Study Of The Mobile Communication Terminal Antenna

The main work of this paper is the study of the mobile communication terminal antenna. In recent years, the demand for miniaturization, multi-band, broadband and high gain has been presented with rapid development of mobile communications. Microstrip antennas feature compact in total size, small volume and light weight. They are able to meet the requirements of the mobile communication system to the antennas of mobile phones. Hence, they are widely used in the mobile communication system. However, some shortcomings of microstrip antennas such as low gain, narrow bandwidth, etc, make them unfit for practical application. Thus, the microstrip antenna, especially the monopole antenna and PIFA antenna are studied in detail in this paper. An emulator, HFSS of Ansoft, is used to calculate and simulate the internal handset antennas. In this paper, a monopole antenna(GPS), two dual-band PIFA antennas(GSM/DCS and GSM/PCS) and a 2.4GWLAN antenna are designed, and satisfying simulate results are got.Helical antenna satisfies the demand for the stubby antenna miniaturization. It has a rapid development in recent years. Hence, a stubby antennas of interphone, based on the theory of helical antenna and can operate at 420MHz~460MHz, is simulated and optimum designed by using HFSS. Then the antenna is made and measured. The experimental results are found to be in good agreement with the simulated results. Besides, the experimental results shows that the antenna has many advantages, such as small size, good consistency and low cost and so on.