Study On Microwave Photonic Crystal Structure And Its Application In Microstrip Amtenna

The photonic crystal is a new periodic structure which has a frequency band gap. This concept was first proposed in the optics field since the late1980s. By scaling its size, this kind of structure can be applied in a wide frequency band. It has received wide attention, and has been developing rapidly in the microwave region at the same time.This paper first introduces two kinds of simulation methods on microwave photonic crystal:the eigenvalue method and the method to solve S parameters using wave ports. In addition, we simulated the classical microwave photonic crystal models to validate these two methods.In the second place, in order to obtain a compact microwave photonic crystal, we propose a double-layer DUC-EBG structure. This structure has changed the classical UC-EBG structure. We can obtain the low frequency and wide bandwidth by increasing the equivalent inductance and capacitance of the resonant circuit. Simulation results show that the proposed structure has a lower frequency of band gap and wider bandwidth. Besides, this paper presents a new type of microwave photonic crystal structure (AUC-EBG) and the AUC-EBG structure with metal via hole. These two models make the structure more compact and more superior performance.Taking into account the ordinary microstrip antenna’s surface wave radiation and low efficiency, we conduct a preliminary study on the microstrip antenna using microwave photonic crystals. Microwave photonic crystals can effectively suppress the surface-wave of microstrip antenna, thereby improving the gain and improve direction pattern. Simulation results demonstrate that the EBG structure can improve the performance of ordinary microstrip antenna.