Electromagnetic bandgap structures, radio frequency antenna structures

Abstract

The electromagnetic bandgap structure and the radio frequency antenna structure are disclosed. The electromagnetic bandgap structure comprises at least one inductance pattern, at least one capacitance pattern and a connecting unit; the capacitance pattern is arranged in the inductance pattern; and the capacitance pattern is connected with the inductance pattern through the connecting unit. The electromagnetic bandgap structure provided by the embodiment of the present application can filter out the radio frequency coupling signals while realizing the miniaturization of the structure.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electromagnetic radiation technology, and in particular to electromagnetic bandgap structures and radio frequency antenna structures. Background Technology

[0002] With the continuous development and upgrading of communication networks, the radio frequency spectrum is becoming increasingly congested. Simultaneously, both everyday communication and key technological fields such as the Internet of Things (IoT) place high demands on the bandwidth and speed of data traffic. Therefore, the millimeter-wave band has received considerable attention in recent years. Within this high-frequency band, wavelengths are only a few millimeters, significantly reducing the design size of many radio frequency devices, such as antennas in the RF front-end. However, within this size, there is strong coupling between antennas and between antenna feed lines, severely impacting the quality of received signals.

[0003] The EBG (electromagnetic band gap) structure has been widely used in microwave device and antenna design in recent years. It can effectively reduce the coupling between antennas and between antenna feed lines, and improve isolation.

[0004] However, existing EBGs require the arrangement of multiple units, resulting in a relatively large EBG structure. With the increasing miniaturization of RF systems, the requirements for manufacturing precision are rising, and system space is shrinking. Under current manufacturing conditions and precision requirements, EBG structures often struggle to achieve effective isolation. Summary of the Invention

[0005] This invention provides an electromagnetic bandgap structure and a radio frequency antenna structure to achieve miniaturization of the structure while filtering out radio frequency coupled signals.

[0006] In a first aspect, embodiments of the present invention provide an electromagnetic bandgap structure, the electromagnetic bandgap structure comprising at least one inductor pattern, at least one capacitor pattern, and a connection unit;

[0007] The capacitor pattern is disposed within the area defined by the capacitor pattern;

[0008] The capacitor pattern is connected to the inductor pattern through the connection unit.

[0009] Optionally, the capacitor pattern includes two straight line segments; the two straight line segments are parallel to each other to form a capacitor structure.

[0010] Optionally, the shape of the inductor pattern includes a ring structure.

[0011] Optionally, the shape of the inductor pattern includes circular rings, elliptical rings, and polygonal rings.

[0012] Secondly, embodiments of the present invention also provide an electromagnetic bandgap structure, the electromagnetic bandgap structure having a bandgap isolation region and a peripheral metal region surrounding the bandgap isolation region, the electromagnetic bandgap structure comprising:

[0013] An outer metal sheet is disposed within the outer metal area;

[0014] A capacitor pattern, wherein the capacitor pattern includes at least one first capacitor pattern and at least one second capacitor pattern;

[0015] Inductor pattern;

[0016] The first capacitor pattern includes two straight line segments that are parallel to each other; the second capacitor pattern includes an interdigitated structure, which includes a first interdigitated unit and a second interdigitated unit; the first interdigitated unit is nested within the second interdigitated unit; the interdigitated structure is connected to the peripheral metal sheet through the first interdigitated unit; and the inductor pattern is connected to the second interdigitated unit.

[0017] Optionally, the first interdigitated unit includes a strip-shaped protrusion, and the second interdigitated unit includes a U-shaped recess;

[0018] One end of the strip-shaped protrusion is connected to the outer metal sheet, and the other end is inserted into the U-shaped recess.

[0019] Optionally, the second interdigitated unit further includes two parallel strip structures;

[0020] One end of the strip-shaped protrusion is connected to the outer metal sheet, and the other end is inserted into the area between the two parallel strip structures;

[0021] The second interdigitated unit structures between adjacent interdigitated structures are different.

