CN114256576B - D-band Tesla node coupling structure - Google Patents

Abstract

The invention relates to microwave technology, in particular to a D-band Tesla junction coupling structure. The present invention only adopts one stripline cavity structure, and by combining the traditional stripline with the Tesla junction, the speciality of this structure is used, that is, the phase difference between the two nodes of the electromagnetic wave reaching the Tesla junction is different, and the The change of the central conduction band structure of the strip line can achieve the filtering effect of the band rejection, which has the advantage of small size. When the distance between the three junctions is different, that is, the coupling between the junctions is different, the filtering effect presented is different. It provides a new way to solve the problem that the existing coupling structure is relatively large and unfavorable for integration.

Description

A D-band Tesla Junction Coupling Structure

technical field

The invention relates to microwave technology, in particular to a D-band Tesla junction coupling structure.

Background technique

The D-band is: 110-170GHz, located in the terahertz band. Striplines are widely used in the design of filters as microwave transmission lines. The filtering effect of the traditional stripline structure is achieved by the coupling between the cavity and the cavity, or the coupling between the central conduction bands, so the overall volume is relatively large, which is not conducive to the small volume requirements of the current industry integration.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems or deficiencies, in order to solve the problem that the existing coupling structure is relatively bulky and unfavorable for integration, the present invention provides a D-band Tesla junction coupling structure, which is a stripline coupling structure.

The technical scheme of the present invention is as follows:

A D-band Tesla junction coupling structure comprises: a high dielectric constant dielectric substrate (9-14), a metal conduction band and a Tesla junction.

The dielectric constant of the dielectric substrate is 9-14.

The metal conduction band (copper) is arranged at the center position along the propagation direction of the electromagnetic wave in the dielectric substrate;

There are three Tesla junctions. The three Tesla junctions are the same and are located on the same side of the metal conduction band and are connected to the metal conduction band. The material of the Tesla junction is the same as that of the metal conduction band; The positional relationship is as follows: No. 1 knot is located in the middle of the metal conduction band, with No. 1 knot as the benchmark, move the same distance d3 back and forth along the length of the metal conduction strip to obtain No. 2 and No. 3 knots, d3 = 0.7 ~ 0.96mm.

The inner and outer sides of the Tesla knot are formed by connecting an arc edge and a semi-circular arc of the Leroy triangle; one end of the arc edge of the Leroy triangle is connected to one side of the metal conduction band, and the other end is connected to one end of the semi-circular arc. The other end of the semicircular arc is connected to the side of the metal conduction band, and the arc edge of the Leroy triangle and the side of the metal conduction band connected to the semicircular arc are the same side, thus forming the inner and outer arcs of the Tesla junction; The center points of the Leroy triangles of the inner arc and the outer arc of the tie-knot coincide with the center points of the sides of the metal conduction band where they are located. In the inner and outer arcs of the Tesla knot, half of the side length of the equilateral triangle corresponding to the Leroy's triangle is the diameter of the corresponding semicircular arc. The half of the equilateral triangle vertical line corresponding to the outer arc of the Tesla knot is L1, and the half of the equilateral triangle vertical line corresponding to the inner arc is L2, L1=0.28～0.3mm, L2=0.19～0.22mm.

The design method of the above-mentioned D-band Tesla junction coupling structure includes the following steps:

Step 1. Design a traditional stripline structure suitable for D-band transmission, including the dielectric constant ε of the dielectric substrate, the width w1, the thickness t1, the width w of the central metal conduction band, and the thickness t.

Step 2. Build the No. 1 Tesla junction in the stripline structure designed in Step 1.

First, taking the midpoint of one side of the metal conduction band as the center point of the equilateral triangle, construct the outer arc of the Tesla knot, including an arc side and a semicircle of the Leroy triangle corresponding to the side length of the equilateral triangle, One end of the arc edge of the Leroy triangle is connected to one side of the metal conduction band, the other end is connected to one end of the semicircular arc, and the other end of the semicircular arc is connected to the side edge of the metal conduction band. The sides of the connected metal conduction band are the same side; and ensure that the center points of the Leroy triangle of the inner and outer arcs of the Tesla junction coincide, and the midpoint of the side of the metal conduction band where they are located; the outer side of the Tesla junction The half of the equilateral triangle vertical line corresponding to the arc is L1, and L1=0.28～0.3mm.

