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This is a Radar terminology and is related to the response of transient antennas producing a late-time ringing, which is caused by reflections at the antenna open-end and the limited antenna bandwidth. This phenomenon could distort the received signal. A resistive loading could fix the open-end reflection issue, but with the expense of low radiation efficiency.
As mentioned in the previous reply, it is a Radar teminology. When an ideal GPR antenna is excited, it radiates only during the duration of the excitation pulse. But in reality, the antenna continues to radiate even after the excitation pulse has
died down. This is due to the internal reflections of the charges that occur at the ends of the bowtie wings and the excitation points. The charges move back and forth in the bowtie wings, gradually decaying and radiating at discrete time intervals into the external media. This is known as antenna ringing.
Antenna ringing is undesirable as it corrupts the transmitted pulse waveform and reduces range resolution.
For more information about the type of loading etc & rininging read:
I know this is an old thread but can somebody relate the antenna ringing and the input matching behavior? Does poor S11 lead to higher ringing? Any thoughts around that issue?
Poor antenna match, poor transmit match, and some cable length between the two is a recipe for time domain ringing.
In the case of UWB pulses where the waveshape is critical, the actual impulse response of the antenna (not just the amplitude response) has a drastic effect on ringing.
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