• Title, Summary, Keyword: Bandstop

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A Design of Novel Compact Microstrip Bandstop Filters Based on Split-Ring Resonators and Spiral Resonators (Split-Ring 공진기와 Spiral 공진기를 이용한 새로운 소형의 마이크로스트립 대역 저지 필터 설계)

  • Lee, Jong-Hyuk;Oh, Young-Chul;Myung, Noh-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.7
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    • pp.796-808
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    • 2007
  • In this paper, two novel compact microstrip bandstop filters using complimentary split ring resonators(CSRRs) and spiral resonators is proposed. The first one is the bandstop filter using an array of CSRRs etched on the center line of a microstrip. The bandstop is due to the presence of negative effective permittivity and positive permeability near resonant frequency which prevent the wave propagation. The second on is the bandstop filter using an array of spiral resonators etched on the center line of a microstrip. The bandstop is due to the self-resonance of spiral circuit. We have achieved controllable resonance frequency and bandwidth, super compact dimension, low insertion losses in the passband and high level of rejection in the stopband with sharp cutoff. The electrical sizes of two proposed filter are very small. Additionally, they can be easily fabricated and compatible with MMIC or PCB technology.

Compact Tunable Bandstop Filter Using DOS Section (DGS 구조를 이용한 소형 가변 대역 억제 필터)

  • Sung, Young-Je
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.12
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    • pp.1333-1338
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    • 2008
  • In this paper, RF varactor diode are applied to the design of miniaturized and tunable bandstop filter. The proposed bandstop filter is based on a Defected Ground Structure(DGS) section topology. The designed tunable bandstop filter can achieve a significant size reduction by with loading capacitance component of varactor diode. It is observed from the measured results that the proposed tunable bandstop filter shows a wide tuning range of 42.9 % from 1.01 GHz to 1.99 GHz. The rejection level in the stopband is higher as the number of DGS section increases. In case of the proposed tunable bandstop filter with two DGS sections, the rejection level of the filter is better than 20 dB in the stopband during the tuning. In this case, the maximum insertion loss in the lower passband is 0.5 dB.

Tunable Bandstop Filter with Combined Right/Left-Handed Transmission Lines (Right/Left-Handed 전송 선로를 결합한 가변 대역 저지 필터)

  • Sung, Gyu-Je;Kim, Ell-Kou;Kim, Young;Yoon, Young-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.10
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    • pp.1122-1128
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    • 2008
  • A novel tunable bandstop filter was proposed. It is composed of a right-handed transmission line, which has lowpass characteristics, and a left-handed transmission line which has highpass characteristics. Dispersion relations for the unit cells of RHTL and LHTL were derived by the method of ABCD parameter analysis. Varactor diodes and chip inductors were used to make the unit cells of RHTL and LHTL. A tunable bandstop filter was designed and fabricated by the parallel connection of RHTL and LHTL. The measured results of the proposed tunable bandstop filter are agreed well with the simulated results.

Dielectric Waveguide Channel Dropping Filter (유전체 도파관을 이용한 채널 드로핑 필터)

  • 김신기;박동철;오승엽
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.25 no.1
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    • pp.1-7
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    • 1988
  • A new type broadband channel dropping filter which has a potential use as a millimeter-wave multiplexer has been realized by properly connecting 3-dB directional couplers and bandstop filters. 90\ulcorner3-dB directional couplers have been designed using two nonuniformly coupled dielectric image guides, while bandstop filters with Chebyshev passbands have been designed using dielectric image-guide grating structure. Effective dielectric constant method has been aplied to the image-guide dispersion analysis and to the design of bandstop gratings and 3-dB couplers. Experimental results in excellent agreement with computed responses are demonstrated.

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Frequency and bandwidth tuneable bandstop resonator (주파수와 대역폭 조정이 가능한 bandstop 공진기)

  • Liamas-Garro, Ignacio;Kim, Jung-Mu;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • pp.2392-2394
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    • 2005
  • This paper presents a tuneable bandstop resonator with two possible configurations, it can be used to tune its center frequency, or it can be used to tune its bandwidth. The tuneable bandstop resonator has potential application in microwave communications receivers, where it can be used to tune out interfering signals. The proposed resonator is comb actuated, where the resonator's displacement produces different values of frequency or bandwidth, this is achieved by decoupling electromagnetic energy from a main transmission line. The proposed fabrication process for the resonator is by anodic bonding pyrex glass and tow resistivity silicon, where the comb resonator structure is patterned by deep reactive ion etching (DRIE). This paper presents the resonator and actuator design in both configurations, as well as the fabrication process intended for its development.

