1 GHz RF bandpass filter
A 1 GHz filter can be built using lumped elements and might be suitable for your purposes, but a better filter could be built using microstrip or a cavity. It depends on your requirements. The filter type depends on the performance you require; for instance, a Butterworth filter is optimal in terms of pass-band ripple.

I use this software for LC filter design: http://tonnesoftware.com/elsie.html. It's excellent.

I'd prototype the filter on a piece of PCB material, and test and adjust it using a suitable signal generator and RF meter. If it's a one-off, you can simply mount it in a screened enclosure with the input and output connectors.