Short-wave impedance matcher

Abstract

The utility model discloses a short-wave impedance matcher. The short-wave impedance matcher is used for carrying out impedance conversion between an input resistor and an output resistor which are different in impedance and comprises at least two coaxial lines arranged between the input resistor and the output resistor. A magnetic ring is nested outside at least one of the at least two coaxial lines; the coaxial line comprises an inner conductor, an insulating layer and an outer conductor which are nested and connected from inside to outside. According to the electromagnetic coupling principle, the coaxial lines and the magnetic rings are introduced to serve as matching elements to replace inductors and capacitors, and broadband impedance matching of short-wave frequency is successfully achieved only through series connection, parallel connection and the like of the coaxial lines. The ultra-wideband filter has the advantages of simplicity in implementation, small size, wide frequency band, high bearing power and the like, and has a wide application prospect in various radio frequency circuit devices such as amplifiers, antennas and the like.

Description

Technical Field

[0001] This utility model relates to the technical field of impedance matching devices, and more specifically, to shortwave impedance matching devices. Background Technology

[0002] For electromagnetic waves to be transmitted effectively, impedance matching must be achieved at the ports of radio frequency circuits. Therefore, impedance matching devices are a basic radio frequency device and are widely used in amplifiers, antennas and other radio frequency circuit devices.

[0003] Shortwave is a very important part of the radio frequency band, with a frequency range from 3MHz to 30MHz, corresponding to a wavelength range of 10–100m. Using a quarter-wavelength impedance matching device in this band results in a very large circuit size, which is impractical in engineering. If inductors and capacitors are used for impedance matching, the operating frequency is very narrow, making broadband matching impossible. Achieving broadband matching would require multiple stages of inductors and capacitors, complicating the matching circuit and increasing insertion loss. Therefore, currently there is no shortwave impedance matching device that is small in size, has a wide bandwidth, and can handle high power. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a shortwave impedance matching device with small size, wide bandwidth, and high power handling capacity. The technical solution is as follows:

[0005] A shortwave impedance matching device for impedance transformation between input and output resistors with different impedances includes at least two coaxial lines disposed between the input and output resistors; at least one of the at least two coaxial lines has a magnetic ring nested on its outer side; the coaxial line includes an inner conductor, an insulating layer, and an outer conductor connected by inner and outer nesting.

[0006] As a further improvement to the above-mentioned shortwave impedance matching device: the input resistor is set at the input terminal of the shortwave impedance matching device, and the output resistor is set at the output terminal of the shortwave impedance matching device; the impedance of the output resistor is 2, 3 or 4 times the impedance of the input resistor.

[0007] As a further improvement to the aforementioned shortwave impedance matching device: when the output resistor's impedance is twice the input resistor's impedance, two coaxial lines are provided between the input and output resistors, each with a magnetic ring nested outside; the output terminal of the input resistor is connected to the inner conductor of the first coaxial line, the inner conductor of the second coaxial line, and the outer conductor of the second coaxial line, respectively; the input terminal of the output resistor is connected to the inner conductor of the first coaxial line and the inner conductor of the second coaxial line, respectively; the outer conductor of the first coaxial line is grounded; the outer conductor of the first coaxial line is connected to the outer conductor of the second coaxial line; the impedance of the first and second coaxial lines is equal to the impedance of the output resistor.

[0008] As a further improvement to the aforementioned shortwave impedance matching device: when the output resistor's impedance is three times the input resistor's impedance, four coaxial lines are provided between the input and output resistors, each with a magnetic ring nested around its exterior; the output terminal of the input resistor is connected to the inner conductor's beginning of the first, second, and fourth coaxial lines, respectively; the input terminal of the output resistor is connected to the inner conductor's end of the first and third coaxial lines, respectively; the outer conductor's beginning of the first coaxial line is connected to the outer conductor's beginning of the second coaxial line; the outer conductor's end of the first coaxial line is connected to the inner conductor's end of the second coaxial line; the outer conductor's beginning of the second coaxial line is connected to the inner conductor's beginning of the third coaxial line; the outer conductor's beginning of the third coaxial line is connected to the outer conductor's beginning of the fourth coaxial line; the outer conductor's end of the second, third, and fourth coaxial lines is connected to the inner conductor's end of the fourth coaxial line; both the outer conductor's beginning and end of the fourth coaxial line are grounded; the impedances of the first, second, third, and fourth coaxial lines are equal to the output resistor's impedance.

