该文使用两种全波分析法对传统的带阻滤波器和一维复合左右手传输线(Composite Right/left-handed Transmission Line CRLH-TL)进行了数值分析,解决了多端口激励源的设置和多端口S参数提取的两大难点,计算结果分别与FEKO和电路模型等效...该文使用两种全波分析法对传统的带阻滤波器和一维复合左右手传输线(Composite Right/left-handed Transmission Line CRLH-TL)进行了数值分析,解决了多端口激励源的设置和多端口S参数提取的两大难点,计算结果分别与FEKO和电路模型等效法的分析结论进行了比较,吻合较好;并通过增加CRLH单元数得出电路模型等效法的不足,不仅验证了此激励源设置和S参数提取的正确性,也得出了CRLH-TL不同于传统右手传输线的一些左手特性,为分析、优化CRLH传输线以及CRLH漏波天线提供了一定的理论支持。展开更多
A new power divider, composed of a novel composite right/left-handed (CRLH) transmission line (TL) unit, is proposed. The properties of the power divider based on four CRLH TL unit cells are investigated theoretically...A new power divider, composed of a novel composite right/left-handed (CRLH) transmission line (TL) unit, is proposed. The properties of the power divider based on four CRLH TL unit cells are investigated theoretically. By adjusting the parameters of the capacitors and the inductors, the power divider shows perfectly symmetric power division at 5.13 GHz, return loss up to ?24 dB, with the transmitted power being close to ?3.1 dB. The phenomena are demonstrated by simulation results. Being compact in size and low-cost, the proposed power divider is very suitable for microwave and millimeter wave integrated circuits.展开更多
A quasi 0-dB coupler composed of a composite right-/left-handed transmission line (CRLH TL) and a conventional right-handed transmission line (RH TL) is presented. This coupler is shown to exhibit broad bandwidth and ...A quasi 0-dB coupler composed of a composite right-/left-handed transmission line (CRLH TL) and a conventional right-handed transmission line (RH TL) is presented. This coupler is shown to exhibit broad bandwidth and tight coupling char- acteristics. The circuit model and S-parameter results are also demonstrated. Another coupler with properly chosen loaded lumped-elements LL and CL in the CRLH TL is proposed to gain further understanding of the coupling mechanism. By adjusting the spacing between the CRLH TL and RH TL from 8 mm to 0.2 mm, it can be shown that backward coupling occurs in the left-handed region.展开更多
利用ABCD矩阵法分析得出:当传统微带线电长度为0°~180°时,低阻抗平衡CRLH TL可替代高阻抗传统微带线。根据分析结果,同时结合不等分Wilkinson功分器的设计原理,用特征阻抗为75?的CRLH TL代替274?的传统λ/4微带线,设计了一款...利用ABCD矩阵法分析得出:当传统微带线电长度为0°~180°时,低阻抗平衡CRLH TL可替代高阻抗传统微带线。根据分析结果,同时结合不等分Wilkinson功分器的设计原理,用特征阻抗为75?的CRLH TL代替274?的传统λ/4微带线,设计了一款工作于2.4 GHz,功分比为9:1的高功分比不等分功分器。测试结果表明:插入损耗S_(31)和S_(21)在工作频率处的差值为9.35 d B,回波损耗在2.29~2.5 GHz范围内小于–20 d B,隔离度在2~2.6GHz范围内小于–20 d B。展开更多
A compact dual-band quasi-elliptic filter with high selectivity is developed and investigated in this communication.It employs two hybrid-structure substrate integrated waveguide(SIW)triplets,which show completely inv...A compact dual-band quasi-elliptic filter with high selectivity is developed and investigated in this communication.It employs two hybrid-structure substrate integrated waveguide(SIW)triplets,which show completely inverse transfer responses under the same conditions of inductive cross coupling.The first meander-line-based triplet is able to produce a transmission zero(TZ)above the passband.Whereas the second SIW triplet,which is composed by a composite right/left-handed(CRLH)resonator,creates