[0022] Thirdly, embodiments of the present invention also provide an electromagnetic bandgap structure, the electromagnetic bandgap structure including an inductor pattern, a capacitor pattern, a first connection unit, and a second connection unit;

[0023] The capacitor pattern is disposed within the inductor pattern;

[0024] The capacitor pattern includes a first straight line segment and a second straight line segment; the first straight line segment and the second straight line segment are parallel to each other to form a capacitor structure;

[0025] The shape of the inductor pattern includes a ring structure;

[0026] The first straight line segment is connected to the inductor pattern through the first connecting unit; the second straight line segment is connected to the inductor pattern through the second connecting unit.

[0027] Optionally, the inductor pattern may include a ring structure, and the shape of the inductor pattern may be a circular ring, an elliptical ring, or a ring with opposite sides, etc.

[0028] Fourthly, embodiments of the present invention also provide a radio frequency antenna structure, the radio frequency antenna structure comprising:

[0029] At least two antennas; and,

[0030] The electromagnetic bandgap structure as described in the first and second aspects; wherein at least one of the electromagnetic bandgap structures is disposed between two adjacent antennas.

[0031] Optionally, the electromagnetic bandgap structure and the at least two antennas are disposed in the same metal layer.

[0032] Optionally, the radio frequency antenna structure further includes a bottom metal layer, a dielectric layer, and a top metal layer stacked sequentially;

[0033] The electromagnetic bandgap structure and the at least two antennas are disposed in the top metal layer.

[0034] Optionally, the bottom metal layer includes a reference ground cell;

[0035] Wherein, the vertical projection of the electromagnetic bandgap structure onto the plane where the reference ground cell is located at least partially overlaps with the reference ground cell.

[0036] This invention incorporates a capacitor pattern within an inductor pattern. The capacitor pattern is connected to the inductor pattern via connecting units. Because the capacitor pattern is positioned within the inductor pattern, compared to the parallel arrangement of capacitor and inductor patterns in existing technologies, the size of the electromagnetic bandgap structure is reduced, achieving miniaturization of the device structure. Furthermore, since the sizes of the inductor and capacitor patterns are adjustable, the resonant frequency of the electromagnetic bandgap structure can be flexibly adjusted by changing its dimensions, making it suitable for isolating radio frequency signals of different frequencies. Simultaneously, because the capacitor pattern within the electromagnetic bandgap structure provides filtering capacitance, it eliminates the need for multiple units to provide coupling capacitance as in traditional electromagnetic bandgap structures, allowing for a more compact device layout. Additionally, no backplane is required to provide capacitance; therefore, when the electromagnetic bandgap structure in this embodiment is applied to a radio frequency antenna structure, electromagnetic isolation between antennas can be achieved without a metal ground plane on the back of the antenna structure. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of an electromagnetic bandgap structure provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention;

[0044] Figure 8 This is a dispersion curve diagram obtained after simulation based on the electromagnetic bandgap structure provided in the embodiment of the present invention;

[0045] Figure 9 This is a schematic diagram of a planar structure of an electromagnetic bandgap structure applied to a radio frequency antenna, provided by an embodiment of the present invention.

[0046] Figure 10 This is a cross-sectional view of a radio frequency antenna structure provided in an embodiment of the present invention;

[0047] Figure 11 This is a comparison diagram of the isolation degree between the absence of an electromagnetic bandgap structure and the presence of an electromagnetic bandgap structure, provided in an embodiment of the present invention.

[0048] Figure 12 This is a schematic diagram of a planar structure for applying an electromagnetic bandgap structure to a radio frequency antenna, as provided in an embodiment of the present invention. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] Figure 1 This is a schematic diagram of an electromagnetic bandgap structure provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the electromagnetic bandgap structure includes at least one inductor pattern 10, at least one capacitor pattern 20, and a connecting unit 30; the capacitor pattern 20 is disposed within the area defined by the inductor pattern 10; the capacitor pattern 20 is connected to the inductor pattern 10 through the connecting unit 30.

