CN210007681U

CN210007681U - digital phase shifters

Info

Publication number: CN210007681U
Application number: CN201920789362.1U
Authority: CN
Inventors: 唐聪; 潘晓枫; 张坤; 杨清愉; 胡远圣
Original assignee: Clp Guoji Nanfang Group Co Ltd
Current assignee: Clp Guoji Nanfang Group Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2020-01-31
Anticipated expiration: 2029-05-29

Abstract

The utility model relates to a digital phase shifter, 180 shift phase unit circuit and 90 shift phase unit circuit and set up in both ends, as digital phase shifter's input and output respectively, 45 shift phase unit circuit and 180 shift phase unit circuit link to each other, 22.5 shift phase unit circuit and 90 shift phase unit circuit link to each other, 45 shift phase unit circuit, 11.25 shift phase unit circuit, 5.625 shift phase unit circuit and 22.5 shift phase unit circuit cascade in proper order, 180 shift phase unit circuit, 90 shift phase unit circuit and 45 shift phase unit circuit are three high-order unit, and 180 shift phase unit circuit and 90 shift phase unit circuit adopt the network that the all-through network combined together with the high pass network, 45 shift phase unit circuit adopts the network that the all-through network combined with the low pass network.

Description

digital phase shifters

Technical Field

The utility model relates to a Microwave Monolithic Integrated Circuit (MMIC) field especially relates to digital phase shifter field.

Background

The application of the phased array technology in wireless communication and radar is increasing , which attracts the attention of many scholars at home and abroad and becomes a hotspot of research in the field.

The phase shifter can be generally divided into an analog type and a digital type according to whether the phase can be continuously adjusted or not, and the digital type is widely applied to the phased array radar by due to the advantages of stable operation, no influence of external environment and the like.

The conventional transmission line Filter has a narrow working Bandwidth, and in order to expand the Bandwidth, a plurality of High Pass Filters (HPFs) and Low Pass Filters (LPFs) can be cascaded, but this increases the circuit area and is not beneficial to miniaturization of the circuit, patent [ CN 2015067929 ] and documents [ "k.miyaguchi, m.high, k.nakaharan, etc., Ultra-wide-Band Reflection-Type Phase-shift MMIC Networks and Parallel LC Circuits, IEEE trans-active Networks micro wave and communication, volume.49, No.12, digital signal 2001" ] All adopt a Reflection Type structure which can expand the Bandwidth, but the area of the Phase Shifter is relatively Large, and the application of the Phase Shifter in broadband Circuits is particularly disadvantageous to miniaturization documents [ Xinyi, tail, Phase, signal 2001 "] has a relatively Large value and is not beneficial to the application of the Phase Shifter in IEEE transmission line filters, especially to miniaturization Circuits, and the field shift Circuits, and also has a relatively Large practical value for the field coupler of the circuit, which is not beneficial to miniaturization of IEEE 6332.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an digital phase shifter adopts the network that leads to network and high low pass network combination completely through the high-order unit, has realized the bandwidth of broad, compact structure simultaneously.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

digital phase shifter, including 180 degree phase shift unit circuit, 90 degree phase shift unit circuit, 45 degree phase shift unit circuit, 22.5 degree phase shift unit circuit, 11.25 degree phase shift unit circuit and 5.625 degree phase shift unit circuit, 180 degree phase shift unit circuit and 90 degree phase shift unit circuit are set at two ends, respectively as the input end and output end of digital phase shifter, 45 degree phase shift unit circuit is connected with 180 degree phase shift unit circuit, 22.5 degree phase shift unit circuit is connected with 90 degree phase shift unit circuit, 45 degree phase shift unit circuit, 11.25 degree phase shift unit circuit, 5.625 degree phase shift unit circuit and 22.5 degree phase shift unit circuit are cascaded in turn, 180 degree phase shift unit circuit, 90 degree phase shift unit circuit and 45 degree phase shift unit circuit are three high-bit units, 180 degree phase shift unit circuit and 90 degree phase shift unit circuit adopt the network of full-pass network and high-pass network, 45 degree phase shift unit circuit adopts the network and low-pass network, digital phase shifter uses 5.625 degree phase shift as the step value, realize the total phase shift state in 0 ~ 64 degree phase shift range.

