Portable radio apparatus having variable impedance matching circuit between antenna and radio circuit
AssigneeNEC Corporation
InventorYoshiharu Tamura
Life of this patent
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Abstract
A portable radio apparatus having a casing thereof keeps a matching state of an antenna thereof in the call waiting state and in the operating state of the apparatus. The casing is foldable and expandable and accommodates therein a transmitting and receiving circuit connected via a variable matching circuit to the antenna. The matching circuit is connected to a sensor disposed in the casing for sensing a folded state thereof. Depending on a result of the sensing operation of the sensor, the matching circuit changes the matching state.
Claims12
A portable radio apparatus having an antenna and a foldable casing accommodating therein a radio circuit, said apparatus comprising:
- variable matching means for establishing a matching between said radio circuit and said antenna;
- and
- sensing means for sensing a folded state of said casing,
- said variable matching means altering a matching state between said radio circuit and said antenna depending on the sensing result of said sensing means.
A method of impedance matching an antenna of a portable radio apparatus and a radio circuit of same, comprising the steps of:
- accommodating said radio circuit into at least one of first and second casings of said apparatus, said first and second casings being foldable and unfoldable;
- detecting the folded or unfolded state of said first and second casings;
- and
- responsive to the result of said detecting step, changing impedance between said antenna and radio circuit so that they impedance match with each other.
Dependencies are inferred from the claim text.