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Ultra-wideband BSF Using Multi-stage FSCS (다단 FSCS를 이용한 초광대역 특성의 대역저지 필터)

  • Yun, Tae-Soon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.15 no.3
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    • pp.439-444
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    • 2020
  • In this paper, the analysis of the FSCS (frequency-selected coupling structure) as the coupling coefficient and multi-stage FSCS for enhanced bandstop bandwidth is suggested. The FSCS is composed by the connected coupled-line and open-stub. Basically, the resonance frequency of the FSCS is given by the electrical length of the stub, and the bandwidth is controlled by the coupling coefficient. Multi-stage FSCS is made by addition of another FSCS with the half electrical length. Manufactured bandstop filter using 3 stage FSCS is measured with the stopband of 177.3% and the maximum return loss of 1dB.

Wideband Bandstop Filter Based on Capacitively Coupled λ/4 Short-Circuited Lines

  • Duong, Thai Hoa;Kim, Ihn-Seok
    • Journal of electromagnetic engineering and science
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    • v.10 no.3
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    • pp.92-98
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    • 2010
  • A new wideband bandstop filter(BSF) with a sharp roll-off characteristic is introduced in a stripline structure in this paper. The BSF consists of two sections: the first is two capacitively coupled $\lambda/4$ short-circuited lines with opposite ground positions, while the second is a capacitively coupled $\lambda/4$ short-circuited line. The BSF provides three transmission zeros within the stopband and better than 22 dB rejection over the whole wireless local area network (WLAN) band from 5.15 to 5.825 GHz. The BSF, cascaded to an U.S. ultra-wideband(UWB: 3.1~10.6 GHz) band-pass filter(BPF), is simulated with HFSS and realized with low-temperature co-fired ceramic(LTCC) green tape with a dielectric constant of 7.8. The measurement results agree well with the HFSS simulation results. The size of the UWB BPF including the BSF is $3{\times}6.3\times0.45\;mm^3$.

Miniaturized Bandstop Filter Using Meander Spurline and Capacitively Loaded Stubs

  • Liu, Haiwen;Knoechel, Reinhard H.;Schuenemann, Klaus F.
    • ETRI Journal
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    • v.29 no.5
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    • pp.614-618
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    • 2007
  • A miniaturized bandstop filter (BSF) is introduced in this paper. The filter consists of one meander spurline and a pair of capacitively loaded stubs. The meander spurline with low resonant frequency and improved slow-wave factor exhibits excellent resonant bandgap characteristics which can be modeled by a longitudinally coupled resonator. The design of the proposed microstrip BSF is presented, and its performance is measured. Measurements show that there is a stopband from 2.3 to 5.6 GHz with $S_{21}$ less than -20 dB. The total length of this BSF equals 23 mm.

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Micromachined overlapped resonators for wide electromagnetic coupling ranges (광대역 전자기 커플링 용 미세 가공 중첩 공진기)

  • Liamas-Garro, Ignacio;Kim, Jung-Mu;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • pp.2389-2391
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    • 2005
  • In this paper, a compact S type resonator is presented, where the proposed resonator is surface micromachined over transmission lines or other resonators, in order to obtain a wide range of possible electromagnetic couplings. The structure has been applied in two compact, bandstop and bandpass filters with moderate fractional bandwidths (FBW) of 20% and 25% respectively. The bandstop filter presented, was designed by the combination of two design methods in order to obtain the proposed fractional bandwidth, where traditionally, coupled resonator bandstop filters have been used for narrow stopbands. The bandpass filter illustrates the use of the proposed suspended resonator structure to obtain a wide range of electric type coupling coefficients, and external quality factors for the filter. This paper describes the design methodology, concepts and fabrication method proposed for the design of these filters.

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Compact Planar Dual-Wideband Bandstop Filters with Cross Coupling and Open-Ended Stepped Impedance Resonators

  • Velidi, Vamsi Krishna;Sanyal, Subrata
    • ETRI Journal
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    • v.32 no.1
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    • pp.148-150
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    • 2010
  • This letter presents the design of a compact bandstop filter (BSF) operating at two frequencies. The proposed BSF consists of open-ended stepped impedance resonators (OSIR) and an end-shorted parallel-coupled microstrip line (E-PCML). The OSIRs are used to achieve the impedance-controlled stopband positions. The wide BSF bandwidths are achieved through enhanced coupling of the E-PCML. Explicit design guidelines are derived using a lossless transmission line model. To validate theoretical predictions, a prototype dual-band BSF operating at 900 MHz and 2,100 MHz with fractional bandwidths of 72% and 36%, respectively, is implemented in microstrip.