The 180-degree phase shift unit circuit and the 90-degree phase shift unit circuit adopt the same topological structure and comprise single-pole double-throw switch SW1, a second single-pole double-throw switch SW2, a high-pass filter HPF, wherein the end of the high-pass filter HPF is connected with the end of the single-pole double-throw switch SW1, the second end of the high-pass filter HPF is connected with the end of the second single-pole double-throw switch SW2, an all-pass network APN1, the end of the all-pass network APN1 is connected with the second end of the single-pole double-throw switch SW1, and the second end of the all-pass network APN1 is connected with the second end of the second single-pole double-throw switch SW 2.

The high-pass filter HPF adopts a T-shaped structure, a th end of an th capacitor C1 is connected with a th end of a single-pole double-throw switch SW1, a second end of an th capacitor C1 is connected with an th end of a second capacitor C2 and a th end of a th inductance coil L1, a second end of an L1 th inductance coil is grounded, and a second end of a second capacitor C2 is connected with a th end of a second single-pole double-throw switch SW 2.

The all-pass network APN1 is of a series capacitance type and comprises a second inductance coil L2 and a third inductance coil L3 which are coupled with each other, a third capacitor C3 is connected between the upper end ports of the second inductance coil L2 and the third inductance coil L3 in a crossing mode, the lower end ports of the second inductance coil L2 and the third inductance coil L3 are connected with the end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is grounded.

The two equivalent second inductance coils L2 and the third inductance coil L3 are mutually wound to reduce the area of a circuit, and the function of shifting the phase by 180 degrees or 90 degrees is realized by selecting a proper inductance coil value, capacitance value and mutual inductance K1 value and switching between two channels of an all-pass network APN1 and a high-pass filter HPF through a switch.

The 45 DEG phase shift unit circuit includes: a third single pole double throw switch SW 3; a fourth single pole double throw switch SW 4;

a second all-pass network APN2, wherein the second end of the second all-pass network APN2 is connected with the second end of the third single-pole double-throw switch SW3, and the second end of the second all-pass network APN2 is connected with the second end of the fourth single-pole double-throw switch SW 4;

the low pass filter LPF has a T-shaped structure, a end of a fourth inductor L4 is connected to a end of a third single-pole double-throw switch SW3, a second end of the fourth inductor L4 is connected to a end of a fifth inductor L5 and a end of a fifth capacitor C5, a second end of a fifth capacitor C5 is grounded, and a second end of the fifth inductor L5 is connected to a end of a fourth single-pole double-throw switch SW 4.

The second all-pass network APN2 is of a series capacitance type and comprises a sixth inductor L6 and a seventh inductor L7 which are coupled with each other, a sixth capacitor C6 is connected between the upper end ports of the sixth inductor L6 and the seventh inductor L7 in a crossing mode, the lower end ports of the sixth inductor L6 and the seventh inductor L7 are connected with the end of the seventh capacitor C7, and the second end of the seventh capacitor C7 is grounded.

And selecting proper inductance, capacitance and mutual inductance K2 values, and switching between two channels of an all-pass network APN2 and a low-pass filter LPF through a switch to realize the function of shifting the phase by 45 degrees.

The 22.5 ° phase shift unit circuit comprises a T-type phase shift network and a phase compensation unit, the T-type phase shift network comprises an eighth inductor L8, a ninth inductor L9, an eighth capacitor C8 and a tenth inductor L10, the eighth inductor L8 and the ninth inductor L9 are equivalent series inductors, the eighth capacitor C8 is a resonant capacitor, the tenth inductor L10 is a resonant inductor, the terminal of the tenth inductor L10 is connected in series with the terminal of the eighth capacitor C8, the second terminal of the tenth inductor L10 is grounded, the second terminal of the eighth capacitor C8 is connected in parallel between the eighth inductor L8 and the ninth inductor L8, the fifth control switch SW8 is connected in parallel with the eighth inductor L8 and the ninth inductor L8 which are connected in series, the sixth control switch SW 72 is connected in parallel with the two terminals of the eighth capacitor C8, the seventh control switch SW 72 is connected in parallel with the eighth inductor L8 and the ninth inductor L8, the seventh switch SW 72, the seventh control SW 72 is connected in parallel with the eighth inductor SW 72, the ninth switch SW 72, the seventh switch SW 72 and the ninth switch SW8, the seventh switch SW are connected with the eighth switch SW8, the ninth switch SW 72, the seventh switch SW is connected SW 72 and the ninth switch SW8, the ninth switch SW 72, the ninth switch SW control signal control unit is connected SW 72, the ninth switch SW is connected SW8, the ninth switch SW 72 and the ninth switch SW 72, the ninth switch SW control unit circuit is connected SW 72, the ninth switch SW 72 and the ninth switch SW 72 are connected SW 72, the ninth switch SW 72, the seventh switch SW 72 are connected SW 72, the ninth switch SW 72, the eighth switch SW 72, the ninth switch.

