Embedded non-reflective microwave antenna

Abstract

The present invention discloses an embedded non-reflection microwave antenna, comprising a top metal structure, a dielectric substrate and a bottom metal structure stacked in sequence from top to bottom, and also comprising a metallized via and a metal probe, wherein the metallized via penetrates the dielectric substrate; the metal probe penetrates the bottom metal structure and the dielectric substrate in sequence. The embedded non-reflection microwave antenna does not increase the antenna size extra, and has the advantages of dual-beam radiation, simple structure, low loss, and wide out-of-band non-reflection bandwidth.

Description

Technical Field

[0001] The present invention generally relates to the field of communications, specifically to the field of microwave communications, and in particular to an embedded non-reflective microwave antenna. Background Art

[0002] Active devices and antennas are necessary components of wireless communication systems. Traditional antennas are usually mismatched to out-of-band signals, which forces out-of-band signals to reflect at the antenna port, causing active devices to work unstably. At this time, the traditional method is to add microwave devices such as isolators, circulators or attenuators to reduce the impact of reflected signals, but this will increase the volume, number of components and cost of the overall system. A non-reflective antenna is an antenna that can be non-reflective both inside and outside the working frequency band. Within the working frequency band, the antenna impedance is matched to form a non-reflection state, and signals outside the working frequency band are absorbed to form a non-reflection state. At present, the non-reflective antenna is placed behind the active device, and there is no need to add microwave devices such as isolators, circulators or attenuators. It can not only absorb the out-of-band reflected signals at the antenna port, but also reduce the volume, number of components and cost of the overall system compared to the traditional method.

[0003] The existing non-reflection antennas are mainly divided into side-fire non-reflection antennas and end-fire non-reflection antennas according to the radiation type. They have problems such as complex antenna structure, large size, large loss, and narrow out-of-band non-reflection bandwidth. Currently, there are no relevant reports or research on dual-beam radiation, embedded non-reflection antennas. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide an embedded non-reflective microwave antenna.

[0005] An embodiment of the present invention provides an embedded non-reflective microwave antenna, comprising a top metal structure, a dielectric substrate and a bottom metal structure stacked in sequence from top to bottom, and also comprising a metallized via and a metal probe;

[0006] The top metal structure includes a rectangular metal patch, a square metal patch, a first metal strip, a second metal strip, a third metal strip and a grounding resistor coplanarly arranged on the dielectric substrate;

[0007] The rectangular metal patch is provided with a dumbbell-shaped groove, the dumbbell-shaped groove includes a first groove area, a second groove area and a third groove area which are sequentially connected in a first direction, the width of the first groove area in the second direction and the width of the third groove area in the second direction are both greater than the width of the second groove area in the second direction, the square metal patch is arranged in the second groove area, the first direction is the length direction of the rectangular metal patch, and the second direction is perpendicular to the first direction;

[0008] In the dumbbell-shaped slot, in a direction from the second slot area to the first slot area or the third slot area, the square metal patch, the first metal strip, the third metal strip, the grounding resistor and the second rectangular metal strip are sequentially connected in the first direction, the first metal strip extends along the first direction, the second metal strip extends along the second direction, and the second metal strip is connected to the first metal strip;

[0009] The third metal strip is provided with a bow-shaped groove bent in the second direction, and both ends and the center of the bow-shaped groove are located on a side of the third metal strip close to the second groove area;

[0010] The metallized via penetrates the dielectric substrate to connect the ground resistor and the second metal strip to the bottom metal structure respectively;

[0011] The metal probe sequentially penetrates the bottom metal structure and the dielectric substrate to be connected to the square metal patch.

[0012] In some examples, the bow-shaped groove includes a first segment, a second segment, a third segment, a fourth segment, a fifth segment, a sixth segment and a seventh segment connected in sequence, the first segment, the third segment, the fifth segment and the seventh segment are equal in length and extend along the first direction, the second segment, the fourth segment and the sixth segment are equal in length and extend along the second direction, and the second segment and the sixth segment are farther away from the second groove area than the fourth segment.

