• Title/Summary/Keyword: radio frequency resonator

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Noise analysis and simulation of the audio circuits (Audio 회로의 잡음해석과 시뮬레이숀)

  • 차균현;이근철
    • 전기의세계
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    • v.29 no.12
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    • pp.798-803
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    • 1980
  • A computer program for noise analysis of the audio circuit is developed. The application of the program to the equalizer, low frequency amplifier of radio circuit and cascaded amplifier show good results. The general noise analysis method for cascade operational amplifier is presented. The noise spectral power density is calculated for a resonator active filter.

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Design of an SIR BPF by a Novel EM Tuning of Individual Resonators (개별 공진기의 EM 조정을 통한 SIR로 구성된 대역 여파기의 설계)

  • Yang, Seong-Sik;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.7
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    • pp.748-756
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    • 2007
  • In SIR filter, fringing capacitances and discontinuities yield a distorted frequency response from those expected by design formulas, especially in higher frequencies. In this paper, a procedure is presented in order to compensate for fringing capacitances and step impedance discontinuities by EM simulation for a 5th order SIR filter. This method propose the procedure of tuning the coupling and the length of individual resonator by EM simulation. For the filter composed by the tuned resonators, no further tuning is required. The procedure is experimentally justified by comparing the measured data of the fabricated filter with the simulation results.

A Study of Developing Band Pass Filter for Radio Astronomy Equipments (전파천문 기기용 BPF의 개발에 관한 연구)

  • Lee Je-Hun;Kim Dong-Il;Che Seung-Hun;Song Young-Man
    • Journal of Navigation and Port Research
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    • v.30 no.5 s.111
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    • pp.363-367
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    • 2006
  • The frequency band $10.5GHz\sim10.7GHz$ provides some of the best angular resolutions using many large and accurate radio telescopes. Developing high performance Bandpass Filter is needed for these equipments to receive low power signals from the space. In this paper, suggests Bandpass Filter for Radio Astronomy equipments. Designed by Microstrip Line for good pass characteristic and suppressing not necessary signals cause of using high frequency. Center frequency is 10.6 GHz and band width is 5% of Center frequency. Manufactured Bandpass Filter is suitable for Radio Astronomy Equipments. Bemuse it matches up to the result by simulate.

Synthesis of Bulk Medium with Negative Permeability Using Ring Resonators

  • Kim, Gunyoung;Lee, Bomson
    • Journal of electromagnetic engineering and science
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    • v.16 no.2
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    • pp.67-73
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    • 2016
  • This paper presents simple expressions for the effective permeability of bulk metamaterial consisting of ring resonators (RRs) or split ring resonators (SRRs) based on the convenient geometrical factors of the structure compared with wavelength. The resonant frequency dependence of the medium permeability, including loss effects, is analyzed in detail. Inverting the analysis equations, useful design (or synthesis) equations are derived for a systematic design process with some examples. This paper may particularly be useful for the design of a bulk metamaterial with a specific negative relative permeability at a desired frequency. The loss of metamaterials consisting of RRs (or SRRs) is also analyzed over a wide frequency band from 10 MHz to 10 THz.

AN ANALYSIS OF EMBEDDING IMPEDANCE FOR Q-BAND WAVEGUIDE GUNN OSCILLATOR WITH RESONANCE POST (공진 포스트 구조를 갖는 Q-band 도파관형 건 발진기의 임베딩 임피던스 해석)

  • 김현주;한석태;김태성;김광동;이창훈;정문희;김용기
    • Journal of Astronomy and Space Sciences
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    • v.18 no.2
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    • pp.119-128
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    • 2001
  • The oscillation frequency tuning range of waveguide Gunn oscillator and its stability depend sensitively on the dimensions of the resonator. Therefore the embedding impedances with the various dimensions of the resonator for Q-band (33 ∼ 50 GHz) Gunn oscillator are calculated by using HFSS (High Frequency Structure Simulator). In this paper the comparisons between theoretical results of embedding impedances as a function of frequency and that of experimental results are described. And the oscillation frequency range could be predicted by using the theoretical evaluation methods which were proposed in this paper It shows that post size has an effect on the frequency tuning characteristics of Gunn oscillator.

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Frequency Adaptive High Efficiency Class-E Amplifier in RFID System (RFID 시스템에 사용되는 주파수 적응형 고효율 Class-E 증폭기)

  • Kwan, Sang-Gun;Son, Gang-Ho;Kim, Young;Yoon, Young-Chul
    • Journal of Advanced Navigation Technology
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    • v.14 no.3
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    • pp.351-357
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    • 2010
  • This paper proposes the adaptive class-E power amplifier with maintaining high power added efficiency (PAE) to apply RFID and wireless communication system. This switch mode amplifier is used a microprocessor to control a resonator circuits and to maintain high efficiency in case of input frequency variation. To validate the adaptive amplifier operation, which is a 450MHz operating frequency and a 100MHz bandwidth, the class E amplifier is implemented. As a result, the adaptive amplifier is maintained above 60% efficiency in frequency range and has a 74.8% maximum efficiency.

