Substrate integrated notch mirror image dielectric waveguide transmission structure and array thereof

Abstract

The invention provides a substrate integrated trapped wave mirror image dielectric waveguide transmission structure and an array thereof, and belongs to the technical field of microwave engineering, the substrate integrated trapped wave mirror image dielectric waveguide transmission structure comprises a dielectric substrate, a metal ground plane and a metal plane which are attached to the lower surface of the dielectric substrate, and an air hole or an air groove which is formed in the direction of one side edge of the dielectric substrate, the dielectric substrate is provided with an air hole or an air groove, the air hole or the air groove divides the dielectric substrate into three parts which are dielectric blocks on the two sides and a dielectric strip in the middle, the metal plane is located on the upper surfaces of the dielectric blocks, and the metal plane and the metal ground plane are connected to form a common ground. Due to the integrated design, the dielectric waveguide transmission structure is simple and stable, low in loss and suitable for the manufacturing process of integrated planar circuit boards such as millimeter wave terahertz and the like for electromagnetic transmission of frequency bands such as millimeter wave terahertz and the like.

Description

Technical Field

[0001] The invention relates to the technical field of microwave engineering, and in particular to a substrate-integrated notch mirror dielectric waveguide transmission structure. Background Art

[0002] Dielectric waveguide is an important component of microwave technology and millimeter wave technology. As the medium for transmitting electromagnetic fields, dielectric waveguide has the characteristics of low loss and high efficiency, especially in the millimeter wave and terahertz frequency bands, its transmission performance is particularly outstanding. With the rapid development of modern communication technology, the performance requirements for microwave, millimeter wave and terahertz devices are increasing day by day, and dielectric waveguide devices are widely used due to their excellent performance.

[0003] The research background of dielectric waveguides involves many fields, including microwave and millimeter wave technology, communication technology, military fields such as radar and electronic warfare, and the development of new materials and new processes. With the continuous advancement of science and technology and the increasing demand for applications, the research on dielectric waveguides will continue to develop in depth, providing more advanced and efficient solutions for modern communications, military and other fields.

[0004] The traditional dielectric waveguide is a dielectric block and cannot be directly integrated into the circuit board. When the dielectric waveguide needs to be integrated into the circuit board, the dielectric waveguide needs to be processed separately and then assembled into the circuit board, which is not easy to achieve planar integration. In the prior art, the Chinese invention patent application with publication number CN107492714A, "Substrate integrated mirror dielectric waveguide leaky wave antenna based on ordinary PCB process", proposes wide transmission of the central dielectric band, and isolates the dielectric on both sides by punching holes to prevent energy leakage. However, the problem with this structure is that the exposed dielectric on both sides of the central transmission band will absorb electromagnetic waves and increase the transmission loss of the dielectric waveguide. Moreover, since the dielectric waveguide is not provided with a metal shield, when multiple dielectric waveguides form an array, the coupling between adjacent dielectric waveguides is large, which interferes with the transmission of electromagnetic waves. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to design a dielectric waveguide transmission structure which is simple, stable, easy to integrate and has low loss.

[0006] The present invention solves the above technical problems through the following technical solutions: a substrate-integrated notch mirror dielectric waveguide transmission structure, comprising a dielectric substrate, a metal ground plane and a metal plane attached to the lower surface of the dielectric substrate, air holes or air slots are provided along one side of the dielectric substrate, the air holes or air slots divide the dielectric substrate into three parts, namely dielectric blocks on both sides and a dielectric strip in the middle, the metal plane is located on the upper surface of the dielectric block, and the metal plane is connected to the metal ground plane to form a common ground.

[0007] Preferably, air holes are provided along one side of the dielectric substrate. The air holes are through holes penetrating the upper and lower surfaces of the dielectric substrate. The through holes are distributed in an array along one side of the dielectric substrate to form a through hole array.

