| 摘要 |
A radar transponder for a stable and reliable response transmission upon reception of a weak radar signal having a reflection-conscious circuitry free from damage by a transmit effect, including a reception damage by the leakage of a powerful transmit wave signal and a transmission damage by the reflection of the powerful transmit wave signal. The reflection-conscious circuitry may include a circulator coupled to the transmit/receive antenna for selecting the powerful transmit wave signal or the weak radar signal, a receiving circuit provided after the circulator for receiving the weak radar signal, and an SPDT switch provided between the circulator and the receiving circuit for passing an input of the weak radar signal to the receiving circuit in a receiving period with its ground function dormant and for leading an input of the powerful transmit wave signal to a ground using the ground function in a transmitting period. The SPDT switch includes a reflectionless terminator at the entry of the input signal, a diode having a ground end at the outlet of the input signal, a quarter-wave line between the entry and the outlet and a drive signal input for driving the ground function.
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