CN117832799A - Impedance tuner - Google Patents

Abstract

The application discloses an impedance tuner. The impedance tuner includes: a base on which a center conductor, a chute, and a probe slider are constructed; a central conductor which is spiral as a whole; a probe slider configured to move within the runner to adjust the impedance by changing a relative position between the probe slider and the center conductor. According to the technical scheme, the central conductor is designed into a spiral shape, so that the three-dimensional space of the impedance resonator can be better utilized, the length of the central conductor can be effectively reduced, the integration level is higher, the tuning range is larger, the tuning precision is higher, and the processing difficulty is lower.

Description

Impedance tuner

Technical Field

The present application relates to the technical field of semiconductor materials, and in particular to an impedance tuner.

Background

An impedance tuner is an electronic device for adjusting the input or output impedance of a circuit or antenna to achieve its best performance or to address impedance mismatch between different circuits. When the impedances of the different circuits or components are not matched, signal reflection, power loss and performance degradation are caused, and matching the impedance means matching the source impedance with the load impedance, so that efficient performance of signal transmission in the electronic circuit and the communication system can be ensured by maximizing energy transmission, and thus, the impedance tuner is generated.

The impedance tuner is usually composed of a central conductor, a transmission line, one or more matching probes, a control motor (or a mechanical sliding rail), a packaging structure and the like, and the principle is that the circuit is mismatched by adjusting the horizontal and vertical positions of the matching probes in the impedance tuner, and the reflection coefficient of the circuit is changed, so that the impedance value is changed, the aim of changing the equivalent load impedance is fulfilled, and the tested device and the load end are completely matched.

The application background of the impedance tuner is wide, and mainly comprises the following fields: communication system: in wireless communication, an impedance tuner is used to ensure impedance matching between an antenna and a radio frequency circuit, so as to maximize signal transmission efficiency and improve communication quality and coverage. Radio frequency circuit design: in radio frequency circuits, impedance tuners are used to handle impedance mismatch between different circuit elements to ensure lossless transmission of signals and to reduce the impact of signal reflections on system performance. Design of the power amplifier: impedance tuners play a critical role in amplifier design and ensure impedance matching between the amplifier and its surrounding circuitry and components, thereby improving amplifier performance, stability and signal quality, and reducing signal reflection losses to meet the requirements of a particular application. In general, impedance tuners are widely used in various electronic fields, which are helpful for optimizing the performance of circuits and antennas, improving signal transmission efficiency, and reducing reflection loss, thereby meeting the demands of different application fields.

Disclosure of Invention

[ problem to be solved ]

In view of this, the present application provides an impedance tuner, which can improve the integration level of the structure and expand the tuning range.

[ technical solution ]

The present application provides an impedance tuner comprising:

a base on which a center conductor, a chute, and a probe slider are constructed;

a central conductor which is spiral as a whole;

a probe slide configured to move within the chute to adjust impedance by changing a relative position between the probe slide and a center conductor.

Optionally, the spiral radius of the central conductor is 5cm and the pitch is 2cm.

Optionally, the base is housed within an electronic conductor package.

Optionally, the base is made of an electronic packaging material.

Optionally, the central conductor is embedded through a central conductor packaging structure arranged in the base.

Optionally, the whole spout is spiral, the spiral axis of spout is nonparallel with the spiral axis of center conductor.

Optionally, the package of the center conductor is a coaxial slotting structure or a metal plate wire structure, and when the coaxial slotting structure is adopted, a metal plate can be omitted.

Optionally, a driving mechanism for driving the probe slide block to slide is further included.

Optionally, the probe slider is made of metal.

[ beneficial effects of the present application ]

According to the technical scheme disclosed by the application, the central conductor is designed into a three-dimensional spiral structure, so that the three-dimensional space of the impedance resonator can be better utilized, the length of the central conductor can be effectively reduced, the integration level is higher, the tuning range is larger, the tuning precision is higher, and the processing difficulty is lower.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a perspective view of an impedance resonator according to an embodiment of the present application;

FIG. 2 is a top view of an impedance resonator as disclosed in an embodiment of the present application;

FIG. 3 is a front view of a metal plate wire structure of an impedance resonator as disclosed in an embodiment of the present application;

fig. 4 is a cross-sectional view of a perspective view of a center conductor and a center conductor package structure portion of an impedance resonator as disclosed in an embodiment of the present application.