[0008] Preferably, the metal plane and the metal ground plane are connected to form a common ground through a plurality of metallized through holes, and the plurality of metallized through holes are located on a side of the dielectric block opposite to the through hole array.

[0009] Preferably, the plurality of metallized through holes form a metal column array, and the metal column array is located outside the through hole array and parallel to the through hole array.

[0010] Preferably, the dielectric strip is located at the center of the dielectric substrate and is used to transmit electromagnetic wave signals.

[0011] Preferably, the metal planes on both sides are separated by dielectric strips and through-hole arrays, forming a common ground with the metallized through-holes and the metal ground plane.

[0012] Preferably, the through hole array is rows of through holes, and the through holes are circular holes or rectangular holes.

[0013] Preferably, an air slot is provided along one side of the dielectric substrate, and the metal plane and the metal ground plane are connected to form a common ground through an outer metal plane, and the outer metal plane is located on a side of the dielectric block opposite to the air slot.

[0014] Preferably, the metal planes on both sides are separated by dielectric strips and air slots to form a common ground with the outer metal plane and the metal ground plane.

[0015] The present invention also provides a substrate integrated notch mirror dielectric waveguide array, which is composed of the substrate integrated notch mirror dielectric waveguide transmission structure array arrangement.

[0016] The advantages provided by the present invention are:

[0017] 1. The present invention provides an air hole or air groove for isolation on the dielectric substrate. The air hole or air groove divides the dielectric substrate into three parts. The dielectric strip in the middle is used to transmit electromagnetic wave signals. The dielectric blocks on both sides play a supporting role. The metal ground plane is connected to the metal plane to form a common ground. Compared with the traditional dielectric waveguide, the dielectric waveguide transmission structure is easy to realize planar integration. The integrated design makes the dielectric waveguide transmission structure simple, stable and low-loss. It is suitable for the integrated planar circuit board manufacturing process of millimeter wave terahertz and other frequency bands, and is used as electromagnetic transmission in millimeter wave terahertz and other frequency bands.

[0018] 2. The present invention connects two metal planes on the upper surface of the dielectric block with a metal ground plane to form a common ground. When integrated with the manufacturing process of integrated planar circuit boards such as millimeter wave terahertz, other devices can be designed and placed on the metal plane.

[0019] 3. The present invention provides a metallized through hole or an outer metal plane. The metallized through hole plus the metal planes on both sides, or the outer metal plane plus the metal planes on both sides can form a shield to prevent the exposed medium from absorbing electromagnetic waves, so that when multiple dielectric waveguides are designed into an array, they can be more dense and the coupling between the dielectric waveguides is very small. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a substrate-integrated notch mirror dielectric waveguide transmission structure provided in Example 1 of the present invention;

[0021] Figure 2 A top view of a substrate-integrated notch mirror dielectric waveguide transmission structure provided in Embodiment 1 of the present invention;

[0022] Figure 3 Transmission and reflection coefficient curves of the substrate-integrated notch mirror dielectric waveguide transmission structure loaded with probe excitation provided in Example 1 of the present invention;

[0023] Figure 4 A schematic diagram of an ideal transmission structure of a substrate-integrated notch mirror dielectric waveguide provided in Example 2 of the present invention;

[0024] Figure 5 Transmission and reflection coefficient curves of the substrate-integrated notch mirror dielectric waveguide transmission structure loaded with probe excitation provided by Example 2 of the present invention;

[0025] Figure 6 A schematic diagram of an array of substrate-integrated notch mirror dielectric waveguide transmission structures provided by an embodiment of the present invention;

[0026] In the figure: 1 metal ground plane, 2 dielectric substrate, 3 metal plane, 4 through hole array, 5 metallized through hole, 6 dielectric strip, 11 outer metal plane, 12 air slot. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1 and Figure 2As shown, this embodiment provides a substrate-integrated notch mirror dielectric waveguide transmission structure, including a dielectric substrate 2, a metal ground plane 1 and a metal plane 3 attached to the lower surface of the dielectric substrate 2, a plurality of through holes penetrating the upper and lower surfaces of the dielectric substrate 2 are arranged in an array along a side edge direction of the dielectric substrate 2 to form a through hole array 4, the through hole array 4 divides the dielectric substrate 2 into three parts, namely dielectric blocks on both sides and a dielectric strip 6 in the middle, the metal plane 3 is located on the upper surface of the dielectric block, a plurality of metallized through holes 5 are arranged on a side of the dielectric block opposite to the through hole array 4, and the metallized through holes 5 are connected to the metal ground plane 1 and the metal plane 3 to form a common ground.

