A novel wideband high-isolation power divider applied to radio frequency acquisition system

Abstract

The application belongs to the technical field of radio frequency communication, and discloses a novel wideband high-isolation power divider applied to a radio frequency acquisition system, which comprises: a first transmission circuit, one end of which is connected with an input end; the first transmission circuit is composed of two sections of transmission lines in series; a first short-circuit stub line is connected between the two sections of transmission lines of the first transmission circuit; two second transmission circuits, one end of each of which is simultaneously connected with the other end of the first transmission circuit, and the other end of each of the two second transmission circuits is connected with two output ends one by one; the second transmission circuit is composed of two sections of transmission lines in series; two second short-circuit stub lines are symmetrically connected at the connection position of the second transmission circuit and the first transmission circuit; a first isolation resistor is connected across the two second transmission circuits, and the first isolation resistor is located between the two sections of transmission lines in series in the second transmission circuit; a second isolation resistor is connected across the two second transmission circuits, and the second isolation resistor is located between the transmission line in the second transmission circuit and the output end.

Description

Technical Field

[0001] This invention relates to the field of radio frequency communication technology, and in particular to a novel broadband high-isolation power divider for use in radio frequency acquisition systems. Background Technology

[0002] Radio frequency energy harvesting technology can convert electromagnetic wave energy in the environment into DC power to power low-power electronic devices or charge their batteries, and has broad application prospects in the fields of the Internet of Things and wireless sensor networks.

[0003] A typical radio frequency (RF) energy harvesting system usually includes core components such as a broadband antenna for capturing ambient electromagnetic signals, a power divider for distributing and combining RF signals, and a rectifier for converting RF energy into DC power. Among these, the power divider plays a crucial role. It is responsible for efficiently combining and distributing RF energy collected from multiple antennas or the same broadband antenna, distributed across different frequency bands (such as ISM / WiFi / 5G bands).

[0004] The performance of a power divider directly determines the efficiency and stability of the entire energy harvesting system. Specifically, its low voltage standing wave ratio (VSWR) ensures minimal signal reflection loss during transmission, thereby reducing energy loss; while its high isolation between outputs effectively prevents harmful mutual interference between energy harvesting channels, ensuring system stability. These two performance indicators are crucial for maximizing the overall power harvesting efficiency of the system. However, to match broadband antennas and cover a wider range of available environmental RF spectrum, higher demands are placed on the operating bandwidth of the power divider. Maintaining high isolation between outputs over a wide bandwidth is also a technical challenge. Existing power dividers still have room for improvement in bandwidth expansion and isolation performance.

[0005] Therefore, in response to the application requirements of radio frequency energy harvesting systems, there is an urgent need for a power divider with a wider operating bandwidth and higher port isolation to improve the power conversion efficiency and operational reliability of the entire energy harvesting system, thereby promoting the practical application and development of this technology. Summary of the Invention

[0006] The purpose of this invention is to provide a novel broadband high-isolation power divider for use in radio frequency acquisition systems. By introducing a pre-network before the power divider node, it can achieve higher-order filtering characteristics and has high isolation over a wide bandwidth.

[0007] The technical solution provided by this invention is as follows:

[0008] A novel broadband high-isolation power divider for use in radio frequency acquisition systems includes:

[0009] Input terminal;

[0010] Two output terminals;

[0011] A first transmission circuit, one end of which is connected to the input terminal;

[0012] The first transmission circuit consists of two transmission lines connected in series.

[0013] The first short-circuit stub is connected between the two transmission lines of the first transmission circuit.

[0014] Two second transmission circuits are arranged symmetrically; one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals.

[0015] The second transmission circuit consists of two transmission lines connected in series.

[0016] Two second short-circuit stubs are provided, each corresponding to one of the second transmission circuits; the second short-circuit stubs are connected at the connection point between the second transmission circuit and the first transmission circuit.

[0017] A first isolation resistor is connected across the two second transmission circuits, and the first isolation resistor is located between two transmission lines connected in series in the second transmission circuit.

[0018] The second isolation resistor is connected across the two second transmission circuits, and the second isolation resistor is located between the transmission line and the output terminal in the second transmission circuit.

[0019] Preferably, both the transmission lines in the first transmission circuit and the transmission lines in the second transmission circuit are quarter-wavelength transmission lines.

[0020] Preferably, both the first short-circuit stub and the second short-circuit stub are quarter-wavelength short-circuit stubs.

