A simple ultra-wideband detection device

Abstract

The utility model belongs to the technical field of detection device, and relates to a simple and easy ultra wide band detection device. The device includes microstrip line, first detection circuit, second detection circuit and PCB board, first detection circuit and second detection circuit are all arranged on the PCB board, the input port of microstrip line is connected with the input port of radio frequency signal, and the output port of microstrip line is connected with the physiotherapy probe. The utility model simplifies the assembly process, reduces the volume of the device, solves the problem of large multi-stage microstrip coupling insertion loss, reduces the energy loss of signal in the transmission process, expands the bandwidth of the detection device, and avoids the problem of unstable work caused by easy failure when facing strong power signal.

Description

Technical Field

[0001] This utility model belongs to the field of detection device technology, specifically, it relates to a simple ultra-wideband detection device. Background Technology

[0002] Ultra-wideband detectors play a crucial role in many fields, including wireless communication, radar detection, and electromagnetic compatibility testing. They are mainly used to detect the power of wideband electromagnetic signals.

[0003] Currently, ultra-wideband detectors mainly employ coaxial microstrip coupling and multi-stage microstrip coupling. However, coaxial microstrip coupling, due to its structural characteristics, results in a complex assembly process and a large device size, significantly limiting its use in space-constrained applications. Multi-stage microstrip coupling, on the other hand, suffers from high insertion loss, leading to substantial energy loss during signal transmission. Furthermore, it has low power tolerance, making it prone to malfunction and unstable operation when faced with high-power signals. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a simple ultra-wideband detection device, including a microstrip line, a first detection circuit, a second detection circuit, and a PCB board; both the first detection circuit and the second detection circuit are mounted on the PCB board; the input port of the microstrip line is connected to the input port of the radio frequency signal, and the output port of the microstrip line is connected to the physiotherapy probe;

[0005] The first detection circuit includes a first attenuation circuit, a first coupling port, a second coupling port, a first isolation terminal absorption load circuit, and a first detection diode; the cathode of the first detection diode is electrically connected to the output terminal of the first detection circuit; the anode of the first detection diode is electrically connected to the first terminal of the first attenuation circuit, the second terminal of the first attenuation circuit is electrically connected to the first terminal of the first coupling port, the second terminal of the first coupling port is electrically connected to one terminal of the first isolation terminal absorption load circuit, and the other terminal of the first isolation terminal absorption load circuit is grounded;

[0006] The second detection circuit includes a second attenuation circuit, a third coupling port, a fourth coupling port, a second isolation terminal absorption load circuit, and a second detection diode; the cathode of the second detection diode is electrically connected to the output terminal of the second detection circuit; the anode of the second detection diode is electrically connected to the first terminal of the second attenuation circuit, the second terminal of the second attenuation circuit is electrically connected to the first terminal of the third coupling port, the second terminal of the third coupling port is electrically connected to one terminal of the second isolation terminal absorption load circuit, and the other terminal of the second isolation terminal absorption load circuit is grounded;

[0007] The first and fourth coupling ports are coupling ports, both located on the input port side of the microstrip line; the second and third coupling ports are coupling ports, both located on the output port side of the microstrip line.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the first attenuation circuit includes a first resistor, a second resistor, and a third resistor; the anode of the first detector diode is connected to the second end of the first resistor and the first end of the second resistor; the first end of the second resistor and the first end of the third resistor are grounded; the second end of the second resistor and the second end of the third resistor are electrically connected to the first end of the first coupling port; the second end of the first coupling port is electrically connected to one end of the second coupling port.

[0010] Furthermore, the second attenuation circuit includes a fourth resistor, a fifth resistor, and a sixth resistor; the anode of the second detector diode is connected to the second end of the fourth resistor and the first end of the fifth resistor; the first end of the fifth resistor and the first end of the sixth resistor are grounded; the second end of the fifth resistor and the second end of the sixth resistor are electrically connected to the first end of the third coupling port; the second end of the third coupling port is electrically connected to one end of the fourth coupling port.

[0011] Furthermore, the first attenuation circuit and the second attenuation circuit have the same circuit structure, and the attenuation amount is 3dB for both.

[0012] Furthermore, the first isolation terminal load absorption circuit includes a seventh resistor; one end of the second coupling port is grounded through the seventh resistor; the second isolation terminal load absorption circuit includes an eighth resistor; one end of the fourth coupling port is grounded through the eighth resistor.

[0013] Furthermore, the cathode of the first detector diode is also connected to a first filter circuit; the cathode of the first detector diode is electrically connected to the output terminal of the first detector circuit through the first filter circuit; the first filter circuit includes a first filter capacitor; one end of the first filter capacitor is electrically connected to the cathode of the first detector diode, and the other end is grounded.

