• Title/Summary/Keyword: coupled-line band-pass filter

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Fabrication of high-temperature superconducting low-pass filter for broad-band harmonic rejection (광대역 고조파 제거를 위한 고온초전도 저역통과필터의 제작)

  • Han, Seok-Gil;Kang, Gwang-Yong;Ahn, Dal;Suh, Jun-Seok;Choi, Chun-Geun;Kim, Sang-Hyeon;Kwak, Min-Hwan
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.193-196
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    • 2000
  • A new type low-pass filter design method based on a coupled line and transmission line theory is proposed to suppress harmonics by attenuation poles in the stop band. The design formula are derived using the equivalent circuit of a coupled transmission line. The new low-pass filter structure is shown to have attractive properties such as compact size, wide stop band range and low insertion loss. The seventh-order low-pass filter designed by present method has a cutoff frequency of 0.9 CHz with a 0.01 dB ripple level. The coupled line type low-pass filter with strip line configuration was fabricated by using a high-temperature superconducting (HTS : YBa$_2$Cu$_3$O$_{7-{\delta}}$ thin film on MgO(100) substrate. Since the HTS coupled tine type low-pass filter was proposed with five attenuation poles in stop band such as 1.8, 2.5, 4, 5.5, 6.2 GHz. The fabricated low-pass filter has improved the attenuation characteristics up to seven times of the cutoff frequency.

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A Study on The Design of Planer Comb-Line Bandpass Filter Using Equivalent Circuits of Asymmetrical Coupled Line (비대칭 결합선로 등가회로를 사용한 Comb-line 구조의 대역통과 여파기 설계)

  • Yun, Jae-Ho;Park, Jun-Seok;Kim, Hyeong-Seok
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.51 no.8
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    • pp.368-374
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    • 2002
  • In this paper, we introduce a procedure to obtain a equivalent circuit of comb-line band pass filter. By employing equivalent circuits of each asymmetrical coupled line. we composed the full equivalent circuit of comb-line bandpass filter and derived simple design equations for extracting each line's impedance. To show the validity of design equations, we simulated and fabricated a planar type comb-line bandpass filter, which has center frequency 1.8㎓, band-width 50㎒ and four resonators. The resulting filter is very compact, have broad stop band with the second pass band centered at four times the center frequency of the first pass band. The experimental results show exact performances of design specification.

A Design of High Temperature Superconducting Low-Pass Filter for Broad-Band Harmonic Rejection (광대역 고조파 제거용 고온초전도 저역통과 필터의 설계)

  • Kwak, Min-Hwan;Kim, Sang-Hyun;Ahn, Dal;Han, Seok-Kil;Kang, Kwang-Yong
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05b
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    • pp.78-81
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    • 2000
  • A new type low-pass filter design method based on a coupled line and transmission line theory is proposed to suppress harmonics by attenuation poles in the stop band The design formula are derived using the equivalent circuit of a coupled transmission line. The new low-pass filter structure is shown to have attractive properties such as compact size, wide stop band range and low insertion loss. The seventh-order low-pass filter designed by present method Ins a cutoff frequency of 0.9 GHz with a 0.01 dB ripple level. The coupled line type low-pass filter with stripline configuration was fabricated by using a high-temperature superconducting (HTS ; $YBa_2Cu_3O_{7-x}$) thin film on MgO(100) substrate. Since the HTS coupled line type low-pass filter was proposed with five attenuation poles in stop band such as 1.8, 2.5, 4, 5.5, 62 GHz. The fabricated low-pass filter has improved the attenuation characteristics up to seven times of the cutoff frequency Bemuse of good rejection of the spurious signals and harmonics, our low-pass filter is applicable to mobile base station systems such as cellular, personal communication systems and international mobile telecommunication(IMT)-2000 systems.

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Design of Coupled-line Band-pass Filter Using New Equivalent Circuit of Tapped-line (탭 선로의 새로운 등가 회로를 이용한 결합 선로 대역 통과 필터 설계)

  • Lee, Il-Woo;Han, Seung-Hyun;Yun, Tae-Soon;Kwoun, Sung-Su;Hong, Tae-Ui;Lee, Jong-Chul
    • 한국ITS학회:학술대회논문집
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    • v.2006 no.10
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    • pp.187-190
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    • 2006
  • In this paper, the equivalent circuit of tapped-line that is applied in the feeding of the band-pass filter with high coupling is suggested and the value of an equivalent circuit is mathematically defined. An equivalent circuit of tapped-line is composed by open stub and additional transmission line, and the electrical lengths of stub and line can be obtained by the impedance of resonator and the inverter. The new equivalent circuit of tapped-line can be simply applied of design of band-pass filter and leads to very good agreement compared with theoretical value. The coupled-line band-pass filter using equivalent circuit of tapped-line shows the insertion loss of 1.97 dB and the return loss of 18.5 dB at the center frequency of 5.8 GHz.

