Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
Antenna apparatus comprising an antenna member (10) extending parallel to a ground plane (44), a grounding connector connecting said antenna member (10) to said ground plane (44) and a feed connector (18,36,38) connecting said antenna member (10) to antenna circuitry, characterized in that said antenna member (10) comprises first and second portions (12,14) extending parallel to said plane (44) and forming an L-shaped member (10,20,22).
Claim 2
Dependent Claim
17 words
Apparatus according to claim 1 characterized in that said L-shaped member (10,20,22) is formed from a sheet.
Claim 3
Dependent Claim
42 words
Apparatus according to claim 1 or 2, characterized by two antenna members (20,22) as specified in claim 1 respectively connected by two grounding connectors (32,34) to said ground plane (44), and switch means (30) for switching between said two antenna members (20,22).
Claim 4
Dependent Claim
33 words
Apparatus according to claim 3, characterized in that said two antenna members (20,22) are mounted on said ground plane (44) such that said first and second portions (12,14) extend in a rectangular manner.
Claim 5
Dependent Claim
72 words
Apparatus according to claim 3 or 4, characterized in that both of said antenna members (20,22) are arranged for operation in a receive mode, only one (20) of said antenna members is arranged for operation in a transmit mode and said switch means (30) is provided for switching between the two antenna members (20,22) in the receive mode and for switching to said only one antenna member (20) in said transmit mode.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 5, characterized in that said switch means (30) is arranged to switch the antenna member that is not to receive or transmit into a passive state.
Claim 7
Dependent Claim
32 words
Apparatus according to claim 6, characterized in that said switch means (30) is arranged to selectively ground the feed connectors (36,38) so as to switch said antenna member to a passive state.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 5, 6 or 7, characterized in that said switch means (30) comprises a single-pole-double-terminal switch.
Claim 9
Dependent Claim
66 words
Apparatus according to any one of claims 5 to 8, characterized in that said switch means (30) is connected to said only one antenna member (20) by way of two series-connected quarter wavelength stubs (64,66) and is arranged to provide a ground connection to the stub (64) connected thereto when a transmitter power stage (28) is to be connected to said only one antenna member (20).
Claim 10
Dependent Claim
27 words
Apparatus according to claim 9, characterized in that said power stage (28) is connected between said quarter wavelength stubs (64,66) by way of an impedance transformer (62).