• 한국광학회:학술대회논문집
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• 한국광학회 1990년도 제5회 파동 및 레이저 학술발표회 5th Conference on Waves and lasers 논문집 - 한국광학회
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• pp.248-251
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• 1990

A new CAD program for double E-plane bandpass filters is developed based on the variational analysis method and the passband correction method combined with the synthesis procedures. By taking the widths of three narrow waveguide equally, we can design bandpass filters with best stopband characteristics.

• 전자공학회논문지D
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• 제34D권9호
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• pp.15-20
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• 1997

Waveguide bandpass filters using E-plane or H-plane discontinuities have been used in many satellite communication systems. Since the transmitter and receiver of such systems tend to be getting smaller, components such as bandpass filters must also be reduced in size. In this paper, in order to reduce the waveguide, itself, of which bandpass filters consist, double plane step waveguide discontinuities are considered. They are analyzed using the mode matching method and the genralized scattering parameter of the cascaded structure is calculated. The characteristics of the bandpass filter which is designed using the reduced size waveguide is optimized by OSA90$^{TM}$. The bandpass filter has a good characteristics and smaller size than those made of the E-plane or H-plane step discontinuities.s.

• Journal of electromagnetic engineering and science
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• 제1권2호
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• pp.156-160
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• 2001

Very convenient equivalent circuits fur the design of bandpass filters with an attenuation pole in the lower or upper stopband are provided together with necessary closed-form solutions. The proposed approach gives us much flexibility and simplifies the design of inserting attenuation poles.

• JSTS:Journal of Semiconductor Technology and Science
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• 제11권1호
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• pp.65-72
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• 2011

In this paper, the T-shape stepped impedance resonators are adopted for the design of microstrip bandpass filters for wide harmonics suppression. The proposed filters are operated at the center frequency of 2.44 GHz and 5.20 GHz, respectively. These bandpass filters have been also applied for a high performance diplexer. The insertion losses at the center frequencies of 2.44 and 5.20 GHz are 1.23 and 1.18, respectively. The applicable return losses for both frequency bands and a wide stopband better than 17 dB up to 20 GHz have been obtained.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.265-268
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• 2003

In this paper, we introduce the SIR typed bandpass filters in CPW structures for shifting spurious harmonic frequency into higher frequency band. And we proposed the effective feed structures for suppressing spurious frequency in the SIR typed CPW bandpass filters. The designed folded feed structures have lowpass filtering characteristic. They are very effective feed types in the CPW bandpass filters for suppressing harmonics. The measured results of the CPW bandpass filter with folded feed line shows that it has suppressed and wide out-of-band up to 5.8fo.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.86-89
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• 2002

A new design approach for realising low-power low-voltage high-Q high-order RE bandpass filter is proposed. Based on the gyrator-C inductor topology, a 2$\^$nd/-order biquadratic bandpass filter can be realised by adding a series capacitor to the input port of the gyrator. High-Q 2$\^$nd/-order and 4$\^$th/-order fully differential RF bandpass filters operating in the 2.4-㎓ ISM (Industrial, scientific and medical) frequency band under a 2-V single power supply voltage with low power dissipation are reported.

• Journal of information and communication convergence engineering
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• 제9권2호
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• pp.150-154
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• 2011

In this paper a four-pole elliptic function bandpass filter is designed with two ground slots. A research of microstrip bandpass filters (BPF) using defected ground structures (DGS) is presented. DGS technique allows designs of tight couplings without the necessity of using very narrow coupling gaps. The simulator Sonnet is used to design the resonator and to calculate the coupling coefficient of the basic coupling structure. Compared to similar microstrip filters without defected ground structure, the simulated performances of these novel structures indicate some technological advantages.

• 한국전자파학회논문지
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• 제10권5호
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• pp.672-679
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• 1999

능동 여파기는 고집적화를 통한 소형화 추세에 있는 고주파 회로 block에 있어서 가장 핵심적인 부분중의 하나로 많은 연구가 진행되고 있으며 다수의 논문들이 발표되어 왔다. 본 논문에서는 공진기와 공진기를 연 결하고 있는 인버터를 능동소자로 대체하여 여파기를 설계하는 방법을 제시하였다. 기존의 논문에서도 본 방 법으로 연구된 사례가 있지만, 능동소자 및 능동회로로 구성된 인버터의 성능을 이론적으로 분석하지 않고 증폭기 block으로 사용하였기 때문에 여파기 성능에 미치는 영향을 고려하지 않았다. 본 논문에서는 능동소자가 갖는 특성을 해석하여 기존의 고주파 여파기 회로 설계방식에 그대로 이용할 수 있는 방법을 제시하였다. 설계된 3단 능동 여파기의 특성은 중심 주파수 865 MHz, 대역폭 75 MHz, 삽입 이득 24 MHz, 잡음지수는 2.5 d dB이하를 보였다.

• 한국전자파학회논문지
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• 제16권1호
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• pp.78-83
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• 2005

본 논문에서는 적층 Inter-digital 공진기를 이용한 LTCC 대역통과 여파기의 등가회로를 제안하고, 2.4 GHz 대역의 여파기 설계에 적용하였다. 본 논문의 LTCC 적층 칩 대역통과 여파기는 평면상에서는 Comb-line 구조이고 단면상에서는 Inter-digital 구조로 구성된다. Comb-line 구조와 Inter-digital 구조의 평행 결합선로의 등가회로를 본 논문의 여파기에 적용하여 여파기 전체의 등가회로를 구성하였다. 이 등가회로는 공진기 사이의 결합 구조가 다중의 결합 구조를 갖는다. 이를 하나의 결합 구조로 통합하여 인버터를 이용한 대역통과 여파기의 설계방법을 적용하였다. 2.4 GHz 대역에서 3단의 대역통과 여파기를 설계, 제작하였다.

• 전기학회논문지
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• 제60권12호
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• pp.2299-2304
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• 2011

In this paper, we propose the methodology to make the bandpass filters for the Smart Grid IED(Intelligent Electronic Device) smaller than the conventional bandpass filters. The size-reduction of the filters and the filter performances are indebted to devising small CRLH(composite right- and left-handed) resonators and coupling them as the metamaterial structures. The design methodology is validated by the equivalent circuit to be compared with the reliable full-wave EM simulation, and the proposed metamaterial filter outperforms the standard parallel-edge coupled filter with respect to the miniaturization and frequency response.