Abstract: A zigzag antenna for broadcasting circularly polarized electromagnetic energy at a mean wavelength L. The zigzag antenna includes a zigzag shaped radiating element (10, 12) composed of plural essentially linear segments (20). These segments, each L/4 in length, are disposed end-to-end with each segment being at right angles to adjacent segments. L/2 non-radiating delay lines (22) are interposed between adjacent segments at alternate junctions between the segments, with the segments being directly joined at the remaining junctions. When fed with electromagnetic energy, the element will broadcast circularly polarized waves since each pair of adjacent segments are orthogonal in space and phase. In the described antenna embodiment, two radiators (10, 12) are arranged above a reflecting panel (16), and are fed from a central feed point (14).

Abstract: A slot antenna having particular application to the field of UHF broadcasting. The antenna is comprised of a rigid coaxial waveguide which is dimensioned so that electromagnetic energy propagates therethrough in the TE.sub.11 mode. Two longitudinal baffles are provided at diametrically opposing circumferential positions within the waveguide. These baffles stabilize the orientation of the mode (i.e., the mode polarization) within the waveguide so that it is known. Alternate methods of establishing a fixed mode polarization are also disclosed. Slots are provided along the exterior of the waveguide in appropriate circumferential positions relative to the mode polarization. Since the TE.sub.11 mode includes both longitudinal and transverse current components, vertical, horizontal, or circular polarization may be generated through the selection of appropriate positions, shape, and orientations for the radiating slots.