A Study of Developing Band Pass Filter for Radio Astronomy Equipments (전파천문학 기기용 BPF의 개발에 관한 연구)

  • Lee Je-Hun;Kim Dong-Il;Che Seung-Hun;Song Young-Man
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2006.06b
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    • pp.121-125
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    • 2006
  • The frequency band $10.5GHz{\sim}10.7GHz$ provides some of the best angular resolutions that using many large and accurate radio telescopes. Developing high-performanced Bandpass Filter is needed for these equipments receive low power signals from the space. In this paper, Bandpass Filter for Radio Astronomy equipments is proposed. It is designed by Microstrip Line for good pass characteristic and suppressing unwanted signals. Center frequency is 10.6 GHz and band width is 5% of Center frequency. Manufactured Bandpass Filter is suitable for Radio Astronomy Equipments. Because the measured results agree well with the simulation results.

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Design of Phase Locking Loopfilter Using Sampling Phase Detector for Ku-Band Dielectric Resonator Oscillator (Ku-대역 유전체 공진기 발진기의 Sampling Phase Detector를 이용한 위상 고정 루프 필터 설계 및 제작)

  • Badamgarav, O.;Yang, Seong-Sik;Oh, Hyun-Seok;Lee, Man-Hee;Jeong, Hae-Chang;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.10
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    • pp.1147-1158
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    • 2008
  • In this paper, we designed a phase-looking circuit that locks the 16.8 GHz VTDRO to a 700 MHz SAW oscillator using SPD as a phase detector Direct phase locking with loop filter alone causes the problem of lock time, so VTDRO is phase leered by loop filter with the aid of time varying square wave current generator. The current generator is related to the loop filter and needs the systematic toning. In this paper, a systematic design of the current generator and loop filter is presented. The fabricated PLDRO shows a stabilized frequency of 16.8 GHz, a output power 6.3 dBm, and a phase noise of -101 dBc/Hz at the 100 kHz offset.

An ultra low-noise radio frequency amplifier based on a dc SQUID

  • Andre, Marc-Olivier;Kinion, Darin;Clarke, John;Muck, Michael
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.2-6
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    • 2000
  • We have developed an extremely sensitive radio frequency amplifier based on the dc superconducting quantum interference device (dc SQUID). Unlike a conventional semiconductor amplifier, a SQUID can be cooled to ultra-low temperatures (100 mK or less) and thus potentially achieve a much lower noise temperature. In a conventional SQUID amplifier, where the integrated input coil is operated as a lumped element, parasitic capacitance between the coil and the SQUID washer limits the frequency up to which a substantial gain can be achieved to a few hundred MHz. This problem can be circumvented by operating the input coil of the SQUID as a microstrip resonator: instead of connecting the input signal open. Such amplifiers have gains of 15 dB or more at frequencies up to 3 GHz. If required, the resonant frequency of the microstrip can be tuned by means of a varactor diode connected across the otherwise open end of the resonator. The noise temperature of microstrip SQUID amplifiers was measured to be between $0.5\;K\;{\pm}\;0.3\;K$ at a frequency of 80 MHz and $1.5\;K\;{\pm}\;1.2\;K$ at 1.7 GHz, when the SQUID was cooled to 4.2 K. An even lower noise temperature can be achieved by cooling the SQUID to about 0.4 K. In this case, a noise temperature of $100\;mK\;{\pm}\;20\;mK$ was achieved at 90 MHz, and of about $120\;{\pm}\;100\;mK$ at 440 MHz.

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An Ultra Low-noise Radio Frequency Amplifier Based on a DC SQUID

  • Muck, Michael;Ande, Marc-Olivier;Kinion, Darin;Clarke, John
    • Progress in Superconductivity
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    • v.2 no.1
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    • pp.1-5
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    • 2000
  • We have developed an extremely sensitive radio frequency amplifier based on the dc superconducting quantum interference device (dc SQUID). Unlike a conventional semiconductor amplifier, a SQUID can be cooled to ultra-low temperatures (100 mK or less) and thus potentially achieve a much lower noise temperature. In a conventional SQUID amplifier, where the integrated input coil is operated as a lumped element, parasitic capacitance between the coil and the SQUID washer limits the frequency up to which a substantial gain can be achieved to a few hundred MHz. This problem can be circumvented. by operating the input coil of the SQUID as a microstrip resonator: instead of connecting the input signal between the two ends of the coil, it is connected between the SQUID washer and one end of the coil; the other end is left open. Such amplifiers have gains of 15 dB or more at frequencies up to 3 GHz. If required, the resonant frequency of the microstrip can be tuned by means of a varactor diode connected across the otherwise open end of the resonator. The noise temperature of microstrip SQUID amplifiers was measured to be between 0.5 K $\pm$ 0.3 K at a frequency of 80 MHz and 1.5 K $\pm$: 1.2 K at 1.7 GHz, when the SQUID was cooled to 4.2 K. An even lower noise temperature can be achieved by cooling the SQUID to about 0.4 K. In this case, a noise temperature of 100 mK $\pm$ 20 mK was achieved at 90 MHz, and of about 120 $\pm$ 100 mK at 440 MHz.

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