[0021] Preferably, the impedance of the output terminal is 50Ω.

[0022] A novel broadband high-isolation power divider for use in radio frequency acquisition systems includes:

[0023] Input terminal;

[0024] Two output terminals;

[0025] A first transmission circuit, one end of which is connected to the input terminal;

[0026] The first transmission circuit consists of three transmission lines connected in series.

[0027] The two first short-circuit stubs are connected one-to-one to the two connection points formed by the series connection of the three transmission lines in the first transmission circuit.

[0028] Two second transmission circuits are arranged symmetrically; one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals.

[0029] The second transmission circuit consists of two transmission lines connected in series.

[0030] Two second short-circuit stubs are provided, each corresponding to one of the second transmission circuits; the second short-circuit stubs are connected at the connection point between the second transmission circuit and the first transmission circuit.

[0031] A first isolation resistor is connected across the two second transmission circuits, and the first isolation resistor is located between two transmission lines connected in series in the second transmission circuit.

[0032] A second isolation resistor is connected across the two second transmission circuits, and the second isolation resistor is located between the transmission line and the output terminal in the second transmission circuit.

[0033] Preferably, both the transmission lines in the first transmission circuit and the transmission lines in the second transmission circuit are quarter-wavelength transmission lines.

[0034] Preferably, both the first short-circuit stub and the second short-circuit stub are quarter-wavelength short-circuit stubs.

[0035] Preferably, the impedance of the output terminal is 50Ω.

[0036] The beneficial effects of this invention are:

[0037] (1) The novel broadband high isolation power divider for radio frequency acquisition systems provided by the present invention significantly improves port isolation: by introducing an optimized design of two resistors, the isolation performance between output terminals is effectively enhanced without worsening insertion loss.

[0038] (2) The novel broadband high isolation power divider for radio frequency acquisition system provided by the present invention has superior design flexibility and controllability: the key performance parameters such as the bandwidth of the power divider can be designed and preset according to the requirements, overcoming the limitations of fixed bandwidth and difficulty in optimization of traditional devices.

[0039] (3) The novel broadband high isolation power divider for radio frequency acquisition systems provided by the present invention provides an efficient solution for radio frequency energy harvesting systems: combining its advantages such as designable bandwidth, high isolation and low loss, the device can significantly improve the overall efficiency and stability of broadband radio frequency energy harvesting systems. Attached Figure Description

[0040] Figure 1 This is a circuit diagram of a novel broadband high-isolation power divider applied to an RF acquisition system in Embodiment 1 of the present invention.

[0041] Figure 2 This is a circuit diagram of a novel broadband high-isolation power divider applied to an RF acquisition system in Embodiment 2 of the present invention.

[0042] Figure 3 This is a schematic diagram of the theoretical S-parameters for Embodiment 1 (Design I) and Embodiment 2 (Design II) of the present invention.

[0043] Figure 4 This is a schematic diagram of the core impedance converter circuit of the power divider in Embodiment 1 of the present invention.

[0044] Figure 5 This is a schematic diagram of the core impedance converter circuit of the power divider in Embodiment 2 of the present invention.

[0045] Figure 6 This is a schematic diagram of the isolation bandwidth when using an isolation resistor R1 in Embodiment 1 of the present invention.

[0046] Figure 7 This is a schematic diagram of the isolation bandwidth when using two isolation resistors R1 and R2 in Embodiment 1 of the present invention.

[0047] Figure 8 This is a schematic diagram of the isolation bandwidth when using an isolation resistor R1 in Embodiment 2 of the present invention.

[0048] Figure 9 This is a schematic diagram of the isolation bandwidth when using two isolation resistors R1 and R1 in Embodiment 2 of the present invention.

[0049] Figure 10 Physical layout diagram of Embodiment 1 (Design I) of the present invention.

[0050] Figure 11 A photograph of the actual product of the layout processing of Embodiment 1 (Design I) of the present invention.

[0051] Figure 12 This is a comparison chart of the S-parameter simulation results and actual test results of Embodiment 1 (Design I) of the present invention.

[0052] Figure 13 Physical layout diagram of Embodiment 2 (Design II) of the present invention.

[0053] Figure 14 A photograph of the actual product of the layout processing of Embodiment 2 (Design II) of the present invention.

