• 제목/요약/키워드: Resonator Filters

검색결과 136건 처리시간 0.021초

Microstrip Slow-Wave Open-Loop Resonator Filters with Reduced Size and Improved Stopband Characteristics

  • Akkaraekthalin, Prayoot;Jantree, Jaruek
    • ETRI Journal
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    • 제28권5호
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    • pp.607-614
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    • 2006
  • This paper presents a new class of microstrip slow-wave open-loop resonator filters with reduced size and improved stopband characteristics. A comprehensive treatment of both ends loaded with triangular and rectangular ends is described, leading to the invention of a microstrip slow-wave open-loop resonator. Two-resonator and four-resonator bandpass filters are designed at the operating frequency of about 2 GHz, and a bandwidth of 60 MHz. The size of the slow-wave open-loop resonator is optimized from the standpoint of the unloaded Q-factor. The filters are not only compact in size due to the slow-wave effect, but also have a wider upper stopband resulting from the dispersion effect. The filter designs of this type are described in details. The experimental results are demonstrated and discussed.

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

  • ;김정무;김용권
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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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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Numerical Investigation of Tunable Band-pass\band-stop Plasmonic Filters with Hollow-core Circular Ring Resonator

  • Setayesh, Amir;Mirnaziry, Sayyed Reza;Abrishamian, Mohammad Sadegh
    • Journal of the Optical Society of Korea
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    • 제15권1호
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    • pp.82-89
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    • 2011
  • In this paper, we numerically study both band-pass and band-stop plasmonic filters based on Metal-Insulator-Metal (MIM) waveguides and circular ring resonators. The band-pass filter consists of two MIM waveguides coupled to each other by a circular ring resonator. The band-stop filter is made up of an MIM waveguide coupled laterally to a circular ring resonator. The propagating modes of Surface Plasmon Polaritons (SPPs) are studied in these structures. By substituting a portion of the ring core with air, while the outer dimensions of the ring resonator are kept constant, we illustrate the possibility of red-shift in resonant wavelengths in order to tune the resonance modes of the proposed filters. This feature is useful for integrated circuits in which we have limitations on the outer dimensions of the filter structure and it is not possible to enlarge the dimension of the ring resonator to reach to longer resonant wavelengths. The results are obtained by a 2D finite-difference time-domain (FDTD) method. The introduced structures have potential applications in plasmonic integrated circuits and can be simply fabricated.

Miniatured Planar Bandpass Filter Using Coupled Metamaterial Resonators

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
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    • 제9권3호
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    • pp.256-259
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    • 2011
  • In this article, new microstrip slow-wave bandpass filters using open loop resonator loaded with inter-digital capacitive fingers is proposed. The filter features not only compact in size, but also exhibits spurious stop-band rejection. Filters of this type with elliptic function and Chebyshev response are demonstrated. There is good agreement between experimental and full-wave electromagnetic (EM) simulation results.

고차진동을 이용하는 에너지포획형 압전 공진자와 필터의 변위분포에 관한 연구 (A Study on Particle Displacement Distributions of Energy-trapped Piezoelectric Resonators and Filters Utilizing the Harmonic Modes)

  • 이개명
    • 한국전기전자재료학회논문지
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    • 제11권11호
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    • pp.954-962
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    • 1998
  • Energy-trapped thickness vibrations of piezoelectric substrates are utilized in fabricating resonators and filters which have their operating frequencies in HF band. Normalized particle displacement distributions of the fundamental thickness shear vibration mode and overtone modes into the thickness direction in energy-trapped resonators and double-coupled filters were obtained by solving the wave equation and calculating the solved equations. These results show that as the number order of the harmonic mode in a energy-trapped resonator becomes larger, the degree of energy-trapping in the resonator increase, and if the conditions for energy-trapping become sufficiently weak, the energy-trapping effect of the harmonic mode which has the lower order disappears the earlier. Above simulation results were proved by the experiments.

