• Title/Summary/Keyword: 능동전력필터

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A Study on Implementation and Performance Evaluation of Wideband Receiver for the INMARSAT-B Satellite Communications System (INMARSAT-B형 위성통신용 광대역 수신단 구현 및 성능평가에 관한 연구)

  • 전중성;임종근;김동일;김기문
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.1
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    • pp.166-172
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    • 2001
  • A RF wideband receiver for INMARSAT-B satellite communications system was composed of low noise amplifier and high gain amplifier, The low noise amplifier used to the resistive decoupling circuit for input impedance matching and self-bias circuits for low noise. The high gain amplifier consists of matched amplifier type to improve receiver gain. The active bias circuit can be used to provide temperature stability without requiring the large voltage drop or relatively high-dissipated power needed with a bias stabilization resistor. The bandpass filter was used to reduce a spurious level. As a result, the characteristics of the receiver implemented here show more than 60 dB in gain and less than 1.8:1 in input and output voltage standing wave ratio(VSWR), especially the carrier to noise ratio which is input signal level -126.7 dB m at 1537.5 MHz is a 45.23 dB /Hz at a 1.02 kHz.

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A Study on Fabrication and Performance Evaluation of Wideband Receiver using Bias Stabilized Resistor for the Satellite Mobile Communications System (바이어스 안정화 저항을 이용한 이동위성 통신용 광대역 수신단 구현 및 성능 평가에 관한 연구)

  • 전중성;김동일;배정철
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.3 no.3
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    • pp.569-577
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    • 1999
  • A wideband RF receiver for satellite mobile communications system was fabricated and evaluated of performance in low noise amplifier and high gain amplifier. The low noise amplifier used to the resistive decoupling and self-bias circuits. The low noise amplifier is fabricated with both the RF circuits and the self-bias circuits. Using a INA-03184, the high gain amplifier consists of matched amplifier type. The active bias circuitry can be used to provide temperature stability without requiring the large voltage drop or relatively high-dissipated power needed with a bias stabilized resistor. The bandpass filter was used to reduce a spurious level. As a result, the characteristics of the receiver implemented here show more than 55 dB in gain, 50.83 dBc in a spurious level and less than 1.8 : 1 in input and output voltage standing wave ratio(VSWR), especially the carrier to noise ratio is a 43.15 dB/Hz at a 1 KHz from 1537.5 MHz.

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