[0030] The plurality of metallized through holes 5 form a metal column array, which is located outside the through hole array 4 and parallel to the through hole array 4 .

[0031] The dielectric strip 6 is formed by the dielectric substrate 2 being separated by the through-hole array 4 . The dielectric strip 6 is located at the center of the dielectric substrate 2 and is used for electromagnetic wave signal transmission.

[0032] The dielectric substrate 2 plays a structural supporting role, and the dielectric blocks on both sides are also used for supporting. The upper surfaces of the dielectric blocks on both sides have metal planes 3, which are separated by dielectric strips 6 and through hole arrays 4, and form a common ground with metallized through holes 5 and metal ground plane 1.

[0033] The through hole array 4 is a row of through holes, which are small round holes or small rectangular holes, forming air holes that penetrate the upper and lower surfaces of the dielectric substrate 2 to play an isolation role.

[0034] Figure 3 The transmission and reflection coefficient curves of the substrate-integrated notch mirror dielectric waveguide transmission structure loaded with probe excitation are shown. The solid line is the reflection curve, and the dotted line is the transmission curve. By loading the excitation probes on both sides of the dielectric strip, the transmission and reflection characteristics of this transmission structure can be obtained, with a good transmission coefficient from 18.5GHz to 25GHz, an insertion loss of about 3dB, and a reflection coefficient of less than -10dB. The insertion loss is larger than that of the ideal structure, mainly because the semi-exposed probe is exposed to the air and through-holes, which will form partial electromagnetic leakage. The insertion loss can be reduced by adjusting the radius and hole spacing of the through-holes, and the loss can also be reduced and the transmission performance can be improved by optimizing the layout of the through-holes.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is that in this embodiment, an air groove is provided along one side of the dielectric substrate 2, and the air groove divides the dielectric substrate 2 into three parts. Figure 4As shown, the substrate-integrated notch mirror dielectric waveguide transmission structure of the present embodiment includes a dielectric substrate 2, a metal ground plane 1 and a metal plane 3 attached to the lower surface of the dielectric substrate 2, two air slots 12 are provided on the upper surface of the dielectric substrate 2 along one side of the dielectric substrate 2, the air slots 12 divide the dielectric substrate 2 into three parts, namely dielectric blocks on both sides and a dielectric strip 6 in the middle, the metal plane 3 is located on the upper surface of the dielectric block, an outer metal plane 11 is attached to the side of the dielectric block opposite to the air slot 12, and the outer metal plane 11 forms a common ground plane with the metal ground plane 1 and the metal plane 3.

[0037] The dielectric strip 6 is formed by the dielectric substrate 2 being separated by the air slot 12. The dielectric strip 6 is located at the center of the dielectric substrate 2 and is used for electromagnetic wave signal transmission. The air slot plays an isolating role, blocking the entire dielectric substrate. The metal planes 3 on both sides are separated by the dielectric strip 6 and the air slot, and form a common ground with the outer metal plane 11 and the metal ground plane 1.

[0038] Figure 5 The transmission and reflection coefficient curves of the substrate-integrated notch mirror dielectric waveguide transmission structure loaded with probe excitation are shown. The solid line is the reflection curve, and the dotted line is the transmission curve. Loading the excitation probe on both sides of the dielectric strip can obtain the transmission and reflection characteristics of this ideal transmission structure, with a good transmission coefficient from 18.5GHz to 25GHz, an insertion loss of about 2dB, and a reflection coefficient of less than -10dB. The large insertion loss comes from the semi-exposure of the probe in the air, which forms partial electromagnetic leakage.

