| 摘要 |
PROBLEM TO BE SOLVED: To provide an omnidirectional surface-mounted antenna with a broad band width and a high radiation gain, that uses a substrate with a high dielectric constant so as to attain downsizing and facilitate impedance matching. SOLUTION: The surface-mounted antenna comprises a substrate made of a high dielectric constant material having a dielectric constantεr of 6 or more, a ribbon-shaped radiation electrode having one end which is grounded and the other end which is open, a grounding electrode connected or capacitance- coupled to one end of the radiation electrode, and a current feeding electrode in a portal shape formed on a side surface separate from the radiation electrode with a gap. The area ratio of the grounding electrode at the bottom side of the substrate is a required minimum value of 30% or below, the current-feeding electrode has a current-feeding portion at one end, a grounding portion at the other end, and a portion substantially in alignment with the radiation electrode between them, and the length of the aligning portion, a gap width or a portal shape being able to be properly set as a channel shape, a meandered shape or a crank shape such that capacitance owned by the current-feeding electrode and inductance can be adjusted for easily achieving impedance matching.
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