JPS58136102A - Microstrip line type diode phase shifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microstripline diode phase shifter.

FIG. 1 shows an example of a stripline diode phase shifter in a conventional microphone. This phase shifter branches and connects it and the second stub circuits 4 and 5 by changing the electrical angle of the main line 3 that connects the input/output terminal l and the terminal 2, and each stub circuit 4 , 5 each have a diode 6
．． 7 are connected in series with their anodes facing the main line 3114M, the ends of each stub circuit 4 and 5 are grounded, and the main line 3 is provided with a bias terminal 8. The phase shift angle of the phase constructor is - It is defined by the phase angle of the transmission coefficient from the terminal 1 to the terminal 2 when the valley diodes 6 and 7 are biased in the forward direction, and the phase angle of the transmission coefficient from the terminal 1 to the terminal 2 when the valley diodes 6 and 7 are biased in the reverse direction.

Incidentally, in such a diode phase shifter, the phase shift angle may deviate from a set value due to manufacturing problems such as irregularities in diode characteristics.

If a shift in the phase shift angle occurs, it is necessary to correct it to the set value. Conventionally, methods of correction have been used, such as (a) adding a correction circuit to the stub circuit, and (b) replacing the diode with a diode with a different junction capacitance.

However, this method of correction has the drawback that if the amount of correction is large, the correction cannot be made, and that replacing the diode increases the cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a microstripline diode phase shifter that can easily correct errors in phase shift angle from a set value.

In the microstrip line diode phase shifter according to the present invention, capacitors each having a capacitance for correcting a phase shift angle setting value error are connected in series to a plurality of stub circuits, and the phase shift angle setting value error is corrected. t% mold.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIG. As shown in the figure, in the microstrip line diode phase shifter of this embodiment, f@1 and second stub circuits 4 and 5 are connected to main line /3 connecting terminal 1 and terminal 2 by an electrical angle of θ. The branch is connected. A diode 6.7 is connected in series to each stub circuit 4.5 with its cathode directed toward the main line 3.

The anode side of each diode 6.7 is grounded via capacitors 9 and 10 for correcting a set value error of the phase shift angle.

A bias circuit 8 is connected to the connection point between the diode 6 and the capacitor 9 and the connection point between the diode 7 and the capacitor 1o, and such a diode phase shifter is connected so that each diode 6 and 7 can be biased. In the case of capacitor 9. Increasing the capacitance of lO can increase the phase shift angle, and decreasing the capacitance can decrease the phase shift angle. Therefore, by connecting a capacitor 9 or 10t having a capacitance capable of correcting the error from the phase shift angle setting value, it is possible to correct the phase shift angle setting value error caused by manufacturing. In FIG. 3, when Lit of the capacitor is changed from 150 pF to 22 pF, the phase shift angle becomes smaller by about 2 degrees.

In this case, the phase shift angle to be set is 45@.

Note that the number of stub circuits is not limited to two, and the present invention is similarly applicable to circuits having two or more stub circuits.

In addition, in the above embodiment, nine cases were shown in which Honjitsu #4 was applied to the low anode line shop, but this is true.

As explained above, the microstripes according to the present invention! In the diode phase shifter, a capacitor with a capacitance for correcting phase shift angle set value errors is connected to the stub circuit, making it easy to correct phase shift angle set value errors that occur during manufacturing. It's cloudy. Furthermore, since the correction is performed by adding a capacitor, the correction can be performed at low cost.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional diode phase shifter, and FIG. 2 is a circuit diagram showing an example of a diode phase shifter according to the present invention.
FIG. 3 is a diagram showing a state in which phase shift angles differ due to differences in capacitance values of capacitors.

Claims (1)

[Claims] In a microstrip line diode phase shifter equipped with a plurality of stub circuits having series-connected diodes, the percentage value indicates that a capacitor having a capacitance to correct the construction value error of the phase shift angle is connected in series to each of the stub circuits. Microstrip line type diode phase shifter.