Abstract: A slot antenna having an elongated tube with a slot extending along the longitudinal axis of the tube provides an antenna structure for a wide-band communications antenna. The configuration of the tube and slot provide an antenna with an input impedance of about 50 ohms. A plurality of feed points are spaced along the slot for radiating and receiving wideband RF signals. When oriented vertically with respect to the earth, the antenna radiates and receives horizontally polarized signals with a high rejection of vertically polarized signals. When oriented horizontally with respect to the earth, the antenna radiates and receives vertically polarized signals with a high rejection of horizontally polarized signals. The antenna tube is coupled to a rectangular ground plane extending substantially the length of the antenna tube.

Abstract: An elliptic-shaped cylindrical antenna radiating element having a first side and a second side includes a first rectangular slot disposed in the first side and a second port disposed in the second side. A microstrip feed network located within the antenna radiating element radiates and receives horizontal polarized electromagnetic signals through the first slot and the second slot at a phase difference of about 180 degrees. The antenna radiating element radiates and receives horizontal polarized electromagnetic signals substantially omnidirectionally.