Fig. 5 is a top view of a center conductor, a center conductor package structure, and a probe slider portion of an impedance resonator as disclosed in embodiments of the present application.

Wherein, the above element symbols are as follows:

110-a base; 110 a-a chute; 110 b-a center conductor package structure; 120-a center conductor; 130-probe slide.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

[ inventive creation Process ]

Some of the more typical prior impedance tuners are now listed. The prior art discloses an impedance tuner in which the coaxial line is slotted and a metal plate line structure is typically comprised of 50 ohm transmission line, matching probe(s), metal diaphragm, stepper motor (or mechanical slide rail) in horizontal and vertical directions, etc. The position of the matching probe is typically controlled manually by a mechanical slide or by a high precision stepper motor. The related art may have the following to be improved, for example: the performance of the impedance tuner adopting the structure on impedance tuning has geometric frequency response, the operating frequency bandwidth of the tuner can be enlarged if a plurality of matching probes are used, the phase of S11 can be changed if the horizontal position of the probes is changed, and the amplitude of S11 can be changed if the vertical position of the probes is changed. In order to ensure phase consistency, the length of the center conductor 120 needs to satisfy one full wavelength at the tuning frequency, but since the electromagnetic wave is longer at a lower frequency, the horizontal adjustment range of the center conductor 120 required for adjusting the low frequency is larger, which results in an increase in the transmission line length of the impedance tuner, an excessive length-to-width ratio, a decrease in stability and portability, and the use of a test platform is not utilized. If a shorter transmission line is selected to ensure miniaturization and stability of the tuner, the tuning range of the tuner is limited. Therefore, the structure has the characteristics of simple structure, long length, small adjustment bandwidth and poor stability.

In the second prior related art, an impedance tuner is disclosed, in the technical scheme, a circuit is mismatched by adjusting the position of a matching probe to obtain a required impedance, and the difference is that a core transmission line adopts a folding structure and a telescopic movable structure, so that the length of a tuner is reduced, and the tunable range of the tuner is expanded. The length of the central conductor 120 can be increased through the adjustable central conductor 120, the horizontal position of the probe can be changed, and the vertical position of the matched probe can be adjusted through the handle, so that the aim of changing the impedance is fulfilled. The related art may have the following to be improved, for example: (1) The chamfer is many, and mechanical strength is poor, and scalable physical structure is unstable. (2) Poor tuning precision, inconsistent diameters of inner and outer conductors at the telescopic structure, discontinuous reflection coefficient and instability; (3) The structure is complex, the processing difficulty is high, the cost is high, and the mechanical structure is not as simple as the technical scheme one.

The present inventors have found, through a careful study, that a change is made to the physical structure achieved by the prior impedance tuner, changing the horizontal straight center conductor 120 and the horizontal right angle folded telescoping center conductor 120 of the prior art to a solid helical center conductor 120. The three-dimensional spiral structure can better utilize the three-dimensional space of the impedance resonator, effectively reduce the length of the center conductor 120, and has higher integration level and larger tuning range. Based on this, the present invention has been created.

[ impedance tuner ]

Referring to fig. 1 and 2, an impedance tuner provided in an embodiment of the present application includes:

a base 110, the base 110 being configured with a center conductor 120, a chute 110a, and a probe slider 130;

a center conductor 120 having a spiral shape as a whole;

a probe slider 130 configured to move within the chute 110a to adjust the impedance by changing the relative position between the probe slider 130 and the center conductor 120.

[ spiral shape of center conductor 120 ]

In order to more intuitively and clearly facilitate understanding the expected effect achieved by the spiral shape of the center conductor 120, the spiral shape of the center conductor 120 of the present application is analyzed in detail in comparison with the prior art as previously described, specifically: taking the tuning frequency of 300MHz as an example, the wavelength is 100cm, in order to ensure the impedance tuning at this frequency, the length of the center conductor 120 of the tuner under the conventional straight center conductor 120 scheme needs to reach a full wavelength, that is, a length of 100cm, and the compact structure of the center conductor 120 adopting the stereo spiral structure can greatly reduce the length of the center conductor 120 to reach the same tuning range. For example, when the spiral radius is 5cm, the vertical distance (i.e. the pitch) between the conductors is 2cm, the central conductor 120 can reach 100cm only by winding three more times and the vertical length is not more than 6 cm.