[0014] Furthermore, the cathode of the second detector diode is also connected to a second filter circuit; the cathode of the second detector diode is electrically connected to the output terminal of the second detector circuit through the second filter circuit; the second filter circuit includes a second filter capacitor; one end of the second filter capacitor is electrically connected to the cathode of the second detector diode, and the other end is grounded.

[0015] Furthermore, the first isolation terminal load absorption circuit includes a ninth resistor; one end of the ninth resistor is connected to the second coupling port, and the other end is grounded; the second isolation terminal load absorption circuit includes a tenth resistor; one end of the tenth resistor is connected to the third coupling port, and the other end is grounded.

[0016] Furthermore, the cathodes of the first and second detector diodes are each connected to a grounding resistor.

[0017] Furthermore, the air medium on the microstrip line is a compressed polyetheretherketone material.

[0018] The beneficial effects of this utility model are: it simplifies the assembly process, reduces the size of the device, solves the problem of high insertion loss in multi-stage microstrip coupling, reduces energy loss during signal transmission, expands the bandwidth of the detector, and avoids the problem of easy failure and unstable operation when facing high-power signals. Attached Figure Description

[0019] Figure 1 A schematic block diagram of a simple ultra-wideband detector provided by this utility model;

[0020] Figure 2 A schematic block diagram of a simple ultra-wideband detector provided by this utility model;

[0021] Figure 3 Simulation using a media compression block; Attached Figure 3 In the figure, (a) represents the insertion loss of the fourth coupling port and the insertion loss of the third coupling port; Appendix Figure 3 In the figure, (b) represents the coupling degree of the first coupling port and the insertion loss of the second coupling port; Appendix Figure 3 (c) in the figure represents the microstrip line insertion loss;

[0022] Figure 4 To avoid using media compression block simulation; attached Figure 4 In the figure, (d) represents the coupling degree of the fourth coupling port and the coupling degree of the third coupling port; Appendix Figure 4 In this context, (e) represents the insertion loss of the first coupling port and the insertion loss of the second coupling port;

[0023] Icons: R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; R6 - Sixth resistor; R7 - Seventh resistor; R8 - Eighth resistor; R9 - Ninth resistor; R10 - Tenth resistor; C1 - First filter capacitor; C2 - Second filter capacitor; D1 - First detector diode; D2 - Second detector diode; M - Microstrip line; H1 - First coupling port; H2 - Second coupling port; H3 - Third coupling port; H4 - Fourth coupling port. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] As an example, see the attached document. Figure 1 As shown, to solve the above technical problems, this embodiment provides a simple ultra-wideband detection device, including a microstrip line, a first detection circuit, a second detection circuit, and a PCB board; both the first and second detection circuits are mounted on the PCB board; the input port of the microstrip line is connected to the input port of the radio frequency signal, and the output port of the microstrip line is connected to the physiotherapy probe;

[0026] The first detection circuit includes a first attenuation circuit, a first coupling port, a second coupling port, a first isolation terminal absorption load circuit, and a first detection diode; the cathode of the first detection diode is electrically connected to the output terminal of the first detection circuit; the anode of the first detection diode is electrically connected to the first terminal of the first attenuation circuit, the second terminal of the first attenuation circuit is electrically connected to the first terminal of the first coupling port, the second terminal of the first coupling port is electrically connected to one terminal of the first isolation terminal absorption load circuit, and the other terminal of the first isolation terminal absorption load circuit is grounded;

[0027] The second detection circuit includes a second attenuation circuit, a third coupling port, a fourth coupling port, a second isolation terminal absorption load circuit, and a second detection diode; the cathode of the second detection diode is electrically connected to the output terminal of the second detection circuit; the anode of the second detection diode is electrically connected to the first terminal of the second attenuation circuit, the second terminal of the second attenuation circuit is electrically connected to the first terminal of the third coupling port, the second terminal of the third coupling port is electrically connected to one terminal of the second isolation terminal absorption load circuit, and the other terminal of the second isolation terminal absorption load circuit is grounded;

[0028] The first and fourth coupling ports are coupling ports, both located on the input port side of the microstrip line; the second and third coupling ports are coupled, both located on the output port side of the microstrip line.

[0029] In practical applications, as shown in the appendix Figure 2 As shown, the first coupling port H1 is the coupling output terminal, and the second coupling port H2 is connected to the first isolation terminal load absorption circuit; the third coupling port H3 serves as the isolation output terminal, and the fourth coupling port H4 is connected to the second isolation terminal load absorption circuit. The first attenuation circuit connected to the first coupling port and the second attenuation circuit connected to the second coupling port can improve the standing wave ratio between the port and the detector diode, and the signal outputs a detector voltage after passing through the detector diode.

[0030] The signal is coupled through the electromagnetic interaction between the microstrip lines M. The direction of the capacitive induced current at the fourth coupling port H4 and the first coupling port H1 is the same as the direction of the electromagnetic induced current, and the two are superimposed. The direction of the capacitive induced current at the third coupling port H3 and the second coupling port H2 is opposite to the direction of the electromagnetic induced current, and the two cancel each other out.

