| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized and economical antenna sharable by two frequency bands. SOLUTION: For this antenna 1, a ground electrode 3 is formed on the entire one surface of a dielectric substrate 2 in a square shape and notches 6 and 7 are formed respectively on the two sides facing each other of the ground electrode 3. A pair of power feeding probes 4 and 5 are made to face each other and formed facing the notch 6 or 7 parallelly to the two sides on the other surface of the dielectric substrate 2, the diagonal one end of the power feeding probes 4 and 5 is respectively turned to a free end and the other ends are respectively extended and connected to a common power feeding terminal 8. In this case, especially, sharing is made possible by first and second resonance frequency bands. Thus, linear metallic parasitic elements 11 and 12 in a length which is about 1/2 of a second resonance wavelength are separated for a distance less than 0.1 wavelength on the respective power feeding probes and disposed so as to be overlapped. The resonance frequency of the antenna in the case of eliminating the parasitic elements 11 and 12 is set to be almost equal to a first resonance frequency. Also, the parasitive elements 11 and 12 are fixed on spacers 13 and 14 made of dielectric for instance. |
