Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A matching circuit (10; 20; 31 - 38) connected to an antenna body (11), the antenna body (11) comprising a radiation conductor (4) and a power supply terminal (15) and having an equivalent circuit comprising an inductance component (1), a resistance component (2) and a capacitance component (3) connected in series, said matching circuit comprising an inductance element (12) connected in series with said antenna body (11), first and second capacitance elements (13, 14; 13, 39, 14; 13, 40, 14; 13, 39, 40, 14) to respective terminals (A, B) of the inductance element (12) in parallel with the antenna body (11), the first capacitance element (13; 13, 39) comprising a variable capacitance element (13).
Claim 2
Dependent Claim
111 words
A matching circuit (10; 20; 31 - 38) connected to an antenna body (11), the antenna body (11) comprising a radiation conductor (4) and a power supply terminal (15) and having an equivalent circuit comprising an inductance component (1), a resistance component (2) and a capacitance component (3) connected in series, said matching circuit comprising an inductance element (12) connected in series with said antenna body (11), first and second capacitance elements (13, 14; 13, 39, 14; 13, 14, 40) connected between respective terminals (A, B) of the inductance element (13, 39, 14, 40) and a ground terminal, the first capacitance element (13; 13, 39) comprising a variable capacitance element (13).
Claim 3
Dependent Claim
26 words
The matching circuit (20; 31 - 38) of claim 1 or 2, wherein the second capacitance element (14; 14, 40) comprises a variable capacitance element (14).
Claim 4
Dependent Claim
41 words
The matching circuit (10; 20; 31 - 38) of claim 1 or 2, wherein the resonance frequency of an antenna apparatus (16) comprising the antenna body (11) and the matching circuit can be varied by varying the variable capacitance element (13).
Claim 5
Dependent Claim
26 words
The matching circuit (10; 33 - 38) of claim 1 or 2, wherein the second capacitance element (14; 14, 40) comprises a fixed capacitance element (40).
Claim 6
Dependent Claim
38 words
The matching circuit (20; 31 - 38) of claim 3, wherein an input impedance of an antenna apparatus (16) comprising the antenna body (11) and the matching circuit can be adjusted by adjusting said second capacitance element (14).
Claim 7
Dependent Claim
31 words
The matching circuit (10; 20; 31 - 38) of claim 4, wherein the variable capacitance element (13) can be varied over a range of resonance frequencies of the antenna apparatus (16).
Claim 8
Dependent Claim
37 words
The matching circuit (10; 20; 31 - 38) of claim 7, wherein the variable capacitance (13) comprises a varactor diode responsive to an applied voltage thereby to adjust the resonance frequency over the range of resonance frequencies.
Claim 9
Dependent Claim
26 words
The matching circuit (31; 35; 36) of claim 1 or 2, further comprising a fixed capacitance element (39) in series with said first capacitance element (13).
Claim 10
Dependent Claim
26 words
The matching circuit (33; 35; 37) of claim 1 or 2, further comprising a fixed capacitance component (40) in series with said second capacitance element (14).
Claim 11
Dependent Claim
26 words
The matching circuit (32; 37; 38) of claim 1 or 2, further comprising a fixed capacitance element (39) in parallel with said first capacitance element (13).
Claim 12
Dependent Claim
26 words
The matching circuit (34; 36; 38) of claim 1 or 2, further comprising a fixed capacitance element (40) in parallel with said second capacitance element (14).
Claim 13
Dependent Claim
73 words
An antenna apparatus (16) comprising an antenna body (11) comprising a radiation conductor (4) and a power supply terminal (15), the antenna body (11) having an equivalent circuit comprising an inductance component (1), a resistance component (2) and a capacitance component (3) connected in series, and further comprising a matching circuit according to any of the claims 1 to 12 provided on a power supply terminal side (15) of the antenna body (11).