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A Band Pass Filter with Directly Coupled Feeding Structure Using K-Inverter (K-인버터를 이용한 직접 결합 급전 구조를 갖는 대역 통과 필터)

  • Kim, In-Seon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.6 s.121
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    • pp.639-647
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    • 2007
  • This paper proposed the novel method that can realize the parallel coupled line(PCL) band-pass filter with directly coupled feeding structure by means of transforming the first and last PCL sections of the conventional PCL band-pass filter into K-inverters, then substituting T-type equivalence for K-inverter. The proposed method supplies simple design formulae and can considerably reduce time and efforts needed to optimize filter performance when compared to reported methods using external Q or equivalent parameters. On the basis of the proposed method, the band-pass filter using directly coupled feeding structure and having 18% fractional bandwidth was designed and fabricated. The validity of proposed method was proven by the measured result.

A Parallel Coupled Line Band Pass Filter Using Defected Ground Structure Inverter (결함 기저면 구조 인버터를 이용한 평행 결합 선로 대역 통과 필터)

  • Kim, In-Seon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.1
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    • pp.54-60
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    • 2008
  • In this paper, the novel method is proposed to realize the parallel coupled line band pass filter using defected ground structure(DGS) inverter. This method provides simple solution which easily resolves the limit of line width happened due to high impedance on the occasion of designing filter composed of line inverter. On the basis of the proposed method and conventional method, the band pass filters haying 13.3% fractional bandwidth were designed and implemented. The measured data of two filters show usually good agreement with each other, but on the other hand the length of proposed filter become shorten about 15mm and the width of inverter line was expanded two times or more in comparison with conventional filter.

A Low-pass Filter with Wide-stop Band Using Radial-shaped Open Stub (광대역의 저지대역을 갖는 부채꼴 형태의 개방형 스터브를 이용한 저역통과 여파기)

  • Yoon, Ki-cheol;Kim, Seong-cheol
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.7
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    • pp.1237-1242
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    • 2016
  • In this paper, the low pass filter with harmonics suppression and rejection using parallel coupled-line and radial type open stub is presented. And the resultant characteristic of the proposed low pass filter is that the harmonics are suppressed and rejected in wide bandwidth due to the parallel coupled-line structure. The open stub of a low pass filter is constructed in radial type which can be used to adjust the size of filter. The size of the proposed low pass filter is $6.98{\times}7.60mm2$ and the cut off frequency is 2.45 GHz. And the filter is economical in unit cost and can be constructed easily and has the merit of mass product because the filter is composed of distributed element. Also, the widely rejected harmonics is 128 % in the bandwidth and the insertion and return losses of the low pass filter are 1.07 dB and 19.5 dB, respectively.

Design of Repeater Duplexer having High Attenuation Characteristics of 800 MHz band (800MHz대 중계기용 고감쇠특성을 갖는 듀플렉서 설계)

  • 전동석;한진우;이상석
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.393-396
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    • 2000
  • Repeater Duplexer of 800MHz band consists of 4pole transmitter band pass filter, receiver band pass filter and branch circuit. Circuit parameter of Duplexer such as coupled capacitance of equivalent circuit was drawn out and used to coupled line characteristics impedance (Zoo, Zoe) that satisfied resonator condition and attenuation condition. Simulation was carried out by the ADS(Advanced Design System) were obtained good attenuation characteristics (869~894MHz: 65㏈(Min.),824~349MHz: 65㏈(Min.)

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A Design of Hairpin Type Band-pass Filter with an Arbitrary Image Impedance and Coupled Line Length (임의의 영상 임피던스와 결합기를 갖는 hairpin형태의 대역통과 여파기 설계)

  • Lee, Dong-Hwan;Lee, Yong-Woo;Kim, Chul-Soo;Kim, Geun-Young;Park, Jun-Seok;Ahn, Dal
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.12
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    • pp.21-30
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    • 1999
  • Several kinds of design method for the hairpin type band-pass filter have been reported. The conventional design methods have some restrictions in characteristic impedance of coupled line section, which provide complexities to designer. In this paper, the novel design formulas for the hairpin type band pass filter have been derived and proposed to resolve the problems of the reported design methods. By employing the equivalent circuit of the coupled line section and band pass filter design theory, the design procedures and formulas are derived. The hairpin type RX/TX band pass filters for the IMT-2000 service have been designed, fabricated with duplexer configuration, and then measured to show the validity of the proposed design method.

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Compact Narrow Open-stub Band-pass Filter using FLCLM and Parallel Coupled line (FLCLM과 평행 결합 선로를 이용한 협대역 소형 개방형 스터브 대역통과 필터)

  • Hong, Tae-Ui
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.3
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    • pp.68-73
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    • 2011
  • In this paper, a compact-narrow open stub band-pass filter with parasitic-signal of low frequency range and second harmonics rejected using the parallel coupled line and FLCLM(Frquency Locked Controlled Length Method) is proposed. The characteristic of the parallel coupled line can be rejection for parasitic-signal of low frequency range and second harmonics. In last filter of experimental results show that insertion loss is 1.2 dB and return loss is 14.8 dB, and the fractional bandwidth is 10 % at the center frequency of 5.8 GHz. In additional, the rejection for parasitic-signal of low frequency range and second harmonics are 28.9 dB and 28.8 dB, respectively.