When the fifth control switch SW5 and the sixth control switch SW6 are opened, and the seventh control switch SW7 and the eighth control switch SW8 are closed, the 22.5 DEG phase shift unit is equivalent to small resistors and the ninth capacitor C9 in series, other circuits are short-circuited, the fifth control switch SW5 and the sixth control switch SW6 are closed, when the seventh control switch SW7 and the eighth control switch SW8 are opened, the phase shift circuit is equivalent to T-shaped networks which comprise two eight inductance coils L8 and a ninth inductance coil L9 in series, the ends of the eighth capacitor C8 and the tenth inductance coil L10 are grounded, the other inductance end is connected between the eighth inductance coil L8 and the ninth inductance coil L9 in parallel, and the phase compensation capacitor is short-circuited 9.

Proper inductance and capacitance values are selected, and the on and off of the two groups of switches are realized through different control levels, so that signals are switched in two channels, and the function of shifting the phase by 22.5 degrees is realized.

The 11.25-degree phase-shifting unit circuit comprises a T-shaped phase-shifting network with the same structure as the 22.5-degree phase-shifting unit circuit, and the difference is that the 11.25-degree phase-shifting unit circuit does not have a phase compensation network.

Proper inductance and capacitance values are selected, and the on and off of the two groups of switches are realized through different control levels, so that signals are switched in two channels, and the function of phase shift of 11.25 degrees is realized.

The 5.625 DEG phase shift unit circuit comprises a ninth control switch SW9, a tenth control switch SW10, a tenth capacitor C10, a tenth capacitor C11, a tenth capacitor C10 which is a phase shift capacitor, a tenth capacitor C11 which is a phase compensation capacitor, a tenth capacitor C10 which is connected in parallel with the ninth control switch SW9 and then connected in series with the end of the tenth control switch SW10, a second end of the tenth control switch SW10 which is connected in series with the end of the tenth capacitor C11, a second end of the tenth capacitor C11 which is grounded, the ninth control switch SW9 and the tenth control switch SW10 are controlled by external power-up, and the ninth control switch SW9 and the tenth control switch SW10 are controlled by the same control signal.

The phase shift circuit is equivalent to small resistors connected in series with branches connected in parallel to ground including the small resistors and the tenth capacitor C11 when the ninth control switch SW9 and the tenth control switch SW10 are turned on, and the phase shift network is equivalent to the tenth capacitor C10 when the ninth control switch SW9 and the tenth control switch SW10 are turned off.

Advantageous effects

The 180-degree phase-shifting unit circuit, the 45-degree phase-shifting unit circuit, the 11.25-degree phase-shifting unit circuit, the 5.625-degree phase-shifting unit circuit, the 22.5-degree phase-shifting unit circuit and the 90-degree phase-shifting unit circuit are sequentially cascaded, and by adopting the structure, the traction of the high-displacement phase unit on the low-displacement phase unit can be reduced, the interstage matching degree is improved, and the phase-shifting precision is improved.

The high-displacement phase shifter unit of the digital phase shifter adopts a mode of combining an all-pass network and a high-low-pass network, and compared with the phase shifter realized by adopting the high-low-pass network, the phase shifter has the advantages of compact structure, small occupied area and wide working frequency band. The work relative bandwidth of the traditional phase shifter is about 30%, and the work bandwidth of the phase shifter of the utility model reaches 60%.

Compare with the little bit cell phase shift circuit who adopts high low pass network to realize, the utility model provides a little bit cell phase shift unit has simple structure, easily integrates, and area occupied is little advantage.

The whole phase shifter has small insertion loss and high phase shifting precision. The utility model discloses a move the biggest insertion loss of looks ware and be less than 6dB, return loss is greater than 15dB, moves the phase precision and is less than 5.

