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193results about How to "Less deterioration" patented technology

Antenna and mobile wireless equipment using the same

An object of the invention is to reduce changes of antenna characteristics due to circumstances or usage forms and to obtain good characteristics in any conditions. An antenna apparatus A comprise a tabular ground conductor 1, a radiation conductor 3 disposed in a location facing the ground conductor 1, a short-circuit portion 7 for short-circuiting the ground conductor 1 and the radiation conductor 3, an opening 11 disposed on the ground conductor 1 where the location is positioned at a distance of d from the short-circuit portion 7 in the in-plane direction of the tabular ground conductor 1, and a feed portion 5 extending from the radiation conductor 3 and passing through the opening 11 in a noncontact manner regarding the ground conductor 1. These members are disposed in the vicinity of the lower end of a casing. The feed portion 5 is connected to a matching circuit shown in FIG. 2. The distance d between the short-circuit portion 7 and the feed portion 5 is not less than ⅙ relative to the length of the circumference (the circumference length) of the radiation conductor 3 such that the antenna is not resonant with a desired frequency, and the matching circuit performs adjustment such that the antenna is available in two or more frequency bands. Originally, the antenna per se does not resonate with a desired frequency band, so that it is less susceptible to influences of circumstances or usage forms.
Owner:SHARP KK
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