Basics of Antenna Engineering

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Presentation transcript:

Basics of Antenna Engineering

0. Text 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. Kin-Lu Wong, "Compact and Broadband Microstrip Antennas," John Wiley & Sons, 2002.

 Transmission Information Channel bandwidth Base band 1. Microwave Systems Transmission  Information Channel bandwidth Base band Inefficient wave radiation Modulation – center frequency 출처: RFDH.com Time domain Frequency domain

 Why do we need modulation? Transmission efficiency Multiplexing 1. Microwave Systems Why do we need modulation?  Transmission efficiency Multiplexing Antenna length: wavelength Wave radiation: comparison with DC Battery: DC Antenna: AC

  Microwave transmitter (Tx) Up-conversion: frequency 1. Microwave Systems Microwave transmitter (Tx)  Up-conversion: frequency 출처: RFDH.com 

  Microwave receiver (Rx) Down-conversion: frequency 1. Microwave Systems Microwave receiver (Rx)  Down-conversion: frequency 출처: RFDH.com 

 Microwave transceiver Duplexer: bandpass filter or switch 1. Microwave Systems Microwave transceiver  Duplexer: bandpass filter or switch Loss, tx suppression, channel selection 출처: RFDH.com IF: superheterodyne No IF: direct conversion

1. Microwave Systems Antenna  Important passive device Innovation

 Aegis combat system: S-band 1. Microwave Systems Aegis combat system: S-band  SPY-1(1974): phased array radar, smart antenna 4 phased array radars, 3.6m x 3.6m, 4350 elements

  Phased array radar S-band: 2 ~ 4 GHz Cost: about half billion $ 1. Microwave Systems Phased array radar  S-band: 2 ~ 4 GHz Cost: about half billion $  Several megawatts radar

 SBX (Sea Based X-band radar) X-band: 8 ~ 12 GHz 1. Microwave Systems SBX (Sea Based X-band radar)  X-band: 8 ~ 12 GHz Cost: about 1 billion $ Norway, Russia, and USA Missile Defense: early warning radar – SBX – ground based interceptor

2. Antennas Hertz antenna (1886)

2. Antennas RC circuits

Simple model for antenna 2. Antennas Simple model for antenna

 Dipole antenna Simple but long structure Low efficiency 2. Antennas Microstrip type

2. Antennas Loop antenna  Simple structure Low efficiency

First mobile phone 2. Antennas Dr. Martin Cooper on 1973 Motorola 850 [g] 17

 Helical antenna Complicated structure Medium efficiency 2. Antennas Handy phone antenna

2. Antennas Triple band antenna 19

 Array antenna Complicated structure High efficiency 2. Antennas Yagi antenna: one source

 Microstrip patch antenna Simple and small structure Low efficiency

2. Antennas Antenna simulation Ansoft: Ensemble Ansoft: HFSS CST: MWS

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