CN115133248A - Broadband negative group time delay microwave circuit based on laminated coupling patch - Google Patents

Abstract

The invention provides a broadband negative group time delay microwave circuit based on a laminated coupling patch, which comprises: the device comprises a coupling patch, a transmission line, a dielectric plate, a metal floor, a supporting material, an input connector and an output connector; wherein: the dielectric plate comprises a lower dielectric plate and an upper dielectric plate; the coupling patches comprise a lower coupling patch and an upper coupling patch; the lower layer coupling patch is arranged on the upper surface of the lower layer dielectric slab, and the upper layer coupling patch is arranged on the lower surface of the upper layer dielectric slab; the transmission line is arranged on the upper surface of the lower dielectric slab; the metal floor is arranged on the lower surface of the lower medium plate; the lower dielectric plate and the upper dielectric plate are fixed together through a support material; the inner conductor of the input connector is connected with the transmission line, and the outer conductor of the input connector is connected with the metal floor; the inner conductor of the output connector is connected with the transmission line, and the outer conductor of the output connector is connected with the metal floor. The technical scheme of the invention solves the technical problem of large insertion loss caused by a cascading method while realizing broadband negative group delay.

Description

A Broadband Negative Group Delay Microwave Circuit Based on Laminated Coupling Patches

technical field

The present invention relates to the technical field of microwave circuits, in particular, to a broadband negative group delay microwave circuit based on laminated coupling patches.

Background technique

Group delay distortion is one of the challenging problems in circuits or systems. It will introduce intersymbol interference and distort the signal. Therefore, the delay equalization technology based on negative group delay microwave circuits emerges as the times require. Many scholars have carried out research on high-performance negative group delay microwave circuits. In the communication system, the linearity of the amplifier is an important index that affects the system performance. The emergence of the feedforward amplifier makes the problem of linearity relatively easy, but its disadvantage is that the delay line used is too large, which directly affects the improvement of the overall system integration, and the negative group delay microwave circuit is used instead of the delay line. Timeline can effectively solve this problem. In the broadband navigation system, the distortion of the group delay will lead to the distortion of the correlation peak, and the distortion of the correlation peak will make it difficult for the correlator to determine the true position of the main peak of the correlation peak, that is, the center of the sampling point of the correlator may not be the real time of arrival of the signal , resulting in a ranging bias. Eliminating the group delay deviation or reducing its impact on ranging is an unavoidable technical problem in realizing high-precision navigation. The negative group delay microwave circuit can balance the group delay characteristics, thereby improving the positioning accuracy of the broadband satellite navigation system.

With the development of wireless communication technology, more and more new communication standards are applied, and microwave equipment that supports broadband operation is indispensable. The working bandwidth of microwave circuits directly affects the compatibility of microwave equipment for broadband communications. At present, the usual method to realize a broadband negative group delay circuit is to design a single-frequency negative group delay circuit, then change its center frequency, and finally combine two negative group delay circuits with close center frequencies to realize broadband. Function. However, this method needs to be cascaded, which will increase the insertion loss and circuit size of the negative group delay circuit, which is not conducive to circuit integration. Therefore, a small wideband negative group delay circuit with low loss is very necessary for the development of modern wireless communication systems.

SUMMARY OF THE INVENTION

According to the above proposal, in order to solve the technical problem of large insertion loss caused by the cascading method while realizing the broadband negative group delay, the present invention provides a broadband negative group delay microwave circuit based on stacked coupling patches. The invention realizes the wideband negative group delay without needing lumped elements such as RLC resonators and without cascading operation, and has the characteristics of low insertion loss and simple circuit structure.

The technical means adopted in the present invention are as follows:

A broadband negative group delay microwave circuit based on a laminated coupling patch, comprising: a coupling patch, a transmission line, a dielectric plate, a metal floor, a supporting material, an input connector and an output connector; wherein:

The dielectric board includes a lower dielectric board and an upper dielectric board;

The coupling patch includes a lower-layer coupling patch and an upper-layer coupling patch; the lower-layer coupling patch is arranged on the upper surface of the lower-layer dielectric plate, and the upper-layer coupling patch is arranged on the lower surface of the upper-layer dielectric plate;

The transmission line is arranged on the upper surface of the lower dielectric plate;

The metal floor is arranged on the lower surface of the lower dielectric board;

Support material includes support material I and support material II;

The lower dielectric board and the upper dielectric board are fixed together by supporting materials;

The inner conductor of the input connector is connected with the transmission line, the outer conductor of the input connector is connected with the metal floor; the inner conductor of the output connector is connected with the transmission line, and the outer conductor of the output connector is connected with the metal floor.

