Design of omnidirectional slot antennas with vertical polarization

The design of thin omnidirectional transmitting antennas with vertical polarization is discussed. The antenna is realized as a broadside slot array in order to make use of the simplicity and high power-handling capabilities of this principle. The design of the antennas was accomplished by the use of an equivalent circuit. The radiating elements are characterized by series elements connected through a transmission line with characteristic impedance Z/sub I/. If the equivalent circuit is terminated by a short the array is said to be resonant or standing-wave fed. For a termination Z/sub I/ the array is said to be nonresonant or traveling-wave fed. As an example, the measured azimuth and elevation radiation patterns of a resonant slot array with eight radiating bays of slots are presented. The directivity of the antenna was measured at about 10 dB.<>