[0009] As a further improvement to the aforementioned shortwave impedance matching device: when the impedance of the output resistor is four times the impedance of the input resistor, two coaxial lines are provided between the input resistor and the output resistor, with only the first coaxial line having a magnetic ring nested outside; the output terminal of the input resistor is connected to the beginning of the inner conductor of the first coaxial line and the beginning of the inner conductor of the second coaxial line, respectively; the input terminal of the output resistor is connected to the end of the inner conductor of the first coaxial line; the beginning of the outer conductor of the first coaxial line is connected to the beginning of the outer conductor of the second coaxial line; the end of the outer conductor of the first coaxial line is connected to the end of the inner conductor of the second coaxial line; both the beginning and end of the outer conductor of the second coaxial line are grounded; the impedance of the first and second coaxial lines is equal to half the impedance of the output resistor.

[0010] This invention relates to a shortwave impedance matching device based on the principle of electromagnetic coupling. It introduces a coaxial line and a magnetic ring (i.e., a coaxial transformer) as matching elements to replace inductors and capacitors, successfully achieving broadband impedance matching at shortwave frequencies solely through series and parallel connections of the coaxial line. The combination of the coaxial transformer's line length and permeability allows for various low-frequency impedance transformations; the longer the line and the higher the permeability, the lower the operating frequency of the impedance matching device. High-permeability coaxial transformers can significantly reduce the size of the shortwave impedance matching device, thus facilitating its engineering implementation. Experimental verification shows that this invention's shortwave impedance matching device has advantages such as simple implementation, small size, wide bandwidth, and high power handling capacity, and has broad application prospects in amplifiers, antennas, and various other radio frequency circuit devices.

[0011] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention. Attached Figure Description

[0012] The accompanying drawings, which form part of this utility model, are used to aid in understanding this utility model. The contents provided in the drawings and their related descriptions in this utility model can be used to explain this utility model, but do not constitute an improper limitation of this utility model.

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of the shortwave impedance matching device according to Embodiment 1 of this utility model.

[0015] Figure 2 This is a schematic diagram of the coaxial line structure in the shortwave impedance matching device of Embodiment 1 of this utility model.

[0016] Figure 3 The equivalent circuit diagram of the shortwave impedance matching device of Embodiment 1 of this utility model is used in the simulation experiment of ADS professional commercial software.

[0017] Figure 4 The figure shows the simulation results of the shortwave impedance matching device of Embodiment 1 of this utility model.

[0018] Figure 5 This is a schematic diagram of the shortwave impedance matching device according to Embodiment 2 of this utility model.

[0019] Figure 6 This is a schematic diagram of the shortwave impedance matching device according to Embodiment 2 of this utility model.

[0020] The relevant markings in the above figures are:

[0021] 110 - Magnetic ring, 120 - Inner conductor, 130 - Insulating layer, 140 - Outer conductor, 210 - Input resistor, 220 - Output resistor, 310 - First coaxial line, 320 - Second coaxial line, 330 - Third coaxial line, 340 - Fourth coaxial line. Detailed Implementation

[0022] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0023] The technical solutions and features provided in the various parts of this utility model, including the following description, can be combined with each other without conflict.

[0024] Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the protection scope of the present invention.

[0025] Regarding the terminology and units used in this utility model: The terms "comprising," "having," and any variations thereof in the specification, claims, and related parts of this utility model are intended to cover non-exclusive inclusion.

[0026] Example 1

[0027] Figure 1 This is a schematic diagram of the shortwave impedance matching device in this embodiment. Figure 2 This is a schematic diagram of the coaxial line and magnetic ring in the shortwave impedance matching device of this embodiment. Figure 3 This is the equivalent circuit diagram of the shortwave impedance matching device in this embodiment, simulated using the professional commercial software ADS. Figure 4 The figure shows the simulation results of the shortwave impedance matching device in this embodiment.

[0028] like Figure 1 The shortwave impedance matching device shown is used to perform impedance transformation between an input resistor 210 and an output resistor 220 with different impedances. The input resistor 210 is located at the input terminal of the shortwave impedance matching device, and the output resistor 220 is located at the output terminal of the shortwave impedance matching device. The impedance of the output resistor 220 is twice the impedance of the input resistor 210. The shortwave impedance matching device includes two coaxial lines located between the input resistor 210 and the output resistor 220. A magnetic ring 110 is nested outside each of the two coaxial lines.

[0029] like Figure 2 As shown, the coaxial cable includes an inner conductor 120, an insulating layer 130, and an outer conductor 140 that are nested together.