The spiral shape of the center conductor 120 of the present application, in comparison with the prior art II referred to above, is analyzed in detail: the three-dimensional spiral structure and the folded structure in the second prior art have obvious advantages for reducing the length of the central conductor 120, namely, the length of the central conductor 120 is reduced through a more compact structure, but the folded structure in the second technical scheme has more physical chamfer angles, and simultaneously, the telescopic inner conductor brings performance discontinuity, mechanical structure instability and processing difficulty. Compared with the prior art, the three-dimensional spiral structure has the advantages of better stability, higher tuning precision and lower processing difficulty.

As an exemplary form, the spiral radius of the center conductor 120 is 5cm and the pitch is 2cm, although other radius, pitch spiral dimension parameters may be used.

[ base 110 ]

To enable mounting or housing of base 110, an electronic conductor package may be configured.

Accordingly, the electronic conductor package accommodates the base 110, so as to prevent the electromagnetic signal generated by the central conductor 120 from affecting the outside or being interfered by the outside electromagnetic interference.

As an embodiment of the material of the base 110, the base 110 may be made of an electronic packaging material.

It is easy to understand that the base 110 made of the electronic packaging material not only improves the convenience of mass-producing the base 110, but also reduces the influence of the electromagnetic signal generated by the center conductor 120 on the outside or the external electromagnetic interference.

In the case that the base 110 is made of an electronic packaging material, the central conductor 120 is embedded by a central conductor packaging structure 110b formed in the base 110.

Here, the central conductor 120 is embedded by the central conductor packaging structure 110b, so that the assembly efficiency of the central conductor 120 and the base 110 is improved.

As an alternative implementation of the center conductor package structure 110b, the center conductor 120 may also be assembled with the base 110 by a sheet metal wire like structure.

[ sliding chute 110a ]

The runner 110a may be in a form that provides the probe slide 130 with a split motion in either a "horizontal" or "vertical" direction relative to the center conductor 120. Referring to fig. 3-5, as a preferred implementation, the sliding groove 110a is in a spiral shape as a whole, and the spiral axis of the sliding groove 110a is not parallel to the spiral axis of the central conductor 120.

In this way, the screw axis of the chute 110a is not parallel to the screw axis of the central conductor 120, so that the motion gesture of the probe slider 130 and the extension of the central conductor 120 can be ensured to present an 'inclined intersecting' gesture, and thus, two partial motions along parallel (horizontal) or normal (vertical) can be generated at the same time relative to the central conductor 120, and the flexibility of adjusting impedance is improved.

Of course, it is easily conceivable that the spiral shape of the chute 110a may be replaced with a straight shape that is not parallel or perpendicular to the screw axis of the center conductor 120 without significantly affecting the implementation effect.

[ separator ]

As a preferred implementation, the outer periphery of the central conductor 120 is provided with a metal spacer (not shown).

Thus, the spacer plate can be better adapted to the assembly of the center conductor 120 and the base 110 by the sheet metal wire structure.

[ other parts ]

To enable sliding of the drive probe slider 130, a drive mechanism (not shown) may be employed, either passive mechanical control or active motor control, etc., the drive mechanism being a stepper motor.

In the case of a stepping motor, a control unit (not shown in the drawings) for controlling the stepping motor may be provided to control the traveling direction or traveling distance of the stepping motor.

The control unit can be widely used as an MCU or a PLC or a singlechip or a servo controller carrying a control program.

The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.

Claims (9)

1. An impedance tuner, comprising:

a base on which a center conductor, a chute, and a probe slider are constructed;

a central conductor which is spiral as a whole;

a probe slide configured to move within the chute to adjust impedance by changing a relative position between the probe slide and a center conductor.

2. The impedance tuner of claim 1, wherein the spiral radius of the center conductor is 5cm and the pitch is 2cm.

3. The impedance tuner of claim 1, wherein the base is housed within an electronic conductor package.

4. The impedance tuner of claim 1, wherein the base is made of an electronic packaging material.

5. The impedance tuner of claim 4, wherein the center conductor is embedded by a center conductor package structure formed in the base.

6. The impedance tuner of claim 1, wherein the chute is generally helical, and the helical axis of the chute is non-parallel to the helical axis of the center conductor.

7. The impedance tuner of claim 1, wherein the packaging of the center conductor is a coaxial slotted structure or a sheet metal wire structure.

8. The impedance tuner of claim 1, further comprising a drive mechanism for driving the probe slider to slide.

9. The impedance tuner of claim 1, wherein the probe slider is a metallic material.