Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
230 words
A 90 phase shifter, comprising: a first and a second single pole double throw switch (50, 51) which receives an input signal input to an input terminal and outputs said signal to either of two output terminals, or receives two signals respectively input to said two output terminals and outputs either of said two input signals to said input terminal; a reference transmission line (15a, 15b) having an electrical length of a, connected between ones of said two terminals of said first and second single pole double throw switches (50, 51); a phase difference producing transmission line (14) having an electrical length of (90 ° + a) in the usage frequency, connected between the others of said two terminals of said first and said second single pole double throw switches (50, 51); a phase inverting circuit (16) provided switchably by a state switching switch (3) between a state of being inserted serially to and between two parts of said reference transmission line (15a, 15b), which two parts produce the entirety of said reference transmission line (15) and a state of not being inserted serially thereto and therebetween; and one terminal of said first single pole double throw switch (50) being an input terminal (1) of the entire phase shifter and one terminal of said second single pole double throw switch (51) being an output terminal of the entire phase shifter.
Claim 2
Dependent Claim
230 words
A 90 phase shifter, comprising: a first and a second single pole double throw switch (50, 51) which receives an input signal input to an input terminal and outputs said signal to either of two output terminals, or receives two signals respectively input to said two output terminals and outputs either of said two input signals to said input terminal; a reference transmission line (15a, 15b) having an electrical length of a, connected between ones of said two terminals of said first and second single pole double throw switches (50, 51); a phase difference producing transmission line (14) having an electrical length of (90 ° + a) in the usage frequency, connected between the others of said two terminals of said first and said second single pole double throw switches (50, 51); a phase inverting circuit (16) provided switchably by a state switching switch (3) between a state of being inserted serially to and between two parts of said reference transmission line (15a, 15b), which two parts produce the entirety of said reference transmission line (15) and a state of not being inserted serially thereto and therebetween; and one terminal of said first single pole double throw switch (50) being an input terminal (1) of the entire phase shifter and one terminal of said second single pole double throw switch (51) being an output terminal of the entire phase shifter.
Claim 3
Dependent Claim
83 words
The 90 ° phase shifter of claim 1, wherein said phase inverting circuit includes a resonance circuit which, comprising an FET (3) and a resonance line (4), is inserted between said reference transmission line (15) at a position of one-second of the entire electrical length of said reference transmission line (15) from its one end and constitutes said state switching switch; and a half-wavelength line (16)having an electrical length of 180 ° in the usage frequency, connected in parallel with said resonance circuit.
Claim 4
Dependent Claim
21 words
The 90 ° phase shifter of claim 1, wherein said phase inverting circuit comprises a reflector type 180 phase shifter (20).
Claim 5
Dependent Claim
27 words
The 90 ° phase shifter of claim 3, wherein said reflector type 180 phase shifter (20) comprises a 3 dB directional coupler (19) using a Lange coupler.
Claim 6
Dependent Claim
24 words
The 90 ° phase shifter of claim 3, wherein said reflector type phase shifter comprises a 3 dB directional coupler of branch line type.