Drawings

The present invention will be further described in with reference to the following drawings and examples.

Fig. 1 is a schematic block diagram of the present invention.

Fig. 2 is a schematic circuit diagram of the 180 ° phase shift unit circuit and the 90 ° phase shift unit circuit of the present invention.

Fig. 3 is a schematic circuit diagram of a 45 ° phase shift unit circuit according to the present invention.

Fig. 4 is a schematic circuit diagram of a 22.5 ° phase shift unit circuit according to the present invention.

Fig. 5 is a schematic circuit diagram of a 5.625 ° phase shift unit circuit according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below in with reference to the following embodiments.

Example (b):

as shown in FIG. 1, digital phase shifters include a 180 ° phase shift unit circuit, a 90 ° phase shift unit circuit, a 45 ° phase shift unit circuit, a 22.5 ° phase shift unit circuit, an 11.25 ° phase shift unit circuit and a 5.625 ° phase shift unit circuit, wherein the 180 ° phase shift unit circuit and the 90 ° phase shift unit circuit are disposed at two ends and respectively used as an input end and an output end of the digital phase shifter, the 45 ° phase shift unit circuit is connected with the 180 ° phase shift unit circuit, the 22.5 ° phase shift unit circuit is connected with the 90 ° phase shift unit circuit, the 45 ° phase shift unit circuit, the 11.25 ° phase shift unit circuit, the 5.625 ° phase shift unit circuit and the 22.5 ° phase shift unit circuit are sequentially cascaded, the 180 ° phase shift unit circuit, the 90 ° phase shift unit circuit and the 45 ° phase shift unit circuit are three high-height phase shift unit circuits, the 180 ° phase shift unit circuit and the 90 ° phase shift unit circuit are a network combining an all-pass network, the 45 ° phase shift unit circuit uses an all-pass network combining an all-pass network, the 45 ° phase shift unit circuit uses a 5.625 ° phase shift.

In this embodiment, the switch uses GaAs pHEMT type GaAs pseudomodulation doped heterojunction field effect transistor, which is equivalent to very small resistors when turned on and very small capacitors when turned off.

As shown in FIG. 2, the 180 DEG phase shift unit circuit and the 90 DEG phase shift unit circuit adopt the same topology structure, and comprise single-pole double-throw switch SW1, a second single-pole double-throw switch SW2, a high-pass filter HPF, wherein the end of the high-pass filter HPF is connected with the end of the single-pole double-throw switch SW1, the second end of the high-pass filter HPF is connected with the end of the second single-pole double-throw switch SW2, a full-pass network APN1, the end of the full-pass network APN1 is connected with the second end of the single-pole double-throw switch SW1, the second end of the full-pass network APN1 is connected with the second end of the second single-pole double-throw switch SW2, the single-pole double-throw switch SW1 serves as an input end, and the second single-pole double-throw switch SW2 serves as an.

When the single-pole double-throw switch SW1 and the second single-pole double-throw switch SW2 point to the upper half branch at the same time, the HPF is conducted, the phase is positive, and can be used as the ground state, when the single-pole double-throw switch SW1 and the second single-pole double-throw switch SW2 point to the lower half branch at the same time, the APN1 of the all-pass network is conducted, the phase is negative, and can be used as the phase-shifting state, and the ground state is subtracted from the phase-shifting state, so that a large phase-shifting phase can be realized.

The two equivalent second inductance coils L2 and the third inductance coil L3 are mutually wound to reduce the area of a circuit, a proper inductance coil value, a proper capacitance value and a proper mutual inductance K1 value are selected, and the two channels of the all-pass network APN1 and the high-pass filter HPF are switched through a switch, so that the function of shifting the phase by 180 degrees or 90 degrees is realized, and meanwhile, smaller insertion loss and good return loss can be obtained. In the range of 0.38-0.72GHz, with the structure, the insertion loss is less than 1.5dB, and the return loss is more than 18 dB.

As shown in FIG. 3, the 45 DEG phase shift unit circuit comprises a third single-pole double-throw switch SW3, a fourth single-pole double-throw switch SW4, a low-pass filter LPF, a second full-pass network APN2, a second full-pass network APN2, a second full-pass network APN2 and a second end of a fourth single-pole double-throw switch SW4, wherein the end of the low-pass filter LPF is connected with the end of the third single-pole double-throw switch SW3, the second end of the low-pass filter LPF is connected with the end of the fourth single-pole double-throw switch SW 4;

the third single pole double throw switch SW3 is connected as an input terminal and the fourth single pole double throw switch SW4 is connected as an output terminal.