[0039] The present invention provides air holes or air grooves for isolation on a dielectric substrate, and the air holes or air grooves divide the dielectric substrate into three parts. The dielectric strip in the middle is used to transmit electromagnetic wave signals, and the dielectric blocks on both sides play a supporting role. The metal ground planes are connected to the metal planes to form a common ground. Compared with the traditional dielectric waveguide, the dielectric waveguide transmission structure is easy to realize planar integration. The integrated design makes the dielectric waveguide transmission structure simple, stable and low-loss, and is suitable for integrated planar circuit board manufacturing processes such as millimeter wave terahertz, etc., as electromagnetic transmission in the frequency bands of millimeter wave terahertz and so on.

[0040] Example 3

[0041] like Figure 6 As shown, this embodiment provides a substrate-integrated notch mirror dielectric waveguide array, which is obtained by arranging the substrate-integrated notch mirror dielectric waveguide transmission structure array of embodiment 1 or embodiment 2.

[0042] The present invention provides a metallized through hole or an outer metal plane. The metallized through hole plus the metal planes on both sides, or the outer metal plane plus the metal planes on both sides can form a shield to prevent the exposed medium from absorbing electromagnetic waves. When multiple dielectric waveguides are designed into an array, they can be more dense and the coupling between the dielectric waveguides is very small.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A substrate integrated notch mirror dielectric waveguide transmission structure, characterized in that: The invention comprises a dielectric substrate (2), a metal ground plane (1) and a metal plane (3) attached to the lower surface of the dielectric substrate (2); air holes or air slots are provided along one side of the dielectric substrate (2); the air holes or air slots divide the dielectric substrate (2) into three parts, namely dielectric blocks on both sides and a dielectric strip (6) in the middle; the metal plane (3) is located on the upper surface of the dielectric block; and the metal plane (3) is connected to the metal ground plane (1) to form a common ground.

2. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 1, characterized in that: Air holes are provided along one side of the dielectric substrate (2); the air holes are through holes penetrating the upper and lower surfaces of the dielectric substrate (2); and the through holes are distributed in an array along one side of the dielectric substrate (2) to form a through hole array (4).

3. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 2, characterized in that: The metal plane (3) and the metal ground plane (1) are connected to form a common ground via a plurality of metallized through holes (5), and the plurality of metallized through holes (5) are located on a side of the dielectric block opposite to the through hole array (4).

4. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 3, characterized in that: A plurality of metallized through holes (5) form a metal column array, and the metal column array is located outside the through hole array (4) and parallel to the through hole array (4).

5. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 1, characterized in that: The dielectric strip (6) is located at the center of the dielectric substrate (2) and is used to transmit electromagnetic wave signals.

6. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 1, characterized in that: The metal planes (3) on both sides are separated by dielectric strips (6) and through-hole arrays (4), and form a common ground with the metallized through-holes (5) and the metal ground plane (1).

7. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 2, characterized in that: The through hole array (4) is a row of through holes, and the through holes are circular holes or rectangular holes.

8. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 1, characterized in that: An air slot is provided along one side of the dielectric substrate (2); the metal plane (3) and the metal ground plane (1) are connected via an outer metal plane (11) to form a common ground; the outer metal plane (11) is located on a side of the dielectric block opposite to the air slot.

9. The substrate integrated notch mirror dielectric waveguide transmission structure according to claim 8, characterized in that: The metal planes (3) on both sides are separated by dielectric strips (6) and air slots, and form a common ground with the outer metal plane (11) and the metal ground plane (1).

10. A substrate integrated notch mirror dielectric waveguide array, characterized in that: The substrate integrated notch mirror dielectric waveguide transmission structure array as described in any one of claims 1 to 9 is arranged.

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