PURPOSE: To attain excellent high frequency characteristic, heat resistance, smoothness and weatherobility by using a silane denatuard crosslinked polyethylene.
CONSTITUTION: In the titled manufacture, the entire rear face of a dielectric base is used as a ground conductor and the surface is provided with a circularly polarized wave radiation microstrip element in the both-side metal clad dielectric base for a plane antenna, a silane denatuard crosslinked polyethylene is used as part of the dielectric, which is formed into the silane denatuard crosslinked polyethylene by heat forming. Thus, the polyethylene with a small gel forming ratio (in fact not cross-linked) before press forming is bonded to a copper foil while being crosslinked by heat/press forming, they are incorporated strongly to obtain a plane antenna base with excellent heat resistance and dielectric characteristic. As required, glass cloth, epoxy resin impregnated glass cloth prepreg, fluorine group resin sheet or film, or a fluororesin impregnated glass cloth prepreg and a silane denatuard crosslinked polyethylene sheet or film are made composite to improve various characteristic such as heat resistance and weatherobility.
YAGI TOSHIAKI
KOGA MASARU
