• Title/Summary/Keyword: Bandstop

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Photonic band gap fomation by mircostrip ring

  • Jang, Mi-Young;Kee, Chul-Sik;Park, Ikmo;H. Lim
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.337-340
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    • 2001
  • We show that the microstrip ring with a narrow gap exhibits a photonic band gap (PBG) that is generally believed to be created by a periodic array. The discontinuity of impedance at the narrow gap induces the multiple reflections with fixed phase correlation necessary to make the PBG. We have also discussed the tuning of the PBG frequency by applying an external voltage on a varactor mounted on the gap and the applications of this PBG ring as a tunable bandstop filter and a microwave switch.

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A Study on the Synthesis of TE and TM Scattering Patterns of One-Dimensional Inhomogeneous Dielectric Media (일차원 비균질 유전매질의 TE 및 TM 산란패턴 합성에 관한 연구)

  • Nam, June-Seok;Jun, Sang-Jae;Jeon, Hoo-Dong;Jung, Jun-Sik;Park, Eui-Joon
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.69-73
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    • 2003
  • In this paper, a synthesis method for the desired scattering pattern is presented when illuminating by TE-polarized and TM-polarized plane waves to arbitrary dielectric material. It is considered that the one-dimensional dielectric media are inhomogeneously distributed with continuously varying dielectric constants. Accordingly the desired patterns and the corresponding source distributions are inversely transformed by the proposed algorithm which are based on the one-dimensional inverse scattering problem. Some bandstop spatial filter are illustrated for applications.

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Characterization of Ferroelectric Thin Film in Microwave Region (마이크로파대에서의 강유전 박막 유전 특성 평가)

  • Park, Jeong-Heum
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.10
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    • pp.1061-1067
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    • 2004
  • In this study, ferroelectric (Ba,Sr)TiO$_3$ and high temperature superconductor YBCO thin films were fabricated by PLD (Pulsed Laser Deposition) method and tuneable bandstop filters were implemented with two different IDC(Interdigital Capacitance) gap patterns, 20${\mu}{\textrm}{m}$ and 30${\mu}{\textrm}{m}$ using these two thin film layers. The resonant frequency was changed by DC bias voltage. By comparing measured results with simulation, the dielectric properties of ferroelectric thin film have been extracted. The permittivity was 820 ~ 900 at 30 K and had an acceptable error range but the loss tangent had a great difference, 0.018 in 30${\mu}{\textrm}{m}$ IDC gap pattern and 0.037 in 20 ${\mu}{\textrm}{m}$.

The Study of Microwave Band-Stop Filters with Narrow Stop-Band (마이크로파 광대역저지여파기에 로파기에 대한 연구)

  • Gang, Hyeong-Mok;Park, Han-Gyu;Jin, Cheol-Jae
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.7 no.1
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    • pp.1-8
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    • 1970
  • The band-stop filters which resonate at intervals of one-quarters, and three-quarters guide-wave length are designed and its frequency characteristics are measured. 2K25 klystrons (at 8000MC) were used as microwaves source. This bandstop filters were designed from low pass prototype and the Impedance of Impedance of these filters was made to be equal to one of the low pass prototype. It is demonstrated that the filters considered here, have narrow stop bandwidths and sharp characteristics in the stop band.

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Design of Microstrip Line Bandpass Filter using Photonic Bandgap Structures (Photonic Bandgap 구조를 이용한 마이크로스트립 라인 대역통과 여파기 설계)

  • 김태일;김명기;박익모;임한조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.4
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    • pp.611-621
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    • 2001
  • This paper presents a design methodology of bandpass filter by using defect modes in photonic bandgap (PBG) structures. PBG structures are realized with alternating section of microstrip line arranged in a periodical manner. A passband is created within the stopband of PBG structures with defect modes, which can be generated by changing the period of certain part of PBG structure. We also extract a simple equivalent circuit of a bandstop filter by using several LC sections.

