To provide a radio communication terminal compatible with a plurality of frequency bands using one parasitic element.
Between a parasitic element 10 and a ground pattern 11 of a circuit board, a first parasitic element connecting part 12 is interposed which includes a first band limiting section 122 capable of passing through only a signal of a band of 800 MHz and a first reactance element 121 for resonating the parasitic element 10 in the frequency band of 800 MHz when a radio communication terminal 1 is disposed on a metal plate, and between the parasitic element 10 and the ground pattern 11, a second parasitic element connecting part 13 is interposed which includes a second band limiting section 132 capable of passing through only signals of a frequency band of 1.7 GHz to 2.1 GHz and a second reactance element 131 for resonating the parasitic element 10 in the frequency bands when the radio communication terminal 1 is disposed on the metal plate. One parasitic element 10 therefore is compatible with the two frequency bands and in comparison with a case where the parasitic element is provided for each frequency band desired to use, the space saving and cost reduction of the radio communication terminal 1 can be attained.
| JP2009159227A | 2009-07-16 | |||
| JP2005244553A | 2005-09-08 | |||
| JPH1028013A | 1998-01-27 | |||
| JP2006050496A | 2006-02-16 |
Toshimitsu Ichikawa
Kimihide Hashimoto
Next Patent: LOAD DRIVING AND DIAGNOSIS SYSTEM AND CONTROL METHOD