Trapped-radiation microwave transmission line

Claim 1

An electric wave transmission line comprising a dielectric body and an electrically-conductive body spaced apart a distance (h) in fixed relation with respective first surfaces of each confronting each other and forming in part the enclosing walls of an enclosed elongated channel of width (S), said conductive body having two side walls bounding said channel extending toward said dielectric body into contact therewith along two paths each having a width (y), an electrical conductor strip of width (W) supported on said first surface of the dielectric body within and extending along the channel, the dielectric body having a second surface outside the channel and opposite to said first surface, which second surface directly confronts the surrounding region free of any intervening electric conductor, said width (y) being approximately W/2, said width (S) being less than half a wavelength at the operating frequency, and being substantially two to three times greater than said width (W), said distance (h) being less than the quantity (S-W)/2.