• Title, Summary, Keyword: 삽입손실

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Compact and Low Insertion Loss Dual-Mode Resonator and Its Applications for Switchable Filters (낮은 삽입손실을 갖는 소형 이중모드 공진기와 스위치 기능을 가진 여파기로의 응용)

  • 성영제;김보연;이건준;김영식
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.3
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    • pp.301-310
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    • 2004
  • In this paper, a compact dual-mode filter structure without coupling gaps is proposed. The novel design is achieved by embedding a pair of equal crossed slots and spur-lines. Without coupling gaps between feed lines and patch resonator, the new filter can provide low insertion loss. It is found that this design has wide coupling range for dual-mode operation. It means that these characteristics of the proposed filter can reduce uncertainty in fabrication. By using two PIN diodes mounted inside a pair of spur-lines, the proposed structure works as a switchable filter. Also, it has a size reduction of about 34.7 %, compared with conventional dual-mode filters.

Improvement of the Microstrip Patch Bandpass Filter using Interdigital Couping Structure and Embeded Slot (깍지 낀 결합 구조와 슬롯을 이용한 마이크로스트립 패치 대역통과필터의 특성 개선)

  • Kim, Hyun;Lim, Hyun-Jun;Yoon, Hyun-Bo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.4
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    • pp.487-493
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    • 2001
  • In this paper, A new microstrip bandpass filter is proposed. The novelty of the proposed structures is to use a interdigital capacitor and embeded slot that are fanned on a patch resonator such that its insertion loss and size can be significantly reduced simultaneously. As a result, it is found that the resonant frequency of patch filter designed at 5 GHz is decreased to 1.8946 GHz and the insertion loss is reduced from -2.168 dB to -0.379 dB. This proposed filter has small size and low insertion loss in comparison with the conventional parallel edge coupled bandpass filter.

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Design Of Compact Passive Triplexer Module for Wi-MAX Application (수동 소자를 이용한 Wi-MAX용 트리플렉서 모듈 설계)

  • Jeon, Jae-W.;Seo, Jae-H.;Lee, Seung-C.;Lee, Sang-A.;Lim, Jong-H.;Cheon, Seong-J.;Park, Jae-Y.
    • Proceedings of the KIEE Conference
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    • pp.2253_2254
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    • 2009
  • 무선 모바일 통신 시장의 성장에 따라 수동 소자로 구성된 모듈에 대한 관심이 높아지고 있다. 본 논문에서는 수동소자를 이용한 Wi-MAX용 트리플렉서를 설계하였다. 트리플렉서는 Wi-MAX의 RF Front-end단 앞부분에 연결되며, IEEE 802.16에 따른 2GHz, 3GHz, 5GHz 대역을 선택, 분리해주는 역할을 한다. 제안된 트리플렉서는 저역통과필터, 대역통과필터, 고역통과필터로 구성하였으며, 수동소자의 최소화로 인해 삽입손실 향상을 중점으로 설계하였다. 회로해석 결과, 각 대역별 (2/3/5GHz) 삽입손실은 각각 -0.5dB, -0.6dB, -0.4dB 였으며, 반사손실은 -20dB, -20dB, -12dB, 격리도는 -20dB, -24dB, -25dB의 특성을 보였다. 수동 소자의 최소화 설계로 인해 모듈 및 시스템의 저가화를 기대할 수 있다.

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Design of an Ultra Wide Band Band-pass Filter with Open-Stubs (초광대역 개방형 스터브 대역통과 여파기의 설계)

  • Yoon, Ki-Cheol;Kang, Chul-Ho;Hong, Tae-Ui;Lee, Jong-Chul
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.12 no.6
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    • pp.37-43
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    • 2013
  • In this paper, an UWB (Ultra Wide Band) band-pass filter with open stubs using SIR (Stepped Impedance Resonator) structure is presented. The proposed band pass filter (BPF) has SIR structure instead of open stubs for UWB application with low insertion loss. The bandwidth of the proposed BPF is 103 % at the center frequency of 5.8GHz and the insertion and return losses are 0.17dB and 13.1dB, respectively. Also, the entire size of the proposed band-pass filter is $21.6{\times}17.8mm^2$.

Coplanar Waveguides Fabricated on Oxidized Porous Silicon Air-Bridge for MMIC Application (다공질 실리콘 산화막 Air-Bridge 기판 위에 제작된 MMIC용 공면 전송선)

  • 박정용;이종현
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.40 no.5
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    • pp.285-289
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    • 2003
  • This paper proposes a 10 ${\mu}{\textrm}{m}$ thick oxide air-bridge structure which can be used as a substrate for RF circuits. The structure was fabricated by anodic reaction, complex oxidation and rnicrornachining technology using TMAH etching. High quality films were obtained by combining low temperature thermal oxidation (50$0^{\circ}C$, 1 hr at $H_2O$/O$_2$) and rapid thermal oxidation (RTO) process (105$0^{\circ}C$, 2 min). This structure is mechanically stable because of thick oxide layer up to 10 ${\mu}{\textrm}{m}$ and is expected to solve the problem of high dielectric loss of silicon substrate in RF region. The properties of the transmission line formed on the oxidized porous silicon (OPS) air-bridge were investigated and compared with those of the transmission line formed on the OPS layers. The insertion loss of coplanar waveguide (CPW) on OPS air-bridge was (about 1 dB) lower than that of CPW on OPS layers. Also, the return loss of CPW on OPS air-bridge was less than about - 20 dB at measured frequency region for 2.2 mm. Therefore, this technology is very promising for extending the use of CMOS circuitry to higher RF frequencies.

