Planar antenna structure

Details Planar antenna structure Planar antenna structure

2005-07-26

2005-07-26

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000

Reexamination Certificate

active

06922171

ABSTRACT:
The invention relates to planar antennas the structural components of which include a parasitic element. The antenna structure comprises a PIFA-type structure (230, 210, 202) to be placed inside the covers of a mobile station. The PIFA is fed parasitically e.g. through a conductive strip (240) placed on the same insulating board. The feed conductor (203) of the whole antenna structure is in galvanic contact with this feed element; a short-circuit point the feed element doesn't have. The feed element (240) also serves as an auxiliary radiator. The resonance frequencies of the antenna elements or their parts are arranged according to need so as to overlap, to be close to each other or to be relatively wide apart. The structure may also comprise a whip element in connection with the feed element. According to the invention, a relatively simple structure provides a reliable dual resonance and, hence, a relatively wideband antenna when the resonances are close to each other. Moreover, no polarization rotation takes place in the antenna radiation inside the frequency band realized through the dual resonance.

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European Search Report; EP 01 66 0016; Documents considered to be relevant.
“Improved analysis method for broadband rectangular microstrip antenna geometry using E-plane gap coupling,” Cho, YK, Electronics Letters, Oct. 28, 1993, vol. 29, No. 22, pp. 1907-1909.

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