When the third single-pole double-throw switch SW3 and the fourth single-pole double-throw switch SW4 point to the upper side branch at the same time, the low pass filter LPF is turned on, the phase is negative, the phase shift amount of the circuit is small, and the circuit can be used as a ground state. When the third single-pole double-throw switch SW3 and the fourth single-pole double-throw switch SW4 are simultaneously directed to the lower half branch, the all-pass network APN2 is turned on, the phase is negative, the phase shift amount of the circuit is large, and the circuit can be used as a phase shift state. The phase-shifted state minus the ground state can achieve the desired 45 ° phase shift. Theoretically, the structure shown in fig. 2 can also realize 45 ° phase shift, but the capacitance in the high-pass network will be very large, so that the occupied circuit area is large, which is not favorable for miniaturization of the circuit. By adopting the topological structure shown in fig. 3, the required 45-degree phase shift is realized, and the size of the circuit can be considered. By adopting the phase shift structure of the utility model, when designing the circuit,

the method selects proper inductance value, capacitance value and mutual inductance K2 value, and switches between two channels of the all-pass network APN2 and the low-pass filter LPF through a switch to realize the function of phase shifting by 45 degrees, and can obtain smaller insertion loss and good return loss. In the range of 0.38-0.72GHz, with the structure, the insertion loss is less than 1.3dB, and the return loss is more than 18 dB.

As shown in fig. 4, the 22.5 ° phase shift unit circuit includes a T-type phase shift network and a phase compensation unit, the T-type phase shift network includes an eighth inductor L8, a ninth inductor L9, an eighth capacitor C8 and a tenth inductor L10, the eighth inductor L8 and the ninth inductor L9 are equivalent series inductors, the eighth capacitor C9 is a resonant capacitor, the tenth inductor L9 is a resonant inductor, the tenth inductor L9 has a fifth 9 terminal connected in series with the eighth 9 terminal of the eighth capacitor C9, the tenth inductor L9 has a second terminal grounded, the eighth capacitor C9 has a second terminal connected in parallel between the eighth inductor L9 and the ninth inductor L9, the fifth control switch 9 is connected in parallel with the two series-connected eighth inductor L9 and ninth inductor L9, the sixth control switch SW 72 is connected in parallel with the eighth inductor L9 and the ninth inductor L9, the seventh control SW 72, the seventh control SW is connected in parallel with the eighth inductor SW 72 and the ninth inductor SW 72 as a control signal input terminal, the eighth switch SW 72, the eighth switch SW is connected with the ninth switch SW 72, the eighth switch SW 72 and the seventh switch SW 72, the eighth switch SW 72, the seventh switch SW is connected SW 72, the ninth switch SW control switch SW 72, the eighth switch SW control SW is connected SW 72, the ninth switch SW control switch SW 72, the ninth switch SW 72, the eighth switch SW control switch SW 72 and the ninth switch SW control switch SW 72, the ninth switch SW is connected SW control switch SW control unit 9, the ninth switch SW 72 is connected SW 72, the ninth switch SW control unit 9, the ninth switch SW 72, the eighth switch SW 72 is connected SW 72, the ninth switch SW 72 is connected SW control switch SW 72, the ninth switch SW 72, the eighth switch SW control unit SW 72 is connected SW 72, the ninth switch SW 72, the eighth switch SW 72, the ninth switch SW control unit is connected SW 72, the ninth switch SW control unit is connected.

When the fifth control switch SW5 and the sixth control switch SW6 are switched on and the seventh control switch SW7 and the eighth control switch SW8 are switched off, the T-shaped phase shift network is short-circuited, the whole unit circuit is equivalent to small resistors connected in series with the ninth capacitor C9, the phase shift amount is small, and the unit circuit can be used as a ground state.

As shown in fig. 5, the 11.25 ° phase shift unit circuit includes a T-type phase shift network having the same structure as the 22.5 ° phase shift unit circuit, except that the 11.25 ° phase shift unit circuit does not have a phase compensation network.

