Nuevas Propuestas de Antenas para Aplicaciones en Satélites de Reducido Tamaño - Fase I

Abstract

This paper presents the design of four directional antennas with circular polarization for applications in small satellite implemented in microstrip technology for this purpose various excitation techniques are explored with the aim of improving the bandwidth of impedance and increase profit in the range of 2.4GHz to 2.45GHz. As a result of this process they were manufactured two of the designs presented the best simulation results namely a conventional reference antenna that uses shorted circular patch technology with excitation in two points by using a 90° hybrid coupler, to achieve circular polarization and improvement in axial relationship, apart from reducing its size versus previous developments proposed within the GRECO group. The proposed patch antenna shorted circular design achieves a bandwidth of 27.39% impedance at 2.295GHz to 3.025GHz range and a maximum gain of 5.04dBi for frequency 2.44GHz. The second built design is optimized by a genetic algorithm focused multiobjective solution to optimize bandwidth adaptation and coupling antenna suspended patch fed by proximity using two type probes 'L' antenna excited equally a 90° hybrid coupler with a 51.53 bandwidth% for the frequency range 1.93GHz and 3.27GHz, an improvement of 13.69% over the built reference antenna is obtained; an average gain of 8.15dBi for the frequency range 2.40GHz and 2.45GHz and generally improved bandwidth for a reference gain in 6.1dB of 26.47% from 2.13GHz to 2.78GHz understood is achieved. For the measurement of parameters a new methodology for measuring axial ratio and gain are proposed, which are validated by characterizing suspended patch antenna excited by type 'L' probes.