[0013] In some examples, the dumbbell-shaped groove is axially symmetrical about the center of the rectangular metal patch in the first direction.

[0014] In some examples, the first, second, and third trough regions are all rectangular.

[0015] In some examples, the dumbbell-shaped groove has a length direction perpendicular to the second direction and a width direction perpendicular to the first direction;

[0016] The length of the dumbbell-shaped groove is 0.85λ g -0.92λ g , the maximum width of the dumbbell-shaped groove is 0.20λ g -0.21λ g ,λ g is the microstrip wavelength corresponding to the center frequency;

[0017] The length of the second groove region is 0.12λ g -0.14λ g , the width of the second groove region is 0.14λ g -0.15λg ,λ g is the microstrip wavelength corresponding to the center frequency.

[0018] In some examples, the underlying metal structure includes a metal ground having a circular through hole formed therein, and the metal probe is insulated and passes through the circular through hole to be connected to the square metal patch.

[0019] In some examples, the dumbbell-shaped groove, the square metal patch, the metal ground, the circular through hole, and the metal probe are all coaxially arranged.

[0020] In some examples, the orthographic projection of the underlying metal structure on the dielectric substrate coincides with the dielectric substrate, and the orthographic projection of the rectangular metal patch on the dielectric substrate falls inside the dielectric substrate.

[0021] In some examples, the dielectric substrate is made of RO4003C.

[0022] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0023] The embedded non-reflective microwave antenna provided by the embodiment of the present invention comprises a metal probe and a square metal patch forming a feeding structure; a rectangular metal patch, a dumbbell-shaped slot, a dielectric substrate and a metal ground forming a patch radiator with an embedded dumbbell slot; a metal strip with an embedded bow-shaped slot, a dielectric substrate and a metal ground forming a band-stop filter; a first metal strip, a second metal strip, a metallized via, a dielectric substrate and a metal ground forming a T-shaped microstrip transmission structure; the band-stop filter with an embedded bow-shaped slot, the T-shaped microstrip transmission structure and a grounding resistor are connected in series to form an absorption structure, and the absorption structure is embedded inside the antenna without increasing the size of the antenna. The antenna has the advantages of dual-beam radiation, simple structure, low loss, and a wide out-of-band reflection-free bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1 A schematic side view of an embedded non-reflective microwave antenna provided by an embodiment of the present invention;

[0026] Figure 2 A schematic top view of an embedded non-reflective microwave antenna provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram showing comparison of matching simulation results between an embedded non-reflective microwave antenna provided in an embodiment of the present invention and a conventional dual-beam antenna;

[0028] Figure 4 A radiation efficiency diagram of an embedded non-reflective microwave antenna provided by an embodiment of the present invention;

[0029] Figure 5 A gain diagram of an embedded non-reflective microwave antenna provided by an embodiment of the present invention;

[0030] Figure 6 The simulated E-plane radiation pattern of the embedded non-reflection microwave antenna at the center frequency provided by the embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1-top metal structure, 101-rectangular metal patch, 102-dumbbell-shaped groove, 103-square metal patch, 104-first metal strip, 105-second metal strip, 106-bow-shaped groove, 107-third metal strip, 108-grounding resistor,

[0033] 2- Dielectric substrate,

[0034] 3-base metal structure, 301-metal ground,

[0035] 4-Metalized vias,

[0036] 5-Metal probe,

[0037] x-first direction, y-second direction, z-third direction. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] The embedded non-reflection microwave antenna according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an embedded non-reflective microwave antenna, comprising a top metal structure 1, a dielectric substrate 2 and a bottom metal structure 3 stacked in sequence from top to bottom, and also comprising a metallized via 4 and a metal probe 5;

[0042] The top metal structure 1 includes a rectangular metal patch 101, a square metal patch 103, a first metal strip 104, a second metal strip 105, a third metal strip 107 and a grounding resistor 108 coplanarly arranged on a dielectric substrate 2; the rectangular metal patch 101 is provided with a dumbbell-shaped groove 102, the dumbbell-shaped groove 102 includes a first groove area, a second groove area and a third groove area sequentially connected in a first direction, the width of the first groove area in the second direction and the width of the third groove area in the second direction are both greater than the width of the second groove area in the second direction, the square metal patch 102 is arranged in the second groove area, the second direction is perpendicular to the first direction, and the first direction is the length direction of the rectangular metal patch 101;

