Patent ID: 7447530

Claim:
A portable radio communication apparatus comprising: a housing; a radio communication circuit; a boom portion connected to said housing at at least two points, said boom portion being made of a dielectric material having at least one through hole formed between said housing and said boom portion; first and second antenna elements provided in said boom portion, said first and second antenna elements having electric lengths that are different from each other, wherein said first and second antenna elements are connected to a feeding point of said radio communication circuit, wherein the electric length of said first antenna element is larger than that of said second antenna element, wherein said first antenna element is formed at a position further distinct from a grounding conductor of said radio communication circuit than said second antenna element; a plurality of reactance elements having reactance values that are different from each other; and a switch device for selecting one reactance element among said reactance elements by selectively switching over said reactance elements, and connecting the selected reactance element to at least one of said first and second antenna elements.