[0030] like Figure 1-2As shown, the output terminal of the input resistor 210 is connected to the beginning of the inner conductor 120 of the first coaxial line 310, the beginning of the inner conductor 120 of the second coaxial line 320, and the end of the outer conductor 140 of the second coaxial line 320, respectively; the input terminal of the output resistor 220 is connected to the end of the inner conductor 120 of the first coaxial line 310 and the end of the inner conductor 120 of the second coaxial line 320, respectively; the beginning of the outer conductor 140 of the first coaxial line 310 is grounded; the end of the outer conductor 140 of the first coaxial line 310 is connected to the beginning of the outer conductor 140 of the second coaxial line 320; the impedance of the first coaxial line 310 and the second coaxial line 320 is equal to the impedance of the output resistor 220.

[0031] like Figure 3 As shown, the impedance of input resistor 210 is set to 25 ohms, and the impedances of the first coaxial cable 310, the second coaxial cable 320, and the output resistor 220 are all 50 ohms. The S-PARAMETERS (scattering parameters) are simulated and tested using ADS professional commercial software (version ADS2009). The simulated return loss curve and the insertion loss curve of the matching network are shown below. Figure 4 As shown. From Figure 4 As can be seen, the lower curve is the return loss curve of the port, and the upper curve (close to the horizontal straight line of y=0) is the insertion loss curve of the matching network. Both loss indicators are ideal and meet the engineering design requirements.

[0032] Example 2

[0033] Figure 5 This is a schematic diagram of the shortwave impedance matching device in this embodiment.

[0034] Compared with Example 1, the shortwave impedance matching device in this example differs in that: Figure 5 As shown, the impedance of the output resistor 220 is three times that of the input resistor 210. Four coaxial lines are provided between the input resistor 210 and the output resistor 220, and each of the four coaxial lines is nested with a magnetic ring 110.

[0035] The output terminal of the input resistor 210 is connected to the beginning of the inner conductor 120 of the first coaxial line 310, the beginning of the inner conductor 120 of the second coaxial line 320, and the beginning of the inner conductor 120 of the fourth coaxial line 340, respectively; the input terminal of the output resistor 220 is connected to the end of the inner conductor 120 of the first coaxial line 310 and the end of the inner conductor 120 of the third coaxial line 330, respectively; the beginning of the outer conductor 140 of the first coaxial line 310 is connected to the beginning of the outer conductor 140 of the second coaxial line 320; the end of the outer conductor 140 of the first coaxial line 310 is connected to the end of the inner conductor 120 of the second coaxial line 320; the second coaxial line 340... The first end of the outer conductor 140 of the axis 320 is connected to the first end of the inner conductor 120 of the third coaxial line 330; the first end of the outer conductor 140 of the third coaxial line 330 is connected to the first end of the outer conductor 140 of the fourth coaxial line 340; the tail ends of the outer conductor 140 of the second coaxial line 320, the tail ends of the outer conductor 140 of the third coaxial line 330, and the tail ends of the inner conductor 120 of the fourth coaxial line 340 are connected; the first and tail ends of the outer conductor 140 of the fourth coaxial line 340 are both grounded; the impedance of the first coaxial line 310, the second coaxial line 320, the third coaxial line 330, and the fourth coaxial line 340 is equal to the impedance of the output resistor 220.

[0036] One optional impedance parameter setting is as follows: the input resistor 210 has an impedance value of 16.7 ohms, and the first coaxial cable 310, the second coaxial cable 320, the third coaxial cable 330, the fourth coaxial cable 340 and the output resistor 220 all have an impedance value of 50 ohms.

[0037] Example 3

[0038] Figure 6 This is a schematic diagram of the shortwave impedance matching device in this embodiment.

[0039] Compared with Example 1, the shortwave impedance matching device in this example differs in that: Figure 6 As shown, the impedance of the output resistor 220 is 4 times the impedance of the input resistor 210. Two coaxial lines are provided between the input resistor 210 and the output resistor 220, with only the first coaxial line 310 having a magnetic ring 110 nested outside.

[0040] The output terminal of the input resistor 210 is connected to the beginning of the inner conductor 120 of the first coaxial line 310 and the beginning of the inner conductor 120 of the second coaxial line 320, respectively; the input terminal of the output resistor 220 is connected to the end of the inner conductor 120 of the first coaxial line 310; the beginning of the outer conductor 140 of the first coaxial line 310 is connected to the beginning of the outer conductor 140 of the second coaxial line 320; the end of the outer conductor 140 of the first coaxial line 310 is connected to the end of the inner conductor 120 of the second coaxial line 320; both the beginning and end of the outer conductor 140 of the second coaxial line 320 are grounded; the impedance of the first coaxial line 310 and the second coaxial line 320 is equal to half the impedance of the output resistor 220.

[0041] One optional impedance parameter setting is as follows: the input resistor 210 has an impedance value of 12.5 ohms, the first coaxial cable 310 and the second coaxial cable 320 have an impedance value of 25 ohms, and the output resistor 220 has an impedance value of 50 ohms.

