Integrated Transceiver for Broad Band Short Distance Communication

The V-band of 60 GHz small mobile transceiver with integrated IF modem for millimeter-wave over fiber communication application is described in this paper. The transceiver is integrated with 60 GHz transmitter, receiver, wave guide band pass filter, 2x2 circular array antenna and IF modem in one module of small size 130 mm x 80 mm x 33 mm. The transceiver transmits the data rate of 155.52 Mbps and measured BER is better than 10E-7, INTRODUCTION Millimeter-wave over fiber (MOF) communication system in V-band is considered for the design of high data rate communication network in short distance application. The MOF has the advantage of long distance connection without high transmission loss through the fiber compare with the 60 GHz air link connection. This benefit can be used in the last one mile wireless connection or hot spot communication access. In general, this system consist of control station (CS), access point (AP), and mobile terminal (MT). Especially MT should have mobility and compact size for end user application. But the previous developed 60 GHz mobile transceiver has the bulk size without IF modem [1][2]. In this paper we describe 60 GHz small mobile transceiver (SMT) which is realized using the technologies of the broadband gap-coupled patch type microstrip line to rectangular waveguide transition, cavity type circular array antenna, integrated waveguide band pass filter, monolithic microwave integrated circuits (MMICs), simple configuration of frequency synthesizer, and integrated IF modem. The implemented transceiver is very compact size, high performance and this 60 GHz SMT can be installed in the wireless LAN or road-tovehicle communication conveniently. 60 GHz TRANSCEIVER CONFIGURATION The developed transceiver consists of one transmitter, one receiver, IF modem and this has the configuration of frequency division duplex (FDD) which is shown in Fig. 1. The transmitter frequency band is 61-62 GHz and the receiver use the frequency of 59-60 GHz. The isolation between transmitter and receiver is obtained by using the separate antenna and waveguide band pass filter with high suppression at out of pass band. In both transmitter and receiver the 2x2 circular waveguide array antenna is used. For transition between waveguide band pass filter and microstrip-line circuit, a wideband gap coupled patch type transition is used[3]. The antenna gain is 14 dBi at center frequency and 3 dB beamwidth is in horizontal and vertical plan. The waveguide band pass filter has an insertion loss of 1 dB with 3 dB bandwidth of 1 GHz, and the rejection is 60 dB at 2 GHz higher separation from the center frequency of 59.5 GHz in the receiver and the rejection of 40 dB at 2 GHz lower separation from the center frequency of 61.5 GHz in the transmitter, respectively. o 30 60 GHz Highly Integrated Small Mobile Terminal Antenna Amp O/E