[0031] This invention simplifies the assembly process, reduces the size of the device, solves the problem of high insertion loss in multi-stage microstrip coupling, reduces energy loss during signal transmission, expands the bandwidth of the detector, and avoids the problem of unstable operation when facing high-power signals.

[0032] Optional, as shown in the appendix Figure 2 As shown, the first attenuation circuit includes a first resistor R1, a second resistor R2, and a third resistor R3; the anode of the first detector diode D1 is connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2; the first terminal of the second resistor R2 and the first terminal of the third resistor R3 are grounded; the second terminal of the second resistor R2 and the second terminal of the third resistor R3 are electrically connected to the first terminal of the first coupling port H1; the second terminal of the first coupling port H1 is electrically connected to the second coupling port H2.

[0033] Optional, as shown in the appendix Figure 2 As shown, the second attenuation circuit includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the anode of the second detector diode D2 is connected to the second terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5; the first terminals of the fifth resistor R5 and the sixth resistor R6 are grounded; the second terminals of the fifth resistor R5 and the sixth resistor R6 are electrically connected to the first terminal of the third coupling port H2; the second terminal of the third coupling port H3 is electrically connected to one terminal of the fourth coupling port H4.

[0034] Optionally, the first attenuation circuit and the second attenuation circuit have the same circuit structure, and the attenuation is 3dB for both.

[0035] Optional, as shown in the appendix Figure 2 As shown, the first isolation terminal absorbs the load circuit, which includes a seventh resistor R7; one end of the second coupling port H2 is grounded through the seventh resistor R7; the second isolation terminal absorbs the load circuit, which includes an eighth resistor R8; and one end of the fourth coupling port H4 is grounded through the eighth resistor R8.

[0036] Optional, as shown in the appendix Figure 2As shown, the cathode of the first detector diode D1 is also connected to a first filter circuit; the cathode of the first detector diode D1 is electrically connected to the output terminal of the first detector circuit through the first filter circuit; the first filter circuit includes a first filter capacitor C1; one end of the first filter capacitor C1 is electrically connected to the cathode of the first detector diode D1, and the other end is grounded.

[0037] Optional, as shown in the appendix Figure 2 As shown, the cathode of the second detector diode D2 is also connected to a second filter circuit; the cathode of the second detector diode D2 is electrically connected to the output terminal of the second detector circuit through the second filter circuit; the second filter circuit includes a second filter capacitor C2; one end of the second filter capacitor C2 is electrically connected to the cathode of the second detector diode D2, and the other end is grounded.

[0038] Optionally, the cathodes of the first detector diode D1 and the second detector diode D2 are also connected to grounding resistors. The cathode of the first detector diode D1 is connected to the ninth resistor R9, and the cathode of the second detector diode D2 is connected to the tenth resistor R10.

[0039] Optionally, the air medium on the microstrip line is a briquette of polyetheretherketone (PEEK).

[0040] In practical applications, the dielectric constant of the PCB board is 3.48. The air dielectric on the microstrip line is replaced with a polyetheretherketone (PEEK) material block with a dielectric constant of 3.5. This simplifies the installation structure and enables ultra-wideband detection.

[0041] Simulation parameters are attached. Figure 3 The simulation shown uses a dielectric compaction block. The vertical axis represents insertion loss in dB, and the horizontal axis represents frequency in GHz. (See attached diagram.) Figure 3 In (a) above, S31 represents the insertion loss of the fourth coupling port, and S32 represents the insertion loss of the third coupling port; as shown in the attached diagram. Figure 3 In (b) of the diagram, S33 represents the insertion loss of the first coupling port, and S34 represents the insertion loss of the second coupling port; as shown in the appendix. Figure 3 In (c), S35 represents the insertion loss of the microstrip line.

[0042] As attached Figure 4 The simulation without a medium is shown in the attached figure. Figure 4 In diagram (d), S36 represents the insertion loss of the fourth coupling port, and S37 represents the insertion loss of the third coupling port; as shown in the appendix. Figure 4In diagram (e), S38 represents the insertion loss of the first coupling port, and S39 represents the insertion loss of the second coupling port. The absolute values ​​of the differences between S36 and S37, and between S38 and S39, represent the directivity. Simulation results show that within the 0.5 GHz to 7.0 GHz frequency band, the differences between S31 and S32, and between S33 and S34, are at least 13 dB, and at most exceed 20 dB, indicating that the coupler has good directivity in the ultra-wideband frequency range (0.5 GHz to 7.0 GHz). The approximately 0.13 dB difference in S35 indicates that the coupler has low insertion loss.

