• Title/Summary/Keyword: Compact bandstop filter

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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.

Design of a Compact Bandstop Filter-combined UHF-band CRLH Bandpass Filter to Suppress the Spurious in L-band (L대역 불요파 저감을 위한, UHF대역 CRLH 대역통과 여파기와 소형 대역저지 여파기의 결합 설계)

  • Eom, Da-Jeong;Kahng, Sung-Tek;Mok, Se-Gyoon;Song, Choong-Ho;Woo, Chun-Sik;Park, Do-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.104-109
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    • 2012
  • In this paper, we propose a way to improve the quality of L-band wireless communication from unfriendly influential factors lying in the neighboring RF bands. The UHF-band system has resonator components and they generate harmonics as the spurious in the L-band. Therefore, a metamaterial CRLH bandpass filter is designed for the purpose of system miniaturization and smaller insertion loss, and its spurious phenomenon is observed in the frequency domain. And its harmonics in the L-band are suppressed by a compact bandstop filter whose equivalent circuit is newly developed. The design methodology is validated by the equivalent circuit to be compared with commercial full-wave EM software simulations, where the spurious is dropped by 20dB. Also, the advantage of the proposed design is presented by the comparison where our filter is much smaller than the conventional parallel edge coupled filter by over 50%, with excellent harmonic suppression.

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.

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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    • 2005.07c
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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 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.

Design of a Compact Lowpass Filter having Wide Bandstop Characteristics for Microwave and Millimeter-Wave Circuit Applications (마이크로파 및 밀리미터파 회로 응용을 위한 넓은 저지대역 특성을 지닌 소형의 저역 통과 여파기 설계)

  • 서재옥;박성대;김진양;강남기;이해영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.3
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    • pp.283-289
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    • 2003
  • In this paper, we proposed novel multilayer photonic bandgap(PBG) structure using DSL(Descended Signal Line). From measurement result, the proposed PBG structure using DSL is reduced 72 % at size and increased 13 % at bandwidth compared to typical multilayer DGS(Defected Ground Structure). It is also reduced 42 % at size and increased 23 % at bandwidth compared to PBG structure using EGP(Elevated Ground Plane). In case of measurement for manufactured six PBG patterns, all patterns have the same cutoff frequency and bandstop characteristics. So it can be used for bandstop filter having very precise tolerance of below 300 MHz at 20 ㎓ if it is applied to real product and this filter will be useful for small microwave integrated circuit and module development.

The Design of Microstrip Band-Selective Filter with Narrow Stopband for UWB Application (협대역 저지 특성을 가지는 UWB용 마이크로스트립 필터 설계)

  • Roh, Yang-Woon;Hong, Seok-Jin;Jung, Kyung-Ho;Jung, Ji-Hak;Choi, Jae-Hoon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.7-12
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    • 2005
  • A compact microstrip band-selective filter for ultra-wideband (UWB) radio system is proposed. The filter combines the traditional short-circuited stub highpass filter and coupled resonator bandstop filter on both sides of the mitered 50-ohm microstrip line. To realize the pseudo-highpass filtering characteristic over UWB frequency band (3.1 GHz to 10.6 GHz), a distributed highpass filter scheme is adopted. Three coupled resonators are utilized to obtain the band stop function at the desired frequency band. By meandering the coupled resonators, there is 29% reduction in footprint compared to the traditional bandstop filter using L-shaped resonators. The measured results show that the filter has a wide passband of 146.7 % (2.1 GHz to 10.15 GHz) with low insertion loss and the stop band of 7.42 % (5.32 GHz to 5.73 GHz) for 3-dB bandwidth. The measured group delay is less than 0.7 ns within the passband except the rejection band.

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Dual-Band Compact Broad Band-Pass Filter with Parallel Coupled Line (평행 결합 선로를 갖는 이중 대역의 소형 광대역 대역 통과 필터의 설계)

  • Choi, Young-Gu;Shrestha, Bhanu;Yoon, Ki-Cheol;Lee, Jeong-Hun;Hong, Tae-Ui
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.12
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    • pp.1423-1431
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    • 2010
  • In this paper, the dual-band compact broad bandpass filter using parallel coupled line is proposed. The proposed filter has reduced size and can be controlled bandwidth. And it is also possible to operate in the dual-band purpose. Futhermore, the inserted bandstop fiilter with T-type configuration is also possible to operate in the same purpose. The dual-band bandpass filter has the first operating frequencies and its bandwidth which are 5.8 GHz and 60 % respectively and the second operating frequency and the bandwidth are 16.2 GHz and 60 % respectively. The insertion loss and the return loss of the first frequency has 0.4 dB and 17.4 dB and the insertion loss and the return loss of the second frequency has 0.62 dB and 19.8 dB, respectively.

Split Ring Resonator-Based Bandstop Filter with an Enhanced Bandwidth (증가된 대역폭을 갖는 SRR 기반 대역 저지 여파기)

  • Woo, Duk-Jae;Lee, Taek-Kyung;Lee, Jae-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.5
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    • pp.544-552
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    • 2010
  • In this paper, a new method to enhance the stop bandwidth of the compact microstrip bandstop filter based on split ring resonator(SRR) was proposed. To achieve wide stop bandwidth, we incorporated the SRR within the circular etched pattern of the defected ground structure(DGS). By incorporating the SRR within the circular etched pattern, a high magnetic coupling between SRR and signal line can be achieved. The high magnetic coupling enables the proposed structure to achieve a wide stop bandwidth. To verify the feasibility of the proposed structure, the proposed bandstop filter was compared with conventional bandstop filter employing SRRs which have been etched at both sides of the signal line. Simulation and experimental results show that the proposed structure provides an enhanced stop bandwidth compared with the conventional structure.

Novel Oscillator Incorporating a Compact Microstrip Ring Type Resonant Cell with High Efficiency and Superior Harmonic Characteristics

  • Hwang Cheol-Gyu;Myung Noh-Hoon
    • Journal of electromagnetic engineering and science
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    • v.5 no.2
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    • pp.92-96
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    • 2005
  • This paper presents a novel microwave oscillator incorporating a simple microstrip ring type resonant cell as its terminating resonance component. Reduced chip size, higher dc-ac power efficiency, superior harmonic characteristics can be achieved from the introduction of a compact microstrip ring resonator cell. The oscillator provides a second harmonic suppression of 26.51 dB and the output power of 2.046 dBm at 2.11 GHz.