Antenna

Abstract

A transmission antenna is formed on a transmission-sided board as an electric conducting pattern having a length of ¼(λ/4)±20% of a wavelength, where the transmission-sided board mounts thereon a transmission circuit used in a frequency range defined from 700 [MHz] to 3 [GHz], and a portion of the transmission antenna, which is longer than, or equal to ⅔ of an entire length of the transmission antenna, owns a width wider than, or equal to λ/400. And, an reception antenna is formed on a reception-sided board 202 as an electric conducting pattern having a length of ¼(λ/4)±20% of a wavelength, where the reception-sided board mounts thereon a reception circuit used in a frequency range defined from 700 [MHz] to 3 [GHz], and a portion of the reception antenna, which is longer than, or equal to ⅔ of an entire length of the reception antenna, owns a width wider than, or equal to λ/400.

Dependencies are inferred from the claim text.