Millimeter-wave Broadband Transceiver Components

Millimeter-wave Transceiver is an important part of Millimeter-wave Broadband Electronic Countermeasure Sytem. This thesis mainly focusses on the research of front-end of millimeter-wave broadband integrated solid-state transceiver and its key components..Based on Time Division Channel(TDC) technology, it is a brand new technical challenges to achieve the whole Ka-band multi-channel transmit and receive module by microwave&millimeter-wave hybrid integrated circuit technology. The multi-channel transceiver module is constituted by a transmit channel, four orientation-measurement receiver channels and a frequency-measurement receiver channel. The five-channel receiver completes the space of the azimuth, magnitude comparison and the function of measuring frequency. And the transmit channel fulfills the function of upconverting the microwave signal to Ka-band.The research of this thesis mainly focus on the issues of TDC's application in microwave&millimeter-wave, while some useful conclusions have been drawn as well. The main research work in the following areas:First of all, we introduce a new type of three-line coupled broadband filter (TLCBF), which resolves the suppression problem caused by resonant cavity and waveguide mode while the filter works on broadband. We deveplop a Ka-band dual-channel filter banks with low insertion loss and high rejection characteristics. Applying TLCBF into the narrow-band filter design, a four-channel full Ka-band filter-bank is developed.Second, based on the impendence matching theory, air-filled microstrip inter-connect structure is brought forward. The problem that the module is too large for the chip to be installed is resolved by adopting inter-connect technology and modulenize design method while ensuring the reliability of the system.Third, based on the PIN diode equivalent circuit, a detailed analysis is made for the switch characteristics when PIN diode is forward-bias. And we use PIN diode switch as attenuator to expand the dynamic range of receiver channels with the premise that the noise figure of the receiving system has not been significantly deteriorated.Finally, based on waveguide excitation theory and analysis of transition structures, the RF input/output transitions fitting for the full Ka-band are designed and maded.Test results show that: The output power of transmit channel is higher than 56mW. For frequency-measurement receiver channel, small-signal gain is greater than 30.7dB, noise figure less than 6.2.dB, large-signal gain larger than 0.7dB; and for four orientation-measurement receiver channels , small-signal gain is greater than 30.8dB, noise figure less than 5.6dB, large-signal gain larger than 0.8dB; adjacent receiver channel isolation greater than 50dB. Design specifications to meet the requirements.