[0051] The capacitor pattern 20 is used to provide a capacitor with an electromagnetic bandgap structure, and the inductor pattern 10 is used to provide an inductor connected in series with the capacitor; the electromagnetic bandgap structure is used to isolate electromagnetic signals of a preset frequency based on the capacitor and the inductor.

[0052] In this embodiment of the invention, the capacitor pattern 20 is disposed within the area defined by the inductor pattern 10. Compared to the prior art where capacitor and inductor patterns are arranged side by side, this reduces the size of the electromagnetic bandgap structure, achieving miniaturization of the device structure. Furthermore, since the sizes of the inductor pattern 10 and capacitor pattern 20 are adjustable, the resonant frequency of the electromagnetic bandgap structure can be flexibly adjusted by changing its size, making it suitable for isolating radio frequency signals of different frequencies. Simultaneously, because the capacitor pattern in the electromagnetic bandgap structure can provide filtering capacitance, it eliminates the need for multiple units to provide coupling capacitance as in traditional electromagnetic bandgap structures, allowing for a more compact device arrangement. Also, it eliminates the need for a backplane to provide capacitance. Therefore, when the electromagnetic bandgap structure in this embodiment is applied to a radio frequency antenna structure, electromagnetic isolation between antennas can be achieved without a metal ground plane on the back of the antenna structure, simplifying manufacturing and reducing cost.

[0053] Optional, see below Figure 1 The capacitor pattern 20 includes two straight line segments 21; the two straight line segments 21 are parallel to each other to form a capacitor structure.

[0054] It should be noted that, in this embodiment, the capacitor pattern 20 being disposed within the area defined by the inductor pattern 10 can be understood as the inductor pattern 10 being disposed in an area within the region defined by the capacitor pattern 20 where no other devices are disposed. That is, the placement of the inductor pattern 10 within the region defined by the capacitor pattern 20 will not adversely affect the electrical performance of the capacitor formed by the capacitor pattern 20, or the adverse effect is negligible. Furthermore, the "straight line segment 21" constituting the capacitor is not a line segment in the mathematical sense, but rather refers to a "line"-shaped metal strip. This "straight line segment 21" has a certain width (e.g., process critical dimension CD), but this width is very small compared to the length of the "straight line segment 21." Therefore, for the sake of clarity and simplicity, it is called "straight line segment 21." Similarly, the "line" described in other parts of this application can be understood in the same way.

[0055] For example, the two straight line segments 21 can provide capacitance for two parallel metal plates, i.e., two built-in parallel metal plates. The spacing D and length L of the two parallel metal plates can adjust the resonant frequency of the structure, thereby filtering out electromagnetic waves at that resonant frequency and improving isolation. Specifically, the resonant frequency of the structure can be adjusted by controlling the length L of the parallel metal plates; a longer length L results in a lower resonant frequency, and vice versa. The resonant frequency of the structure can also be adjusted by controlling the spacing D of the parallel metal plates; increasing the spacing D increases the resonant frequency, and decreasing the spacing D decreases the resonant frequency. For example, in this embodiment, the inductor pattern 10 of the electromagnetic bandgap structure is a rectangular ring with an edge dimension of 0.75 × 0.26 mm. 2 Compared to a wavelength of 77 GHz, this structure has a size of only 0.19λ × 0.07λ, meaning that the size of this electromagnetic bandgap structure is very small, enabling the miniaturization of the device structure.

[0056] Optional, see below Figure 1 The shape of the inductor pattern 10 may include a ring structure, that is, the interior of the inductor pattern 10 has a blank area (i.e., an area where no device is provided) so that devices such as capacitors can be provided in the blank area, thereby reducing the area occupied by the electromagnetic bandgap structure as a whole.

