| Antenna plays an important role in present communication system. The main work of my paper focused on the design and measurement of Yagi-Uda antenna.The first part of my work was the design and simulation of Yagi-Uda antenna, which based on the detection and direction of interference on the frequency band of GSM-R. In order to satisfy the requirement of detection and direction, we should manage to reach the following antenna parameters: high directional coefficient(>10dB); the bandwidth should cover frequency band of GSM-R( 885-934MHz),which meant the bandwidth be wider than 50MHz; HPBW (half-power-bandwidth of main lobe) should be less than 40°,1st side lobe should be lower enough(<-9dB); we should make a good balance between the high directional coefficient and antenna size for the convenience of moving carrying.There are various methods on the analysis of Yagi-Uda antenna. In this paper, four methods were introduced, they were voltage-induction method, the point of traveling wave, MOM combines optimum algorithm and software simulation. My design use electromagnetic software simulation, which were HFSS and FEKO. There are two part of my design: antenna and balun design. The horizontal and vertical polarization directional parameters were got, at the same time other parameters, Zin, VSWR, bandwidth, were also got. the dependability of two software was also validated through simulation.The second main part of my work was the measurement of antenna parameters, which include antenna calibration, antenna direction measurement, VSWR measurement. The measurement method and step were describe delicately through theory study and practice handle. The detail of measurement would be embodied in the paper.Finally, a new kind design of Yagi-Uda: antenna was introduced, which was totally compatible with any microstrip-based MMIC circuitry. This antenna was believed to find wide applications in wireless communication systems, power combining and phased arrays, as well as millimeter-wave imaging arrays. |
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