Development of cavity-backed antennas for use in communications applications
Carrie, Jeffrey S.
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In this thesis several antenna elements are designed for use in commercial and personal communications systems. The goal of the research is to model and fabricate working antennas capable of both linear and circular polarization for use in receive and transmit applications. A patch-fed cavity is developed for linearly polarized applications, while for circularly polarized antennas, the microstrip patch is replaced with circularly polarized dielectric resonator. The cavity antenna produces a gain of 12 dB over a 700MHz band-width at Ka-Band (20GHz) and over a 1GHz bandwidth at Ka-Band (30GHz). The research involves the simulation, design, testing and optimization of the antenna elements. Simulation involves the use of the Transmission Line Matrix (TLM) method to predict antenna performance. These simulations lead to the design of the antenna geometry which is fabricated and ested. Results of the initial design are discussed with respect to minimizing losses and improving antenna performance. The iterativeoptimization process leads to the final element.