Optimal Lossy Matching by Pareto Fronts

Low profile, cavity backed spiral on thin ferrite ground plane for high power operation above 200MHz

“…The free standing (no ground plane) antenna gain can even be exceeded when surface waves are excited within the ferrite layer. Further, some material loss can facilitate the design of a matching network, thus improving return loss at low frequencies [4]. Lastly, a low VSWR «2:1) can be achieved by the terminating spiral arms with resistive films (R-Cards) or resistive wires [5].…”