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Basic Antenna Theory - Wireless

Basic Antenna TheoryRyszard StruzakNote: These are preliminary notes, intended only for distribution among the participants. Beware of misprints! ICTP-ITU-URSI School on Wireless Networking for DevelopmentThe Abdus Salam International Centre for Theoretical Physics ICTP, Trieste (Italy), 5 to 24 February 2007R Struzak 2 Purpose to refresh Basic physical conceptsneeded to understand better the operation and design of microwave antennasR Struzak 3 Outline Introduction Review of Basic Antenna types Radiation pattern, gain, polarization Equivalent circuit & radiation efficiency Smart antennas Some Theory SummaryR Struzak 4 QuizTransmitting antennas used to radiate RF energy, whereasreceiving antennas designed to capture RF energy Somebody told that receiving antennas,radiate radio waves during the reception Is it a true fact or a slip of the tongue?R Struzak 5 It is Struzak 6 Intended & unintended radiators Intended antennas To produce/ receive specified EM waves: Radiocommunication antennas; Measuring antennas; EM sensors, probes; EM applicators (Industrial, Medical, Scientific)R Struzak 7 Unintended antennas - active EM waves radiated as an unintended side-effect: Any conductor/ installation with varying electrical current ( electrical installation of vehicles) Any slot/ opening in the screen of a device/ cable carrying RF current R Struzak 8 Unintended antennas - passive A

the INF antenna. The load is a quarter-wavelength stub, i.e. a narrowband device. • When the feed point is moved to the short-circuited end of the slot (or INF) antenna, the impedance decreases. When it is moved to the slot center (or open …

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