[0043] In the dumbbell-shaped slot 102, in the direction from the second slot area to the first slot area or the third slot area, the square metal patch 103, the first metal strip 104, the third metal strip 107 and the grounding resistor 108 are sequentially connected in the first direction, the first metal strip 104 extends along the first direction, the second metal strip 105 extends along the second direction, and the second metal strip 105 is connected to the first metal strip 104;

[0044] The third metal strip 107 is provided with a bow-shaped groove 106 bent in the second direction, and both ends and the center of the bow-shaped groove 106 are located on a side of the third metal strip 107 close to the second groove area;

[0045] The metallized via 4 penetrates the dielectric substrate 2 to connect the ground resistor 108 and the second metal strip 105 to the bottom metal structure 3 respectively;

[0046] The metal probe 5 passes through the bottom metal structure 3 and the dielectric substrate 2 in sequence to be connected to the square metal patch 103 .

[0047] In order to facilitate the description of the embedded non-reflective microwave antenna, a first direction, a second direction and a third direction which are perpendicular to each other are introduced to better describe the structure of the antenna. Figure 1 and Figure 2 , x represents the first direction, i.e., the length direction of the rectangular metal patch 101 , y represents the second direction, and z represents the third direction, i.e., the thickness direction of the antenna, specifically, the stacking direction of the top metal structure 1 , the dielectric substrate 2 , and the bottom metal structure 3 .

[0048] Figure 2 In the figure, the dumbbell-shaped groove 102 is a groove which is narrow in the middle and wide at both sides in the first direction x, and includes a first groove area, a second groove area and a third groove area from left to right. Figure 2 In the exemplary direction from the second slot area to the first slot area, the square metal patch 103 , the first metal strip 104 , the third metal strip 107 and the grounding resistor 108 are sequentially connected in the first direction x.

[0049] Among them, the metal probe 5 and the square metal patch 103 constitute a feeding structure; the rectangular metal patch 101, the dumbbell-shaped slot 102, the dielectric substrate 2 and the metal ground 3 constitute a patch radiator with an embedded dumbbell slot; the metal strip 107 with an embedded bow-shaped slot 106, the dielectric substrate 2 and the metal ground 3 constitute a band-stop filter; the first metal strip 104, the second metal strip 105, the metallized via 4, the dielectric substrate 2 and the metal ground 301 constitute a T-shaped microstrip transmission structure. The band-stop filter with an embedded bow-shaped slot 106, the T-shaped microstrip transmission structure and the grounding resistor are connected in series to form an absorption structure, and the absorption structure is embedded inside the antenna.

[0050] In this embodiment, the signal enters the antenna through the feeding structure, part of the signal is coupled to the patch radiator with the embedded dumbbell slot, and part of the signal enters the grounding resistor 108 through the T-shaped microstrip transmission structure and the band-stop filter. Under the action of the overall structure, an embedded non-reflection antenna is formed, which has the advantages of not increasing the antenna size, simple structure, low loss, and wide out-of-band reflection-free bandwidth.

[0051] The T-shaped microstrip transmission structure is mainly used to adjust the overall impedance after the antenna branch and the filter branch are combined. The T-shaped microstrip transmission structure is set in the embedded non-reflective microwave antenna. The frequency at which the imaginary part of the out-of-band impedance is zero moves toward the working frequency band, and the real part of the out-of-band impedance increases and approaches 50Ω, and the matching within the working frequency band will also be improved; at the same time, after adopting the T-shaped microstrip transmission structure, the overall circuit size used for matching is smaller and can be embedded inside the antenna, which has less impact on the work of the antenna.