[0042] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the above description of this utility model without inventive effort should fall within the protection scope of this utility model.

Claims

1. A shortwave impedance matching circuit for impedance transformation between an input resistor (210) and an output resistor (220) with different impedances, characterized in that: It includes at least two coaxial lines disposed between the input resistor (210) and the output resistor (220); at least one of the at least two coaxial lines has a magnetic ring (110) nested on its outside; the coaxial line includes an inner conductor (120), an insulating layer (130) and an outer conductor (140) connected by the inner and outer nesting.

2. The shortwave impedance matching device as described in claim 1, characterized in that: The input resistor (210) is located at the input terminal of the shortwave impedance matching device, and the output resistor (220) is located at the output terminal of the shortwave impedance matching device; the impedance of the output resistor (220) is 2, 3 or 4 times the impedance of the input resistor (210).

3. The shortwave impedance matching device as described in claim 2, characterized in that: When the impedance of the output resistor (220) is twice the impedance of the input resistor (210), two coaxial lines are provided between the input resistor (210) and the output resistor (220), and a magnetic ring (110) is nested outside the two coaxial lines. The output terminal of the input resistor (210) is connected to the beginning of the inner conductor (120) of the first coaxial line (310), the beginning of the inner conductor (120) of the second coaxial line (320), and the end of the outer conductor (140) of the second coaxial line (320), respectively. The input terminal of the output resistor (220) is connected to the tail end of the inner conductor (120) of the first coaxial line (310) and the tail end of the inner conductor (120) of the second coaxial line (320), respectively. The first end of the outer conductor (140) of the first coaxial line (310) is grounded; the tail end of the outer conductor (140) of the first coaxial line (310) is connected to the first end of the outer conductor (140) of the second coaxial line (320); The impedance of the first coaxial line (310) and the second coaxial line (320) is equal to the impedance of the output resistor (220).

4. The shortwave impedance matching device as described in claim 2, characterized in that: When the impedance of the output resistor (220) is three times the impedance of the input resistor (210), four coaxial lines are provided between the input resistor (210) and the output resistor (220), and each of the four coaxial lines is nested with a magnetic ring (110). The output terminal of the input resistor (210) is connected to the first end of the inner conductor (120) of the first coaxial line (310), the first end of the inner conductor (120) of the second coaxial line (320), and the first end of the inner conductor (120) of the fourth coaxial line (340), respectively. The input terminal of the output resistor (220) is connected to the tail end of the inner conductor (120) of the first coaxial line (310) and the tail end of the inner conductor (120) of the third coaxial line (330), respectively. The first end of the outer conductor (140) of the first coaxial line (310) is connected to the first end of the outer conductor (140) of the second coaxial line (320); the last end of the outer conductor (140) of the first coaxial line (310) is connected to the last end of the inner conductor (120) of the second coaxial line (320); The first end of the outer conductor (140) of the second coaxial line (320) is connected to the first end of the inner conductor (120) of the third coaxial line (330); The first end of the outer conductor (140) of the third coaxial line (330) is connected to the first end of the outer conductor (140) of the fourth coaxial line (340); The tail end of the outer conductor (140) of the second coaxial line (320), the tail end of the outer conductor (140) of the third coaxial line (330), and the tail end of the inner conductor (120) of the fourth coaxial line (340) are connected; The first and last ends of the outer conductor (140) of the fourth coaxial line (340) are grounded; The impedances of the first coaxial line (310), the second coaxial line (320), the third coaxial line (330), and the fourth coaxial line (340) are equal to the impedance of the output resistor (220).

5. The shortwave impedance matching device as described in claim 2, characterized in that: When the impedance of the output resistor (220) is 4 times the impedance of the input resistor (210), two coaxial lines are provided between the input resistor (210) and the output resistor (220), and only the first coaxial line (310) is nested with a magnetic ring (110). The output terminal of the input resistor (210) is connected to the first end of the inner conductor (120) of the first coaxial line (310) and the first end of the inner conductor (120) of the second coaxial line (320), respectively; The input terminal of the output resistor (220) is connected to the tail end of the inner conductor (120) of the first coaxial line (310); The first end of the outer conductor (140) of the first coaxial line (310) is connected to the first end of the outer conductor (140) of the second coaxial line (320); the last end of the outer conductor (140) of the first coaxial line (310) is connected to the last end of the inner conductor (120) of the second coaxial line (320). The outer conductor (140) of the second coaxial line (320) is grounded at both the beginning and end; The impedance of the first coaxial line (310) and the second coaxial line (320) is equal to half the impedance of the output resistor (220).

Images