• Title, Summary, Keyword: BPF

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A Comparison of the Cascading Chebyshev BPF's skirt Characteristic and the Same Order BPF's (종속 Chebyshev BPF와 동일 차수 BPF의 skirt 특성 비교)

  • Shin, Seung-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.4
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    • pp.598-604
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    • 2015
  • A Chebyshev filter is well known for having a sharp skirt characteristic and equi-ripple. On the other hand, a Butterworth filter has a smooth skirt characteristic and maximally flat ripple. This paper analyzes the skirt characteristics of the filters with the cascade connection. The paper deals with the Chebyshev BPF, Cascading Chebyshev BPF, Butterworth BPF, Cascading Butterworth*Chebyshev BPF. First of all, the paper designs the prototype analog LPF in order to analyze skirt characteristics of the BPFs. Then the paper does the frequency transformation into the BPFs and tests the BPFs with cascading them. As a result, the skirt characteristics of the Chebyshev BPF was the sharpest and those of the Cascading Chebyshev BPF, Butterworth BPF, Cascading Butterworth*Chebyshev BPF was superior in order. The validity of the paper was confirmed through minute measurements of test results.

The Design of Balun-BPF with Double Ring-Resonators (두 개의 링-공진기로 구성된 Balun-BPF의 설계)

  • Kang, Seong-Jun;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.8
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    • pp.878-883
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    • 2008
  • In this paper, we propose a double rings structure to improve the balanced-port characteristics of Balun-Bandpass Filter(Balun-BPF). The conventional Balun-BPF has limitations on output symmetry and skirt steepness. We introduce a double rings structure and the suitable coupling point between the two ring resonators to solve these problems. The fabricated double rings Balun-BPF shows excellent characteristics as a Balun-BPF without the conventional limitations.

An Analysis of Three Port Ring Resonator for the Balun-BPF Characteristics (Balun-BPF 특성 구현을 위한 3-단자 링-공진기의 해석)

  • Kang, Seong-Jun;Park, Ung-Hee;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.4
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    • pp.436-441
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    • 2008
  • In this paper, we derived the Y-parameter of the recently reported Balun-BPF with a dual mode ring resonator by using the network analysis method. Using the derived Y-parameter we verified that the Balun-BPF structure satisfy the balun conditions. In order to design the Balun-BPF with arbitrary characteristics using the standard BPF design method with ease we derived the immittance slope parameters of the dual mode ring resonator with a load. The notch frequencies are also predicted. By designing with the proposed equations, simulating with a circuit simulator, fabricated and measured a Balun-BPF we confirmed the validation of the equations. The measured data shows bandwidth of 71 MHz and insertion loss of 0.92 dB at the center frequency of 2.46 GHz. It shows the phase imbalance of $174{\sim}181$ degree and the magnitude imbalance within 0.5 dB.

Miniaturization of Dual Ring Balun-BPF (두 개의 링-공진기를 갖는 Balun-BPF의 소형화)

  • Kang, Seong-Jun;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.2
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    • pp.129-134
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    • 2009
  • In this paper, we proposed a miniaturized Balun-BPF structure using semi-lumped line The conventional Ring Balun-BPF relatively has a big size structure because they consist of two ring resonators, wide line width ring-resonators for low loss and $\lambda/4$transmission line inverters. The ring resonators are miniaturized to 1/4 size by semi-lumped line and we added triangle patches in the ring resonator for compact Balun-BPF structure. The fabricated Balun-BPF is miniaturized to 1/4 size and contains symmetrical output characteristics of balance ports.

Trade-offs Between the Ripple and the Transition Band for the Chebyshev BPF and the Cascading Chebyshev BPF (Chebyshev BPF와 종속 Chebyshev BPF의 리플-천이대역 Trade-offs)

  • Shin, Seung-Sik;You, Chi-hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.2
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    • pp.255-260
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    • 2018
  • This study is focusing on the trade-offs between the passband ripples and transition bands of the Chebyshev BPF, which is converted by using the Chebyshev LPF that is well known as a proto-type analog filter. It is also focusing on the trade-offs between the passband ripples and transition bands of the cascading Chebyshev BPF, as well as, the trade-offs between the two BPFs. The study finds the frequency responses of the proto-type analog LPF, the Chebyshev BPF and the cascading Chebyshev BPF. The study shows the results as comparative analysis tables. The study designs the 10th Chebyshev BPF in order to analyze it easily. The simulation results show that the Chebyshev BPF decreases about 55% of the transition band for the -2.5[dB] passband ripple comparing to the -0.5[dB] passband ripple. This study shows the effectiveness and economic feasibility in the restricted frequency communication environment for the decrease of the transition band as providing the passband ripple margin.