[0054] Figure 15 This is a comparison chart of the S-parameter simulation results and actual test results for Embodiment 2 (Design II) of the present invention. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0056] This invention provides a novel broadband high-isolation power divider for use in radio frequency acquisition systems. By introducing a pre-amplifier network before the power divider node, higher-order filtering characteristics can be achieved. The topology proposed in this invention allows for flexible and convenient design of the power divider according to specified bandwidth and return loss requirements.

[0057] The novel broadband high-isolation power divider for radio frequency acquisition systems provided by the present invention will be further described below with reference to specific embodiments.

[0058] Example 1 (Design I)

[0059] like Figure 1 As shown, the power divider in Embodiment 1 (Design I) includes: an input terminal, two output terminals, a first transmission circuit, two second transmission circuits, a first short-circuit stub line, two second short-circuit stub lines, a first isolation resistor, and a second isolation resistor.

[0060] The impedance value at the input terminal is Zs; the impedance values ​​at the two output terminals are Z0 respectively. One end of the first transmission circuit is connected to the input terminal; two second transmission circuits are symmetrically arranged, one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals.

[0061] The first transmission circuit consists of a transmission line (impedance value Z) 01 Electrical length θ ) and transmission lines (impedance value Z) 02 Electrical length θ Composed of series connections. First short-circuit stub (impedance value) Z S01 Electrical length θ One end of the circuit is connected between two transmission lines connected in series in the first transmission circuit, and the other end is grounded.

[0062] The second transmission circuit consists of a transmission line (impedance value Z3, electrical length...) θ ) and transmission lines (impedance value Z0, electrical length) θComposed of two series connections. Two second short-circuit stubs (impedance value) Z S2 Electrical length θ The two transmission circuits are configured one-to-one with each other; and the second short-circuit stub (impedance value) Z S2 Electrical length θ One end of the circuit is connected to the junction of the second transmission circuit and the first transmission circuit, and the other end is grounded.

[0063] The first isolation resistor R1 is connected across the two second transmission circuits, and the first isolation resistor R1 is located between two transmission lines connected in series in the second transmission circuit.

[0064] The second isolation resistor R1 is connected across the two second transmission circuits, and the second isolation resistor is located on the transmission line (impedance value Z0, electrical length) in the second transmission circuit. θ (between the output and the output terminals.)

[0065] In Embodiment 1, each transmission line in the first transmission circuit and each transmission line in the second transmission circuit are... λ / 4 (quarter wavelength) transmission line. Both the first and second short-circuit stubs are... λ / 4 (quarter wavelength) short-circuit stub line. The impedance value Z0 of the output terminal is 50Ω.

[0066] Example 2 (Design II)

[0067] like Figure 2 As shown, the power divider in Embodiment 2 (Design II) includes: an input terminal, two output terminals, a first transmission circuit, two second transmission circuits, two first short-circuit stubs, two second short-circuit stubs, a first isolation resistor, and a second isolation resistor.

[0068] The impedance value at the input terminal is Zs; the impedance values ​​at the two output terminals are Z0 respectively. One end of the first transmission circuit is connected to the input terminal; two second transmission circuits are symmetrically arranged, one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals.

[0069] The first transmission circuit consists of a transmission line (impedance value Z) 01 Electrical length θ ), transmission line (impedance value Z) 02 Electrical length θ ) and transmission lines (impedance value Z) 03 Electrical length θThe three transmission lines in the first transmission circuit are connected in series. Two first short-circuit stubs are connected one-to-one at the two connection points formed by the series connection of the three transmission lines in the first transmission circuit; specifically, one first short-circuit stub (impedance value) Z S01 Electrical length θ One end of the impedance is connected to the transmission line (impedance value Z). 01 Electrical length θ ) and transmission lines (impedance value Z) 02 Electrical length θ Between the two ends, one end is grounded; the other end is a first short-circuit stub (impedance value) Z S02 Electrical length θ One end of the impedance is connected to the transmission line (impedance value Z). 02 Electrical length θ ) and transmission lines (impedance value Z) 03 Electrical length θ One end is between the two ends, and the other end is grounded.

[0070] The second transmission circuit consists of a transmission line (impedance value Z4, electrical length...) θ ) and transmission lines (impedance value Z0, electrical length) θ Composed of two series connections. Two second short-circuit stubs (impedance value) Z S02 Electrical length θ The two transmission circuits are configured one-to-one with each other; and the second short-circuit stub (impedance value) Z S02 Electrical length θ One end of the circuit is connected to the junction of the second transmission circuit and the first transmission circuit, and the other end is grounded.