The 5.625 ° phase shift unit circuit includes a ninth control switch SW9, a tenth control switch SW10, a tenth capacitor C10, a tenth capacitor C11, a tenth capacitor C10 is a phase shift capacitor, a tenth capacitor C11 is a phase compensation capacitor, a tenth capacitor C10 is connected in parallel with the ninth control switch SW9 and then connected in series with the end of the tenth control switch SW10, a second end of the tenth control switch SW10 is connected in series with the end of the tenth capacitor C11, a second end of the tenth capacitor C11 is grounded, the ninth control switch SW9 and the tenth control switch SW10 are controlled by external power, the ninth control switch SW9 and the tenth control switch SW10 are controlled by the same control signal, a connection end of the ninth control switch SW9 and the tenth capacitor C10 serves as an input end, and a connection end of the ninth control switch SW9 and the tenth control switch SW10 serves as an output end.

When the ninth control switch SW9 and the tenth control switch SW10 are turned off, the circuit is equivalent to series capacitors, the phase is positive, and can be used as a ground state, when the ninth control switch SW9 and the tenth control switch SW10 are turned on, the circuit is equivalent to an inverted L-shaped circuit formed by connecting series small resistors in parallel with capacitors, the phase shift quantity is negative, and can be used as a phase shift state, and the two states realize the function of shifting the phase by 5.625 degrees through switching.

By adopting the digital phase shifter of the embodiment, the return loss is more than 15dB within the range of 0.38-0.72GHz (the relative bandwidth is 61.8%), the insertion loss of the whole circuit is less than 6dB, the phase shifting precision is less than 5 degrees, and the index is obviously superior to that of the phase shifter adopting the traditional high-low pass structure.

The above is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

The digital phase shifter comprises a 180-degree phase shift unit circuit, a 90-degree phase shift unit circuit, a 45-degree phase shift unit circuit, a 22.5-degree phase shift unit circuit, a 11.25-degree phase shift unit circuit and a 5.625-degree phase shift unit circuit, wherein the 180-degree phase shift unit circuit and the 90-degree phase shift unit circuit are arranged at two ends and respectively used as an input end and an output end of the digital phase shifter, the 45-degree phase shift unit circuit is connected with the 180-degree phase shift unit circuit, the 22.5-degree phase shift unit circuit is connected with the 90-degree phase shift unit circuit, the 45-degree phase shift unit circuit, the 11.25-degree phase shift unit circuit, the 5.625-degree phase shift unit circuit and the 22.5-degree phase shift unit circuit are sequentially cascaded, the 180-degree phase shift unit circuit, the 90-degree phase shift unit circuit and the 45-degree phase shift unit circuit are three high-level units, the 180-degree phase shift unit circuit and the 90-degree phase shift unit circuit adopt a network combining an all-pass network, and a.
2. The digital phase shifter of claim 1, wherein: the 180-degree phase shift unit circuit and the 90-degree phase shift unit circuit adopt the same topological structure and comprise the following components:

th SPDT switch (SW 1);

a second single pole double throw switch (SW 2);

a High Pass Filter (HPF) having an th terminal connected to the th terminal of the th SPDT (SW1), and a second terminal connected to the th terminal of the second SPDT (SW 2);

an all-pass network (APN1), wherein the th end of the all-pass network (APN1) is connected with the second end of the th single-pole double-throw switch (SW1), and the second end of the all-pass network (APN1) is connected with the second end of the second single-pole double-throw switch (SW 2).
3. The digital phase shifter as claimed in claim 2, wherein the High Pass Filter (HPF) has a T-type structure, the terminal of the th capacitor (C1) is connected to the terminal of the th single-pole double-throw switch (SW1), the second terminal of the th capacitor (C1) is connected to the terminal of the second capacitor (C2) and the terminal of the th inductor (L1), the second terminal of the th inductor (L1) is grounded, and the second terminal of the second capacitor (C2) is connected to the terminal of the second single-pole double-throw switch (SW 2).
4. The digital phase shifter as claimed in claim 2, wherein the all-pass network (APN1) is of a series capacitance type and includes a second inductor (L2) and a third inductor (L3) coupled to each other, a third capacitor (C3) is bridged between the upper end port of the second inductor (L2) and the upper end port of the third inductor (L3), the lower end port of the second inductor (L2) and the third inductor (L3) is connected to the end of the fourth capacitor (C4), and the second end of the fourth capacitor (C4) is grounded.
5. The digital phase shifter of claim 1, wherein: the 45 DEG phase shift unit circuit includes:

