Abstract
In order to reduce the size of a wireless system, we propose a design theory for the broadband impedance matching circuit which connects an electrically small antenna (ESA) to a semiconductor amplifier. We confirmed its validity for the case of connection between a small slot loop antenna with a small radiation resistance of R a = 0.776 Ω and a semiconductor amplifier with high input impedance of Z L = 321 - j871 Ω with the aid of the simulations by the electrical circuits using transmission lines as well as the electromagnetic.field (EM field) simulator. We also made experiments on this antenna with matching circuits using high temperature superconductor YBCO thin films on MgO substrates.
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