低交叉极化水平的宽带滤波贴片天线
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摘要
提出了一种低交叉极化水平的宽带贴片滤波天线。在层叠式贴片与金属大地之间插入一对1/4波长短路谐振器,天线的通带内可出现3个反射零点,实现了拓展天线工作带宽的效果。在通带的高端出现两个反射零点,提高了天线的高端带外抑制水平。该天线与传统的微带贴片天线相比,具有宽频带、高增益、低交叉水平以及高端频率选择性的优势。为验证理论预期的可实现性,设计了中心频率在3.5 GHz的天线案例。仿真结果表明,该天线的剖面高度为0.1λ0,10 d B匹配带宽为22%,增益为8.4 dBi,交叉极化小于-30 dB。
Awideband filtering patch antenna with low cross-polarized level is proposed. By the insertion of the quarter-wavelength short-circuited resonator between the stacked patches and the ground, three reflection zeros appear in the pass band, which contributes to the enhancement of the bandwidth. The upper out-of-band suppression level is enhanced by the appeared radiation zeros. Compared with the traditional patch antenna, this antenna has the advantages of enhanced bandwidth and realized gain, low cross-polarized level and upper-band frequency selectivity. For verifying the theoretical prediction, one example is designed at 3.5 GHz. The simulated results show that the height of the design is 0.1λ0, the 10-d B matching bandwidth is 22%, the realized gain is 8.4 d Bi and the cross-polarization is below-30 d B.
Awideband filtering patch antenna with low cross-polarized level is proposed. By the insertion of the quarter-wavelength short-circuited resonator between the stacked patches and the ground, three reflection zeros appear in the pass band, which contributes to the enhancement of the bandwidth. The upper out-of-band suppression level is enhanced by the appeared radiation zeros. Compared with the traditional patch antenna, this antenna has the advantages of enhanced bandwidth and realized gain, low cross-polarized level and upper-band frequency selectivity. For verifying the theoretical prediction, one example is designed at 3.5 GHz. The simulated results show that the height of the design is 0.1λ0, the 10-d B matching bandwidth is 22%, the realized gain is 8.4 d Bi and the cross-polarization is below-30 d B.
引文
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[2]Kovitz J,Samii Y R.Using a thick substrates and capacitive probe compensation to enhance the bandwidth of a traditional CP patch antennas[J].IEEE Trans Antennas Propag,2014,62(10):4970-4979.
[3]Huynh T,Lee K F.Single-layer single-patch wideband microstrip antenna[J].Electron Lett,1995,31(16):1310-1312.
[4]《中国集成电路大全》编委会.中国集成电路大全(微波集成电路)[M].北京:国防工业出版社,1995.
[5]Polar D M.Microwave engineering[M].2nded.New York:Wiley,1998.
[6]Zuo J H,Chen X W,Han G R,et al.An integrated approach to RF antenna-filter co-design[J].IEEE Antennas and Wireless Propagation Letters,2009,8:141-144.
[7]Jiang Z H,Werner D H.A compact wideband circularly polarized co-designed filtering antenna and its application for wearable devices with low SAR[J].IEEE Trans Antennas Propag,2015,63(9):3808-3818.
[8]Wu Q S,Zhu L,Zhang X.Filtering patch antenna on aλ/4-resonator filtering technology:synthesis design and implementation[J].IET Microwave,Antennas&Propagation,2017,11(15):2241-2246.
[9]Chen X W,Zhao F X,Yan L Y,et al.A compact filtering antenna with flat gain response within the passband[J].IEEEAntennas Wireless PropagLett,2013,12(4):857-860.
[10]Mao C X,Gao S,Wang Y,et al.Dual-band patch antenna with filtering performance and harmonic suppression[J].IEEE Trans Amtennas Propag,2016,64(9):4074-4077.
[11]Ding B,Wei X B,Wang C,et al.A compact printed filtering antenna with flat gain using annular slot and UIR[C].Proc 15thInt Conf Electron Packag Technol,2014:1252-1255.
[12]Zhang X Y,Duan W,Pan Y M.High-gain filtering patch antenna and its application to LTE MIMO system[J].IEEETrans.Antennas Propag,2017,65:103-113.