Design Fabrication And Analysis Of Fixed Frequency And Reconfigurable Microstrip Filtering Antennas

Abstract

As the realization of an effective and efficient multifunction module is inevitable and is the trend in achieving miniaturization for modern wireless systems, this research focuses on building up an integrated microstrip module called Filtering antenna (or Filtenna). This integrated module incorporates both filter and antenna in a single module, with high gain and high filter selectivity, appropriate for wireless applications namely LTE and WLAN. This integrated module eliminates the usage of impedance-matching network. The research also aims to realize the reconfigurability of filtering antenna. Focus is also laid upon implementing MIMO technology in filtering antennas. newline newline newlineIn this research, fixed and reconfigurable microstrip filtering antennas are designed and fabricated. Simulated values for parameters of the proposed filtering antennas, such as scattering parameters, surface current distribution, filter selectivity, gain, and radiation pattern are obtained using Computer Simulation Technology (CST); and the same are juxtaposed and compared with the experimental results obtained using E5062A Network Analyzer to assess the performance of the materialized antennas. newline newline newlineIn this research, the design and fabrication of fixed-frequency Filtering antennas include single-band, dual-band, and triband Filtering antennas. newline newline newline newlineA Fixed frequency filtering antenna operating in a single band with a center frequency 2.4 GHz is designed, and realized by filter synthesis design technique, wherein, the terminal resonator of the fifth- order stub-loaded parallel-coupled Chebyshev filter is substituted with an inverted-L monopole antenna. For this microstrip module, the roll- off rates of 87.75 dB/GHz and 76.83 dB/GHz at upper and lower band edges, respectively, are achieved; this, in turn, result in high filter selectivity. A passband gain of 3.1 dBi is obtained in this module. This filtering antenna is rendered compact with a size of 0.696 and#955;g×0.22 and#955;g and has good out-of-band suppression. newline newline newlineA Fixed d