• Journal of the Microelectronics and Packaging Society
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• v.6 no.3
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• pp.19-24
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• 1999

The multilayer chip band pass filter for mobile communication is fabricated and designed. The size, insertion loss, center frequency and band width of multilayer chip filter are 4.5$\times$4.4$\times$1.8[mm], 3.0[dB] and 700[MHz]$\pm$15[MHz] respectively. The chip filter using $BiNbO_4$with CuO 0.06wt% +$V_2O_5$.lwt% was fabricated by screen printing with Ag electrode after tape casting. Insertion loss and center frequency of the fabricated chip filter are 2.58[dB] and 692.5$\pm$15[MHz] respectively. The center frequency was lower 7.5[MHz] than design result, but other characteristics of chip filter were similar to the ruts ultras of design result.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.3
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• pp.627-633
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• 2000

In this paper, the polyphase filter which has micro ripple characteristic in the passband is proposed. This filter consists of the digital all-pass filter of parallel structure and it is the half-band filter with all zeros in unit circle. To approach easily in designing hardware, we determined the coefficients to the 16bit 1.15 format. To evaluate the performance of this filter, we analyzed the phase characteristic in each branch and each filter with small coefficients. Also, we simulated the phase characteristic of passband and stopband, group delay. As the result, we obtained the micro ripple characteristic and linear phase in the passband.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.1273-1278
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• 2005

In this thesis, a 2 stage 6-pole bandpass filter(BPF) is designed and implemented by using triple-mode cavity for satellite payload system. The BPF has a 100MHz bandwidth at the center frequency of 14.5GHz(Ku-band) and the response of the filter is the Chebyshev function. The cavity filter uses two orthogonal $TE_{113}$ modes and one $TM_{012}$ mode. The coupling between the adjacent cavityes(intercavity coupling) results in a Chebyshev response and is accomplished by only H-filed component of TE modes. The size and location of intercavity slot is determined by the coupling equation from E- and H-field of TE and TM resonant modes in circular cavity. The 2-stage 6-pole triple-mode cavity BPF has the insertion loss of 2.4dB and the reflection loss of 15dB in the passband. The triple-mode BPF proposed in this thesis can be used as channel filters for satellite payload system and can minimize filter assembly in general wireless communication system.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.1
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• pp.7-11
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• 2002

A novel microstrip type law-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.

• Journal of the Microelectronics and Packaging Society
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• v.10 no.1
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• pp.19-24
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• 2003

A very small size 2.4 GHz ISM band BPF(Band Pass Filter) is realized using LTCC Multi-layer technology. Proposed design method enables to achieve BPF size $2.0\times1.2\times0.8mm^3$. A $lambda/4$ resonator with shunt-to-ground loaded capacitor is used to shorten resonator length, achieving higher quality factor. Also this resonator enables BPF to improve out-of-band rejection. Coupling coefficients between coupled strip-line resonators and external quality factor (Qe) of a resonator are derived and applied to the filter design. The measured results show good agreement with simulated data.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2002.11a
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• pp.91-95
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• 2002

A very small size BPF is realized using LTCC Multilayer technology. A λ/4 resonator with shunt-to-ground loaded capacitor is used to shorten resonator length and achieve higher qualityfactor. Also this resonator enable BPF to improve out-of-band rejection. Coupling coefficients between coupled stripline resonators and external qualityfactor of a resonator are derived and apply to the filter design. The measured results show a good agreement with the simulation.

• Journal of Korea Multimedia Society
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• v.7 no.11
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• pp.1515-1520
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• 2004

In this paper, a new continuous-time bandpass active filter for lour-voltage applications is proposed. The active filter is composed of the CMOS complementary cascode circuit which can increase trans-conductance of an active element. These results are verified through the 0.25$\mu\textrm{m}$ CMOS n-well parameter hspice simulation. As a result, the gain and the unity gain frequency is 42dB and 200MHz respectively in the integrator. Additionally, center frequency of the bandpass active filter is 747kHz. And also bandwidth of the filter is 649kHz on 2V supply voltage.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.3
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• pp.1734-1739
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• 2014

In this paper, microstrip low pass filter using transmission line with the modified DCRLH structure is designed and fabricated to be removed a spurious resonant mode, and a deep attenuation in stop band. The low pass filter is composed of shunt open-stub to get a deep attenuation and series short-stub to eliminate the spurious harmonics in stop band. In this way, the spurious harmonics occurring on the higher order frequency are suppressed and the filter performance is improved. Insertion loss and VSWR of the fabricated microstrip low pass filter in the passband from DC to 1.5 GHz is 1.26 dB and 1.65, and attenuation on the stopband from 1.84 GHz to 2.18 GHz is less than -100 dB. And also this filter has a good performance for 20 watt power test.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.9
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• pp.924-930
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• 2003

In this paper, a novel miniaturized microstrip duplexer with attenuation pole is proposed. A three-pole microstrip CT(Cascade Trisection) two bandpass filters have each asymmetrically prescribed transmission zero are design and fabrication. This CT bandpass filter changes coupling structure, which not only shifts the location of attenuation poles but also improves skirt characteristics. The duplexer results of measurement with the cross coupling CT bandpass filters has been yielded better isolation and sharper skirt behavior than that with a conventional bandpass filter. The results of measurement are almost similar to those of simulation results.

• Electrical & Electronic Materials
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• v.2 no.1
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• pp.41-51
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• 1989

압전세라믹을 이용한 에너지포획형 단일체 대역통과필터는 '에너지포획'과 '탄생결합'이라는 두 중요한 원리를 사용한다. 본 연구의 주된 목적은 이중결합필터의 전극변수가 필터 특성에 미치는 영향을 규명하는 것이다. 예비단계로 에너지포획형 공진자의 부분전극의 단위 면적당 무게나 부분전극의 크기가 주파수특성에 미치는 영향을 조사하여 에너지포획을 야기시킬 수 있는 부분전극의 조건을 설정하였다.