• Title/Summary/Keyword: Wideband BPF

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Ultra-Wideband Band Pass Filter with Controllable Dual Notched Bands Using the CRLH Stubs (CRLH-Stub를 이용한 이중대역 저지 초광대역 대역통과 여파기)

  • Jung, Seung-Back;Yang, Seung-In
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.7
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    • pp.65-70
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    • 2012
  • In this paper, a compact UWB (Ultra Wideband) BPF(Band-Pass Filter) with dual notched bands is proposed using a hybrid Composited Right-Left Handed (CRLH) and Defected Ground Structure (DGS). To avoid the interferences such as Wireless LAN (Center frequency: 2.4GHz and 5.8GHz), the CRLH is employed to obtain the dual notched bands and the DGS is used to obtain the wide stop-band above the pass-band. The fabricated filter has good performance and has more than 30dB rejection at the center frequency of 2.4 GHz and 5.8GHz. The dual notched bands are easily movable by changing the CRLH parameter. Also the insertion loss is less than 0.4dB in the lower pass-band and 0.7dB in the upper pass-band, and it has small group delay variation less than 0.6ns. The size of the fabricated filter is very compact (17mm*17mm).

Lower Characteristic Impedance Based Compact f λ0/4 Short-Circuited Stub UWB Bandpass Filter with WLAN Stopband (저특성 임피던스의 λ0/4 단락 스터브 기술을 이용한 WLAN 저지 대역을 가지는 UWB BPF)

  • Hoa, Duong Thai;Joo, Hyo-Suk;Kim, Ihn-Seok
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.4
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    • pp.323-332
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    • 2009
  • In this paper, we introduce a modified short-circuited stub bandpass filter suitable for ultra-wideband(UWB) applications utilizing low temperature co-fired ceramic(LTCC) technology. By modifying the conventional short-circuited stub bandpass filter structure with stubs and connecting lines of lower characteristic impedances, the number of stubs has been reduced from 5 to 2 on a high dielectric constant substrate($\varepsilon_r$ = 40). A wireless local area network (WLAN) stopband in the frequency range of 5.15 to 5.825 GHz has been inserted into the filter characteristic using three short-circuited coupled lines. The filter has been measured with an insertion loss less than 1.0 dB and return loss better than 10 dB in the pass bands. A bandwidth ratio of 109.49 % has been achieved. Measurement results agree well with simulation results. The dimensions of the filter are $4{\times}8{\times}0.57\;mm^3$.

A Design of the UWB Bandpass Filter with a Good Performance of the Stopband, and Notched Band in Passband (우수한 차단 대역 특성과 통과 대역 내에 저지 대역을 갖는 UWB 대역 통과 필터 설계)

  • An, Jae-Min;Kim, Yu-Seon;Pyo, Hyun-Seong;Lee, Hye-Sun;Lim, Yeong-Seog
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.1
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    • pp.28-35
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    • 2010
  • In this paper, we designed and fabricated a ultra-wideband(UWB) bandpass filter with a good performance of a stopband, and a notched band in passband. The transformed equivalent circuit of the highpass filter was realized by distributed element. A wide-passband with 3-dB fractional bandwidth of more than 100 % was achieved by using optimum response of the HPF. For improving lower and upper stopband characteristic, a cross coupling between feed lines was employed, which was analyzed by desegmentation technique. In order to reject interference of Wireless LAN and Hyper LAN(5.15~5.825 GHz), the narrow notched(rejection) band was realized by a spurline. The fabricated BPF indicated the passband from 3.1 to 10.55 GHz and the flat group delay of less than 0.94 ns over the entire passband except the rejection band. The filter shown sharp attenuation both inside and outside the band and notched band from 5.2 to 6.12 GHz.