Balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider

Abstract

This invention belongs to the field of microwave radio frequency communication technology, specifically relating to a balanced to single-ended wide common-mode rejection non-reflection filter power divider. The invention includes a half-wavelength coupling line CL1, a first three-wire coupling line TCL1, a second three-wire coupler TCL2, an auxiliary resistor Re1, an "I"-shaped absorption-isolation composite structure, and a balanced input port P. 1+ / P 1‑ The first single-ended output port P2 and the second single-ended output port P3; the balanced input port P 1+ / P 1‑ The half-wavelength coupling line CL1 is connected to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2 respectively; the first three-wire coupling line TCL1 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure and the first single-ended output port P2 respectively; the second three-wire coupler TCL2 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure and the second single-ended output port P3 respectively.

Description

Technical Field

[0001] This invention belongs to the field of microwave radio frequency communication technology, specifically relating to a balanced to single-ended wide common-mode suppression non-reflection filter power divider. Background Technology

[0002] Balanced circuits effectively suppress environmental noise in radio frequency (RF) circuits and possess excellent electromagnetic interference (EMI) immunity, meeting the high-quality communication requirements of communication systems. Therefore, balanced microwave circuits have experienced rapid development in recent years. Furthermore, to meet the miniaturization and high integration demands of wireless communication systems, functionally integrated devices have also gained widespread attention. For example, filters and power dividers were originally two independent devices operating in the RF front-end system, used for filtering microwave signals and distributing power, respectively. To incorporate more functions within a limited system space, filters and power dividers are functionally integrated, improving component utilization and thus forming a filter-power divider. Combining balanced circuits with filter-power dividers to form a balanced filter-power divider not only provides strong EMI immunity but also meets the requirements of miniaturization and high integration. However, on the other hand, the stability of the communication system also affects communication quality. For instance, in the RF front-end system, nonlinear sensitive devices such as mixers and amplifiers are easily interfered with by reflected signals generated by filter devices, causing instability in the entire communication system. Adding an absorption circuit to the existing circuit effectively solves the interference problem caused by reflected signals. Its working principle is to introduce the reflected signal into the absorption circuit, where the resistors dissipate the reflected signal, thus preventing interference from the reflected signal to sensitive devices. If an absorption circuit is added to a balanced power divider to form a balanced, reflection-free power divider, the device not only meets the requirements of strong anti-interference capability but also features miniaturization and high integration, while ensuring the stable operation of the RF communication system.

[0003] Currently, existing balanced power dividers do not possess anti-reflection capabilities. Furthermore, common-mode rejection (CMOS) performance is a crucial indicator for evaluating the performance of balanced circuits. There are two main methods for achieving CMS in existing balanced power dividers. One is the traditional method, which involves adding a half-wavelength transmission line between the balanced ports. The differential-mode signal, after passing through the half-wavelength transmission line, is converted into a signal with the same phase. The common-mode signal, having the same phase, forms a 180° phase difference at both ends of the half-wavelength transmission line, thus canceling out the common-mode signal and suppressing it. The drawback of this method is its narrow CMS bandwidth, achieving good suppression only at the center frequency. The other method utilizes a slotted wire structure with a metal ground plane to achieve CMS. The principle is that differential-mode signals can be transmitted using the slotted wire structure, while common-mode signals cannot. This method significantly improves the CMS bandwidth compared to the traditional method, but the construction of the slotted wire increases the overall design complexity. Existing balanced power dividers do not yet have anti-reflection functionality, and also suffer from drawbacks such as narrow and ineffective common-mode rejection bandwidth, poor isolation performance, complex overall circuit structure, low utilization of circuit components, and large size.

[0004] Therefore, it is necessary to propose a new type of balanced filter power divider that, while achieving miniaturization and high integration, also possesses a wide common-mode rejection bandwidth and no reflection function, thus ensuring stability for high-quality communication. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems and proposes a balanced to single-ended wide common-mode suppression non-reflective filter power divider.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A balanced to single-ended wide common-mode rejection non-reflective filter power divider includes a half-wavelength coupling line CL1, a first three-wire coupling line TCL1, a second three-wire coupler TCL2, an auxiliary resistor Re1, an I-shaped absorption-isolation composite structure, and a balanced input port P. 1+ / P 1- The first single-ended output port P2 and the second single-ended output port P3; the balanced input port P 1+ / P 1-The half-wavelength coupling line CL1 is connected to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2. The first three-wire coupling line TCL1 is connected to the auxiliary resistor Re1, the I-shaped absorption-isolation composite structure and the first single-ended output port P2. The second three-wire coupler TCL2 is connected to the auxiliary resistor Re1, the I-shaped absorption-isolation composite structure and the second single-ended output port P3.

