JP2003051712A5 - - Google Patents

Claims (20)

A ground conductor;
An antenna element disposed on the ground conductor so as to face the ground conductor;
At least one coupling element provided between the ground conductor and the antenna element so as to face the ground conductor and the antenna element;
First connection means for electrically connecting the antenna element and the ground conductor in at least one place ;
A second connecting means for electrically connecting the antenna element and the coupling element in at least one place;
The connection point by the second connection means is disposed in the vicinity of the connection point by the first connection means .   2. The inverted F antenna device according to claim 1, wherein the ground conductor, the antenna element, and the coupling element are provided so as to be substantially parallel to each other.   The distance between the antenna element and the ground conductor at the end where the antenna element and the ground conductor are electrically connected by the first connecting means is the other side opposite to the end. 2. The inverted F-type antenna device according to claim 1, wherein the antenna element and the connection conductor are provided so as to be different from a distance between the antenna element and the ground conductor at an end portion. 4. The inverted F-type antenna device according to claim 3, wherein the at least one coupling element is inclined with respect to the ground conductor.   2. The inverted F-type antenna device according to claim 1, wherein the antenna element has a shape bent along a shape of a housing that accommodates the inverted F-type antenna device. Inverted F-type antenna apparatus according to claim 1, characterized in that provided by bending at least one part of the at least one coupling element and the antenna element.   2. The inverted F antenna device according to claim 1, wherein a part of the ground conductor is bent.   The total length of two different sides of the ground conductor is 1 / of the wavelength corresponding to the lowest frequency band among the frequency bands used in the portable radio communication apparatus using the inverted F-type antenna device. The inverted F-type antenna device according to claim 1, wherein the inverted F-type antenna device is 4 or less. When the inverted F-type antenna device is excited by a radio signal having a predetermined wavelength, a current standing wave generated at the antenna element and the at least one coupling element substantially at the connection point by the second connection means. The dimensions of the antenna element and the at least one coupling element are set so that the at least one coupling element operates as a quarter-wave resonator at a portion of the antinode. 1 inverted F-type antenna apparatus as claimed. The said 2nd connection means is comprised by the common electric power feeding conductor which electrically connects the said antenna element and the said at least 1 coupling element , The any one of the Claims 1 thru | or 9 characterized by the above-mentioned. The inverted F-type antenna device described in 1. The said 2nd connection means is comprised by the common short circuit conductor which electrically connects the said antenna element and the said at least 1 coupling element , The one of Claim 1 thru | or 9 characterized by the above-mentioned. The inverted F-type antenna device described in 1. Inverted F-type antenna apparatus characterized by a more adjusting the resonance frequency of the inverted F-type antenna apparatus, the slit bets formed in the antenna device according to any one of claims 1 to 11. Inverted F-type antenna apparatus characterized by a more adjusting the resonance frequency of the inverted F-type antenna apparatus, the slit bets formed in the coupling device according to any one of claims 1 to 11. Inverted F-type antenna apparatus characterized by a more adjusting the resonance frequency of the inverted F-type antenna apparatus, the slot formed in the antenna device according to any one of claims 1 to 11. Inverted F-type antenna apparatus characterized by a more adjusting the resonance frequency of the inverted F-type antenna apparatus, the slot formed in the coupling device according to any one of claims 1 to 11. 16. The amount of electromagnetic coupling between the antenna element and the ground conductor is adjusted by changing an area of at least one of the antenna element and the at least one coupling element. The inverted F-type antenna device according to any one of the above. In the inverted F-type antenna apparatus according to any one of claims 1 to 16, further inverted F-type antenna apparatus characterized by filled with dielectric part of the interior of the inverted F-type antenna apparatus. To resonate in a plurality of frequency bands, inverted F-type antenna apparatus according to any one of claims 1 to 17, characterized in that setting the size of the antenna element and at least one coupling element. 19. A portable wireless communication device comprising an upper housing, a lower housing, and a hinge portion that connects the upper housing and the lower housing, according to any one of claims 1 to 18 . A portable wireless communication device, wherein an inverted F-type antenna device is provided inside the upper housing. The portable radio communication apparatus according to claim 19 , further comprising a monopole antenna.