[0052] In this embodiment, a dumbbell-shaped slot 102 is provided in a rectangular metal patch 101, and a feeding structure composed of a metal probe 5 and a square metal patch 103 is coupled with two metal edges opposite to each other in the second direction y of the second slot region of the dumbbell-shaped slot 102, thereby exciting the quasi-TM 20 Mode, at this time, the surface current of the rectangular metal patch 101 contains two maximum values ​​and in opposite directions, satisfying the dual-beam radiation. Although the feeding structure and the antenna structure are both symmetrical, two band-stop filters cannot be placed symmetrically, otherwise the out-of-band absorption zero point will be far away from the center frequency, and the out-of-band non-reflection effect will be poor.

[0053] Furthermore, the bow-shaped groove 106 includes a first section, a second section, a third section, a fourth section, a fifth section, a sixth section and a seventh section connected in sequence, the first section, the third section, the fifth section and the seventh section are equal in length and extend along the first direction, the second section, the fourth section and the sixth section are equal in length and extend along the second direction, and the second section and the sixth section are both farther away from the second groove area than the fourth section.

[0054] Figure 2In the figure, from top to bottom, there are the first section, the second section, the third section, the fourth section, the fifth section, the sixth section and the seventh section. The first section, the third section, the fifth section and the seventh section are all along the first direction (corresponding to Figure 2 The second section, the fourth section and the sixth section all extend in the second direction (corresponding to the horizontal direction of Figure 2 The second section and the sixth section are distributed close to the left side of the first groove area, and the fourth section is distributed close to the right side of the first groove area.

[0055] The center point of the bow-shaped slot 106 is the center of the fourth segment, and the two short-circuit ends of the bow-shaped slot 106 are respectively one end of the first segment away from the second segment and one end of the seventh segment away from the sixth segment. The two short-circuit ends of the bow-shaped slot 106 in the band-stop filter are on the same side as the center point, and the current at the edge of the bow-shaped slot 106 is strongest at the short-circuit end and weakest at the center. Such a structure and current arrangement can enable the band-stop response to obtain a higher Q value (quality factor) and reduce the length of the band-stop filter, wherein a high Q value is beneficial for the band-stop filter to obtain better frequency selectivity, and to enhance the ability to bind current so as to reduce the interference with the antenna alignment. 20 The coupling between the modes can be reduced, thereby improving the out-of-band absorption effect of the overall antenna, and the shorter band-stop filter is conducive to the realization of an embedded non-reflective antenna to avoid being too long to be placed in the antenna.

[0056] Furthermore, the dumbbell-shaped slot 102 is axially symmetrical about the center of the rectangular metal patch 101 in the first direction, so that the embedded non-reflective microwave antenna satisfies dual-beam radiation.

[0057] Furthermore, the first groove area, the second groove area and the third groove area are all rectangular, which can reduce the difficulty of forming the dumbbell-shaped groove 102 and simplify the difficulty of processing the rectangular metal patch 101.

[0058] Further, the length direction of the dumbbell-shaped groove 102 is perpendicular to the second direction, and the width direction is perpendicular to the first direction;

[0059] The length of the dumbbell-shaped groove 102 is 0.85λ g -0.92λ g , the maximum width of the dumbbell-shaped groove 102 is 0.20λ g -0.21λ g ,λ g is the microstrip wavelength corresponding to the center frequency;

[0060] The length of the second groove region is 0.12λ g -0.14λ g , the width of the second groove is 0.14λ g -0.15λ g ,λ g is the microstrip wavelength corresponding to the center frequency.

[0061] If the slot length is too short, the absorption structure cannot be embedded in the antenna and more cross-polarization current will appear. If the slot length is too long, quasi-TM 20 Mode polarization current loss; too wide a slot width will cause quasi-TM 20 The problem of mode polarization current loss, radiation pattern deformation, gain reduction, etc., while the slot width is too narrow, the absorption structure cannot be embedded in the antenna, or the band-stop filter and the patch antenna are too strongly coupled, weakening the out-of-band reflection-free effect. The dumbbell-shaped slot 102 is symmetrically embedded in the rectangular metal patch 101 as a whole. In order to take into account the embeddability of the overall antenna, the maintenance of the polarization current, the maintenance of the radiation pattern and gain, the length of the dumbbell-shaped slot 102 is maintained at 0.85λ g -0.92λ g The width is kept at 0.20λ g -0.21λ g between.

