• 한국항해항만학회지
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• 제30권7호
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• pp.607-610
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• 2006

A new compact microstrip low-pass filter and its equivalent-circuit model are developed. The philosophy of the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth of this type of low-pass filter can be extended. In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured. Experimental results agree very well with the simulation and analytical results.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 Asia Navigation Conference
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• pp.79-84
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• 2006

A novel design of compact low-pass filter based on microstrip structure and its equivalent-circuit model are developed. The philosophy of the structure behind this novel microstrip low-pass filter is simple as it is composed of a pair of symmetrical parallel coupled-line and an open-stub. With this configuration, a finite attenuation pole near the stopband cutoff frequency is available and adjustable by simply tuning the circuit parameters. Furthermore, the rejection bandwidth of this type of low-pass filter can be extended. In order to validate the feasibility of the proposed design method, a low-pass filter based on a microstrip structure is designed, fabricated, and measured. Experimental results agree very well with the simulation and analytical results.

• International Journal of Computer Science & Network Security
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• 제24권7호
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• pp.118-122
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• 2024

The dielectric material is a basic element which impacts considerably on a microstrip structure performances. This project demonstrates how filter performances such as gain, bandwidth, return loss and insertion loss change proportionally with substrate material variation. The RT/Duroid 5880 and the FR-4 are two dielectric materials proposed as substrates of a low pass microstrip filter. The design and simulation are done on ADS software. The transmission and reflection characteristics show that the RT/ Duroid 5880 as a dielectric substrate permits to obtain better performance as compared to the FR-4 substrate.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2001년도 종합학술발표회 논문집 Vol.11 No.1
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• pp.172-175
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• 2001

A novel microstrip type low-pass filter using thin or thick film resistors is proposed to efficiently eliminate harmonic spurious response in stop-band. The proposed low-pass filter shows the spurious suppression enhancement of 20 dB over a conventional one. The designed low-pass filter could be used as a harmonic rejection filter of a local oscillator for Ku-band satellite payload system.

• ETRI Journal
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• 제37권5호
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• pp.945-950
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• 2015

A novel microstrip low-pass filter is presented to achieve an ultra-wide stopband with 11 harmonic suppression and very sharp skirt characteristics. The filter is composed of a modified U-shaped resonator (which creates two fully adjustable transmission zeroes), a T-shaped resonator (which determines a cut-off frequency), and four radial stubs (which provide a wider stopband). The operating mechanism of the filter is investigated based on a proposed equivalent-circuit model, and the role of each section of the proposed filter in creating null points is theoretically discussed in detail. The presented filter with 3 dB cut-off frequency ($f_c=2.35GHz$) has been fabricated and measured. Results show that a relative stopband bandwidth of 164% (referred to as a 22 dB suppression) is obtained while achieving a high figure-of-merit of 15,221.

• 한국산학기술학회논문지
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• 제10권6호
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• pp.1180-1185
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• 2009

본 논문에서는 T-접합선로의 집중소자 등가회로를 고려한 저역통과 여파기를 제안하였다. 일반적인 저역통과 여파기 설계 시 발생하는 T-접합선로의 특성에 따른 주파수 변이 특성을 해결하기 위해 T-접합선로 등가회로의 소자 값을 구하는 수식을 유도 하였다. 또한, 전자장 시뮬레이터(HFSS)를 이용하여 T-접합선로를 디임베딩하였다. 이로써 선로의 임피던스 허수값들이 일치되게 하여 T-접합선로 등가회로에서 집중소자의 정확한 값을 구하였다. 그리고 이 값들을 이용하여 저역통과 여파기를 설계한 결과, 집중소자 여파기의 주파수 특성과 분포소자 여파기의 주파수 특성이 매우 잘 일치함을 확인할 수 있었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.136-136
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• 2009

It is investigated the cut-off frequency of Z-cut quartz microstrip low pass filter by the variation of applied electric field. Designed microstrip filter was simulated using the Ensemble v7.0(Ansoft). As a result of the experiment, the cut-off frequency showed 50 MHz shift when the applied electric field was 3 kV/cm.

• 한국전자파학회논문지
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• 제13권1호
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• pp.7-11
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• 2002

본 논문에서는 저지대역에서 하모닉과 불요특성을 효과적으로 제거하기 위한 목적으로 박막 혹은 후박 저항을 이용한 새로운 형태의 마이크로스트립 형태의 저역통과 필터를 제안한다. 제안한 필터는 기존의 마이크로스트림형태의 저역통과 필터에 비해 20dB 이상의 불요파 제거 효과를 보인다. 설계된 저역통과 필터는 Ku 대역 위성중계기용 국부발진기의 하모닉 제거 필터로 사용되어질 수 있다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2003년도 하계학술대회
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• pp.293-295
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• 2003

In this paper, planar harmonic rejection low-pass filter is proposed to effectively suppress spurious response in stop-band. For suppress the unwanted signal such as spurious and harmonics, we presented a new design method controlled the higher order modes. The proposed low-pass filter was shown to suppress the spurious response by more than $20{\sim}40dB$ compared with conventional microstrip low-pass filters. The filter is evaluated by experiment and simulation with good agreement and shown to have attractive properties such as wide stop band range and low insertion loss.

• Journal of electromagnetic engineering and science
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• 제6권3호
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• pp.171-175
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• 2006

In this paper, a new semi-lumped low-pass filter with three finite attenuation poles at stopband is presented. The new structure is composed of a pair of symmetrical parallel coupled-line and a shunted capacitor. With this configuration, three finite attenuation poles can be available for 2nd, 3rd, and 4th harmonics suppression. The research method is based on transmission-line model for tuning the attenuation poles. In order to examine the feasibility of the proposed structure, a low-pass filter based on microstrip structure with harmonics suppression is designed, fabricated, and measured. The experimental results of the fabricated circuit agree well with the simulation and analytical ones.