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Basics of Antenna Engineering
 

Basics of Antenna Engineering

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An antenna is a very important passive device for wireless communication. This presentation shows the basics of an antenna. Simply speaking, with this file we can understand why an antenna is ...

An antenna is a very important passive device for wireless communication. This presentation shows the basics of an antenna. Simply speaking, with this file we can understand why an antenna is important.

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    Basics of Antenna Engineering Basics of Antenna Engineering Presentation Transcript

    • Antenna Engineering CHO, Yong Heui Basics of Antenna Engineering
    • Introduction ( 교재 소개 ) Warren L. Stutzman and Gary A. Thiele, "Antenna Theory and Design," 3rd ed., Wiley, 2012. Constantine A. Balanis, "Antenna Theory: Analysis and Design," 2nd ed., John Wiley & Sons, 1996. 0. Text Kin-Lu Wong, "Compact and Broadband Microstrip Antennas," John Wiley & Sons, 2002.
    • 1. Microwave Systems Transmission 
      • Information
        • Channel bandwidth
        • Base band
        • Inefficient wave radiation
      • Modulation – center frequency
      Time domain Frequency domain 출처 : RFDH.com
    • Why do we need modulation? 
      • Transmission efficiency
        • Multiplexing
        • Antenna length: wavelength
        • Wave radiation: comparison with DC
      Battery: DC Antenna: AC 1. Microwave Systems
    • Microwave transmitter (Tx) 
      • Up-conversion: frequency
      1. Microwave Systems  출처 : RFDH.com
    • Microwave receiver (Rx) 
      • Down-conversion: frequency
      1. Microwave Systems  출처 : RFDH.com
    • Microwave transceiver 
      • Duplexer: bandpass filter or switch
        • Loss, tx suppression, channel selection
      IF: superheterodyne No IF: direct conversion 1. Microwave Systems 출처 : RFDH.com
    • Antenna 1. Microwave Systems 
      • Important passive device
      • Innovation
    • Aegis combat system: S-band 1. Microwave Systems 
      • SPY-1(1974): phased array radar, smart antenna
      • 4 phased array radars, 3.6m x 3.6m, 4350 elements
    • Phased array radar 1. Microwave Systems Several megawatts radar  
      • S-band: 2 ~ 4 GHz
      • Cost: about half billion $
    • SBX (Sea Based X-band radar) 1. Microwave Systems 
      • X-band: 8 ~ 12 GHz
      • Cost: about 1 billion $
      • Norway, Russia, and USA
      • Missile Defense: early warning radar – SBX – ground based interceptor
    • Hertz antenna (1886) 2. Antennas
    • RC circuits 2. Antennas
    • Simple model for antenna 2. Antennas
    • 2. Antennas Dipole antenna 
      • Simple but long structure
      • Low efficiency
      Microstrip type
    • Loop antenna 2. Antennas 
      • Simple structure
      • Low efficiency
    • First mobile phone
      • Dr. Martin Cooper on 1973
      • Motorola
      • 850 [g]
      2. Antennas
    • Handy phone antenna Helical antenna 2. Antennas 
      • Complicated structure
      • Medium efficiency
    • Triple band antenna 2. Antennas
    • Array antenna 
      • Complicated structure
      • High efficiency
      2. Antennas Yagi antenna: one source
    • Microstrip patch antenna 2. Antennas 
      • Simple and small structure
      • Low efficiency
    • Antenna simulation Ansoft: Ensemble CST: MWS Ansoft: HFSS 2. Antennas
    • 무역위원회 2008 년 보고서 3. Industrial Trend
      • 2007 년 무역수지 5 천 6 백만 $ 적자
      • 안테나의 분류
        • 이동통신용
        • 기지국용
        • 자동차용
        • 위성방송수신용
        • 선박용레이다
      출처 : 무역위원회
    • 3. Industrial Trend 안테나 산업 구조
      • 세계안테나시장
      • 31 억 9 천만 $(2007 년 )
      • 37 억 2 천만 $(2009 년예상 )
    • 3. Industrial Trend 휴대폰 안테나 산업의 경쟁력
    • 3. Industrial Trend 기지국 안테나 산업의 경쟁력
    • 3. Industrial Trend 안테나 산업의 SWOT 분석
    • 3. Industrial Trend 안테나 산업의 문제점과 대응방안
      • 국내 3G 이동통신서비스 설비투자 감소
      • 대 · 중소기업 상생협력 중요산업
      • 전형적인 소량 다품종 산업
      • 원천기술 및 지적재산권 글로벌기업 독점
      • 국내 통신 장비산업 취약
      • 신규 무선통신 서비스 투자 확대 유도
      • 안테나 관련 R&D 정책자금 지원 확대
      • 대 · 중소기업 상생협력 지원
      • 안테나산업의 전략적 육성 지원
      • 국내 Wibro 등 무선통신기기 장비산업 지원