Lumped Element Filters, using discrete capacitors and inductors, are the technology of choice below 500MHz and are useful to 3GHz. 

Efficient filter prototypes such as elliptic and psuedo-elliptic, which give very steep rejections can be realised.

A very wide range of circuits can be offered :-

Lowpass

Bandpass

Bandstop (Notch)

Diplexers including Lowpass/Highpass DiplexersHighpass

Allpass equalisation networks and phase or amplitude equalisers

Drop in or Connectorised versions available

1031 bpf1 1

 

1023 q007 bsf4lp composite

1022 q007 bsp4 all