| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile communication antenna which is capable of receiving or transmitting signals of mobile communication frequency bands with higher gains. SOLUTION: A ground plate 12 is provided on nearly all the surface of a circuit board 10, and a carrier 14 of dielectric is provided on the circuit board 10. A metal plate 16 is provided on the surface of the carrier 14. The metal plate 16, the ground plate 12 and the board 10 are electrically connected together with a ground connecting wire 18 and a feeder 20 respectively to form an antenna element which serves as an inverse F antenna. A thin belt-like non- feeding element 22 is formed into nearly the L shape on the surface of the carrier 14 so as to be parallel with the side of the metal plate 14, the one edge of the element 22 is made to extend along and close to the metal plate 16, and the other end of the element 22 is electrically connected to the ground plate 12 with a ground connecting wire 24. The electrical length of a series circuit composed of a capacitance component produced between the non-feeding element 22 and the metal plate 16 and an inductance component held by the non-feeding element 22 is set nearly half as long as the wavelength of an operating frequency band.
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