Abstract: A right-angle waveguide probe antenna with a bandwidth greater than 15% of the center frequency of the operating band, as defined by a return loss over the frequency range better than or equal to ?20 dBV. This invention is most relevant to a right-angle coaxial to an air-filled rectangular waveguide transition. The probe antenna is comprised of a flared section followed by a rectangular section resulting in an irregular convex pentagon shape with two right angles at the base which resembles an A-frame on top of a rectangle. The resultant “A-frame probe” can be connected to a coaxial feed cable and extended into a waveguide through an aperture. The A-frame probe operates as a TE10 mode waveguide radiator, and is sized and positioned such that the impedance of the probe antenna is closely matched to the impedance of the waveguide across a wider frequency band.

Abstract: A dielectrically loaded rectangular waveguide to air-filled rectangular waveguide adapter and right-angle waveguide probe antenna with a bandwidth greater than 15% of the center frequency of the operating band, as defined by a return loss over the frequency range better than or equal to ?20 dBV. This invention is most relevant to a right-angle coaxial to a dielectrically loaded rectangular waveguide, followed by an air-filled rectangular waveguide transition. The dielectrically loaded rectangular waveguide to air-filled rectangular waveguide adapter is comprised of a relatively narrow dielectrically loaded rectangular waveguide section, a relatively wide air-filled rectangular waveguide section following the dielectrically loaded rectangular waveguide section of equal height, and a right-angle waveguide probe antenna. The probe antenna is comprised of a tapered cylinder that results in an inverted conical shape resembling a V-frame.