Antenna unit and radio communication device

摘要

An antenna unit and a radio communication device are provided. An antenna unit has a monopole antenna section and a loop antenna section. The monopole antenna section includes a linear radiating electrode that resonates at a first frequency and has an electrical length of one-quarter of the wave length corresponding to the first frequency. The loop antenna section includes a radiating electrode that resonates at a second frequency, is vertically erected on a non-ground region, and connected to a feed line. A proximal end of the radiating electrode of the loop antenna section is connected to an intermediate portion of the feed line, and a distal end thereof is connected to a ground region. The electrical length of the radiating electrode of the loop antenna section is one-half of the wave length of the second frequency.

主权项

1. An antenna unit comprising:
a single feed line extending from a feed section onto a non-ground region of a surface of a board; a monopole antenna section including a radiating electrode having a linear shape, the radiating electrode being provided on the non-ground region and including a proximal end and distal end, the proximal end of the radiating electrode being connected to a distal end portion of the feed line and the distal end of the radiating electrode being open; and a loop antenna section including a radiating electrode having a half-loop shape and being vertically erected on the non-ground region, the radiating electrode of the loop antenna section including a proximal end and a distal end, the proximal end of the loop antenna radiation electrode being connected to an intermediate portion of the feed line and the distal end of the loop antenna radiation electrode being grounded, wherein an electrical length of the radiating electrode in the monopole antenna section is set to one-quarter of a wave length corresponding to a first frequency, and an electrical length of the radiating electrode in the loop antenna section is set to one-half of a wave length corresponding to a second frequency that is approximately twice the first frequency.