Liquid foam dielectrics for high frequency integratable antennas

An innovative fabrication technique to create nominal height liquid foam substrate layer for integratable antennas is introduced. The liquid foam layer is intended to replace a Rohacell foam or air substrate, especially at millimeter-wave frequencies, where antenna designs require substrate layers less than a millimeter thick. The performance of hi-lo stacked patch antenna with 0.5-mm-thick layer of ECCOSTOCK FPH is presented. The 10-dB return loss bandwidth of the antenna is 18.2%, and the radiation patterns and gain are also presented and discussed.