[0062] The length of the second groove region is 0.12λ g -0.14λ g , the width of the second groove is 0.14λ g -0.15λ g , that is, the length of the second groove region in the first direction is 0.12λ g -0.14λ g , the length of the second groove region in the second direction is 0.14λ g -0.15λ g , ensuring that the square metal patch 103 is arranged in the second slot area, and the metal probe 5 and the square metal patch 104 form a feeding structure, so that the feeding structure is coupled with the two metal edges of the second slot area opposite to each other in the second direction, and the quasi-TM of the embedded dumbbell slot patch antenna is excited. 20 mode to achieve dual-beam radiation.

[0063] Furthermore, the bottom metal structure 3 includes a metal ground 301, and a circular through hole is provided on the metal ground 301. The metal probe 5 is insulated and passes through the circular through hole to be connected to the square metal patch 103. In this way, it is ensured that there is no electrical connection between the metal probe 5 and the metal ground 301, and the signal is fed from the metal probe 5 to the square metal patch 103.

[0064] Furthermore, the dumbbell-shaped slot 102 , the square metal patch 103 , the metal ground 301 , the circular through hole and the metal probe 5 are all coaxially arranged. Thus, the metal probe 5 is cylindrical in the third direction z, ensuring that the signal is fed from the metal probe 5 into the square metal patch 103 .

[0065] Furthermore, the orthographic projection of the bottom metal structure 3 on the dielectric substrate 2 coincides with the dielectric substrate 2, and the orthographic projection of the rectangular metal patch 101 on the dielectric substrate 2 falls inside the dielectric substrate 2. With this arrangement, the dielectric substrate 2 plays a good role in bearing and supporting; the main body of the bottom metal structure 3 is the metal ground 301.

[0066] Furthermore, the material of the dielectric substrate is RO4003C, which has a relative dielectric constant of 3.55, low loss, stable electrical characteristics at different frequencies, and low cost, thereby ensuring the performance of the antenna and reducing the production cost of the antenna.

[0067] Combine the following Figure 3-Figure 6 , to illustrate the simulation of the above-mentioned embedded non-reflective microwave antenna.

[0068] Figure 3 A schematic diagram comparing the matching simulation results of the embedded non-reflection microwave antenna provided in an embodiment of the present invention and the traditional dual-beam antenna, in the entire observation band, three frequency bands are covered below -10dB, of which 5.71GHz-5.87GHz is the working frequency band, 3.50GHz-5.26GHz and 6.18GHz-6.77GHz are the out-of-band reflection-free frequency bands, achieving an out-of-band reflection-free relative bandwidth of up to 40.5%, while the traditional dual-beam antenna only covers 5.75GHz-5.85GHz below -10dB, which is the working frequency band of the traditional dual-beam antenna, and there is no out-of-band reflection-free performance. Figure 4 , Figure 5 They are respectively a radiation efficiency diagram and a gain diagram of the embedded non-reflection microwave antenna provided in an embodiment of the present invention, wherein the maximum radiation efficiency is 84.3% and the maximum gain is 5.78 dBi. Figure 6 The simulated E-plane radiation pattern of the embedded non-reflective microwave antenna at the center frequency provided by the embodiment of the present invention, Figure 6 The two beams point to +45° and -44°, the 3dB beam width is 57.7°, and the cross-polarization level is less than -20dB. The relative dielectric constant of 3.55 and the thickness of 0.055λ are used in the above simulation process. g RO4003C substrate, size 0.914λ g ×0.582λ g Rectangular metal patch.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] The present invention uses first, second, etc. to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present invention (but not limited to) to form a technical solution.

