| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multiband antenna in which VSWR characteristics cover wide frequency bands, an intra-band radiation gain is superior and impedance matching is facilitated, and further to provide a wireless apparatus using the multiband antenna. <P>SOLUTION: A multiband antenna includes: a first radiation element that operates under a parallel resonance mode, and a second radiation element which is comprised of a part of the first radiation element and operates under a serial resonance mode. The first radiation element is resonated from an upper limit frequency f1bmax in a frequency band f1b of a first transmitting and receiving system to a lower limit frequency f2bmin in a frequency band f2b of a second transmitting and receiving system. The second radiation element is resonated at a lower frequency than the lower limit frequency f2bmin in the frequency band of the second transmitting and receiving system and at a higher frequency than the upper limit frequency f1bmax in the frequency band of the first transmitting and receiving system. A peak frequency of VSWR between a resonant frequency f1r of the first radiation element and a resonant frequency f2r of the second radiation element is lower than the lower limit frequency f2min or higher than the upper limit frequency f1bmax in the frequency band of the first transmitting and receiving system. <P>COPYRIGHT: (C)2011,JPO&INPIT |