[0071] The first isolation resistor R1 is connected across the two second transmission circuits, and the first isolation resistor R1 is located between two transmission lines connected in series in the second transmission circuit.

[0072] The second isolation resistor R1 is connected across the two second transmission circuits, and the second isolation resistor is located on the transmission line (impedance value Z0, electrical length) in the second transmission circuit. θ (between the output and the output terminals.)

[0073] In embodiment 2, both the transmission lines in the first transmission circuit and the transmission lines in the second transmission circuit are... λ / 4 (quarter wavelength) transmission line. Both the first and second short-circuit stubs are... λ / 4 (quarter wavelength) short-circuit stub line. The impedance value Z0 of the output terminal is 50Ω.

[0074] Theoretical analysis is performed on the two power divider structures provided in Embodiments 1 and 2, such as... Figure 3 As shown. First, two different types of shared networks were designed before the power distribution node to broaden the return loss bandwidth. Specifically, Embodiment 1 (Design I) and Embodiment 2 (Design II) implemented fourth-order and fifth-order Chebyshev function responses, respectively. Figure 3 As shown, both designs achieve 100% 20-dB return loss bandwidth, indicating that both topologies exhibit good bandpass response characteristics within the passband. Example 1 (Design I) has a simple structure and achieves -20dB isolation; in contrast, Example 2 (Design II) increases structural complexity, improving isolation to -25dB. Furthermore, all impedance parameters for both designs can be determined through comprehensive theory. Finally, good isolation and port matching can be ensured using only two isolation resistors.

[0075] The working principle of the broadband power divider provided by this invention is explained below. To achieve broadband matching, it is necessary to first... Figure 4-5 The two filter converters shown are designed in combination. Figure 4 and 5 The impedance converter is used to construct the branch of the proposed power divider. With the impedance matching device well designed, the overall architecture of the power divider is built on this basis, which includes the quantitative design of the common impedance before the power divider node and the connection of two isolation resistors.

[0076] by Figure 4 The filter converter I shown is used as an example for detailed discussion. The proposed broadband filter converter design includes impedance transformation ratio. r = Z S / Z 0 (where the source impedance value is...) Z S Output impedance Z (0 is 50 Ω). To achieve a fourth-order equiripple response, a Chebyshev polynomial function was used. The theoretical S-parameters of this broadband filter converter can be expressed by formula (1).

[0077] (1)

[0078] in,

[0079] (2)

[0080] In formulas (1) and (2), ε It is the ripple constant related to the minimum return loss (dB) within the passband. It is a quantity related to the electrical phase at low cutoff frequencies. Represents the normalized frequency variable. This indicates a phase shift.

[0081] Figure 4 All impedance parameters in Z 1, Z 2, Z 3, Z S1 and Z S2 All based on load impedance Z Normalization is performed with 0 as the baseline, and the normalized values ​​are as follows: Z 1, Z 2, Z 3, Z S1 and Z S2 , y S1 for Z S1 The reciprocal, y S2 for Z S2 The reciprocal of, that is y S1 =1 / Z S2 , y S2 =1 / Z S2 Subsequently, the corresponding theoretical S-parameters can be converted as follows:

[0082] (3)

[0083] The filter converter as a whole A 1. B 1. C 1 and D One parameter can be obtained by multiplying the matrices of each transmission line element (ABCD). This is derived from the formula. Figure 4 The function F of the filter converter I shown can be expressed as:

[0084] (4)

[0085] in,

[0086] (5a)

[0087] (5b)

[0088] (5c)

[0089] (5d)

[0090] (5e)

[0091] In the formula, F The characteristic function of the filter is represented. , , , , These coefficients are combinations of filter structure parameters (impedance, admittance, etc.). They do not have independent physical meaning in themselves, but are used for simplification. F The intermediate coefficients introduced by the expression.

[0092] By solving equations (1) and (3), the five normalized impedance parameters are obtained. Z 1, Z2, Z 3. y S1 and y S2 All can be determined by specifying the fractional bandwidth (FBW), return loss (RL), and impedance transformation ratio (FVR). r The impedance transformation ratio is uniquely determined. To achieve equal power distribution, this invention designs and simulates the impedance transformation ratio. r A filter converter with impedance = 2. Its impedance parameters satisfy the following relationship: Z 01 = Z 1 / 2, Z 02 = Z2 / 2, Z S01 = Z S1 / 2. The adoption of a shared network effectively reduces circuit size and expands the return loss bandwidth of the power divider.

