Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
An antenna apparatus including: an antenna terminal, a signal input terminal, a receiving terminal, and first and second microwave switch circuits, each of said first and second microwave switch circuits having an identical switch circuit characteristic impedance and comprising: an input terminal, an output terminal, a first impedance conversion circuit having an input, an output, and a first matching characteristic impedance less than the switch circuit characteristic impedance, the input of said first impedance conversion circuit being connected to said input terminal, a switching circuit connected to the output of said first impedance conversion circuit and to ground and comprising a field effect transistor and an inductor connected in parallel, and a second impedance conversion circuit having an input, an output, and a second matching characteristic impedance less than the switch circuit characteristic impedance, the input of said second impedance conversion circuit being connected to the output of said first impedance conversion circuit and the output of said second impedance conversion circuit being connected to said output terminal, wherein said first microwave switch circuit is connected to said antenna terminal and to said signal input terminal, said second microwave switch circuit is connected to said antenna terminal and to said receiving terminal, and the first and second matching characteristic impedances are equal.
Claim 2
Dependent Claim
212 words
An antenna apparatus including: an antenna terminal, a signal input terminal, a receiving terminal, and first and second microwave switch circuits, each of said first and second microwave switch circuits having an identical switch circuit characteristic impedance and comprising: an input terminal, an output terminal, a first impedance conversion circuit having an input, an output, and a first matching characteristic impedance less than the switch circuit characteristic impedance, the input of said first impedance conversion circuit being connected to said input terminal, a switching circuit connected to the output of said first impedance conversion circuit and to ground and comprising a field effect transistor and an inductor connected in parallel, and a second impedance conversion circuit having an input, an output, and a second matching characteristic impedance less than the switch circuit characteristic impedance, the input of said second impedance conversion circuit being connected to the output of said first impedance conversion circuit and the output of said second impedance conversion circuit being connected to said output terminal, wherein said first microwave switch circuit is connected to said antenna terminal and to said signal input terminal, said second microwave switch circuit is connected to said antenna terminal and to said receiving terminal, and the first and second matching characteristic impedances are equal.
Claim 3
Dependent Claim
15 words
The antenna apparatus of claim 1 wherein the switch circuit characteristic impedance is 50 Ω.
Claim 4
Dependent Claim
22 words
The antenna apparatus of claim 1 wherein each of said first and second impedance conversion circuits comprises a one-fourth wavelength transmission line.
Claim 5
Dependent Claim
20 words
The antenna apparatus of claim 1, wherein each of said first and second impedance conversion circuits comprises a coplanar line.