초록 ▼

A direction finding antenna for use in missiles and the like may include arrays of log periodic monopole antennas. The antennas may be constructed of thin, metallic stub regions laminated to an insulative support backing as a part of a wing of a missile. The antennas are triangular in shape in order

A direction finding antenna for use in missiles and the like may include arrays of log periodic monopole antennas. The antennas may be constructed of thin, metallic stub regions laminated to an insulative support backing as a part of a wing of a missile. The antennas are triangular in shape in order to provide improved performance and to conform to the shape of wings on the missile. The antennas perform an aerodynamic function as parts of the wings as well as performing an electromagnetic function in the direction finding system. The antennas are provided with parallel feed lines which extend along the base of the triangular antenna, connecting with antenna stubs on both sides of the support backing, and connecting together at the forward end of the antenna. The antenna stubs are generally rectangular metallic sheets arranged in order of increasing length on the support backing. Electrically longer antenna stubs may be provided with zig-zag convolutions for improved performance at lower radio frequencies.

대표청구항 ▼

A direction finding antenna system for use on an aerospace vehicle, said antenna system comprising: a plurality of log periodic monopole antennas, wherein each of said antennas includes a plurality of antenna stubs arranged in a substantially log periodic sequence, wherein said stubs are mounted on

A direction finding antenna system for use on an aerospace vehicle, said antenna system comprising: a plurality of log periodic monopole antennas, wherein each of said antennas includes a plurality of antenna stubs arranged in a substantially log periodic sequence, wherein said stubs are mounted on an aerodynamic wing on the outside of said vehicle in order to conserve space inside said missile, and wherein at least one of said stubs undulates so as to produce lower resonant frequencies for said stubs; and a feedline for each of said antennas and connected to said stubs so that adjacent ones of said stubs are electrically out of phase, so that performance of said plurality of said antennas is preferentially enhanced in a forward direction towards the nose of said vehicle thus improving the ability of said missile to track a target.