[0093] To improve isolation performance, in Example 1 (e.g.) Figure 1 Two additional characteristic impedances are introduced into the structure shown. Z 0 λ / 4 resonator and two resistors. Example 2 (as shown) Figure 2 The broadband filtered power divider shown can be designed using a similar method. By balancing output port matching and isolation performance, the value of the isolation resistor can be finally determined.

[0094] Figure 6-9The simulation results of Embodiment 1 and Embodiment 2 of the broadband filter power divider proposed in this invention are compared when using different numbers of isolation resistors. Embodiment 1's broadband filter power divider has a narrow isolation bandwidth when using only one isolation resistor (first isolation resistor R1), and still fails to achieve an isolation level below -25 dB when using two isolation resistors (first isolation resistor R1 and second isolation resistor R2). In contrast, Embodiment 2's broadband filter power divider, after introducing two isolation resistors (first isolation resistor R1 and second isolation resistor R2), achieves both good port matching and a wider isolation bandwidth.

[0095] The present invention provides a novel broadband high-isolation power divider for use in radio frequency acquisition systems, which improves both the power division ratio and isolation by combining filtering characteristics. Both embodiments achieve good bandpass response characteristics, but in terms of isolation, Embodiment 2 is better than Embodiment 1.

[0096] Test case

[0097] For verification, on an RO4003C substrate (dielectric constant) The broadband filter power dividers of Examples 1 and 2 were designed, simulated, and fabricated on an area with a thickness of 3.55 mm and a thickness of 0.508 mm.

[0098] Example 1 Design Based on Figure 1 The structure shown has a center frequency of 2.2 GHz, a target relative bandwidth (FBW) of 90%, and a return loss (RL) of 25 dB. Its theoretically calculated parameters are: Z 01 = 36.5Ω, Z 02 = 19.9 Ω, Z 3 = 36.5 Ω Z S01 =148.8 Ω, Z s2 = 31.4 Ω.

[0099] The broadband filter power divider in Example 2 is based on Figure 2 The structure shown has a center frequency of 2.4 GHz, a target relative bandwidth of 100%, and a return loss of 15 dB. Its theoretically calculated parameters are: Z 01 = 33.5 Ω, Z 02 = 20.2 Ω, Z 03 = 14.3Ω, Z 4 = 33.5 Ω Z S01 = 57.7 Ω,Z S02 = 34.8 Ω, Z S03 = 31.4Ω, Z S04 = 31.4 Ω.

[0100] After global optimization and debugging, the power dividers in Examples 1 and 2 were respectively determined as follows: Figure 10 and 13 The physical layout is shown in the figure. Figure 11 and Figure 14 The images shown are actual product images of the layout processing in Embodiments 1 and 2 of the present invention, respectively.

[0101] Figure 10 The physical dimensions are characterized as follows: In the first transmission circuit (consisting of two transmission lines), the width of the first transmission line is 2.2 mm and the length is 10.87 mm; the second transmission line is cascaded with the first transmission line, and the width of the second transmission line is 4.9 mm and the length is 9.85 mm. In the second transmission circuit (consisting of two transmission lines), both transmission lines are bent into an L-shape. The width of the first transmission line in the second transmission circuit is 1.96 mm, and the total length is 19.79 mm. The first part of the first transmission line (L-shaped) has a length of 9.47 mm, and the second part has a length of 10.32 mm. The width of the second transmission line in the second transmission circuit is 1.13 mm, and the total length is 16.35 mm. The first part of the second transmission line (L-shaped) has a length of 8.37 mm, and the second part has a length of 7.98 mm. The width of the first short-circuit stub is 0.45 mm, and the length is 11.29 mm. The two second short-circuit stubs are exactly the same size, with a width of 2.89 mm and a length of 11.3 mm. Figure 10 The middle structure is a symmetrical structure. Figure 10 The surface mount resistor in the selection is as follows: R 1 = 68 Ω, R 2 = 270 Ω.

