Design and Implementation of Monopulse Antenna for Submillimeter Wavelengths’ Application


This communication presents the methodology design and implementation of a monopulse antenna based mostly on quasi-optical (QO) technology at submillimeter wavelengths. The designed monopulse antenna consists of QO add–distinction comparator, beam-waveguide (BWG) feed systems and Cassegrain twin reflector. The BWG system between the feed horn and QO total–distinction comparator is composed of spherical skinny lens, ellipsoid reflector mirrors, and plane mirrors. Four ellipsoid reflector mirrors are utilized for the BWG feed system between QO total–difference comparator and Cassegrain twin reflector. The parameters of all components are determined by using Gaussian beam theory. Then, the antenna configuration is simulated and slightly optimized by finite-distinction time-domain (FDTD) method combining with Stratton-Chu formulas. The simulated results have sensible performance at the middle frequency of 375 GHz, with the sidelobe levels below  dB in total patterns, the maximum null depth is approximately  dB and lower than zero.05-dB amplitude imbalance in distinction patterns. A prototype of the proposed monopulse antenna was manufactured and measured in the radiating close to-field zone. The presented measurement results agree well with the corresponding simulated results and validate the correctness of style indirectly. It indicates that this type of monopulse antenna presents an wonderful candidate for tracking systems at submillimeter wavelengths.

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