Study And Design On Dual- Frequency Circular Polarization Microstrip Antenna

Wtih the development of the communication system, microstrip antenna is playing an increasingly important role in modern communication system. As the important components in communication system, its performance will have a direct impact on true whole communication system. In order to make the modern communication system can work in multiple frequency band, dual-frequency and multiple frequency band antenna has become the important antenna designer research topic. How to design miniaturization, high gain dual-band circularly polarized antenna, how to improve the circularly polarized antenna AR bandwidth, are fairly difficult technology. The ultimate goal of the paper is to study a two-layer dual-band circularly polarized antenna, adopt the traditional corner cut method, give the final simulation results and analysis. The main contents and contribution of the paper as follows:(a)The paper designed and researched the based on the line polarized antenna H aperture coupling feeder, analyzed the influence to the antenna performance by the each parameter of H aperture; Introduced circular polarization microstrip antenna, and designed the two-layer circular polarization microstrip antennas based on H aperture coupling feeder combining the related theory of circularly polarized antenna. The antenna adopted the method of making radiating element grounding to inhibit the surface wave, improved the antenna gain, adopted the corner cutting method to implement the antenna circular polarization.(b)The paper studied and designed the dual-frequency microstrip antenna circular polarization,firstly, the realization method of double frequency band antenna was introduced to study the dual-frequency circular based on coaxial feeder, using the square annular radiating element that use the coaxial probe carries on the feeder,giving the corresponding simulation results, the simulation results indicate that the dual-frequency circular polarized antenna working at 2.38GHz and 2.81GHz has high gain, good double-frequency characteristics and circular polarization characteristics.