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Millimeter Wave Filtres using a high Q MMIC Transmission Line (높은 Q값을 가지는 MMIC 전송선을 이용한 밀리미터파 필터)

  • Liamas-Garro, Ignacio;Kim, Yong-Sung;Baek, Chang-Wook;Kim, Yong-Kweon
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.2383-2385
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    • 2005
  • In this paper we discuss the design and fabrication of two millimeter wave filters, in bandpass and bandstop topologies for wireless communications applications. The filters are made using a high Q MMIC transmission line, which consists of a 100 micrometers tall, surface micromachined, air filled inverted microstrip structure on a quartz substrate, made by using a JSR THB-151N negative photoresist sacrificial layer mold and electroplating technology. The filter topologies include a new, very compact, four pole, cross-coupled filter, that presents a single transmission zero at the lower side of the passband, which provides a very sharp out of passband rejection at this region.

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A Study on the Synthesis of Dielectric Constant Potential for Arbitrary Inverse Scattering Pattern Using an Iterative Sampling Method (반복 샘플링법을 사용한 임의 역산란 패턴을 위한 유전율 포텐셜 합성에 관한 연구)

  • 남준석;박의준
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.40 no.10
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    • pp.150-158
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    • 2003
  • In the beam pattern synthesis problem using line source, the relationship between source distribution function and beam pattern may be represented by Fourier transform pair. In this paper, a general method to synthesize the line source distribution for a desired lobe-like beam pattern is presented by developing the nonlinear inversion method based on an iterative sampling technique. This method can be applied to the synthesis of continuously distributed dielectric constants satisfying the desired inverse scattering coefficient patterns when illuminating by TE-polarized and TM-polarized plane waves to arbitrary dielectric material. Furthermore this method can also be applied to the synthesis of transmission line with arbitrary reflection coefficient patterns. Some bandstop spatial filter and dispersive transmission line filter are illustrated for generality.

Miniaturized Microstrip Dual Band-Stop Filter Using Stepped Impedance Resonators (계단형 임피던스 공진기를 이용한 소형화된 마이크로스트립 이중 대역 저지 필터)

  • Kim, Gi-Rae;Park, Young-Bae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.8
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    • pp.1653-1658
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    • 2011
  • A novel circuit structure of dual-band bandstop filters is proposed in this paper. This structure comprises two shunt-connected tri-section stepped impedance resonators with a transmission line in between. Theoretical analysis from the equivalent circuit and design procedures are described. We represented graphs for filter design from the derived synthesis equations by resonance condition of circuits. Notably, advantages of the proposed filter structure are compact size in design, wide range of realizable resonance frequency ratio, and more realizable impedances.

Variable Dual Band Stop Filter Using 3-Stepped Impedance Resonators (3단 계단형 임피던스 공진기를 이용한 가변 이중 대역 저지 필터)

  • Kim, Gi-Rae;Kim, Yo-Seob
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.4 no.2
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    • pp.119-125
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    • 2011
  • A novel circuit structure of dual-band bandstop filters is proposed in this paper. This structure comprises two shunt-connected tri-section stepped impedance resonators with a transmission line in between. Theoretical analysis from the equivalent circuit and design procedures are described. We represented graphs for filter design from the derived synthesis equations by resonance condition of circuits. Notably, advantages of the proposed filter structure are compact size in design, wide range of realizable resonance frequency ratio, and more realizable impedances.

Frequency-Scanning Type Microwave Tag System Using Defected Ground Structures (결함 접지 구조를 이용한 주파수 스캐닝 방식의 마이크로파 태그 시스템)

  • Lee, Seok-Jae;Han, Sang-Min
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.3
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    • pp.247-252
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    • 2013
  • In this paper, a microwave tag system of a frequency-scanning type is proposed with multi-resonators using defected ground structures. While a conventional chip-based RFID stores time-sequential codes, the proposed type achieves pure passive tags by using multi-resonant bits over a frequency range. Moreover, the resonators of the spiral defected ground structures implemented on the back side of transmission lines have advantages of the excellent bandstop characteristics as well as the bit-error avoidance by the re-radiation on normal resonators. The proposed microwave tag is designed with UWB antennas at 3~7 GHz. From the experimental results in an anechoic chamber, it has been verified of the excellent recognitions for various 5-bits identification codes.