METHOD FOR SHORTENING MECHANICAL LENGTH OF COLINEAR ANTENNA AND COLINEAR ANTENNA SHORTENED IN MECHANICAL LENGTH

摘要

PROBLEM TO BE SOLVED: To shorten the mechanical length without varying electric length by improving an antenna constituted of a phase shifting coil 3 arranged between two λ/2 wire antenna elements and connected mutually. ;SOLUTION: Both ends of the λ/2 wire antenna elements are formed in a helical coil shape t constitute parts 1a and 1b, and 2a and 1b which operate as loading coils, and while characteristics of resonance of λ/2 are maintained, the mechanical length is shortened. The phase shifting coil 3 is arranged between the two wire coil antenna elements which are shortened in mechanical length and combined.;COPYRIGHT: (C)1997,JPO