I am trying to design a solid state TX/RX switch for VHF (2-meter).

DC (when TX)
|
| pin diode
TX-------|---------- Antenna
|
delay line
|
|-------- RX
V (pin diode)
GND

(I am not good at ASCII drwaings !)

My problem is the design of the 1/4 wave line that allows the RX input to be
grounded while showing an open circuit at the antenna. One possible
implementation would be a length of coax but at VHF frequencies that will be
messy. Commercial equipments just use an LC circuit. I am looking for a
pointer to the design of this cicuit.

Thanks,
Bernard