Which sensors should be used for detetecting of signals and which type of antenna should be used for transmitting and receiving signals.
It depends a lot of the radar type. Basically you should have some kind of transmitter in the same frequency band as radar. Also, it depends of the purpose of the jamming: you want to hide a plane, or to tease the operators? Most military radars are implementing complicated anti-jamming schemes; also there may be an altimeter and a goniometer, working on different frequencies. Or do you want to jam a speed radar?
A common issue of radar jamming is in the 5GHz band, where WLAN APs are successfully jamming weather radars. So you don't need to 'make' anything, but to use an AP with a high gain antenna towards the radar site, on radar channels. The effect will be that radar operators will have difficulty to predict the rain in the jammed sector (and some very nice guys will search for the jammer site in order to congratulate the jammer operator, of course).
You may want to check this out: https://www.researchgate.net/publication/4194880_5_GHz_RLAN_interference_on_active_meteorological_radars?ev=pub_cit
Conference Paper 5 GHz RLAN interference on active meteorological radars
You need to narrow down your requirements. But start out with an omni antenna and noise.
Dear James, Omni antenna has very less directivity, but for RADAR we require highly dirrective antenna. So how can we use an omni antenna???
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