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In a DC circuit, the condition is satisfied if the load resistance equals the source resistance.

Antennas which are not a significant fraction of a wavelength in size are inevitably inefficient due to their small radiation resistance.

An is a passive network generally a combination of inductive and capacitive circuit elements used for in between the antenna and the transmitter or receiver.

However, going to larger frequencies, this design constraint gradually relaxes.

The power supplied to the antenna terminals which is not radiated is converted into heat.

64 As the antenna goes up in height The center Frequency will go down.

In other words, when the identification device to be arranged in the roll uses a directional antenna element, the direction of the maximum of the antenna radiation beam is not known.

Another extreme case of impedance matching occurs when using a small usually, but not always, for receiving at a relatively low frequency where it appears almost as a pure inductor.

In both cases the tap-point A distance above band-point B sets maximum impedance ratio, because the tap point determines maximum operating Q and available voltage at the common junction of L1 top, C1, and C2.

This produces numbers where a rule of thumb works.