System for identifying livestock and other individuals

摘要

A gate-shaped antenna (A) is associated with an identification plate (20) working as a marker plate (21) made of a soft material and comprising a flexible printed board (29), an antenna coil (30), a tuning condenser (32) and an electronic circuit (31); said gate-shaped antenna (A) comprising plural unit antennas (1,2) which are each wound as a coil and which are crossed at an angle so that electromagnetic fields can be generated over a wide range of area without interfering with each other at the time of radio wave transmission/reception for retrieving data on said identification plate (20).