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Its not a simple matter of matching the transmitter to the radiation
resistance. First a short antenna is going to have a capacitive reactance. You must add an equal amount of inductive reactance (a loading coil) in order to cancel the capacitive reactance and make the antenna resonant at the operating frequency. Then what the transmitter needs to match is the total load impedance of the antenna "system". The load impedance includes the radiation resistance plus the resistance of the loading inductance plus the ground losses. The hardest thing to get a handle on will be the ground losses. The physical size of the transmitter housing is a small portion of a wavelength and losses will change as you handle the unit. |
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