Then, by reducing the side length of the equilateral triangle to which the outer arc belongs, the dimensions of the Leroy triangle arc side and semicircle arc of the inner arc of the Tesla knot are obtained, so as to determine the size of the No. 1 Tesla knot; The half of the equilateral triangle vertical line corresponding to the inner arc is L2, and L2=0.19～0.22mm.

Step 3. Taking the No. 1 Tesla knot as the benchmark, move the same distance d3 back and forth along the length of the metal conduction band to obtain the No. 2 and No. 3 knots, d3=0.7～0.96mm.

Step 4. Adjust L1, L2 and/or d3 to optimize the overall parameter performance and ensure that the entire coupling structure exhibits a band-stop effect.

To sum up, the present invention only adopts a stripline cavity structure, and through the combination of traditional stripline and Tesla junction, the particularity of this structure is used, that is, electromagnetic waves reach the two nodes of Tesla junction. The phase difference is different, and the band-stop filtering effect is achieved through the change of the central conduction band structure of the strip line, which has the advantage of small size. When the distance between the three junctions is different, that is, the coupling between the junctions is different, the filtering effect presented is different. It provides a new way to solve the problem that the existing coupling structure is relatively large and unfavorable for integration.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of D-band Tesla junction coupling structure of the present invention;

Fig. 2 is the local parameter schematic diagram of the D-band Tesla junction coupling structure of the present invention;

3 is an s-parameter diagram corresponding to the band-stop effect of the D-band Tesla junction coupling structure of the embodiment;

4 is a s-parameter diagram corresponding to d3 of the D-band Tesla junction coupling structure of the embodiment being 0.7 mm;

5 is a s-parameter diagram corresponding to d3 of the D-band Tesla junction coupling structure of the embodiment being 0.82 mm;

FIG. 6 is an s-parameter diagram corresponding to the d3 of the D-band Tesla junction coupling structure of the embodiment being 0.92 mm.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

A design of a D-band Tesla junction coupling structure includes the following steps:

Step 1. Design a traditional stripline structure suitable for D-band transmission. Including the dielectric constant ε of the dielectric substrate, the width w1, the thickness t1, the width w of the central metal conduction band, and the thickness t. Finally, the dielectric constant ε=10, the width w1=1.6mm, the thickness t1=0.25mm, the width w=0.1mm and the thickness t=0.03mm of the dielectric substrate are finally determined. Since the width of the strip line limits the size of the Tesla knot loop, according to mathematical knowledge, the strip line length L=3mm is preliminarily determined.

Step 2. Add a No. 1 Tesla knot to the stripline designed in Step 1.

Specifically, the center point of the upper side of the metal conduction band is the center point of the equilateral triangle. For the convenience of modeling, the half of the vertical line of the equilateral triangle is used as the variable L1, and the vertical line is located on the upper side of the metal conduction band along the electromagnetic wave propagation direction. , so as to determine the size of the arc outside the No. 1 Tesla node, including an arc side and a semicircular arc of the Leroy triangle corresponding to the side length of the equilateral triangle, and one end of the arc side of the Leroy triangle is connected to a The side, the other end is connected to one end of the semi-circular arc, the other end of the semi-circular arc is connected to the side of the metal conduction band, and the arc edge of the Leroy triangle and the side of the metal conduction band connected to the semi-circle arc are the same side. And ensure that the center points of the Leroy triangle belonging to the inner and outer arcs of the Tesla knot coincide, and the center points of the sides of the metal conduction band where it is located. L1=0.28～0.3mm, the diameter d1 of the semicircular arc in the outer arc is half of the side length of the equilateral triangle.

Then, by changing L1, the arc sides of the Leroy triangle and the semicircular arc dimensions of the inner arc of Tesla knot 1 are obtained, thereby forming Tesla knot 1. Assume that the half of the vertical line of the equilateral triangle to which the arc inside the No. 1 Tesla knot belongs is L2, L2=0.19～0.22mm, and the diameter of the corresponding semicircle is d2.

Step 3. Taking the No. 1 Tesla knot as the benchmark, move the same distance d3 back and forth along the length of the metal conduction band to obtain the No. 2 and No. 3 Tesla knots, d3=0.7～0.96mm.

