关键词：CRLH（复合右键左撇子）；可调超常材料；RF-MEMS；认知无线电
摘 要：In this paper, a novel active CRLH (Composite Right-Left Handed)Meta-material Antenna for cognitive radio using RF-MEMS (Micro-Electro-Mechanical-Systems) switches to realize reconfigurable radiation patterns is reported. The meta-materil consists of periodical J-shape patterns which have a CRLH (Composite Right Left Hand) property. RF-MEMS switches are used in each CRLH unit to tune the dispersion property. By discretely actuating the RF-MEMS switches through the DC feed voltage, its dispersion property is controlled, and the radiation pattern are tuned from the backward radiation to the broad-side and finally to forward in the frequency range between 9.55 GHz and 9.75 GHz. In addtition, different methods of RF-MEMS and antenna integration are discussed, and the number of RF-MEMS switches in each unit is studiud. The siginificance of MEMS switches to gain enhancement for reconfigurable antenna is investigated for the first time.