The input impedance of aerial

     Definition: Aerial inputs those who carry signal voltage and signal electricity to compare, call the input impedance of aerial. Input impedance has resistor heft Rin and reactance heft Xin, namely Zin = Rin + J Xin. The existence of reactance heft can reduce aerial to be opposite from line of make a present of the extraction of signal power, accordingly, must make reactance heft is as far as possible 0, answer to make the input impedance of aerial is pure resistor as far as possible namely. In fact, even if design, debugs very well antenna, a little reactance weight still always is contained to be worth in its input impedance.
     The structure that inputs impedance and antenna, dimension and working wavelengh are concerned, half semmetry brace up child it is the most important basic antenna, its input impedance to be 42.5 (of ｊ of ＋ of Zin = 73.1) . Should shorten its length (3 ～ 5) when ％ , can eliminate among them reactance heft, make the input impedance of aerial is pure resistor, right now input impedance is Zin = 73.1 (Europe) , (nominal 75) . Attention, say strictly, the aerial input impedance of pure resistor sex is to nodding frequency character only. 

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    Point out incidentally, half amount to brace up child input impedance is half semmetry brace up child fourfold, namely Zin = 280 () , (nominal 300 Europe) . Interesting is, to either antenna, people always can be debugged through aerial impedance, inside the working frequency limits of the requirement, the empty department that makes input impedance is very small and real department is close to 50 Europe quite, make thereby the input impedance of aerial is Europe of Zin = Rin = 50-----This is aerial can be in good impedance to match place with line of make a present of must.

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