Low loss wideband patch antenna for EHF indoor systems

摘要

The design procedure for a low-loss wideband microstrip patch antenna to be used as the key element for an indoor phased array is adressed. For these indoor communications systems, wideband elements are required to support multimedia transmission and to minimize the requirements for external circuitry. A microstrip patch with stacked structures has been developed using the FDTD method and the results obtained are compared to those given by a commercial software package (Ensemble). The FDTD method is used to calculate the radioelectric characteristics (input impedance, S parameters, etc…) of the modeled antenna. This method can be applied to problem exhibiting a complex structure which otherwise may be very difficult to solve using other analytical or numerical methods. Also, it is a time domain method by which transient phenomena can be studied. Finally, the Fourier transform of the FDTD transient results gives frequency domain results over a wide spectrum. A development which leads to an impedance bandwidth over 13% and a minimum gain of 8 dB will be presented and discussed in view of the system requierements.