[0008] As a further preferred embodiment of the present invention, the half-wavelength coupling line CL1 includes a first coupling line CL1a and a second coupling line CL1b; the first three-wire coupling line TCL1 includes a third coupling line TCL1a, a fourth coupling line TCL1b, and a fifth coupling line TCL1c; the second three-wire coupler TCL2 includes a sixth coupling line TCL2a, a seventh coupling line TCL2b, and an eighth coupling line TCL2c; wherein, one end of the first coupling line CL1a is connected to the balanced input port P. 1+ The other end of the first coupling line CL1a is connected to the balanced input port P. 1- Connection; one end of the second coupling line CL1b is connected to the balanced input port P respectively. 1+ The first coupling line CL1a is connected at one end, and the second coupling line CL1b is connected at the other end to one end of the third coupling line TCL1a and one end of the sixth coupling line TCL2a respectively; the third coupling line TCL1a is connected at the other end to one end of the auxiliary resistor Re1; the sixth coupling line TCL2a is connected at the other end to the other end of the auxiliary resistor Re1; one end of the fourth coupling line TCL1b is open and the other end is short-circuited to ground; one end of the seventh coupling line TCL2b is open and the other end is short-circuited to ground; one end of the fifth coupling line TCL1c is connected to the first single-ended output port P2 and the other end is connected to the "I"-shaped absorption-isolation composite structure; one end of the eighth coupling line TCL2c is connected to the second single-ended output port P3 and the other end is connected to the "I"-shaped absorption-isolation composite structure.

[0009] As a further preferred embodiment of the present invention, the "I"-shaped absorption-isolation composite structure includes a first transmission line structure TL1 to a fourth transmission line structure TL4, a resistor Re2, a first grounding resistor Re3, and a second grounding resistor Re4; one end of the first transmission line structure TL1 is connected to the other end of the fifth coupling line TCL1c, and the other end of the first transmission line structure TL1 is connected to one end of the second transmission line structure TL2 and one end of the first grounding resistor Re3 respectively; the other end of the first grounding resistor Re3 is short-circuited to ground; the other end of the second transmission line structure TL2 is connected to one end of the resistor Re2; the other end of the resistor Re2 is connected to one end of the third transmission line structure TL3; the other end of the third transmission line structure TL3 is connected to one end of the fourth transmission line structure TL4 and one end of the second grounding resistor Re4 respectively; the other end of the second grounding resistor Re4 is short-circuited to ground; the other end of the fourth transmission line structure TL4 is connected to the other end of the eighth coupling line TCL2c.

[0010] Furthermore, as a preferred embodiment of the present invention, the microwave radio frequency signal originates from the balanced input port P. 1+ / P 1- Feed in when a pair of differential signals are fed from the balanced input port P 1+ / P 1- During feeding, from the balanced input port P 1- The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signals pass through the second coupling line CL1b and are then evenly distributed to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2, achieving signal division and filtering. Simultaneously, the signals pass through the auxiliary resistor Re1 and the I-shaped absorption-isolation composite structure, achieving reflection-free and isolation functions. Finally, the differential-mode signal is output through the first single-ended output port P2 and the second single-ended output port P3. When a pair of common-mode signals originate from the balanced input port P... 1+ / P 1- During feeding, from the balanced input port P 1- The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signal is canceled at one end of the first coupling line CL1a, achieving wideband common-mode suppression.

[0011] Furthermore, as a preferred embodiment of the present invention, the first transmission line structure TL1 to the fourth transmission line structure TL4 are all quarter-wavelength transmission lines.

[0012] The balanced-to-single-ended wide common-mode rejection non-reflection filter power divider of the present invention, compared with the prior art, has the following technical advantages:

[0013] (1) This invention utilizes an I-shaped absorption-isolation composite structure with absorption and isolation functions, as well as an auxiliary resistor Re1 with isolation function and adjustable absorption bandwidth, to achieve full-band non-reflection and full-band isolation functions at the output end, thereby improving the utilization rate of the circuit structure. The structure is simple, compact, and easy to integrate.