A Design of LTCC Balun-BPF for 2.45GHz Band (2.45GHz 대역 LTCC Balun-BPF의 설계)

  • Jung, Eul-Young;Choi, Kyoung;Hwang, Hee-Yong
    • Journal of Industrial Technology
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    • v.25 no.B
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    • pp.175-182
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    • 2005
  • This paper presents a LTCC Balun-BPF, which is a BPF(band pass filter) with a Balun in a single LTCC chip for the direct interface with a MMIC chip having balanced inputs. The physical dimension of the designed Balun-BPF is $2.4{\times}2.0{\times}0.88mm^3$ and the used dielectric constant ${\varepsilon}_r$ is 36. A Balun of three-lines structure with striplines and a BPF of comb-line structure was combined into the Balun-BPF. The simulated result shows 4.8㏈ of insertion loss, 178~179 degree of the phase imbalance, 14㏈ of the return.

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Design and Fabrication of a BPF for 5.8 GHz Microwave Wireless Power Transmission (5.8 GHz 마이크로파 무선전력전송을 위한 BPF의 설계 및 구현)

  • Lee, Seong Hun;Son, Myung Sik
    • Journal of the Semiconductor & Display Technology
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    • v.14 no.4
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    • pp.88-91
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    • 2015
  • In this paper, we have designed and fabricated a BPF (Band Pass Filter) for 5.8GHz Microwave Wireless Power Transmission. We $used{\lambda}g/2$ open-circuited stubs in addition to T-shaped transmission lines for the BPF. This BPF removes harmonics caused by diodes of RF-DC converter, and thus the RF-DC converter converts more RF power to the DC. The performance of the BPF was measured and shown through direct comparison of voltages converted by the doubler as a RF-DC Converter with and without the BPF.

A Microstrip Dual-Band Band-Pass Filter Using Feed Lines and Resonators with SIR Structures (SIR 구조의 피드 라인과 공진기를 이용한 마이크로스트립 이중대역 대역통과 여파기)

  • Lim, Ji-Eun;Lee, Jae-Hyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.5
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    • pp.463-470
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    • 2015
  • In this paper, a new dual-band bandpass filter(BPF) that has resonators and feed lines with Stepped-Impedance Resonator(SIR) structures is proposed. Feed lines with SIR structure provide maximum magnetic field points which occur at the same locations of the input and output feed lines, so the insertion loss of BPF was reduced. Applying the SIR structure to the BPF for the first passband improves rejection characteristics between the first passband and the second passband. It reduces the coupling between the BPF for the first passband and the BPF for the second passband, so it makes the dual-band BPF more compact. The proposed design method provides independent changes of both the center frequency and the bandwidth for each resonator, and also improves filtering characteristics. The validity of the proposed design method is confirmed by comparisons between the designed parameters and the measured results satisfying WLAN specifications.

A Slotted Square-Patch Type Balun-BPF (슬롯을 가진 사각 패치형의 발룬-대역 통과 여파기)

  • Oh, Song-Yi;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.11
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    • pp.1208-1213
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    • 2010
  • In this paper, a microstrip balun-BPF of slotted-square-patch type is proposed. The conventional balun-BPF has some drawbacks of narrow bandwidth and high insertion loss. In order to improve these weak points, we used a square patch in designing balun-BPF on which two slots intersecting perpendicularly and one corner-edge perturbation are adopted. This structure allows one of the most effective use of the patch space so that the insertion loss can be decreased. Changing the slot lengths is use to control the operating frequency and the bandwidth of the balun-BPF. A fabricated balun-BPF shows wide bandwidth of 300 MHz(12.7 %), small insertion loss of 0.56 dB, phase difference of $184^{\circ}{\pm}15^{\circ}$ and amplitude imbalances of within 1 dB between two output ports at 2.4 GHz band.

Closure of Post Left Pneumonectomy Bronchopleural Fistula with Empyema Thoracis [Transsternal Transpericardial Approach] - One Case Report - (좌측 전폐절제 수술후 발생한 기관지 늑막루의 폐쇄치료 1례)

  • Mun, Dong-Seok;Lee, Du-Yeon;Kim, Hae-Gyun
    • Journal of Chest Surgery
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    • v.25 no.6
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    • pp.593-597
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    • 1992
  • The bronchopleural fistula[BPF] due to bronchial stump disruption after pneumonec-tomy has remained one of the most dreadful complications to now. The management of the BPF with empyema thoracis are still therapeutic dilemma even though a various surgical methods for the control of BPF with or without empyema thoracis. We have experienced the successful treatment of BPF & empyema thoracis with transsternal transpericardial approach. The patient was a 54 years old male who was taken left pneumonectomy at W. Medical Center at sept, 19th. 1991. He was suffered from the BPF R empyema thoracis and so was transferred to our hospital at Nov. 19th. 1991. We treated the patient with transsternal transpericardial bronchial closure for BPF, and put clagett procedure for empyema thoracis in 2 weeks. We think this kind of surgical techniques is one of the relatively simple and effective method for the control of BPF and empyema thoracis.

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