Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2005-02-15
2005-02-15
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S787000
Reexamination Certificate
active
06856293
ABSTRACT:
Antenna structure (200) which finds particular utility in mobile stations and the electrical characteristics of which can be electrically modified. The radiating element (210) of the antenna or a part thereof is manufactured from a strongly magnetostrictive material. The antenna is equipped with at least one electromagnet (220) by means of which a magnetic field (ψ) can be generated into the magnetostrictive material. This causes the radiating element to grow (Δl) in a certain direction, whereby the resonance frequency of the antenna will decrease. The antenna can be electrically adjusted without adding any component in the antenna itself, thereby making the adjustment reliable.
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P.J. Rainville and F.J. Harackiewicz, “Magnetic Tuning of a Microtrip Patch Antenna Fabricated on a Ferrite Film”, IEEE Microwave and Guided Wave Letters, vol. 2, No. 12, Dec. 1992. pp. 483-485.
Darby & Darby
Filtronic LK Oy
Phan Tho
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