[0014] (2) The present invention proposes an "I"-shaped absorption-isolation composite structure, which has the functions of no reflection at the output end and isolation, effectively improving the utilization rate of circuit components, and has the characteristics of compact structure and easy integration.

[0015] (3) The present invention proposes a half-wavelength coupling line CL1, which has a wide common-mode rejection bandwidth, excellent common-mode rejection effect, simple structure, and effectively reduces design complexity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a balanced to single-ended wide common-mode rejection reflective filter power divider circuit according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the three-wire coupling line structure of the balanced to single-ended wide common-mode suppression reflection-free filter power divider according to an embodiment of the present invention;

[0018] Figure 3 The differential-mode transmission coefficient S of the balanced-to-single-ended wide common-mode rejection reflectionless filter power divider in this embodiment of the invention is... dd21 &S dd31 Differential input reflection coefficient S dd11 Differential mode output reflection coefficient S dd22 &S dd33 Schematic diagram;

[0019] Figure 4 The differential-mode isolation coefficient S of the balanced-to-single-ended wide common-mode rejection reflective filter power divider in this embodiment of the invention is... dd23 and common mode suppression S cc21 Schematic diagram;

[0020] Figure 5 This is a schematic diagram of a filter power divider circuit A without auxiliary resistor Re1 according to an embodiment of the present invention;

[0021] Figure 6 The filter power divider circuit A without auxiliary resistor Re1 in this embodiment of the invention and the output reflection coefficient S of the circuit of the present invention. dd22 &S dd33 Comparison diagram;

[0022] Figure 7 The isolation coefficient S between the filter power divider circuit A without auxiliary resistor Re1 in this embodiment of the invention and the circuit of the present invention. dd23Comparison diagram;

[0023] Figure 8 This is a schematic diagram of the filter power divider circuit B without the "I"-shaped absorption-isolation composite structure according to an embodiment of the present invention;

[0024] Figure 9 The circuit B without the "I"-shaped absorption-isolation composite structure in this embodiment of the invention and the output reflection coefficient S of the circuit of this invention. dd22 &S dd33 Comparison diagram;

[0025] Figure 10 The isolation coefficient S between the circuit B without the "I"-shaped absorption-isolation composite structure in this embodiment of the invention and the circuit of this invention. dd23 Comparison diagram;

[0026] The attached diagram is labeled as: 101 - "I"-shaped absorption-isolation composite structure. Detailed Implementation

[0027] The present invention will be further explained in detail below with reference to the accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the following examples are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1 As shown, a balanced to single-ended wide common-mode rejection non-reflective filter power divider includes a half-wavelength coupling line CL1, a first three-wire coupling line TCL1, a second three-wire coupler TCL2, an auxiliary resistor Re1, an "I"-shaped absorption-isolation composite structure 101, and a balanced input port P. 1+ / P 1- The first single-ended output port P2 and the second single-ended output port P3; the balanced input port P 1+ / P 1- The half-wavelength coupling line CL1 is connected to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2 respectively; the first three-wire coupling line TCL1 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure 101 and the first single-ended output port P2 respectively; the second three-wire coupler TCL2 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure 101 and the second single-ended output port P3 respectively.

[0029] The half-wavelength coupling line CL1 includes a first coupling line CL1a and a second coupling line CL1b; the first three-wire coupling line TCL1 includes a third coupling line TCL1a, a fourth coupling line TCL1b, and a fifth coupling line TCL1c; the second three-wire coupler TCL2 includes a sixth coupling line TCL2a, a seventh coupling line TCL2b, and an eighth coupling line TCL2c; wherein, one end of the first coupling line CL1a is connected to the balanced input port P. 1+ The other end of the first coupling line CL1a is connected to the balanced input port P. 1- Connection; one end of the second coupling line CL1b is connected to the balanced input port P respectively. 1+ One end of the first coupling line CL1a is connected to the second coupling line CL1b, and the other end of the second coupling line CL1b is connected to one end of the third coupling line TCL1a and one end of the sixth coupling line TCL2a respectively; the other end of the third coupling line TCL1a is connected to one end of the auxiliary resistor Re1; the other end of the sixth coupling line TCL2a is connected to the other end of the auxiliary resistor Re1; one end of the fourth coupling line TCL1b is open, and the other end is short-circuited to ground; one end of the seventh coupling line TCL2b is open, and the other end is short-circuited to ground; one end of the fifth coupling line TCL1c is connected to the first single-ended output port P2, and the other end is connected to the "I"-shaped absorption-isolation composite structure 101; one end of the eighth coupling line TCL2c is connected to the second single-ended output port P3, and the other end is connected to the "I"-shaped absorption-isolation composite structure 101.

