| 摘要 |
A small-size wide-band antenna (103) includes a radiation element formed on a dielectric substrate (1) and a coaxial cable (2) as power supply unit for supplying dipole potential to the radiating element. The radiation element includes a ground potential unit to which ground potential is supplied via an external conductor (4) of the coaxial cable and an opposite-pole potential unit to which a potential forming a pair with the ground potential is supplied via a center conductor (3) of the coaxial cable. The ground potential unit includes a pair of conductors (13,14) formed in a tapered shape on the front and rear surfaces of the dielectric substrate and mutually capacitively coupled. The opposite-pole potential unit includes a pair of conductors (31,32) formed in a tapered shape on the front and rear surfaces of the dielectric substrate and mutually capacitively coupled. Each of the ground potential unit and opposite-pole potential unit has a power supply point at a tapered apex of the conductor (13,31). The small-size wide-band antenna (103) further includes a stub conductor (17) as an impedance matching unit for matching the impedance between the radiation element and power supply unit.
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