Further, the lower-layer coupling patch and the upper-layer coupling patch are both square patches and have the same size.

Further, the supporting material I and the supporting material II are respectively disposed between the lower dielectric plate and the upper dielectric plate, and are distributed at both ends between the lower dielectric plate and the upper dielectric plate.

Further, the heights of the support material I and the support material II are the same and can be adjusted, and the negative group delay bandwidth of the negative group delay microwave circuit can be adjusted by adjusting the heights of the support material I and the support material II. .

Further, the distance between the lower coupling patch and the transmission line can be adjusted, and the negative group delay value at the center frequency can be adjusted by adjusting the distance between the lower coupling patch and the transmission line.

Compared with the prior art, the present invention has the following advantages:

1. The broadband negative group delay microwave circuit based on the laminated coupling patch provided by the present invention can realize the broadband negative group delay and at the same time solve the problem of large insertion loss caused by the cascade method.

2. The broadband negative group delay microwave circuit based on the laminated coupling patch has the advantages of low insertion loss, wide negative group delay bandwidth, simple circuit structure, and simple adjustment method.

Based on the above reasons, the present invention can be widely promoted in the fields of microwave circuits and systems.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a broadband negative group delay microwave circuit based on a laminated coupling patch according to the present invention.

FIG. 2 is a top view of the broadband negative group delay microwave circuit based on the laminated coupling patch of the present invention.

FIG. 3 is a side view of the broadband negative group delay microwave circuit based on the laminated coupling patch of the present invention.

FIG. 4 is a group delay curve diagram of the broadband negative group delay microwave circuit based on the laminated coupling patch of the present invention.

FIG. 5 is an S-parameter amplitude curve diagram of the broadband negative group delay microwave circuit based on the laminated coupling patch of the present invention.

In the figure: 1, coupling patch; 11, lower coupling patch; 12, upper coupling patch; 2, transmission line; 3, dielectric board; 31, lower dielectric board; 32, upper dielectric board; 4, metal floor; 5 51. Supporting material I; 52. Supporting material II; 6. Input connector; 7. Output connector.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise. Meanwhile, it should be understood that, for convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and these orientation words do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as a limitation on the scope of protection of the present invention: the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under its device or structure". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of the present invention.

As shown in Figures 1-3, the present invention provides a broadband negative group delay microwave circuit based on laminated coupling patches, including: coupling patch 1, transmission line 2, dielectric plate 3, metal floor 4, support material 5 , input connector 6 and output connector 7; where:

The dielectric board 3 includes a lower dielectric board 31 and an upper dielectric board 32;

The coupling patch 1 includes a lower-layer coupling patch 11 and an upper-layer coupling patch 12; the lower-layer coupling patch 11 is arranged on the upper surface of the lower-layer dielectric plate 31, and the upper-layer coupling patch 12 is arranged on the lower surface of the upper-layer dielectric plate 32;

The transmission line 2 is arranged on the upper surface of the lower dielectric plate 31;

The metal floor 4 is arranged on the lower surface of the lower dielectric board 31;

Support material 5 includes support material I51 and support material II52;

The lower dielectric board 31 and the upper dielectric board 32 are fixed together by the supporting material 5;

The inner conductor of the input connector 6 is connected with the transmission line 2, and the outer conductor of the input connector 6 is connected with the metal floor 4; the inner conductor of the output connector 7 is connected with the transmission line 2, and the outer conductor of the output connector 7 is connected with the metal floor 4 phase connections.

During specific implementation, as a preferred embodiment of the present invention, the lower-layer coupling patch 11 and the upper-layer coupling patch 12 are both square patches and have the same size.

In specific implementation, as a preferred embodiment of the present invention, the supporting material I51 and the supporting material II52 are respectively disposed between the lower dielectric plate 31 and the upper dielectric plate 32, and are distributed on the lower dielectric plate 31 and the upper dielectric plate 32 the ends in between. In this embodiment, the supporting material I51 and the supporting material II52 are both nylon materials.

