Post on 25-Feb-2023
Antenna EngineeringAntenna Engineering
Introduction (교재소개)
Warren L. Warren L. StutzmanStutzman and Gary A. Thiele, "Antenna and Gary A. Thiele, "Antenna Theory and Design," 3rd ed., Wiley, 2012.Theory and Design," 3rd ed., Wiley, 2012.
0. Text
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Constantine A. Balanis, "Antenna Theory: Analysis and Design," 2nd ed., John Wiley & Sons, 1996.
Kin-Lu Wong, "Compact and Broadband Microstrip Antennas," John Wiley & Sons, 2002.
Antenna EngineeringAntenna Engineering1. Microwave Systems
Transmission
� � Information- Channel bandwidth- Base band- Inefficient wave radiation
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� Modulation – center frequency
Time domain Frequency domain
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Why do we need modulation?
� � Transmission efficiency- Multiplexing- Antenna length: wavelength- Wave radiation: comparison with DC
1. Microwave Systems
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Battery: DCAntenna: AC
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Microwave transmitter (Tx)
� � Up-conversion: frequency
1. Microwave Systems
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( ))cos()cos(2
1)cos()cos( yxyxyx −++=
BBf BBLO ff ± BBLO ff ±
�
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Microwave receiver (Rx)
� � Down-conversion: frequency
1. Microwave Systems
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( ))cos()cos(2
1)cos()cos( yxyxyx −++=
BBfBBIF ff ±BBLO ff ±
IFLO fff −= IFff =
�
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Microwave transceiver
� � Duplexer: bandpass filter or switch- Loss, tx suppression, channel selection
1. Microwave Systems
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IF: superheterodyneNo IF: direct conversion
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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
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Phased array radar
1. Microwave Systems
� � S-band: 2 ~ 4 GHz� Cost: about half billion $
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Several megawatts radar�
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SBX (Sea Based X-band radar)
1. Microwave Systems
� � X-band: 8 ~ 12 GHz� Cost: about 1 billion $� Norway, Russia, and USA� Missile Defense: early warning radar – SBX –
ground based interceptor
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ground based interceptor
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Simple model for antenna
2. Antennas
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Antenna EngineeringAntenna Engineering2. Antennas
Dipole antenna
� � Simple but long structure� Low efficiency
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Microstrip type
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Loop antenna
2. Antennas
� � Simple structure� Low efficiency
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First mobile phone
• Dr. Martin Cooper on 1973
• Motorola
• 850 [g]
2. Antennas
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Helical antenna
2. Antennas
� � Complicated structure� Medium efficiency
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Handy phone antenna
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Array antenna
� � Complicated structure� High efficiency
2. Antennas
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Yagi antenna: one source
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Microstrip patch antenna
2. Antennas
� � Simple and small structure� Low efficiency
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Antenna simulation
Ansoft: Ensemble
2. Antennas
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Ansoft: Ensemble
CST: MWS
Ansoft: HFSS
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무역위원회 2008년보고서
3. Industrial Trend
� 2007년무역수지 5천6백만$적자� 안테나의분류
� 이동통신용� 기지국용� 자동차용
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� 자동차용� 위성방송수신용� 선박용레이다
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Antenna EngineeringAntenna Engineering3. Industrial Trend
안테나산업구조
�
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세계안테나시장- 31억9천만$(2007년)- 37억2천만$(2009년예상)
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