Step 4. Adjust L1, L2 and/or d3 to optimize the overall parameter performance and ensure that the entire coupling structure exhibits a band-stop effect. When it is finally determined that L1=0.28mm, L2=0.2mm, and d3=0.7-0.96mm, the coupling structure exhibits a band resistance effect, as shown in FIG. 3 .

Figures 4, 5, and 6 are S-parameter diagrams when L1=0.28mm, L2=0.2mm, and d3 is 0.7mm, 0.82mm, and 0.92mm, respectively.

It can be seen from the above-mentioned embodiments that the present invention realizes band-stop filtering by combining the traditional strip line with the Tesla junction, utilizing the particularity of this structure, that is, the electromagnetic waves have different phase differences between the two nodes of the Tesla junction. Effect. When the distance between the three junctions is different, that is, the coupling between the junctions is different, the filtering effect presented is different. It provides a new way to solve the problem that the existing coupling structure is relatively large and unfavorable for integration.

Claims (2)

1. a D-band Tesla junction coupling structure, is characterized in that: comprise dielectric substrate, metal conduction band and Tesla junction; The dielectric constant of the dielectric substrate is 9-14; The metal conduction band is arranged at the center position along the propagation direction of the electromagnetic wave in the dielectric substrate; There are three Tesla junctions, and the three Tesla junctions are the same, located on the same side of the metal conduction band and connected to the metal conduction band, and the material of the Tesla junction is the same as that of the metal conduction band; The positional relationship of the three Tesla knots is: No. 1 knot is located in the middle of the metal conduction band, taking No. 1 knot as the benchmark, move the same distance d3 back and forth along the length of the metal conduction band to obtain No. 2 and No. 3 knots, d3 = 0.7～0.96mm; The inner and outer sides of the Tesla knot are formed by connecting an arc edge and a semi-circular arc of the Leroy triangle; one end of the arc edge of the Leroy triangle is connected to one side of the metal conduction band, and the other end is connected to one end of the semi-circular arc. The other end of the semicircular arc is connected to the side of the metal conduction band, and the arc edge of the Leroy triangle and the side of the metal conduction band connected to the semicircular arc are the same side, thus forming the inner and outer arcs of the Tesla junction; The center points of the Lelot triangles of the inner and outer arcs of the pull knot coincide, and the center points of the sides of the metal conduction band where they are located; Half of the side length of the triangle is the diameter of the corresponding semicircular arc; half of the vertical line of the equilateral triangle corresponding to the outer arc of the Tesla knot is L1, and half of the vertical line of the equilateral triangle corresponding to the inner arc is L2, L1=0.28～0.3 mm, L2=0.19～0.22mm. 2. the design method of D-band Tesla junction coupling structure as claimed in claim 1, is characterized in that, comprises the following steps: Step 1. Design a traditional stripline structure suitable for D-band transmission, including the dielectric constant ε of the dielectric substrate, the width w1, the thickness t1, the width w of the central metal conduction band, and the thickness t; Step 2. Build No. 1 Tesla junction in the stripline structure designed in Step 1; First, taking the midpoint of one side of the metal conduction band as the center point of the equilateral triangle, construct the outer arc of the Tesla knot, including an arc side and a semicircle of the Leroy triangle corresponding to the side length of the equilateral triangle, One end of the arc edge of the Leroy triangle is connected to one side of the metal conduction band, the other end is connected to one end of the semicircular arc, and the other end of the semicircular arc is connected to the side edge of the metal conduction band. The sides of the connected metal conduction band are the same side; and ensure that the center points of the Leroy triangle of the inner and outer arcs of the Tesla junction coincide, and the midpoint of the side of the metal conduction band where they are located; the outer side of the Tesla junction The half of the equilateral triangle vertical line corresponding to the arc is L1, L1=0.28～0.3mm; Then, by reducing the side length of the equilateral triangle to which the outer arc belongs, the dimensions of the Leroy triangle arc side and semicircle arc of the inner arc of the Tesla knot are obtained, so as to determine the size of the No. 1 Tesla knot; The half of the equilateral triangle vertical line corresponding to the inner arc is L2, L2=0.19～0.22mm; Step 3. Taking the No. 1 Tesla knot as the benchmark, move the same distance d3 back and forth along the length of the metal conduction band to obtain the No. 2 and No. 3 knots, d3=0.7～0.96mm; Step 4. Adjust L1, L2 and/or d3 to optimize the overall parameter performance and ensure that the entire coupling structure exhibits a band-stop effect.

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