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首页> 外文期刊>The mediterranean journal of electronics and communications >A MODIFIED MULTI FREQUENCY RECONFIGURABLE ANTENNA FOR WIRELESS COMMUNICATION
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A MODIFIED MULTI FREQUENCY RECONFIGURABLE ANTENNA FOR WIRELESS COMMUNICATION

机译：用于无线通信的改进型多频率可重构天线

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摘要

A growing need for portable devices has spawned considerable effort to develop suitable multiband antennas. The current communication system has been developed to the broadband and integration meanwhile people's needs for portable mobile communication are higher. This requires antenna development corresponding to broadband technology, multi-frequency technology and miniaturization. It is difficult to design an antenna covering several frequency bands. The drawbacks of Multiband and Broadband antennas are decrease in signal to noise ratio, efficiency and system complexity. This paper focuses the reconfigurable antenna tuned with a frequency response between 850 MHz and 4.5 GHz with high efficiency. The serious problem on multiband antennas are its poor out-of-band rejection compared to the frequency-reconfigurable antenna, hence additional filtering would be required in order for the antenna to attain better noise rejection. Multiband antenna solutions require very expensive stringent filters to improve their out of band rejection. Frequency reconfigurable antennas, on the other hand, have inherent band pass characteristics and generally have excellent out of band rejection without of filters. While reconfigurable antennas can have higher-order resonances, typically they are far away from the operating band and therefore can be removed with much less selective filters at a lower cost. It is essential that a fair cost comparison of these two alternatives include the cost of the filters required for both antennas. Such antennas are usually equipped with switches. Upon toggling the switch between on and off states, the antenna can be reconfigured to support a discrete set of operating frequencies. The observed results show that the performance characteristic of proposed antenna structure is excellent.
机译：对便携式设备的日益增长的需求已经产生了大量的努力来开发合适的多频带天线。当前的通信系统已经发展到宽带和集成，同时人们对便携式移动通信的需求也更高。这需要开发与宽带技术，多频技术和小型化相对应的天线。设计覆盖多个频带的天线是困难的。多频带和宽带天线的缺点是信噪比，效率和系统复杂性降低。本文重点关注可调谐天线，该天线在850 MHz至4.5 GHz之间的频率响应下进行了高效调谐。与频率可重新配置的天线相比，多频带天线上的严重问题是其较差的带外抑制能力，因此需要额外的滤波才能使天线获得更好的噪声抑制能力。多频带天线解决方案需要非常昂贵的严格滤波器来改善其带外抑制。另一方面，频率可重构天线具有固有的带通特性，并且在没有滤波器的情况下通常具有出色的带外抑制性能。尽管可重配置天线可能具有较高阶的谐振，但通常它们距离工作频带较远，因此可以用更少的选择性滤波器以较低的成本将其移除。这两个替代方案的合理成本比较必须包括两个天线所需的滤波器成本，这一点至关重要。这种天线通常配备有开关。在开和关状态之间切换开关时，可以将天线重新配置为支持一组离散的工作频率。观察结果表明，所提出的天线结构的性能特征是极好的。

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