Claims

1. An embedded non-reflective microwave antenna, characterized in that: It includes a top metal structure (1), a dielectric substrate (2) and a bottom metal structure (3) stacked in sequence from top to bottom, and also includes a metallized via (4) and a metal probe (5); The top metal structure (1) comprises a rectangular metal patch (101), a square metal patch (103), a first metal strip (104), a second metal strip (105), a third metal strip (107) and a grounding resistor (108) which are coplanarly arranged on the dielectric substrate (2); The rectangular metal patch (101) is provided with a dumbbell-shaped groove (102), the dumbbell-shaped groove (102) comprises a first groove area, a second groove area and a third groove area which are sequentially connected in a first direction, the width of the first groove area in the second direction and the width of the third groove area in the second direction are both greater than the width of the second groove area in the second direction, the square metal patch (103) is arranged in the second groove area, the first direction is the length direction of the rectangular metal patch (101), and the second direction is perpendicular to the first direction; In the dumbbell-shaped slot (102), in the direction from the second slot area to the first slot area or the third slot area, the square metal patch (103), the first metal strip (104), the third metal strip (107) and the grounding resistor (108) are sequentially connected in the first direction, the first metal strip (104) extends along the first direction, the second metal strip (105) extends along the second direction, and the second metal strip (105) is connected to the first metal strip (104), and is coupled with two metal edges of the second slot area of ​​the dumbbell-shaped slot (102) opposite to each other in the second direction y, thereby exciting the quasi-TM of the embedded dumbbell slot patch antenna 20 mode, at this time, the surface current of the rectangular metal patch (101) contains two maximum values ​​and the directions are opposite, satisfying the dual-beam radiation; The third metal strip (107) is provided with a bow-shaped groove (106) bent in the second direction, and both ends and the center of the bow-shaped groove (106) are located on a side of the third metal strip (107) close to the second groove area; The metallized via (4) penetrates the dielectric substrate (2) to connect the grounding resistor (108) and the second metal strip (105) to the bottom metal structure (3) respectively; The metal probe (5) sequentially passes through the bottom metal structure (3) and the dielectric substrate (2) to be connected to the square metal patch (103); The dumbbell-shaped groove (102) has a length direction perpendicular to the second direction, and a width direction perpendicular to the first direction; The length of the dumbbell-shaped groove (102) is 0.85λ g -0.92λ g The maximum width of the dumbbell-shaped groove (102) is 0.20λ g -0.21λ g ,λ g is the microstrip wavelength corresponding to the center frequency; The length of the second groove region is 0.12λ g -0.14λ g , the width of the second groove region is 0.14λ g -0.15λ g ,λ g is the microstrip wavelength corresponding to the center frequency.

2. The embedded non-reflective microwave antenna according to claim 1, characterized in that: The bow-shaped groove (106) includes a first section, a second section, a third section, a fourth section, a fifth section, a sixth section and a seventh section connected in sequence, wherein the first section, the third section, the fifth section and the seventh section are of equal length and extend along the first direction, the second section, the fourth section and the sixth section are of equal length and extend along the second direction, and the second section and the sixth section are both farther away from the second groove area than the fourth section.

3. The embedded non-reflective microwave antenna according to claim 1, characterized in that: The dumbbell-shaped groove (102) is in an axisymmetric structure about the center of the rectangular metal patch (101) in the first direction.

4. The embedded non-reflective microwave antenna according to claim 3, characterized in that: The first groove area, the second groove area and the third groove area are all rectangular.

5. The embedded non-reflective microwave antenna according to claim 3, characterized in that: The bottom metal structure (3) comprises a metal ground (301), a circular through hole is provided on the metal ground (301), and the metal probe (5) is insulated and passes through the circular through hole to be connected to the square metal patch (103).

6. The embedded non-reflective microwave antenna according to claim 5, characterized in that: The dumbbell-shaped groove (102), the square metal patch (103), the metal ground (301), the circular through hole and the metal probe (5) are all coaxially arranged.

7. The embedded non-reflective microwave antenna according to claim 1, characterized in that: The orthographic projection of the bottom metal structure (3) on the dielectric substrate (2) coincides with the dielectric substrate (2), and the orthographic projection of the rectangular metal patch (101) on the dielectric substrate (2) falls inside the dielectric substrate (2).

8. The embedded non-reflective microwave antenna according to claim 1, characterized in that: The material of the dielectric substrate is RO4003C.

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