设计了一种微带线馈电的三频印刷天线，其辐射体有3个尺寸不同的矩形框嵌套而成，调整这些矩形框的长度和位置可以改变独立的电流路径，形成的频段用于WLAN和WiMAX系统。该天线结构简单，尺寸易于调节。测量结果显示：天线10dB阻抗带宽分别为400MHz（2．2～2．6GHz）、700MHz（3．28～3．98GHz）和1310MHz（5．15～6．46GHz），并且具有良好的辐射特性。%A tri-band printed antenna has been designed in this paper. It is fed by microstrip line. Three different rectangular rings are nested together, which can be formed the antenna's radiator. By adjusting the position and length of rings, the current paths can be changed independently. Therefore, three independent frequency bands, covered the WLAN and WiMAX system, have been formed. The antenna can be constructed and adjusted easily, and small in size. Measurement results show that it is with 10 dB impandence bandwidths of 400 MHz (2.2-2.6 GHz) ,700MHz (3.28-3.98 GHz),and 1 310 MHx (5.15-6.46 GHz). Measurements show the antenna with good emitting performance.
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