Impedance matching means between antenna and transmission line

Details Impedance matching means between antenna and transmission line Impedance matching means between antenna and transmission line

2008-03-04

2008-03-04

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

C343S7000MS, C343S815000

Reexamination Certificate

active

07339545

ABSTRACT:
An impedance matching means according to the present invention is used with an antenna and is realized by a parasitic element (3) for tuning an impedance of the antenna. The antenna comprises a grounding plate (2), an radiating body (1) arranged on the grounding plate (2) and a transmission line (4) coupled to said radiating body (1) and grounding plate (2). The parasitic element (3) formed of a narrow metal sheet and configured as a bridge shape is arranged on the grounding plate (2). The parasitic element (3) has a first and a second ends (311, 321), both of which are electrically connected to the grounding plate (2). The arrangement of the parasitic element (3) results in a change of the impedance of the antenna, so the impedance matching between the antenna and the transmission line (4) can be achieved.

REFERENCES:
patent: 5173715 (1992-12-01), Rodal et al.
patent: 6456249 (2002-09-01), Johnson et al.
patent: 6870507 (2005-03-01), Anguera Pros et al.

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