Multi-band monopole antenna

摘要

A multi-band monopole antenna includes a first radiation conductor portion formed with a rod member having a length defined in accordance with a wavelength of a first frequency included in a predetermined first frequency band among plural frequency bands, and a second radiation conductor portion integrally connected with the first radiation conductor portion and formed with a planar member in which a direct distance from a feeding portion to a farthest point which is the farthest position from the feeding portion is defined in accordance with a wavelength of a second frequency included in a second frequency band which differs from the first frequency band among the plural frequency bands. The feeding portion is provided at a position based on the length defined in accordance with the wavelength of the first frequency relative to a position of a tip end of the first radiation conductor portion.

主权项

1. A multi-band monopole antenna, comprising:
a first radiation conductor portion formed with a rod member having a length defined in accordance with a wavelength of a first frequency included in a predetermined first frequency band among plural frequency bands; a second radiation conductor portion integrally connected with the first radiation conductor portion and formed with a planar member in which a shortest direct distance from a feeding portion to a farthest point which is the farthest position from the feeding portion is defined in accordance with a wavelength of a second frequency included in a second frequency band which differs from the first frequency band among the plural frequency bands; and wherein the feeding portion is provided at a position based on the length defined in accordance with the wavelength of the first frequency relative to a position of a tip end of the first radiation conductor portion; wherein the feeding portion is provided at the second radiation conductor portion; wherein a portion of an outer rim portion of the planar member of the second radiation conductor portion ranging from the feeding portion to the farthest point is removed, wherein the second radiation conductor portion is structured with the planar member including a pentagonal shape in cross section which is formed by removing a right angle triangle including one of corner portions of a rectangular cross sectional shape, and an outer rim portion exposed by removing the right triangle corresponds to an oblique side, wherein a connecting portion of the second radiation conductor portion connected to the first radiation conductor portion is provided at a corner portion which is positioned opposite to the oblique side, and the feeding portion is provided at one of sides which are adjacent to the oblique side; the opening portion includes an extending portion and a perpendicular portion; the extending portion extends in the same direction as the first radiation conductor portion from the cut oblique side; the perpendicular portion is perpendicular to the extending the portion.