a TZ below the passband.By utilizing these features,a dual-band quasi-elliptic filter based on SIW dual-mode resonances(TE101 and TE201),whose operating frequencies are allocated at 8 GHz and 10 GHz,is designed for demonstration.The design process,principles,and experiments are carefully described in this communication.The measured and simulated results are in good agreement,indicating excellent electrical performance with low loss,compact device size and high selectivity.The most notable point is that a dual-band quasi-elliptic filter on SIW platforms is obtained with all inductive couplings for the first time,which shows a unique benefit in eliminating negative-coupling structures while permitting miniaturization for SIW dual-band filter design.展开更多
提出一种新颖的对偶复合左右手传输线(D-CRLH TL)结构单元,设计了一款小型化四阶宽带带阻滤波器。通过缝隙耦合形成左手电容和右手电感,位于结构下方的矩形贴片形成右手电容,与矩形贴片相连接的短截线形成左手电感。可以通过改变矩形贴...提出一种新颖的对偶复合左右手传输线(D-CRLH TL)结构单元,设计了一款小型化四阶宽带带阻滤波器。通过缝隙耦合形成左手电容和右手电感,位于结构下方的矩形贴片形成右手电容,与矩形贴片相连接的短截线形成左手电感。可以通过改变矩形贴片宽度和短截线的长度来调节带阻滤波器的中心频率和带宽。滤波器有效设计尺寸为11.5 mm×6.7 mm,等于0.23λ×0.13λ(λ为中心频率在自由空间的波长),尺寸较小。仿真测试结果表明该滤波器阻带中心频率为5.6 GHz,20 d B阻带带宽为50%,50 d B阻带带宽为30%。展开更多
The nonlinear properties of lattice network-based（LNB） composite right-/left-handed transmission lines（CRLH TLs）with nonlinear capacitors are experimentally investigated.Harmonic generation,subharmonic generation,...The nonlinear properties of lattice network-based（LNB） composite right-/left-handed transmission lines（CRLH TLs）with nonlinear capacitors are experimentally investigated.Harmonic generation,subharmonic generation,and parametric excitation are clearly observed in an unbalanced LNB CRLH TL separately.While the balanced design of the novel nonlinear TL shows that the subharmonic generation and parametric processes can be suppressed,and almost the same power level of the higher harmonics can be achieved over a wide bandwidth range,which are difficult to find in conventional CRLH TLs.展开更多
文摘该文使用两种全波分析法对传统的带阻滤波器和一维复合左右手传输线(Composite Right/left-handed Transmission Line CRLH-TL)进行了数值分析,解决了多端口激励源的设置和多端口S参数提取的两大难点,计算结果分别与FEKO和电路模型等效法的分析结论进行了比较,吻合较好;并通过增加CRLH单元数得出电路模型等效法的不足,不仅验证了此激励源设置和S参数提取的正确性,也得出了CRLH-TL不同于传统右手传输线的一些左手特性,为分析、优化CRLH传输线以及CRLH漏波天线提供了一定的理论支持。
基金Project supported by the National Natural Science Foundation of China (Nos. 60577023 and 60378037), the National Basic Research Program (973) of China (No. 2004CB719802), China Postdoctoral Science Foundation, and Education Ministry Key Laboratory of Photoelectric Information Technology Science Foundation (No. 2005-20), China
文摘A new power divider, composed of a novel composite right/left-handed (CRLH) transmission line (TL) unit, is proposed. The properties of the power divider based on four CRLH TL unit cells are investigated theoretically. By adjusting the parameters of the capacitors and the inductors, the power divider shows perfectly symmetric power division at 5.13 GHz, return loss up to ?24 dB, with the transmitted power being close to ?3.1 dB. The phenomena are demonstrated by simulation results. Being compact in size and low-cost, the proposed power divider is very suitable for microwave and millimeter wave integrated circuits.
