basics of antenna engineering
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Basics of Antenna Engineering
Antenna Antenna EngineeringEngineering
CHO, Yong HeuiCHO, Yong Heui
Antenna Antenna EngineeringEngineering
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Introduction ( 교재 소개 )
Warren L. Stutzman and Gary A. Thiele, "Antenna Warren L. Stutzman and Gary A. Thiele, "Antenna Theory and Design," 3rd ed., Wiley, 2012.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.
Antenna Antenna EngineeringEngineering
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1. Microwave Systems
Transmission
Information- Channel bandwidth- Base band- Inefficient wave radiation
Modulation – center frequency
Time domain Frequency domain
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Antenna Antenna EngineeringEngineering
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Why do we need modulation?
Transmission efficiency- Multiplexing- Antenna length: wavelength- Wave radiation: comparison with DC
Battery: DC Antenna: AC
1. Microwave Systems
Antenna Antenna EngineeringEngineering
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Microwave transmitter (Tx)
Up-conversion: frequency
)cos()cos(21)cos()cos( yxyxyx
BBf BBLO ff BBLO ff
1. Microwave Systems
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Microwave receiver (Rx)
Down-conversion: frequency
)cos()cos(21)cos()cos( yxyxyx
BBfBBIF ff BBLO ff
IFLO fff IFff
1. Microwave Systems
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Antenna Antenna EngineeringEngineering
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Microwave transceiver
Duplexer: bandpass filter or switch- Loss, tx suppression, channel selection
IF: superheterodyneNo IF: direct conversion
1. Microwave Systems
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Antenna Antenna EngineeringEngineering
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Antenna 1. Microwave Systems
Important passive device Innovation
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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
Antenna Antenna EngineeringEngineering
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Phased array radar 1. Microwave Systems
Several megawatts radar
S-band: 2 ~ 4 GHz Cost: about half billion $
Antenna Antenna EngineeringEngineering
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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
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Hertz antenna (1886) 2. Antennas
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RC circuits 2. Antennas
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Simple model for antenna 2. Antennas
Antenna Antenna EngineeringEngineering
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2. Antennas
Dipole antenna
Simple but long structure Low efficiency
Microstrip type
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Loop antenna 2. Antennas
Simple structure Low efficiency
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First mobile phone
• Dr. Martin Cooper on 1973• Motorola• 850 [g]
2. Antennas
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Handy phone antenna
Helical antenna 2. Antennas
Complicated structure Medium efficiency
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Triple band antenna 2. Antennas
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Array antenna
Complicated structure High efficiency
2. Antennas
Yagi antenna: one source
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Microstrip patch antenna 2. Antennas
Simple and small structure Low efficiency
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Antenna simulation
Ansoft: Ensemble
CST: MWS
Ansoft: HFSS
2. Antennas
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무역위원회 2008 년 보고서 3. Industrial Trend
2007 년 무역수지 5 천 6 백만 $ 적자 안테나의 분류
이동통신용 기지국용 자동차용 위성방송수신용 선박용레이다
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3. Industrial Trend
안테나 산업 구조
세계안테나시장- 31 억 9 천만 $(2007 년 )- 37 억 2 천만 $(2009 년예상 )
Antenna Antenna EngineeringEngineering
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3. Industrial Trend
휴대폰 안테나 산업의 경쟁력
Antenna Antenna EngineeringEngineering
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3. Industrial Trend
기지국 안테나 산업의 경쟁력
Antenna Antenna EngineeringEngineering
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3. Industrial Trend
안테나 산업의 SWOT 분석
Antenna Antenna EngineeringEngineering
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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
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