High power seven‐port microwave duplexer for monopulse radar tracking applications based on amplitude discriminator

Abstract

In this study, the design and analysis of a seven‐port radar duplexer for tracking a target in X‐band operation are presented. The S‐parameters of the structure are calculated and compared with experimental results. The simulations and experimental results are in good agreement. This device enables radars to calculate the horizontal difference, vertical difference, and sum of four beams of a monopulse antenna based on amplitude discriminator. Three magic‐Ts and one T‐junction are used, four input ports are connected to a monopulse antenna and three other ports are output ports. The output data give three equations between input signals that allow the radar to track a target. Results show that the S‐parameters of this device are affected by magic‐Ts and the T‐junction structure, and an optimum structure for the magic‐Ts and T‐junction is proposed. A comprehensive study has been carried out for determination and comparison of properties of the structure in theory, simulation, and experimental results. This device is useful in radar tracking systems.

Microstrip Gasper‐Peano fractal antenna for circular polarization applications

“…SOME benefits of circular polarization like reduction of multi‐path interference, independent of the position of the receiver and transmitter antenna, and reduction of Faraday's rotation loss caused to the circular polarization antennas become popular in wireless communications. The circular polarization array antenna can be used in the high gain, low side lobe level, beam forming, beam switching and phase array applications . The microstrip structures are cheap, light and easy to build which make them very favorite for designers.…”

A 2D substrate integrated waveguide monopulse slot antenna array with dual‐mode comparator

“…5,6 In conventional monopulse antennas, waveguide slot arrays and reflector antennas with monopulse feeders are used to achieve the monopulse performance. [7][8][9][10][11] Typically, such antennas are heavy and complicated, and expensive to fabricate. In recent years, planar monopulse antennas exhibit attractive advantages of small volume, low profile, simple structure, and convenient fabrication, 12,13 such as microstrip arrays and substrate integrated waveguide (SIW) slot arrays.…”

“…In conventional monopulse antennas, waveguide slot arrays and reflector antennas with monopulse feeders are used to achieve the monopulse performance 7–11 . Typically, such antennas are heavy and complicated, and expensive to fabricate.…”