[0030] The "I"-shaped absorption-isolation composite structure 101 includes a first transmission line structure TL1 to a fourth transmission line structure TL4, a resistor Re2, a first grounding resistor Re3, and a second grounding resistor Re4. One end of the first transmission line structure TL1 is connected to the other end of the fifth coupling line TCL1c, and the other end of the first transmission line structure TL1 is connected to one end of the second transmission line structure TL2 and one end of the first grounding resistor Re3, respectively. The other end of the first grounding resistor Re3 is short-circuited to ground. The other end of the second transmission line structure TL2 is connected to one end of the resistor Re2. The other end of the resistor Re2 is connected to one end of the third transmission line structure TL3. The other end of the third transmission line structure TL3 is connected to one end of the fourth transmission line structure TL4 and one end of the second grounding resistor Re4, respectively. The other end of the second grounding resistor Re4 is short-circuited to ground. The other end of the fourth transmission line structure TL4 is connected to the other end of the eighth coupling line TCL2c. The first transmission line structure TL1 to the fourth transmission line structure TL4 are all quarter-wavelength transmission lines.

[0031] Microwave radio frequency signals from balanced input port P 1+ / P 1- Feed in when a pair of differential signals are fed from the balanced input port P 1+ / P 1- During feeding, from the balanced input port P 1-The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signals pass through the second coupling line CL1b and are then evenly distributed to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2, achieving signal division and filtering. Simultaneously, the signals pass through the auxiliary resistor Re1 and the I-shaped absorption-isolation composite structure 101, achieving reflection-free and isolation functions. Finally, the differential-mode signal is output through the first single-ended output port P2 and the second single-ended output port P3. When a pair of common-mode signals originate from the balanced input port P... 1+ / P 1- During feeding, from the balanced input port P 1- The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signal is canceled at one end of the first coupling line CL1a, achieving wideband common-mode suppression.

[0032] The half-wavelength coupling line CL1 provides wideband common-mode rejection. Specifically, when a differential-mode signal with a 180° phase difference is received from the balanced input port P... 1+ / P 1- During feeding, from the balanced input port P 1- The input signal undergoes a 180° phase shift after passing through the first coupling line CL1a, aligning with the signal from the balanced input port P. 1+ The input signals are of equal amplitude and in phase, and the differential-mode signals are transmitted together from the second coupling line CL1b; when the common-mode signal with a 0° phase difference is transmitted from the balanced input port P... 1+ / P 1- During feeding, from the balanced input port P 1- The input signal undergoes a 180° phase shift after passing through the first coupling line CL1a, aligning with the signal from the balanced input port P. 1+ The input signal generates a 180° phase difference, therefore, one end of the first coupling line CL1a becomes the point where the two signals cancel each other out, completing wideband common-mode suppression. The first three-wire coupling line TCL1 and the second three-wire coupler TCL2 provide bandpass filtering performance, and the three transmission poles generated within the passband ensure a wide filtering bandwidth. The auxiliary resistor Re1 not only improves isolation performance but also balances the absorption bandwidth, absorbing reflected signals at the edge of the passband. The I-shaped absorption-isolation composite structure 101 not only achieves no reflection at the output end but also incorporates isolation performance. Therefore, the auxiliary resistor Re1 and the I-shaped absorption-isolation composite structure 101 together achieve the functions of full-band absorption and full-band isolation.

