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US 5,353,036 AGranted
Dual antenna assembly with antenna retraction inactivation
AssigneeNokia Mobile Phones (U.K.) Limited
InventorFrank Baldry
Life of this patent
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AssigneeNokia Mobile Phones (U.K.) Limited
InventorFrank Baldry
Estimating the term…
An antenna assembly comprises an elongate antenna element (11) mounted in a support (5) and movable between a retracted position (see FIG. 2) and an extended position (see FIG. 1). A helical antenna element (12) is carried at one end of the elongate element. The support (5) comprises a pair of concentric conductors (9,10) which provide a coaxial feed to the antenna elements (11, 12). Suitably the support (5) comprises a dielectric tube (6) having respective conductive portions (9,10) provided on the inner and outer faces thereof. The elongate antenna element is slidably mounted within the central conductor (9). In the retracted position both ends of the elongate antenna element are electrically connected to the central conductor (9). The elongate antenna element is thus rendered inactive as a radiating element and essentially becomes part of the central coaxial feed coupled directly to the helical antenna element. The invention provides a compact and convenient dual antenna arrangement ideally suited for use in a portable cellular radio telephone.
A dual antenna assembly comprising a first antenna having an elongate antenna element mounted in a support and movable between a retracted position and an extended position, a second antenna having a helical antenna element carried by one end of the elongate antenna element, wherein the elongate antenna element is rendered inactive as a radiating means by movement to the retracted position, coupling means effective when the elongate antenna element is in the retracted position to render the helical antenna element operable as a radiating means and conductive feed means coupled to said antenna elements, wherein the elongate antenna element is directly connected to said conductive feed means in the retracted position.
A portable radio transceiver comprising:
An antenna assembly comprising a first elongate antenna element movable between a retracted position and an extended position, a second antenna element carried by one end of the first elongate antenna element, and a pair of substantially concentric conductors providing coaxial feed means to said first and second antenna elements, wherein in the retracted position said first antenna element constitutes at least a substantial part of said coaxial feed means to said second antenna element.
Dependencies are inferred from the claim text.