A Compact Monopulse Radial Line Slot Array Antenna at Millimeter Wavelengths |
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Authors: | Lizhi You and W B Dou |
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Institution: | (1) State Key Lab of Millimeter Waves, Southeast University, Nanjing, 210096, People’s Republic of China |
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Abstract: | This paper describes the design and performance of a radial line slot array antenna (RLSA) which generates sum or difference
far field patterns. The antenna consists of rectangular waveguide to radial line transition, radial line and slot arrays etched
on the upper plate of the radial line. A novel rectangular waveguide to radial line transition is designed to build up the
dominate TEM mode in radial line to excite the slot arrays which are arranged in concentric rings on the upper plate of the
radial line. The antenna radiates linear polarization at Ka band. Monopulse operation is obtained by a sum and difference
network which is a compact eight-port comparator consisting of coplanar magic tees. The sum and difference network is waveguide
structure whose loss is less than that of microstrip structure at millimeter wave lengths. The monopulse performances can
be used in monopulse tracking and anti-collision application etc. Genetic algorithm (GA) is applied to optimize the parameters of the transition and antenna to obtain good performances.
Note: Part of this paper has been presented in the oral session ThuA5 on Transmission Lines and Antennas in IRMMW-THz2006 Conference, pages: 535.Number: 376636Title: Radial line slot array antenna at millimeter wave lengths |
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Keywords: | Monopulse radial line slot array antenna Rectangular waveguide to radial line transition Coplanar magic tee Millimeter wave |
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