Development of an Integrated Staring Monopulse Receiver.
Final rept. Jul 94-Mar 96,
MICHIGAN UNIV ANN ARBOR DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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We have developed a novel high efficiency 94 GHz staring monopulse receiver. The receiver is based on four coplanar-waveguide fedcpw slot ring antennas followed by four cpw based subharmonic mixers which are pumped by a coaxialcpw 45-46 GHz local oscillator distribution network. The 2-4 GHz IF outputs are amplified and sent to a passive IF monopulse network which synthesizes the sum and difference patterns. The staring monopulse configuration is compatible with MMIC processing and can be fabricated at very low cost for large volume applications. Furthermore, this topology is easily extendable to fully polarimetric monopulse systems at 94 GHz. We have succeeded in building the 2x2 antenna array and in demonstrating 25 dB polarization isolation between the polarized ports. We have also fabricated a 7 dB subharmonic mixer which is, to our knowledge, the best 94 GHz MMIC mixer available to date. The monopulse IF network resulted in better than 30 dB null over a 1 GHz bandwidth. We believe that this design will lead to a low cost implementation of polarimetric W-band monopulse systems and are pursuing the effort under a continuing ARO contract.
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