基于单一左、右手传输线的宽带180°移相功分器
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摘要
分析了单一左、右手传输线的电路特性,并利用其非线性相位特性,设计了一种平面、低损耗的宽带180°移相功分器。首先通过调节单一左、右手传输线的结构参数,并与传统传输线进行相位比较,在单一左、右手传输线的通带内实现45°相位差,然后将4个传输线单元级联构建了180°移相器,最后采用180°移相器设计了相位差为180°移相功分器。移相功分器的测试结果表明,在3~8.3GHz内,反射系数小于-10dB,输出端口间的隔离度大于17dB,输出端口间的幅度差小于0.6dB,相位差为180°±5°。该结构性能优良,制作成本低,适用于宽带天馈系统。
By analyzing the circuit characteristics of simplified right/left handed transmission line(SRLH TL)and utilizing its nonlinear phase features,aplanar,low insertion loss 180°phase shift power divided is designed.Firstly,a 45°phase difference between the SRLH TL and the conventional TL is obtained by adjusting the parameters.Then,a 180°phase shift is designed based four cascaded units,which is utilized for broadband 180°phase shift power divider.The measured results indicated that the proposed 180°phase shift power divider achieves 3~8.3GHz bandwidth with return loss of less than-10 dB,isolation of more than 17 dB,magnitude difference of less than0.6dB and phase difference of 180°± 5°.The proposed divider has the features of good performance and low cost and is suitable for broadband antenna feed system.
By analyzing the circuit characteristics of simplified right/left handed transmission line(SRLH TL)and utilizing its nonlinear phase features,aplanar,low insertion loss 180°phase shift power divided is designed.Firstly,a 45°phase difference between the SRLH TL and the conventional TL is obtained by adjusting the parameters.Then,a 180°phase shift is designed based four cascaded units,which is utilized for broadband 180°phase shift power divider.The measured results indicated that the proposed 180°phase shift power divider achieves 3~8.3GHz bandwidth with return loss of less than-10 dB,isolation of more than 17 dB,magnitude difference of less than0.6dB and phase difference of 180°± 5°.The proposed divider has the features of good performance and low cost and is suitable for broadband antenna feed system.
引文
[1]LIN X Q,LIU R P,YANG X M,et al.Arbitrarily dualband components using simplified structures of conventional CRLH TLs[J].IEEE Transactions on Microwave Theory and Technique,2006,54(7):2902-2909.
[2]HAN W J,ZHAO J M,FENG Y J.Omni-directional microstrip ring antenna based on a simplified lefthanded transmission line structure[C]//Hangzhou:Proceedings of International Symposium on Biophotonics,Nanophotonics and Metamaterial,2006:467-470.
[3]GONG J Q,CHU Q X.SCRLH TL based UWB bandpass filter with widened upper stopband[J].Journal of Electromagnetic Waves and Applications,2008,22:1985-1992.
[4]HAN W J,FENG Y J.Ultra-wideband bandpass filter using simplified left-handed transmission line structure[J].Microwave and Optical Technology Letters,2008,50(11):2758-2762.
[5]WANG J,LIU B,ZHAO Y,et al.Wide upper-stopband super-UWB BPF based on SCRLH transmission line structure[J].Electronics Letters,2011,47(22):1233-1235.
[6]GONG J Q,CHU Q X.Miniaturized microstrip bandpass filter using coupled SCRLH zeroth-order resonators[J].Microwave and Optical Technology Letters,2009,51(12):2985-2989.
[7]PARK J,LEE Y.Dual-band branch line coupler based on composite right/left handed transmission lines with series capacitors only[J].Microwave and Optical Technology Letters,2010,52(5):1046-1048.
[8]WEI F,GAO C J,LIU B,et al.UWB bandpass filter with two notch-bands based on SCRLH resonator[J].Electronics Letters,2010,46(16):1134-1135.
[9]WEI F,WU Q Y,SHI X W,et al.Compact UWB bandpass filter with dual notched bands based on SCRLH resonator[J].IEEE Microwave and Wireless Components Letters,2011,21(1):28-30.
[10]安建,曾会勇,韦道知.基于简单复合左右手结构的宽带90°移相器[J].空军工程大学学报:自然科学版,2013,14(4):24-26.AN Jian,ZENG Huiyong,WEI Dao zhi.Broadband90°phase shift based on simplified composite right/left-handed structure[J].Journal of Air Force Engineering University:Natural Science Edition,2013,14(4):24-26.
[2]HAN W J,ZHAO J M,FENG Y J.Omni-directional microstrip ring antenna based on a simplified lefthanded transmission line structure[C]//Hangzhou:Proceedings of International Symposium on Biophotonics,Nanophotonics and Metamaterial,2006:467-470.
[3]GONG J Q,CHU Q X.SCRLH TL based UWB bandpass filter with widened upper stopband[J].Journal of Electromagnetic Waves and Applications,2008,22:1985-1992.
[4]HAN W J,FENG Y J.Ultra-wideband bandpass filter using simplified left-handed transmission line structure[J].Microwave and Optical Technology Letters,2008,50(11):2758-2762.
[5]WANG J,LIU B,ZHAO Y,et al.Wide upper-stopband super-UWB BPF based on SCRLH transmission line structure[J].Electronics Letters,2011,47(22):1233-1235.
[6]GONG J Q,CHU Q X.Miniaturized microstrip bandpass filter using coupled SCRLH zeroth-order resonators[J].Microwave and Optical Technology Letters,2009,51(12):2985-2989.
[7]PARK J,LEE Y.Dual-band branch line coupler based on composite right/left handed transmission lines with series capacitors only[J].Microwave and Optical Technology Letters,2010,52(5):1046-1048.
[8]WEI F,GAO C J,LIU B,et al.UWB bandpass filter with two notch-bands based on SCRLH resonator[J].Electronics Letters,2010,46(16):1134-1135.
[9]WEI F,WU Q Y,SHI X W,et al.Compact UWB bandpass filter with dual notched bands based on SCRLH resonator[J].IEEE Microwave and Wireless Components Letters,2011,21(1):28-30.
[10]安建,曾会勇,韦道知.基于简单复合左右手结构的宽带90°移相器[J].空军工程大学学报:自然科学版,2013,14(4):24-26.AN Jian,ZENG Huiyong,WEI Dao zhi.Broadband90°phase shift based on simplified composite right/left-handed structure[J].Journal of Air Force Engineering University:Natural Science Edition,2013,14(4):24-26.