A Novel Waveguide-based Ka-band Power Divider/Combiner Using Slotline-to-Microstrip Transitions (슬롯라인-마이크로스트립 변환을 이용한 도파관 형태의 Ka-band 전력 분배/결합기)

  • 정진호;천창율;권영우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.27 no.5C
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    • pp.506-511
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    • 2002
  • In this paper, waveguide-based power combiner using conventional slotline-to-microstrip transition was proposed at Ka-band. The proposed 2-way and 4-way power combiner consist of waveguide-to-slotline transition, two or four slotline-to-microstrip transitions, and impedance matching networks. Their structures were simulated and optimized by 3-D FEM simulation. The 2-way power combiner showed a very low back-to-back insertion loss of 1.0 dB and return loss better than 15 dB from 25.7 GHz to 29.8 GHz except the resonant frequency. The 2-way power combining approach was extended to 4-way power combining using slotline tee junction. The 4-way power combiner showed the similar performance to that of 2-way power combiner with 2 GHz smaller bandwidth.

A 20-way Stripline Power Divider for an S band Linear Array Antenna with Low Loss and Low Side Lobe Level (S 대역 선형 배열 안테나 급전회로를 위한 저손실, 저부엽 20-출력 스트립라인 전력분배기)

  • Kwon, Tae-Min;Kim, Dong-Wook
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.7
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    • pp.128-134
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    • 2010
  • In this paper, a high-power 20-way stripline power divider with low insertion loss and low side lobe level is successfully designed, fabricated and measured as a feed network for an S-band linear array antenna having Dolph-Chebyshev current distribution which has a narrow beam width and very low side lobe level (SLL). The 20-way stripline power divider consists of an 8-way power divider, three 4-way power dividers and three ring hybrids. It utilizes a T-junction structure as a basic element for power dividing. Notches and modified input/output N-to-stripline transitions are used for improving insertion loss and return loss. The fabricated power divider shows insertion loss less than 0.3 ㏈ and rms phase mismatch less than 8o in the full bandwidth. A final 40-way power divider is synthesized by combining symmetrically two 20-way power dividers and is expected to have SLL over 40 dB, based on the measured results of the 20-way power divider.

The Characteristics Variation of a Square Transducer as the Radiation Impedance - (정방형 트랜스듀서의 방사임피던스에 의한 특성 변화)

  • Lee Gi-Wook;Kim Moo-Joon;Ha Kang-Lyeol;Kim Chun-Duck
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.265-268
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    • 2000
  • 트랜스듀서의 삽입손실과 임펄스 응답특성 등을 정확히 해석하기 위해서는 대상 주파수 대역에 대한 특성을 알아야한다. 방사임피던스는 주파수의 함수이기 때문에 이러한 특성을 결정하는 중요한 요소이다. 따라서 본 연구에서는 정방형 방사면을 가지는 트랜스듀서 이용하여, 무한배플에서의 방사임피던스를 고려한 삽입손실을 이론적으로 계산하고 무한배플로 근사할 수 있는 모델을 제작하고, 이를 실험으로 확인한 결과 좋은 일치를 보이고 있어 본 연구에서 제안한 해석법의 타당성을 확인하였다.

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A Study of Barrier Insertion Loss Near a High Rise Building (고층 건물에 인접한 방음벽의 삽입손실에 관한 연구)

  • 진병주;김현실;김상렬
    • Journal of KSNVE
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    • v.10 no.1
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    • pp.49-56
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    • 2000
  • In this paper performance of the noise barrier which is 53 m long and 6m high, and is located between the high rise apartment and road, is studied by using experimental and analytic method. The insertion loss is measured by using the direct method in accordance with the ISO code, while theoretical prediction is based on Muradali and Fyfe's method (Applied Acoustics, Vol. 53, 49~75, 1998). In addition to the diffraction at the top of the barrier, the waves are reflected infinite times between the building and the barrier, which is equivalent to replacing the building by the infinite series of the image receiver points. In two-dimensional study, the prediction of the insertion loss results in significantly overestimated values compared with the measurement. However three-dimensional analysis shows reasonable agreements, where traffic noise is assumed as incoherent line source and the length of the source is larger than that of the barrier.

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Analysis on the Insertion Loss of a Noise Barrier by the Boundary Element Method (경계요소법을 이용한 방음벽의 삽입손실 해석)

  • 이우섭;정성수;황철호
    • Journal of KSNVE
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    • v.10 no.3
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    • pp.423-429
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    • 2000
  • This paper investigates the use of boundary element method(BEM) to analyze the insertion loss of a noise barrier. To begin with the validity of the BEm for the analysis of noise barrier insertion loss in checked by both Lam's theoretical method and the measurements in the anechoic chamber for the scale-down models. Through simulation it is shown that using 2D BEM model is sufficient to the analysis for the barrier with large ratio of length to height. By using 2D BEM model the insertion loses are predicted for the real noise barriers in several cases which are the case that they are built parallel on both roadsides the one that there are multiple sound sources and the one that there is a gap between a concrete structure and a barrier plate.

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