Insular waveguide ring resonator filter

An insular waveguide band pass ring resonator filter for use in the frequency range from about 1 GHz to about 1,000 GHz comprising a conductive image plane, a first length of elongated high permittivity dielectric waveguide of finite cross section arranged in a closed ring form and disposed adjacent to said conductive image plane, a second length of elongated high permittivity dielectric waveguide of finite cross section disposed adjacent to said conductive image plane and spaced from said first length of waveguide to provide a first coupling region therebetween, a third length of elongated high permittivity dielectric waveguide of finite cross section disposed adjacent to said conductive image plane and spaced from said first length of waveguide on the side thereof opposite said second length of waveguide to provide a second coupling region therebetween, and a thin film of synthetic organic resin disposed between and secured to said conductive image plane and said lengths of waveguide and extending laterally thereof, said thin film being low loss in character and having a low permittivity compared with that of said lengths of waveguide, said second length of waveguide having an inlet port at one end of said first coupling region and a first outlet port at the other end of said first coupling region and spaced from said first length of waveguide a distance substantially greater than the distance between said first and second lengths of waveguide in said first coupling region, said third length of waveguide having a termination at the end of said second coupling region adjacent said first outlet port and a second outlet port at the other end of said second coupling region and spaced from said first length of waveguide a distance greater than the distance between said first and third lengths of waveguide in said second coupling region, said band pass filter passing energy injected into said inlet port from said second length of waveguide through said first length of waveguide and said third length of waveguide and out of said second outlet port when the mean periphery of said first length of waveguide is an integral multiple of the guide wavelength of the energy in said first length of waveguide, said band pass filter passing energy injected into said inlet port from said second length of waveguide and out of said first outlet port when the mean periphery of said first length of waveguide is other than an integral multiple of the guide wavelength of the energy in said first length of waveguide.

An insular waveguide band pass ring resonator filter for use in the frequency range from about 1 GHz to about 1,000 GHz comprising a conductive image plane, a plurality of first lengths of elongated high permittivity dielectric waveguide of finite cross section each arranged in a closed ring form and disposed adjacent to each other and to said conductive image plane, said first lengths of dielectric waveguide being arranged in general longitudinal relation with adjacent sections of adjacent rings being spaced apart to provide first coupling regions therebetween, a second length of elongated high permittivity dielectric waveguide of finite cross section disposed adjacent to said conductive image plane and spaced from one of the endmost ones of said first lengths of waveguide to provide a second coupling region therebetween, a third length of elongated high permittivity dielectric waveguide of finite cross section disposed adjacent to said conductive image plane and spaced from the other endmost one of said first lengths of waveguide to provide a third coupling region therebetween, and a thin film of synthetic organic resin disposed between and secured to said conductive image plane and said lengths of waveguide and extending laterally thereof, said thin film being low loss in character and having a low permittivity compared with that of said lengths of waveguide, said second length of waveguide having an inlet port at one end of said second coupling region and a first outlet port at the other end of said second coupling region and spaced from the adjacent first length of waveguide a distance substantially greater than the distance between said first and second lengths of waveguide in said second coupling region, said third length of waveguide having a termination at one end of said third coupling region and a second outlet port at the other end of said third coupling region and spaced from the adjacent first length of waveguide a distance greater than the distance between said first and third lengths of waveguide in said third coupling region, said band pass filter passing energy injected into said inlet port from said second length of waveguide through the first lengths of waveguide and said third length of waveguide and out of said second outlet port where the mean periphery of said first lengths of waveguide is an integral multiple of the guide wavelength of the energy in said first lengths of waveguide, said band pass filter passing energy injected into said inlet port from said second length of waveguide and out of said first outlet port when the mean periphery of said first lengths of waveguide is other than an integral multiple of the guide wavelength of the energy in said first lengths of waveguide.