Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
54 words
An antenna assembly comprising an elongate antenna element mounted in a support and movable between a retracted position and an extended position, and 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.
Claim 2
Dependent Claim
34 words
An antenna assembly as claimed in claim 1, further including conductive feed means coupled to said antenna elements, wherein the elongate antenna element remains connected to said conductive feed means in the retracted position.
Claim 3
Dependent Claim
43 words
An antenna assembly as claimed in claim 1 or claim 2, wherein the support comprises a pair of coaxial conductors providing said feed means to the antenna elements, the elongate antenna element being electrically coupled to the central conductor of the coaxial pair.
Claim 4
Dependent Claim
20 words
An antenna assembly as claimed in claim 3, wherein the elongate antenna element is slidably mounted within the central conductor.
Claim 5
Dependent Claim
46 words
An antenna assembly as claimed in claim 3 or claim 4, wherein means are provided at the end of the elongate antenna element opposite said one end which electrically couple said opposite end of the elongate antenna element to the central conductor of the coaxial pair.
Claim 6
Dependent Claim
53 words
An antenna assembly as claimed in any of claims 3 to 5, including means disposed at said one end of the elongate antenna element which electrically connect said one end of the elongate antenna element to the central conductor of the coaxial pair when the elongate antenna element is in the retracted position.
Claim 7
Dependent Claim
35 words
An antenna assembly as claimed in any of claims 3 to 6, wherein the support comprises a dielectric tube and the coaxial conductors are provided respectively on the internal and external faces of said tube.
Claim 8
Dependent Claim
29 words
An antenna assembly as claimed in any of claims 3 to 6, wherein the coaxial conductors of the support comprise a pair of concentric conductive cylinders in spaced relationship.
Claim 9
Dependent Claim
40 words
An antenna assembly as claimed in any of claims 3 to 8, including contact means which electrically connect the helical antenna element to the central conductor of the coaxial pair when the elongate antenna element is in the retracted position.
Claim 10
Dependent Claim
49 words
An antenna assembly as claimed in claim 9, wherein the contact means comprise a fixed electrical connector present on the support, and a movable electrical connector coupled to the helical antenna element, which movable connector engages the fixed connector when the elongate antenna element is in the retracted position.
Claim 11
Dependent Claim
24 words
An antenna assembly as claimed in claim 10, wherein the fixed connector and the movable connector are in the form of respective concentric colletts.
Claim 12
Dependent Claim
40 words
An antenna assembly as claimed in any of claims 9 to 11, wherein the contact means also connects the elongate antenna element to the central conductor of the coaxial pair when the elongate antenna element is in the retracted position.
Claim 13
Dependent Claim
40 words
An antenna assembly as claimed in any of the preceding claims, wherein the helical antenna element is present at the end of the elongate antenna element remote from the support when the elongate antenna element is in the extended position.
Claim 14
Dependent Claim
35 words
A portable radio transceiver comprising a housing enclosing transmitting and receiver circuitry, and an antenna assembly as claimed in any of the preceding claims, said antenna assembly being coupled to said transmitting and receiving circuitry.