[0102] Figure 13The physical dimensions are characterized as follows: In the first transmission circuit (composed of three transmission lines), the width of the first transmission line is 1.95 mm and the length is 17.23 mm; the second transmission line is cascaded with the first transmission line, the width of the second transmission line is 3.7 mm and the length is 18.21 mm; the third transmission line is cascaded with the second transmission line, the width of the third transmission line is 5.77 mm and the length is 16.8 mm. In the second transmission circuit (composed of two transmission lines), both transmission lines are bent into an L-shape. The width of the first transmission line in the second transmission circuit is 2 mm and the total length is 18.27 mm. The first part of the first transmission line (L-shaped) has a length of 9.12 mm and the second part has a length of 9.15 mm. The width of the second transmission line in the second transmission circuit is 1.13 mm and the total length is 18.04 mm. The first part of the second transmission line (L-shaped) has a length of 9.19 mm and the second part has a length of 8.85 mm. The first short-circuit stub near the input terminal has a width of 0.95 mm and a length of 18.9 mm, while the other short-circuit stub has a width of 1.62 mm and a length of 19.57 mm. The two second short-circuit stubs are identical in size, with a width of 2.27 mm and a length of 19.76 mm. Figure 13 The middle structure is a symmetrical structure. Figure 13 The surface mount resistor in the selection is as follows: R 1 = 56 Ω, R 2 = 270 Ω.

[0103] The actual test results show that:

[0104] For the design of Example 1 (center frequency 2.2 GHz), the measured fractional bandwidth reached 108.6%, the return loss was better than 10.6 dB, and the in-band isolation exceeded 18.6 dB (isolation bandwidth reached 90%).

[0105] For the design of Example 2 (center frequency 2.4 GHz), the measured fractional bandwidth reached 103.7%, the return loss was better than 12.8 dB, and the in-band isolation exceeded 25 dB (isolation bandwidth reached 60%). Figure 12 and 15 The measurement results shown are in good agreement with the simulation results.

[0106] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A novel broadband high-isolation power divider for use in radio frequency acquisition systems, characterized in that: include: Input terminal; Two output terminals; A first transmission circuit, one end of which is connected to the input terminal; The first transmission circuit consists of two transmission lines connected in series. The first short-circuit stub is connected between the two transmission lines of the first transmission circuit. Two second transmission circuits are arranged symmetrically; one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals. The second transmission circuit consists of two transmission lines connected in series. Two second short-circuit stubs are provided, each corresponding to one of the second transmission circuits; the second short-circuit stubs are connected at the connection point between the second transmission circuit and the first transmission circuit. A first isolation resistor is connected across the two second transmission circuits, and the first isolation resistor is located between two transmission lines connected in series in the second transmission circuit. The second isolation resistor is connected across the two second transmission circuits, and the second isolation resistor is located between the transmission line and the output terminal in the second transmission circuit.

2. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to claim 1, characterized in that, Both the transmission lines in the first transmission circuit and the transmission lines in the second transmission circuit are quarter-wavelength transmission lines.

3. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to claim 2, characterized in that, Both the first short-circuit stub and the second short-circuit stub are quarter-wavelength short-circuit stubs.

4. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to any one of claims 1-3, characterized in that, The impedance of the output terminal is 50Ω.

5. A novel broadband high-isolation power divider for use in radio frequency acquisition systems, characterized in that: include: Input terminal; Two output terminals; A first transmission circuit, one end of which is connected to the input terminal; The first transmission circuit consists of three transmission lines connected in series. The two first short-circuit stubs are connected one-to-one to the two connection points formed by the series connection of the three transmission lines in the first transmission circuit. Two second transmission circuits are arranged symmetrically; one end of each of the two second transmission circuits is simultaneously connected to the other end of the first transmission circuit, and the other ends of the two second transmission circuits are connected one-to-one to the two output terminals. The second transmission circuit consists of two transmission lines connected in series. Two second short-circuit stubs are provided, each corresponding to one of the second transmission circuits; the second short-circuit stubs are connected at the connection point between the second transmission circuit and the first transmission circuit. A first isolation resistor is connected across the two second transmission circuits, and the first isolation resistor is located between two transmission lines connected in series in the second transmission circuit. A second isolation resistor is connected across the two second transmission circuits, and the second isolation resistor is located between the transmission line and the output terminal in the second transmission circuit.

6. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to claim 5, characterized in that, Both the transmission lines in the first transmission circuit and the transmission lines in the second transmission circuit are quarter-wavelength transmission lines.

7. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to claim 6, characterized in that, Both the first short-circuit stub and the second short-circuit stub are quarter-wavelength short-circuit stubs.

8. The novel broadband high-isolation power divider for use in radio frequency acquisition systems according to any one of claims 5-7, characterized in that, The impedance of the output terminal is 50Ω.

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