In specific implementation, as a preferred embodiment of the present invention, the heights of the supporting material I51 and the supporting material II52 are the same and adjustable, and the negative group can be adjusted by adjusting the heights of the supporting material I51 and the supporting material II52 Negative group delay bandwidth of microwave circuits. In this embodiment, when the heights of the supporting material I51 and the supporting material II52 are respectively adjusted to 2 mm, the negative group delay bandwidth of the negative group delay microwave circuit is adjusted to 112 MHz.

During specific implementation, as a preferred embodiment of the present invention, the distance between the lower coupling patch 11 and the transmission line 2 can be adjusted, and the negative group time at the center frequency can be adjusted by adjusting the distance between the lower coupling patch 11 and the transmission line 2 extended value. In this embodiment, when the distance between the lower-layer coupling patch 11 and the transmission line 2 is adjusted to 0.35 mm, the negative group delay value at the center frequency is adjusted to -0.51 ns.

Example

In this embodiment, a broadband negative group delay microwave circuit based on stacked coupling patches is listed, and the case where the center operating frequency is 2.45 GHz is described. As shown in FIG. 4 , the group delay value of the broadband negative group delay microwave circuit based on the laminated coupling patch provided by the present invention is -0.51ns at the operating frequency of 2.45GHz; in the frequency range of 2.393GHz to 2.505GHz, The group delays are all negative values, and the negative group delay bandwidth is 112MHz (the relative bandwidth is 4.7%). As shown in FIG. 5 , the broadband negative group delay microwave circuit based on the laminated coupling patch provided by the present invention has an insertion loss of less than 4.3dB in the working frequency range of the negative group delay, and the return loss of the input and output ports is greater than 10.0dB. It is illustrated that the broadband negative group delay microwave circuit based on the laminated coupling patch provided by the present invention can realize the broadband negative group delay characteristic, and meanwhile has low insertion loss and good port matching characteristics.

To sum up, the broadband negative group delay microwave circuit based on the laminated coupling patch provided by the present invention realizes the broadband negative group delay characteristics, and has the characteristics of low insertion loss, large relative bandwidth, etc., and is very suitable for various applications. RF microwave system.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (5)

1. A broadband negative group delay microwave circuit based on a laminated coupling patch, characterized in that, comprising: a coupling patch (1), a transmission line (2), a dielectric plate (3), a metal floor (4), a support material (5), input connector (6) and output connector (7); wherein: The dielectric board (3) includes a lower dielectric board (31) and an upper dielectric board (32); The coupling patch (1) includes a lower-layer coupling patch (11) and an upper-layer coupling patch (12); the lower-layer coupling patch (11) is arranged on the upper surface of the lower-layer dielectric plate (31), and the upper-layer coupling patch (12) is arranged on the lower surface of the upper dielectric plate (32); The transmission line (2) is arranged on the upper surface of the lower dielectric plate (31); The metal floor (4) is arranged on the lower surface of the lower dielectric plate (31); The supporting material (5) includes a supporting material I (51) and a supporting material II (52); The lower dielectric board (31) and the upper dielectric board (32) are fixed together by a supporting material (5); The inner conductor of the input connector (6) is connected with the transmission line (2), the outer conductor of the input connector (6) is connected with the metal floor (4); the inner conductor of the output connector (7) is connected with the transmission line (2) Connection, the outer conductor of the output connector (7) is connected to the metal floor (4). 2. The broadband negative group delay microwave circuit based on laminated coupling patches according to claim 1, wherein the lower coupling patch (11) and the upper coupling patch (12) are both square patches , and are of equal size. 3. The broadband negative group delay microwave circuit based on the laminated coupling patch according to claim 1, wherein the supporting material I (51) and the supporting material II (52) are respectively arranged in the lower medium between the board (31) and the upper dielectric board (32), and distributed at both ends between the lower dielectric board (31) and the upper dielectric board (32). 4. The broadband negative group delay microwave circuit based on the laminated coupling patch according to claim 1, wherein the support material I (51) and the support material II (52) have the same height and can be The adjustment is to adjust the negative group delay bandwidth of the negative group delay microwave circuit by adjusting the heights of the support material I (51) and the support material II (52). 5 . The broadband negative group delay microwave circuit based on the laminated coupling patch according to claim 1 , wherein the distance between the lower coupling patch (11) and the transmission line (2) is adjustable, and by adjusting all the The distance between the lower coupling patch (11) and the transmission line (2) is adjusted so as to adjust the negative group delay value at the center frequency.

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