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Ladder 형과 SCF 형의 구조를 가지는 FBAR 필터의 제작 (Fabrication of Film Bulk Acoustic Wave Filters with Ladder and Stacked Crystal Filter Types)

  • 임문혁;김동현;;윤기완
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2003년도 추계종합학술대회
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    • pp.630-632
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    • 2003
  • 본 논문에서는 Ladder 형과 SCF 형의 구조를 가지는 FBAR 필터의 제작에 대해 발표한다. 단위공진기의 구조는 W/SiO$_2$, 반사층을 갖는 SMR (Solidly Mounted Resonate.) 구조을 가지며, 21,200$\mu$m$^2$의 공진 면적을 갖는 단위공진기의 $K^2$eff, Q$_{s}$ 그리고 Q$_{p}$는 각각 3.24%, 6,363 그리고 6,749의 값을 보였다. 이와같은 성능을 갖는 단위공진기를 기본으로 제작된 필터의 크기는 Ladder 형이 800$\times$2000($\mu\textrm{m}$$^2$)의 크기를 갖고 SCF 형이 600$\times$500($\mu\textrm{m}$$^2$)을 가진다. 먼저 필터의 기본이 되는 박막형 공진기를 최적화시키고, 이를 바탕으로 Ladder 형과 SCF형의 구조를 가지는 FBAR 필터를 제작하여 성능을 비교하였다.다..

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Delay Measurement and Split-Step Time-Domain Analysis of Ring Resonator All-Pass Filters

  • Kim, Hyosuk;Ko, Yoonyoung;Moon, Hyunseung;Kim, Jaeseong;Chung, Youngchul
    • Journal of the Optical Society of Korea
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    • 제18권6호
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    • pp.766-771
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    • 2014
  • Single-ring all-pass filters with various coupling ratios are designed, fabricated, and characterized to assess the validity of the split-step time-domain modeling approach, which is considered for direct simulation of time-domain characteristics, such as optical delay, of various ring resonator devices. When the coupling ratio of the single-ring all-pass filter is 0.4 and 0.8, the delay time is measured to be about 145 and 42 ps respectively, which is comparable to the time-domain modeling results of 151 and 47 ps respectively. The measurements for two- and three-ring all-pass filters are also found to agree quite well with the simulation results. With these results it is confirmed that the split-step time-domain model could be efficiently incorporated into an optical-communication simulation module for ring resonator delay components in an all-optical packet switching system.

다양한 시간지연을 갖는 유전체 공진기 대역통과 필터의 구현 (Design and Implementation of Dielectric Resonator Bandpass Filters with Various Time-Delay)

  • 최우성;박노준
    • 한국정보통신학회논문지
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    • 제14권11호
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    • pp.2397-2402
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    • 2010
  • 본 논문에서는 800MHz 대역에서 다양한 시간자연 특성을 갖는 유전체 공진기 대역통과 필터를 설계 및 제작하였다. 각각의 경우에 삽입손실은 모두 2dB 이내이었고 ripple은 0.2dB 이내이었으며 반사손실은 20dB 이상의 값을 가지는 우수한 특성을 보였다. 지연시간의 경우에는 각각 6ns, 12ns, 20ns를 구현하였으며 이때 평탄도의 범위는 1ns 이내이었다. 또한 유전체 블록이 2-hole을 갖는 경우에는 2~4ns의 범위를 갖는 것을 확인하였으며 각각의 유전체 필터를 조합하여 다양한 지연시간을 갖는 유전체 공진기 필터를 구현하였다.

General Coupling Matrix Synthesis Method for Microwave Resonator Filters of Arbitrary Topology

  • Uhm, Man-Seok;Lee, Ju-Seop;Yom, In-Bok;Kim, Jeong-Phill
    • ETRI Journal
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    • 제28권2호
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    • pp.223-226
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    • 2006
  • This letter presents a new approach to synthesize the resonator filters of an arbitrary topology. This method employs an optimization method based on the relation between the polynomial coefficients of the transfer function and those of the $S_{21}$ from the coupling matrix. Therefore, this new method can also be applied to self-equalized filters that were not considered in the conventional optimization methods. Two microwave filters, a symmetric 4-pole filter with four transmission zeros (TZs) and an asymmetric 8-pole filter with seven TZs, are synthesized using the present method for validation. Excellent agreement between the response of the transfer function and that of the synthesized $S_{21}$ from the coupling matrix is shown.

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결합 메타물질 공진기를 이용한 소형화된 평면구조 대역통과여파기 (Miniatured Planar Bandpass Filter Using the Coupled Metamaterial Resonators)

  • 사당요;박영배;김기래
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2010년도 추계학술대회
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    • pp.371-374
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    • 2010
  • In this article, new microstrip slow-wave bandpass filters using open loop resonator loaded with inter-digital capacitive fingers is proposed. The filter features not only compact in size, but also exhibits spurious stop-band rejection. Filters of this type with elliptic function and Chebyshev response are demonstrated. There is good agreement between experimental and full-wave electromagnetic (EM) simulation results.

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