基金Project supported by the National Basic Research Program (973) of China (No. 2004CB719802) and the National Natural Science Foun-dation of China (No. 50477048)
文摘A quasi 0-dB coupler composed of a composite right-/left-handed transmission line (CRLH TL) and a conventional right-handed transmission line (RH TL) is presented. This coupler is shown to exhibit broad bandwidth and tight coupling char- acteristics. The circuit model and S-parameter results are also demonstrated. Another coupler with properly chosen loaded lumped-elements LL and CL in the CRLH TL is proposed to gain further understanding of the coupling mechanism. By adjusting the spacing between the CRLH TL and RH TL from 8 mm to 0.2 mm, it can be shown that backward coupling occurs in the left-handed region.
文摘利用ABCD矩阵法分析得出:当传统微带线电长度为0°~180°时,低阻抗平衡CRLH TL可替代高阻抗传统微带线。根据分析结果,同时结合不等分Wilkinson功分器的设计原理,用特征阻抗为75?的CRLH TL代替274?的传统λ/4微带线,设计了一款工作于2.4 GHz,功分比为9:1的高功分比不等分功分器。测试结果表明:插入损耗S_(31)和S_(21)在工作频率处的差值为9.35 d B,回波损耗在2.29~2.5 GHz范围内小于–20 d B,隔离度在2~2.6GHz范围内小于–20 d B。
基金supported in part by the Natural Sciences and Engineering Research Council(NSERC)of Canadain part by the China Scholarship Council(Grant No.202006070154).
文摘A compact dual-band quasi-elliptic filter with high selectivity is developed and investigated in this communication.It employs two hybrid-structure substrate integrated waveguide(SIW)triplets,which show completely inverse transfer responses under the same conditions of inductive cross coupling.The first meander-line-based triplet is able to produce a transmission zero(TZ)above the passband.Whereas the second SIW triplet,which is composed by a composite right/left-handed(CRLH)resonator,creates a TZ below the passband.By utilizing these features,a dual-band quasi-elliptic filter based on SIW dual-mode resonances(TE101 and TE201),whose operating frequencies are allocated at 8 GHz and 10 GHz,is designed for demonstration.The design process,principles,and experiments are carefully described in this communication.The measured and simulated results are in good agreement,indicating excellent electrical performance with low loss,compact device size and high selectivity.The most notable point is that a dual-band quasi-elliptic filter on SIW platforms is obtained with all inductive couplings for the first time,which shows a unique benefit in eliminating negative-coupling structures while permitting miniaturization for SIW dual-band filter design.
文摘提出一种新颖的对偶复合左右手传输线(D-CRLH TL)结构单元,设计了一款小型化四阶宽带带阻滤波器。通过缝隙耦合形成左手电容和右手电感,位于结构下方的矩形贴片形成右手电容,与矩形贴片相连接的短截线形成左手电感。可以通过改变矩形贴片宽度和短截线的长度来调节带阻滤波器的中心频率和带宽。滤波器有效设计尺寸为11.5 mm×6.7 mm,等于0.23λ×0.13λ(λ为中心频率在自由空间的波长),尺寸较小。仿真测试结果表明该滤波器阻带中心频率为5.6 GHz,20 d B阻带带宽为50%,50 d B阻带带宽为30%。
基金supported by the National Natural Science Foundation of China(Grant Nos.61201030,60990322,and 60990320)the China Postdoctoral Science Foundation(Grant No.2012M521048)the Collegiate Natural Science Fund of Jiangsu Province,China(Grant No.12KJB140010)
文摘The nonlinear properties of lattice network-based（LNB） composite right-/left-handed transmission lines（CRLH TLs）with nonlinear capacitors are experimentally investigated.Harmonic generation,subharmonic generation,and parametric excitation are clearly observed in an unbalanced LNB CRLH TL separately.While the balanced design of the novel nonlinear TL shows that the subharmonic generation and parametric processes can be suppressed,and almost the same power level of the higher harmonics can be achieved over a wide bandwidth range,which are difficult to find in conventional CRLH TLs.