[0057] It should be noted that, Figure 1 The inductor pattern 10 is illustrated using a rectangular ring as an example. This elongated rectangular ring structure is suitable for applications with compact structures, such as antenna arrays. In other embodiments, the shape of the inductor pattern 10 can also be flexibly adopted, such as a circular ring, elliptical ring, or polygonal ring, to adapt to the shape and components of each antenna in the antenna array, maximizing the utilization of the "gaps" formed by the antenna array distribution and improving the compactness of the device. For example, Figure 2 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the inductor pattern 10 is circular in shape. Figure 3 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the inductor pattern 10 is elliptical in shape. In this technical solution, the inductor pattern 10 can be in geometric shapes such as circular ring, elliptical ring, and polygonal ring to adapt to the shape of other devices, thereby greatly improving the space utilization of the device, making the device arrangement more compact, and realizing the miniaturization of the device structure.

[0058] Figure 4 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention. See also... Figure 4The electromagnetic bandgap structure has a bandgap isolation region ZZ and a peripheral metal region YY surrounding the bandgap isolation region ZZ. The electromagnetic bandgap structure includes: a peripheral metal sheet 40 disposed in the peripheral metal region YY; a capacitor pattern 20; the capacitor pattern 20 includes at least one first capacitor pattern 22 and at least one second capacitor pattern 23; an inductor pattern 10; the first capacitor pattern 22 includes two straight line segments 21; the two straight line segments 21 are parallel to each other; the second capacitor pattern 23 includes an interdigitated structure, the interdigitated structure includes a first interdigitated unit 24 and a second interdigitated unit 25; the first interdigitated unit 24 is nested in the second interdigitated unit 25; the interdigitated structure is connected to the peripheral metal sheet 40 through the first interdigitated unit 24; and the inductor pattern 10 is connected to the second interdigitated unit 25.

[0059] The interdigitated structure and two parallel straight line segments 21 are used to provide the capacitor for the electromagnetic bandgap structure, and the inductor pattern 10 is used to provide the inductor connected in series with the capacitor. The electromagnetic bandgap structure is used to isolate electromagnetic signals of a preset frequency based on the capacitor and inductor.

[0060] The shape of the bandgap isolation region ZZ can be square, circular, or elliptical, and this embodiment provides a specific definition. When the shape of the bandgap isolation region ZZ is square, the shape of the inductor structure 10 is folded; when the shape of the bandgap isolation region ZZ is circular or elliptical, the shape of the inductor pattern 10 is arc-shaped.

[0061] The number of interdigitated structures can be one or more, for example, two. When there are multiple interdigitated structures, the two ends of the inductor pattern 10 are respectively connected to two adjacent second interdigitated units 25. Figure 4 The following is an example illustration using only two interdigitated structures.

[0062] Specifically, the resonant frequency of the electromagnetic bandgap structure 100 can be controlled by adjusting the length of the interdigitated structure (e.g., the lengths of the first interdigitated unit 24 and the second interdigitated unit 25) and the lengths and spacing of the two parallel straight line segments 21, thereby filtering out radio frequency coupled signals of a specified frequency. This technical solution offers several advantages. First, the length of the interdigitated structure and the lengths and spacing of the two parallel straight line segments 21 are controllable, allowing for flexible adjustment of the resonant frequency of the electromagnetic bandgap structure to achieve the effect of filtering out radio frequency coupled signals of a specified frequency and reducing interference between channels. Second, the interdigitated structure and the two parallel straight line segments 21 provide capacitance. Therefore, compared to electromagnetic bandgap structures in the prior art, the interdigitated structure and the two parallel straight line segments 21 in this embodiment do not require a backplane to provide capacitance, nor do they require periodically arranging multiple units to provide coupling capacitance. Furthermore, the interdigitated structure and the two parallel straight line segments 21 do not have special requirements for the metal reference plane located below them. This electromagnetic bandgap structure can achieve the performance of a single unit operating, making it suitable for systems with limited space.

[0063] It should be noted that the second interdigitated unit 25 may or may not be connected. Figure 4 The following example is illustrated by connecting the second interdigitated unit 25. Figure 5 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the second interdigitated unit 25 is not connected.

