Importance

Loading Importance Indicators...

Abstract

A transmitting and receiving antenna for animal training devices is disclosed. In this antenna, a helical coil, made of an enameled wire, is densely wound around a cylindrical bobbin made of Teflon or a ferrite material. Opposite end portions of the helical coil are bonded to the bobbin using a bonding agent, thus being free from undesirably loosening on the bobbin. A core, used for setting a desired specific frequency band of transmitted or received signals, is threaded into an internally-threaded hole of the bobbin. The bobbin is assembled with an internally-threaded bushing of a stud bolt at its externally-threaded part, with one end of the helical coil fixed to the stud bolt through a soldering process. In the above antenna, all the hexagonal body of the stud bolt, the helical coil and the core are covered with a protection cover. Due to the structure of the core movably threaded into the internally-threaded hole of the bobbin, it is easy for a user to precisely and finely set or change a desired frequency band of signals by appropriately rotating the core clockwise or counterclockwise relative to the bobbin. This results in an improved production yield of such antennae. This antenna is also free from using a conventional coil spring, thus preferably having a desired short length and being convenient to a user while carrying or using it.

Loading the Abstract Image...

First Claim