Choice of dielectric substrates for UWB antennas

[Ershadh]

Hi,
I 'm working on UWB Antennas. I 've read many papers related to it. In every paper they have used FR-4 as the dielectric substrate for the Ultra Wide Band Antenna. Could anyone explain why have they gone for that choice?

Why not any other substrate with lesser dielectric constant than it to widen the bandwidth furthermore?

What properties in FR-4 makes it suitable for UWB which other substrates don't have?

Or do other substrates have which we can use?

 

[volker_muehlhaus]

In every paper they have used FR-4 as the dielectric substrate for the Ultra Wide Band Antenna. Could anyone explain why have they gone for that choice?

This is the standard material for PCB design, and for cost optimization, people try to integrate the antenna onto the same standard PCB as the circuit.