[0033] This invention designs a balanced to single-ended wide common-mode rejection non-reflection filter power divider with a center frequency of 2GHz, and verifies it through simulation. The structural parameters in the circuit are Z... e1 =85Ω, Zo1 =40Ω, Z1=57.5Ω, Z2=150Ω, R1=183.4Ω, R2=336.8Ω, R3=57.8Ω, port impedance is 50Ω. The dimensions of the first three-wire coupler TCL1 and the second three-wire coupler TCL2 in the circuit are as follows: Figure 2 As shown, L1 = 23.9 mm, W1 = 2.61 mm, W2 = 0.87 mm, and S = 0.16 mm.

[0034] Figure 3 The differential mode transmission coefficient S obtained by ADS simulation software in this embodiment is... dd21 &S dd31 Differential input reflection coefficient S dd11 Differential mode output reflection coefficient S dd22 &S dd33 As shown in the figure, the center frequency is 2GHz, and the differential mode 3-dB relative bandwidth is 30% (corresponding to a frequency band of 1.7-2.34GHz). The differential mode input reflection coefficient S... dd11 Three zero-reflection points are generated within the passband, located at 1.83 GHz, 2 GHz, and 2.19 GHz, respectively. The reflection coefficient S at the differential mode output is... dd22 and S dd33 The absorption capacity is less than -13.6dB in the 0-5GHz frequency band, demonstrating good absorption performance across the entire frequency band.

[0035] Figure 4 The differential isolation coefficient S obtained by ADS simulation software in this embodiment is... dd23 and common mode suppression S cc21 As can be seen from the figure, the isolation coefficient S of the differential signal... dd34 The isolation level remains below -18.2dB across the 0-5GHz frequency band, demonstrating excellent full-band isolation performance. The common-mode signal transmission coefficient S... cc21 It can suppress common-mode rejection to above 21.9dB in the 0-5GHz frequency band and achieve common-mode rejection of above 24.7dB in the differential mode passband, exhibiting wide common-mode rejection and good common-mode rejection performance.

[0036] To illustrate the isolation function and the auxiliary function of adjusting the absorption bandwidth achieved by the auxiliary resistor Re1, the auxiliary resistor Re1 in the filter power divider structure of this invention is removed, forming... Figure 5 The structure shown, with other parameters remaining unchanged, yields S-parameter curves that are comparable to those of the present invention. Figure 6 and Figure 7 As shown. From Figure 6 It can be seen that the output reflection coefficient S of the filter power divider circuit A, which lacks the auxiliary resistor Re1, at the passband edge is... dd22 &S dd33Above -10dB, the filter power divider circuit A, compared to this invention, does not possess full-band absorption performance. From Figure 7 It can be seen that the isolation coefficient S of the filter power divider circuit A without auxiliary resistor Re1 in the passband is... dd23 The difference is only around -15dB, indicating that the auxiliary resistor Re1 can improve the in-band isolation by about 13dB.

[0037] To illustrate the output-end reflection-free and isolation functions achieved by the "I"-shaped absorption-isolation composite structure 101, the "I"-shaped absorption-isolation composite structure 101 in the filter power divider structure of this invention is removed, forming... Figure 8 The structure shown, with other parameters remaining unchanged, yields S-parameter curves that are comparable to those of the present invention. Figure 9 and Figure 10 As shown. From Figure 9 It can be seen that the filter power divider circuit lacking the "I"-shaped absorption-isolation composite structure 101 loses its full-band anti-reflection function at the output end, and the matching within the passband is also worse compared to the present invention. From Figure 10 It can be seen that the isolation of the filter power divider circuit B without the "I"-shaped absorption-isolation composite structure 101 in the passband is only 10dB. The isolation in the passband achieved by the present invention is close to 30dB. Compared with the filter power divider circuit B without the "I"-shaped absorption-isolation composite structure 101, although the out-of-band isolation performance is deteriorated, the full-band isolation is still above 18.2dB.

[0038] This invention utilizes an I-shaped absorption-isolation composite structure 101 with integrated absorption and isolation functions, along with an auxiliary resistor Re1 that provides isolation and adjusts the absorption bandwidth, to achieve full-band reflection-free and full-band isolation at the output. This improves circuit utilization and results in a simple, compact, and easily integrated structure. Simultaneously, a half-wavelength coupling line CL1 achieves a wide common-mode rejection bandwidth and excellent common-mode rejection performance.

