Planar Diplexer Based on Substrate Integrated Waveguide Technology
%A Nikolaos Athanasopoulos
%A Dimitrios Makris
%A Konstantinos Voudouris
%J Active and Passive Electronic Components
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/948217
%X This paper presents a millimeter-wave, 60£¿GHz frequency band planar diplexer based on substrate integrated waveguide (SIW) technology. Diplexer consists of a pair of 5th-order SIW bandpass channel filters with center frequencies at 59.8£¿GHz and 62.2£¿GHz providing 1.67% and 1.6% relative bandwidths, respectively. SIW-to-microstrip transitions at diplexer ports enable integration in a millimeter-wave transceiver front end. Measurements are in good agreement with electromagnetic simulation, reporting very good channel isolation, small return losses, and moderate insertion losses in the passbands. The proposed SIW planar diplexer is integrated into a millimeter-wave transceiver front end for 60£¿GHz point-to-point multigigabit wireless backhaul applications, providing high isolation between transmit and receive channels. 1. Introduction The deployment of millimeter-wave integration technologies is critical for the wireless systems evolution. A variety of applications have been recently proposed in the frequency range between 60£¿GHz and 94£¿GHz including wireless networks [1], automotive radars [2], imaging sensors [3], and biomedical devices [4]. These systems require cost-effective technologies suitable for mass production and high density integration techniques, combined with a low-cost fabrication process. Substrate Integrated Waveguide (SIW) technology [5¨C8] is a promising candidate for providing compact, flexible, and cost-effective millimeter-wave circuits and systems which preserve most of the advantages of the conventional metallic waveguides, namely, complete shielding, low loss, high-quality factor, and high power handling capability [9]. Most of the classical passive components have been implemented in SIW technology. This solution usually permits to obtain components with a substantial reduction in size; moreover, the losses are lower than in the corresponding microstrip devices especially in the millimeter-wave frequency range, and there are no radiation and packaging problems. In the literature, SIW filters have received a particular attention. Focusing on the 60£¿GHz frequency band, in [10] a four-pole 60£¿GHz SIW bandpass filter has been modeled, while in [11] a 60£¿GHz SIW quasi-elliptic filter has been designed and fabricated. The diplexer is one of the key components in a transceiver front end and greatly affects system¡¯s performance acting as channel separator. This becomes evident in the frequency division duplex systems where frequency separation between transmit and receive chains needs to be provided. Diplexer design is usually based on
%U http://www.hindawi.com/journals/apec/2013/948217/