Design of a linear array antenna for shaped beam using genetic algorithm

A linear array antenna design with desired radiation pattern has been presented based on genetic algorithm (GA) approach. Examples of cosecant and flat‐topped beam patterns are illustrated to show the flexibility of GA to solve complex antenna synthesis problems by suitably selecting the fitness function, even with a simple GA. The results have been validated by IE3D electromagnetic simulation. The antenna arrays with different element geometries can also be implemented using the proposed technique. © 2008 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008.     

Design and Characterization of Solid-State LDMOS Based T/R Module

Solid-state transmit/receive modules (T/R) are the vital super components of the multifunction Active Phased Array Radars. The Active Phased Array Radar consists of several solid-state T/R module to achieve the required power aperture product. This paper describes the realization of S-band dual T/R module. The research consists of design, modelling, analysis challenges, realization, and characterization. Studied several solid-state devices such as silicon bipolar junction transistors moving on to laterally diffused metal oxide semiconductor (LDMOS). The study eventually overtaken by the advancement in gallium arsenide and gallium nitride. The LDMOS devices are designed to handle the required power and could support up to a 20% duty cycle. Based on commercial off-the-shelf devices, we have studied, analyzed their performance, presented trade-offs between different performance parameters, and proposed a common arm architecture for a set of requirements. Dual T/R modules consist of two identical TRMs having two independent RF antenna connectors and a common RF input/output connector. A detailed methodology and step-by-step results were presented for developing S-band T/R modules for multi-function Active Phased Array Radar applications.