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利用方形开口谐振环、微带线和缺陷地结构建构了一种结构较为简单、便于调节的腔体型结构超介质。仿真结果表明,设计的超介质在1.0~3.6 GHz、3.8~7.1 GHz和7.2~8.0 GHz三个频段内均具有等效介电常数和等效磁导率小于零的左手材料特性。将超介质单元周期性地镶嵌在一种普通多频微带天线的介质基板内,实现了基于复合超介质基板天线。测试结果表明,在工作频率为1.61,3.44和3.9 GHz的微带天线中加载这种超介质结构覆层后,其谐振频率分别降低了60,70和40 MHz,同时将4.53~4.80 GHz和4.97~6.00 GHz两个工作频段扩展为4.6~6.0 GHz的超宽带。所设计的天线整体性能良好,且满足了WLAN在5 GHz通信频段的要求。
A kind of cavity-type structure supermedia which has a simple structure and is easy to adjust is constructed by using a square open-ended resonant ring, a microstrip line and a defect structure. Simulation results show that the designed supercapacitor has the equivalent dielectric constant and the left-handed material with equivalent permeability less than zero in three frequency bands of 1.0-3.6 GHz, 3.8-7.1 GHz and 7.2-8.0 GHz. The super-media unit is periodically embedded in the dielectric substrate of a common multi-frequency microstrip antenna to realize the composite super-media substrate antenna. The test results show that after loading the super-dielectric structure cladding in microstrip antennas with operating frequencies of 1.61, 3.44 and 3.9 GHz, the resonant frequencies are reduced by 60, 70 and 40 MHz, respectively, and 4.53 to 4.80 GHz and 4.97 ~ 6.00 GHz The two working frequency bands are extended to 4.6 ~ 6.0 GHz UWB. The overall design of the antenna good performance, and to meet the WLAN in the 5 GHz communications band requirements.