Phase shifter having switchable signal paths where one signal path includes no shunt capacitor and inductor

1. A phase shifter comprising:

a first signal path in which a first unit is disposed to advance a phase of a signal;

a second signal path in which a second unit with no shunt capacitor and no inductor is disposed to change the phase of the signal such that the changed phase is delayed; and

a switch section configured to switch between said first signal path and said second signal path.

2. The phase shifter according to claim 1 , wherein said first unit comprises a filter.

3. The phase shifter according to claim 2 , wherein said filter is a high pass filter.

4. The phase shifter according to claim 3 , wherein said high pass filter comprises:

first and second capacitances connected in series; and

an inductance connected from a node between said first and second capacitances to a ground.

5. The phase shifter according to claim 3 , wherein said high pass filter comprises:

a capacitance disposed in said first signal path; and

first and second inductances connected from ends of said capacitance to a ground, respectively.

6. The phase shifter according to claim 1 , wherein said switch section comprises:

a first switch section connected to an input terminal and said first and second signal paths; and

a second switch section connected to an output terminal and said first and second signal paths.

7. The phase shifter according to claim 6 , wherein each of said first and second switch sections comprises a single pole double throw (SPDT) switch.

8. A phase shifter comprising:

a first signal path in which a first unit is disposed to advance a phase of a signal;

a second signal path in which a second unit with no shunt capacitor is disposed to change the phase of the signal such that the changed phase is delayed; and

a switch section configured to switch between said first signal path and said second signal path,

wherein said second unit comprises a transmission line.

9. The phase shifter according to claim 8 , wherein said transmission line is a microstrip line.

10. The phase shifter according to claim 8 , wherein said second unit further comprises the transmission line with an open stub.

11. A phase shifter comprising:

a first signal path in which a first unit is disposed to advance a phase of a signal;

a second signal path in which a second unit with no shunt capacitor is disposed to change the phase of the signal such that the changed phase is delayed; and

a switch section configured to switch between said first signal path and said second signal path,

wherein the delay of the changed phase is a function of length of the second signal path.

12. A bit phase shifter comprising a plurality of phase shifters, wherein one of said phase shifters comprises:

a first signal path in which a first unit is disposed to advance a phase of a signal;

a second signal path in which a second unit with no shunt capacitor is disposed to change the phase of the signal such that the changed phase is delayed than the advanced phase by said first unit; and

a switch section configured to switch between said first signal path and said second signal path, and

wherein said second unit comprises a microstrip transmission line.

13. A bit phase shifter comprising a plurality of phase shifters, wherein one of said phase shifters comprises:

a first signal path in which a first unit is disposed to advance a phase of a signal; a second signal path in which a second unit with no shunt capacitor and no inductor is disposed to change the phase of the signal such that the changed phase is delayed; and a switch section configured to switch between said first signal path and said second signal path.

14. The phase shifter according to claim 13 , wherein said first unit comprises a high pass filter.