基于耦合谐振去耦网络的双频近距天线解耦
Decoupling of Dual-Band Closely Spaced Antennas Based on Coupled Resonator Decoupling Network
  
DOI:
中文关键词:  去耦网络,双频,耦合谐振器,多输入多输出(MIMO)
英文关键词:decoupling network,dual-band,coupled resonator,MIMO
基金项目:国家自然科学基金(61372034)
作者单位
邹晓鋆1王光明1王亚伟1宗彬锋2 1. 空军工程大学防空反导学院,西安710051
2. 解放军94710 部队,无锡214000 
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中文摘要:
      提出了一种基于耦合谐振的双频去耦网络,并将其应用于一对二元双频近距单极子天线的解耦中。对去耦网络满足的去耦条件和匹配条件进行了推导;将网络以双频耦合谐振器的结构加以实现,提取了该结构的等效电路;基于去耦网络,设计了一副工作于WLAN 2. 45/5. 25 GHz 的二元双频近距单极子天线,天线阵元边缘间的距离为2. 45 GHz 时的0. 0735 λ0 和5. 25 GHz 时的0. 1575 λ0 ( λ0 为自由空间工作波长)。对未解耦天线和解耦后天线进行了仿真和测试,结果表明,通过加载去耦网络,2. 45 GHz 和5. 25 GHz 处的隔离度分别提高了24. 52 dB 和26. 57dB,且在两个频段内阻抗匹配良好、总的效率提高、通道容量增大。提出的去耦网络适用性强,结构紧凑且解耦高效,可应用于无线终端MIMO 技术中。
英文摘要:
      A dual-band decoupling network based on coupled resonator is proposed and applied to the decoupling of a pair of dual-band closely spaced monopole antennas. The decoupling and matching conditions that the network should satisfy are deduced. The network is realized by a dual-band coupled resonator, whose equivalent circuit is investigated. Based on the decoupling network, a pair of dual-band closely spaced monopole antennas working at WLAN 2. 45/5. 25 GHz is designed, the edge-to-edge distance of which is 0. 0735λ0 at 2. 45 GHz and 0. 1575 λ0 at 5. 25 GHz(λ0 is the free wavelength). Results from simulation and measurement on coupled antennas and decoupled antennas indicate that the isolation at 2. 45 GHz and 5. 25 GHz respectively improves 24. 52 dB and 26. 57 dB, with good impedance matching, improved total efficiency and increased channel capacity. Thus, the proposed decoupling network owns good applicability, compact size and effective decoupling capacity, and is promising in the application of wireless terminal MIMO.
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