小型高带外抑制超宽带滤波器设计
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摘要
为了提高滤波器的带外噪声抑制,并兼顾小型化,提出了一种新型超宽带滤波器设计。首先,利用分路电磁耦合结构在通带两侧实现了2个传输零点,通过调节中间金属片与螺旋缺陷地可实现对2个零点的单独调节,由此实现了高带外抑制,且有利于滤波器的小型化;然后,利用基片集成波导与周期性缺陷地结构,在进一步提高频率选择性的同时,实现了较好的阻带性能;最后,设计并加工了一款工作频率为8.1 GHz、带宽为67%的滤波器。结果表明,仿真与测试结果吻合良好,证明了该设计方法的可靠性。
A novel design of ultra-wideband(UWB) filter is proposed aiming to realize high stopband rejection and take into account the miniaturization. Firstly, with separate electric and magnetic coupling path(SEMCP) topology, two transmission zeros(TZs) are produced above and below the passband which can be independently controlled by simply tuning dimensions of the floating metal patch and spiral defect ground structure(DGS), thus achieving high stopband attention are facilitated the miniaturization of filter. Then, by using substrate integrated waveguide(SIW) with periodical DGS, better stopband performance is achieved while further improving the frequency selectivity. Finally, a filter works at 8.1 GHz with bandwidth of 67% is designed and fabricated. The simulation results are in good agreement with the test results, which proves the reliability of the design method.
A novel design of ultra-wideband(UWB) filter is proposed aiming to realize high stopband rejection and take into account the miniaturization. Firstly, with separate electric and magnetic coupling path(SEMCP) topology, two transmission zeros(TZs) are produced above and below the passband which can be independently controlled by simply tuning dimensions of the floating metal patch and spiral defect ground structure(DGS), thus achieving high stopband attention are facilitated the miniaturization of filter. Then, by using substrate integrated waveguide(SIW) with periodical DGS, better stopband performance is achieved while further improving the frequency selectivity. Finally, a filter works at 8.1 GHz with bandwidth of 67% is designed and fabricated. The simulation results are in good agreement with the test results, which proves the reliability of the design method.
引文
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[3] SHAMAN H,ALAMOUDI A,ALMORQI S.Millimeter-wave ultra-wideband (UWB) bandpass filter(BPF) using microstrip parallel coupled lines[C]//Doha:2016 IEEE Wireless Communications and Networking Conference,2016:1-4.
[4] ZHOU C X,GUO P P,ZHOU K,et al.Design of a compact UWB filter with high selectivity and superwide stopband [J].IEEE Microw Wireless Compon Lett,2017,27(7):636-638.
[5] TRIPTA,GHAZALI A N.Broadside-coupled UWB filter for indoor communication systems [C]// Chennai:2016 International Conference on Wireless Communications,Signal Processing and Networking (WiSPNET), 2016:2417-2420.
[6] DUONG T H,KIM I S.New elliptic function type UWB BPF based on capacitively coupled λ/4 open T resonator [J].IEEE Trans Microw Theory Tech,2009,57(12):3089-3098.
[7] CHEN T A,WEI S C,CHOU P J,et al.Parallel-coupled filters using stepped-impedance coupled lines [C]//Taipei:2016 IEEE International Symposium on Radio-Frequency Integration Technology(RFIT),2016:1-3.
[8] WANG H,TAM K W,HO S K,et al.Design of ultra-wideband bandpass filters with fixed and reconfigurable notch bands using terminated cross-shaped resonators [J].IEEE Trans Microw Theory Tech,2014,62:252-265.
[9] LIM J S,KIM C S,LEE Y T,et al.A spiral-shaped defected ground structure for coplanar waveguide[J].IEEE Microw Wireless Compon Lett,2002,12(9):330-332.
[10] MUNIR A,WULANDARI B D,ADITOMO W,et al.DGS-based UWB microstrip bandpass filter and its equivalent circuit [C]// Johor Bahru:2017 IEEE 13th Malaysia International Conference on Communications (MICC),2017:70-73.
[11] KAMMA A,DAS R,BHATT D,et al.Multi-mode resonators based triple band notch UWB filter[J]. IEEE Microw Wireless Compon Lett,2017,27(2):120-122.
[12] CHU Q X,QIU L L.Wideband balanced filters with high selectivity and common-mode suppression[J]. IEEE Trans Microw Theory Tech,2015,63(10):3462-3468.
[13] GUO X,ZHU L,WU W.Strip-loaded slotline resonators for differential wideband bandpass filters with intrinsic common-mode rejection[J]. IEEE Trans Microw Theory Tech,2016,64(2):450-458.
[2] ZHU H,CHU Q X.Compact ultra-wide band (UWB) bandpass filter using dual-stub-loaded resonator (DSLR) [J]. IEEE Microw Wireless Compon Lett,2013,23(10):527-529.
[3] SHAMAN H,ALAMOUDI A,ALMORQI S.Millimeter-wave ultra-wideband (UWB) bandpass filter(BPF) using microstrip parallel coupled lines[C]//Doha:2016 IEEE Wireless Communications and Networking Conference,2016:1-4.
[4] ZHOU C X,GUO P P,ZHOU K,et al.Design of a compact UWB filter with high selectivity and superwide stopband [J].IEEE Microw Wireless Compon Lett,2017,27(7):636-638.
[5] TRIPTA,GHAZALI A N.Broadside-coupled UWB filter for indoor communication systems [C]// Chennai:2016 International Conference on Wireless Communications,Signal Processing and Networking (WiSPNET), 2016:2417-2420.
[6] DUONG T H,KIM I S.New elliptic function type UWB BPF based on capacitively coupled λ/4 open T resonator [J].IEEE Trans Microw Theory Tech,2009,57(12):3089-3098.
[7] CHEN T A,WEI S C,CHOU P J,et al.Parallel-coupled filters using stepped-impedance coupled lines [C]//Taipei:2016 IEEE International Symposium on Radio-Frequency Integration Technology(RFIT),2016:1-3.
[8] WANG H,TAM K W,HO S K,et al.Design of ultra-wideband bandpass filters with fixed and reconfigurable notch bands using terminated cross-shaped resonators [J].IEEE Trans Microw Theory Tech,2014,62:252-265.
[9] LIM J S,KIM C S,LEE Y T,et al.A spiral-shaped defected ground structure for coplanar waveguide[J].IEEE Microw Wireless Compon Lett,2002,12(9):330-332.
[10] MUNIR A,WULANDARI B D,ADITOMO W,et al.DGS-based UWB microstrip bandpass filter and its equivalent circuit [C]// Johor Bahru:2017 IEEE 13th Malaysia International Conference on Communications (MICC),2017:70-73.
[11] KAMMA A,DAS R,BHATT D,et al.Multi-mode resonators based triple band notch UWB filter[J]. IEEE Microw Wireless Compon Lett,2017,27(2):120-122.
[12] CHU Q X,QIU L L.Wideband balanced filters with high selectivity and common-mode suppression[J]. IEEE Trans Microw Theory Tech,2015,63(10):3462-3468.
[13] GUO X,ZHU L,WU W.Strip-loaded slotline resonators for differential wideband bandpass filters with intrinsic common-mode rejection[J]. IEEE Trans Microw Theory Tech,2016,64(2):450-458.