Portable wireless apparatus
View Patent ↗The present invention provides a folding type and portable wireless apparatus with a built-in antenna, particularly a portable wireless apparatus that reduces a local average SAR and improves performance of antenna. A housing open/close detecting unit 6 detects open/close of bodies 1 and 2 . When the bodies 1 and 2 are open, a first antenna 4 and a wireless circuit 24 are connected and resonant frequency of a second antenna 5 is adjusted into a first frequency bandwidth, and when the bodies 1 and 2 are closed, the resonant frequency of the second antenna 5 is adjusted into the first frequency bandwidth and a second frequency bandwidth and a wireless circuit 24 is connected. Therefore, when the bodies 1 and 2 are open, it is possible to reduce a local average SAR by separating an antenna current. Further, when the bodies 1 and 2 are closed, it is possible to obtain a high antenna gain.
1. A portable wireless apparatus, in which:
a first housing and a second housing are pivotably connected by a hinge portion;
the first housing includes a first antenna element;
the second housing includes a second antenna element, a circuit board having a gland pattern, and a second power feeding portion provided at an end of the second antenna element; and
the hinge portion includes a first hinge portion and a second hinge portion that are made of an electrical conductive metal and a connecting portion that electrically connects the first hinge portion with the second hinge portion and rotatably supports the first and second hinge portions, the first hinge portion being electrically connected to the hinge portion-sided end of the first antenna element of the first housing, and the second hinge portion being disposed at a predetermined distance from the gland pattern on the circuit board of the second housing and provided with a first power feeding portion;
wherein the portable wireless apparatus comprises:
an antenna switching circuit that selectively connects one of the first antenna element and the second antenna element to a wireless circuit;
a resonance circuit and a matching circuit that are selectively connected to the second antenna element;
a switching circuit that connects the second power feeding portion with one of the resonance circuit and the matching circuit; and
an open/close detecting unit that detects an open/close state of the first housing and the second housing;
wherein the antenna switching circuit selects the first antenna element while the switching circuit selects the resonance circuit, in case such that the first housing and the second housing are opened; and
wherein the antenna switching circuit selects the second antenna element while the switching circuit selects the matching circuit and power is supplied through the matching circuit, in case such that the first housing and the second housing are closed.
2. The portable wireless apparatus according to claim 1 , wherein the resonance circuit is set such that the second antenna element connected with the resonance circuit resonates in a first frequency bandwidth, in case such that the first housing and the second housing are opened, and
wherein the matching circuit is set such that the second antenna element resonates in the first frequency bandwidth and a second frequency bandwidth, in case such that the first housing and the second housing are closed.
3. A portable wireless apparatus having an open state and a closed state, comprising:
a first housing operatively coupled to a second housing, wherein the first housing includes a first antenna element and the second housing includes a second antenna element;
a resonance circuit;
a first matching circuit and a second matching circuit;
an antenna switching circuit; and
a switching circuit;
wherein the antenna switching circuit selectively connects the first antenna element to the first matching circuit, and the switching circuit selectively connects the second antenna element to the resonance circuit when the first housing and the second housing are in the open state; and
wherein the antenna switching circuit and the switching circuit selectively connect the second antenna element to the second matching circuit when the first housing and the second housing are in the closed state.