[0039] The specific implementation schemes described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific implementation schemes of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider, characterized by, Includes a half-wavelength coupling line CL1, a first three-wire coupling line TCL1, a second three-wire coupler TCL2, an auxiliary resistor Re1, an "I"-shaped absorption-isolation composite structure (101), and a balanced input port P. 1+ / P 1- The first single-ended output port P2 and the second single-ended output port P3; the balanced input port P 1+ / P 1- The half-wavelength coupling line CL1 is connected to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2. The first three-wire coupling line TCL1 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure (101) and the first single-ended output port P2. The second three-wire coupler TCL2 is connected to the auxiliary resistor Re1, the "I"-shaped absorption-isolation composite structure (101) and the second single-ended output port P3.

2. A balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider according to claim 1, characterized in that, The half-wavelength coupling line CL1 includes a first coupling line CL1a and a second coupling line CL1b; the first three-wire coupling line TCL1 includes a third coupling line TCL1a, a fourth coupling line TCL1b, and a fifth coupling line TCL1c; the second three-wire coupler TCL2 includes a sixth coupling line TCL2a, a seventh coupling line TCL2b, and an eighth coupling line TCL2c; wherein, one end of the first coupling line CL1a is connected to the balanced input port P. 1+ The other end of the first coupling line CL1a is connected to the balanced input port P. 1- Connection; one end of the second coupling line CL1b is connected to the balanced input port P respectively. 1+ The first coupling line CL1a is connected to one end, and the second coupling line CL1b is connected to one end of the third coupling line TCL1a and one end of the sixth coupling line TCL2a respectively. The third coupling line TCL1a is connected to one end of the auxiliary resistor Re1. The sixth coupling line TCL2a is connected to the other end of the auxiliary resistor Re1. The fourth coupling line TCL1b is open at one end and short-circuited to ground at the other end. The seventh coupling line TCL2b is open at one end and short-circuited to ground at the other end. The fifth coupling line TCL1c is connected to the first single-ended output port P2 at one end and to the "I"-shaped absorption-isolation composite structure (101) at the other end. The eighth coupling line TCL2c is connected to the second single-ended output port P3 at one end and to the "I"-shaped absorption-isolation composite structure (101) at the other end.

3. A balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider according to claim 2, characterized in that, The "I"-shaped absorption-isolation composite structure (101) includes a first transmission line structure TL1 to a fourth transmission line structure TL4, a resistor Re2, a first grounding resistor Re3, and a second grounding resistor Re4; one end of the first transmission line structure TL1 is connected to the other end of the fifth coupling line TCL1c, and the other end of the first transmission line structure TL1 is connected to one end of the second transmission line structure TL2 and one end of the first grounding resistor Re3 respectively; the other end of the first grounding resistor Re3 is short-circuited to ground; the other end of the second transmission line structure TL2 is connected to one end of the resistor Re2; the other end of the resistor Re2 is connected to one end of the third transmission line structure TL3; the other end of the third transmission line structure TL3 is connected to one end of the fourth transmission line structure TL4 and one end of the second grounding resistor Re4 respectively; the other end of the second grounding resistor Re4 is short-circuited to ground; the other end of the fourth transmission line structure TL4 is connected to the other end of the eighth coupling line TCL2c.

4. A balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider according to claim 3, characterized in that, Microwave radio frequency signals from balanced input port P 1+ / P 1- Feed in when a pair of differential signals are fed from the balanced input port P 1+ / P 1- During feeding, from the balanced input port P 1- The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signals pass through the second coupling line CL1b and are then evenly distributed to the first three-wire coupling line TCL1 and the second three-wire coupler TCL2, achieving signal division and filtering. Simultaneously, the signals pass through the auxiliary resistor Re1 and the I-shaped absorption-isolation composite structure (101) to achieve reflection-free and isolation functions. Finally, the differential-mode signal is output through the first single-ended output port P2 and the second single-ended output port P3. When a pair of common-mode signals are input from the balanced input port P... 1+ / P 1- During feeding, from the balanced input port P 1- The input signal passes through the first coupling line CL1a and connects to the balanced input port P. 1+ The input signal is canceled at one end of the first coupling line CL1a, achieving wideband common-mode suppression.

5. A balanced-to-single-ended wide common-mode rejection reflectionless filtering power divider according to claim 3, characterized in that, The first transmission line structure TL1 to the fourth transmission line structure TL4 are all quarter-wavelength transmission lines.

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