a third single pole double throw switch (SW 3);

a fourth single pole double throw switch (SW 4);

a Low Pass Filter (LPF), wherein the th end of the Low Pass Filter (LPF) is connected with the th end of the third single-pole double-throw switch (SW3), and the second end of the Low Pass Filter (LPF) is connected with the th end of the fourth single-pole double-throw switch (SW 4);

a second all-pass network (APN2), wherein a th end of the second all-pass network (APN2) is connected with a second end of the third single-pole double-throw switch (SW3), and a second end of the second all-pass network (APN2) is connected with a second end of the fourth single-pole double-throw switch (SW 4).
6. The digital phase shifter as claimed in claim 5, wherein the Low Pass Filter (LPF) has a T-shaped structure, the terminal of the fourth inductor (L4) is connected to the terminal of the third single-pole double-throw switch (SW3), the second terminal of the fourth inductor (L4) is connected to the terminal of the fifth inductor (L5) and the terminal of the fifth capacitor (C5), the second terminal of the fifth capacitor (C5) is grounded, and the second terminal of the fifth inductor (L5) is connected to the terminal of the fourth single-pole double-throw switch (SW 4).
7. The digital phase shifter as recited in claim 5, wherein said second all-pass network (APN2) is of a series capacitance type and comprises a sixth inductor (L6) and a seventh inductor (L7) coupled to each other, a sixth capacitor (C6) is connected across the sixth inductor (L6) and the seventh inductor (L7) between the upper ports, the sixth inductor (L6) and the seventh inductor (L7) are connected to the port of the seventh capacitor (C7) at the lower ports, and the second port of the seventh capacitor (C7) is grounded.
8. The digital phase shifter as claimed in claim 1, wherein said 22.5 ° phase shifting unit circuit comprises a T-type phase shifting network and a phase compensation unit, said T-type phase shifting network comprises an eighth inductor (L8), a ninth inductor (L8), an eighth capacitor (C8) and a tenth inductor (L8), said eighth inductor (L8) and said ninth inductor (L8) are two equivalent series inductors, said tenth inductor (L8) has a fifth 8 terminal connected in series with said eighth capacitor (C8) terminal, said tenth inductor (L8) has a second terminal connected to ground, said eighth capacitor (C8) has a second terminal connected in parallel between said eighth inductor (L8) and said ninth inductor (L8), said fifth control switch (SW8) is connected in parallel with said eighth inductor (L8) and said ninth inductor (L8), said sixth control Switch (SW) is connected in parallel with said ninth inductor (L8) and said ninth inductor (SW) control unit, said ninth inductor (L8) and said ninth inductor (SW) are connected in parallel with said ninth inductor (L8), said ninth inductor (L8) and said ninth inductor (SW) control Switch (SW) are connected in parallel, said ninth inductor (SW 72), said ninth inductor (SW) and said ninth inductor (SW) are connected in parallel, said ninth inductor (SW) control unit (8) and said ninth inductor (SW) control unit comprises a seventh Switch (SW) control Switch (SW) and a seventh Switch (SW) control Switch (SW) and a seventh Switch (SW) connected in parallel, said ninth inductor (SW) and a seventh Switch (SW) control switch (8) connected in parallel, said ninth Switch (SW) and a seventh Switch (SW) and a Switch (SW) connected in parallel, said ninth Switch (SW) control Switch (SW) and a switch (.
9. The digital phase shifter of claim 8, wherein: the 11.25-degree phase-shifting unit circuit comprises a T-shaped phase-shifting network with the same structure as the 22.5-degree phase-shifting unit circuit.
10. The digital phase shifter of claim 1, wherein: the 5.625 ° phase shift unit circuit includes:

a ninth control switch (SW 9);

a tenth control switch (SW 10);

a tenth capacitance (C10);

a tenth capacitance (C11);

the tenth capacitor (C10) is connected in parallel with the ninth control switch (SW9) and then connected in series with the th end of the tenth control switch (SW10), the second end of the tenth control switch (SW10) is connected in series with the th end of the tenth capacitor (C11), the second end of the tenth capacitor (C11) is grounded, and the ninth control switch (SW9) and the tenth control switch (SW10) are controlled by external power.