[0043] The PCB material is Rogers-Ro4350 with a dielectric constant of 3.48, and the microstrip line is simulated with air as the dielectric. The simulation results show that the differences between S31 and S32, as well as between S38 and S39, are significantly lower in the 0.5GHz to 7.0GHz frequency band than when there is a dielectric block. At 7.0GHz, there is only 3dB of directivity, which cannot be used in actual projects.

[0044] This invention employs a dielectric block press-fit microstrip line structure, simplifying the assembly process and reducing volume; the use of PEEK material press blocks enables excellent detection performance under ultra-wideband conditions; furthermore, the adoption of a three-wire coupling method improves product stability.

[0045] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A simple ultra-wideband detector, characterized in that, It includes a microstrip line, a first detector circuit, a second detector circuit, and a PCB board; both the first and second detector circuits are mounted on the PCB board; the input port of the microstrip line is connected to the input port of the radio frequency signal, the output port of the microstrip line is connected to the physiotherapy probe, and the first coupling port and the third coupling port are connected to the detector circuit; The first detection circuit includes a first attenuation circuit, a first coupling port, a second coupling port, a first isolation terminal absorption load circuit, and a first detection diode; the cathode of the first detection diode is electrically connected to the output terminal of the first detection circuit; the anode of the first detection diode is electrically connected to the first terminal of the first attenuation circuit, the second terminal of the first attenuation circuit is electrically connected to the first terminal of the first coupling port, the second terminal of the first coupling port is electrically connected to one terminal of the first isolation terminal absorption load circuit, and the other terminal of the first isolation terminal absorption load circuit is grounded; The second detection circuit includes a second attenuation circuit, a third coupling port, a fourth coupling port, a second isolation terminal absorption load circuit, and a second detection diode; the cathode of the second detection diode is electrically connected to the output terminal of the second detection circuit; the anode of the second detection diode is electrically connected to the first terminal of the second attenuation circuit, the second terminal of the second attenuation circuit is electrically connected to the first terminal of the third coupling port, the second terminal of the third coupling port is electrically connected to one terminal of the second isolation terminal absorption load circuit, and the other terminal of the second isolation terminal absorption load circuit is grounded; The first coupling port and the fourth coupling port are coupling ports, both located on the input port side of the microstrip line; The second and third coupling ports are coupling ports, both located on the output port side of the microstrip line.

2. The simplified ultra-wideband detector according to claim 1, characterized in that, The first attenuation circuit includes a first resistor, a second resistor, and a third resistor; the anode of the first detector diode is connected to the second end of the first resistor and the first end of the second resistor; the first end of the second resistor and the first end of the third resistor are grounded; the second end of the second resistor and the second end of the third resistor are electrically connected to the first end of the first coupling port; the second end of the first coupling port is electrically connected to one end of the second coupling port.

3. The simplified ultra-wideband detector according to claim 1, characterized in that, The second attenuation circuit includes a fourth resistor, a fifth resistor, and a sixth resistor; the anode of the second detector diode is connected to the second terminal of the fourth resistor and the first terminal of the fifth resistor; the first terminal of the fifth resistor and the first terminal of the sixth resistor are grounded; the second terminal of the fifth resistor and the second terminal of the sixth resistor are electrically connected to the first terminal of the third coupling port; the second terminal of the third coupling port is electrically connected to one terminal of the fourth coupling port.

4. The simplified ultra-wideband detector according to claim 1, characterized in that, The first attenuation circuit and the second attenuation circuit have the same circuit structure, and the attenuation is 3dB for both.

5. The simplified ultra-wideband detector according to claim 1, characterized in that, The first isolation terminal absorbs the load circuit, which includes a seventh resistor; one end of the second coupling port is grounded through the seventh resistor; the second isolation terminal absorbs the load circuit, which includes an eighth resistor; one end of the fourth coupling port is grounded through the eighth resistor.

6. The simplified ultra-wideband detector according to claim 1, characterized in that, The cathode of the first detector diode is also connected to a first filter circuit; the cathode of the first detector diode is electrically connected to the output terminal of the first detector circuit through the first filter circuit; the first filter circuit includes a first filter capacitor; one end of the first filter capacitor is electrically connected to the cathode of the first detector diode, and the other end is grounded.

7. The simplified ultra-wideband detector according to claim 1, characterized in that, The cathode of the second detector diode is also connected to a second filter circuit; the cathode of the second detector diode is electrically connected to the output terminal of the second detector circuit through the second filter circuit; the second filter circuit includes a second filter capacitor; one end of the second filter capacitor is electrically connected to the cathode of the second detector diode, and the other end is grounded.

8. The simplified ultra-wideband detector according to claim 1, characterized in that, The cathodes of the first and second detector diodes are also connected to grounding resistors.

9. The simplified ultra-wideband detector according to claim 1, characterized in that, The air medium on the microstrip line is a compressed polyetheretherketone material.

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