Dual-mode patch antenna switched by PIN diode

2003 IEEE Topical Conference on Wireless Communication Technology Pub Date : 2003-10-15 DOI:10.1109/WCT.2003.1321463

Q. Chen, M. Kurahashi, K. Sawaya

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引用次数: 11

Abstract

Since various wireless communication services are available, it is required to make a mobile terminal which can handle several such services. Therefore, it is necessary to design a multimode, multifrequency antenna which has different polarization and radiation patterns at each band; the switching of the resonant modes should be controlled electronically. We propose a dual-mode patch antenna where a PIN diode switch is used to change the resonant mode of the antenna. The basic structure of the antenna is a planar inverted F-shape antenna (PIFA) with a PIN diode at the open terminal of the patch. The PIN diode is switched by the DC bias which is provided at the RF feed. When the PIN diode is biased forward (ON), the antenna operates as a loop antenna, while when the PIN diode is biased backward (OFF), the antenna works as a PIFA. The characteristics of the antenna, such as resonant frequency, radiation pattern, and radiation efficiency are investigated experimentally and numerically. The antenna's resonant frequency and radiation characteristics can be changed by using the PIN diode switch, and the radiation efficiency degrades when forward-bias is added to the diode. The degradation of the radiation efficiency is mainly caused by high forward-bias resistance, which indicates that it is necessary to use a PIN diode with low forward-bias resistance.

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由PIN二极管开关的双模贴片天线

由于有多种无线通信业务，因此需要制造一种能够处理多种无线通信业务的移动终端。因此，有必要设计一种在每个频段具有不同极化和辐射方向图的多模多频天线;谐振模式的切换应由电子控制。我们提出了一种双模贴片天线，其中使用PIN二极管开关来改变天线的谐振模式。天线的基本结构是一个平面倒f形天线(PIFA)，在贴片的开放端有一个PIN二极管。PIN二极管由射频馈电处提供的直流偏置开关。当PIN二极管向前偏置(ON)时，天线作为环路天线工作，而当PIN二极管向后偏置(OFF)时，天线作为PIFA工作。实验和数值研究了天线的谐振频率、辐射方向图和辐射效率等特性。利用PIN二极管开关可以改变天线的谐振频率和辐射特性，在二极管上加正向偏置会降低天线的辐射效率。辐射效率的下降主要是由于高正向偏置电阻引起的，这表明有必要使用低正向偏置电阻的PIN二极管。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2003 IEEE Topical Conference on Wireless Communication Technology

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