[0064] Optional, see below Figure 4 The first interdigitated unit 24 includes a strip-shaped protrusion, and the second interdigitated unit 25 includes a U-shaped recess; wherein one end of the strip-shaped protrusion is connected to the outer metal sheet 40, and the other end is inserted into the U-shaped recess.

[0065] Optional, Figure 6 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention. See also... Figure 6 The second interdigitated unit 25 also includes two parallel strip structures; one end of the strip protrusion is connected to the outer metal sheet 40, and the other end is inserted into the area between the two parallel strip structures; wherein, the structures of the second interdigitated units 25 between adjacent interdigitated structures are different.

[0066] Figure 7 This is a schematic diagram of another electromagnetic bandgap structure provided in an embodiment of the present invention. See also... Figure 7 The electromagnetic bandgap structure includes an inductor pattern 10, a capacitor pattern 20, a first connecting unit 31, and a second connecting unit 32. The capacitor pattern 20 is disposed within the inductor pattern 10. The capacitor pattern 20 includes a first straight line segment 211 and a second straight line segment 212. The two straight line segments are parallel to each other to form a capacitor structure. The inductor pattern 10 has a ring-shaped structure. The first straight line segment 211 is connected to the inductor pattern 10 through the first connecting unit 31. The second straight line segment 212 is connected to the inductor pattern 10 through the second connecting unit 32.

[0067] The first and second parallel straight line segments 211 and 212 provide the capacitance of the electromagnetic bandgap structure, and the inductor structure 10 provides the inductance connected in series with the capacitor via the first connecting unit 31 and the second connecting unit 32. The electromagnetic bandgap structure is used to isolate electromagnetic signals of a preset frequency based on the capacitance and inductance.

[0068] For example, the two straight line segments 21 can provide capacitance for two parallel metal plates, i.e., two built-in parallel metal plates. The spacing D and length L of the two parallel metal plates can adjust the resonant frequency of the structure, thereby filtering out electromagnetic waves at that resonant frequency and improving isolation. Specifically, the resonant frequency of the structure can be adjusted by controlling the length L of the parallel metal plates; a longer length L results in a lower resonant frequency, and vice versa. Similarly, the resonant frequency of the structure can be adjusted by controlling the spacing D of the parallel metal plates; increasing the spacing D increases the resonant frequency, while decreasing it decreases it.

[0069] Optionally, the inductor pattern 10 may include a ring structure, and the shape of the inductor pattern 10 may include a circular ring, an elliptical ring, or a polygonal ring.

[0070] It should be noted that those skilled in the art will understand that the shape of the inductor pattern 10 is not limited to the above example. Those skilled in the art can make adjustments according to the actual situation, as long as an inductor connected in series with the capacitor can be provided so that the electromagnetic bandgap structure can be used to isolate electromagnetic signals of a preset frequency according to the capacitor and the inductor. Further details will not be elaborated here.

[0071] In this technical solution, the shape of the inductor pattern 10 can be a circular ring, an elliptical ring, or a polygonal ring, etc., to adapt to the shape of other devices, thereby greatly improving the space utilization of the devices, making the device arrangement more compact, and realizing the miniaturization of the device structure.

[0072] Figure 8 This is a dispersion curve obtained after simulation based on the electromagnetic bandgap structure provided in this embodiment of the invention. Based on this dispersion spectrum, it can be concluded that the electromagnetic bandgap structure has the best isolation effect in the range of 70G-110G (shaded area in the figure).

[0073] Figure 9 This is a schematic diagram of a planar structure of a radio frequency antenna provided in an embodiment of the present invention. Figure 10 This is a cross-sectional view of a radio frequency antenna structure provided in Embodiment 3 of the present invention. See also... Figure 9 and Figure 10 The radio frequency antenna structure includes: at least two antennas 110; and an electromagnetic bandgap structure 100 as described in any of the above embodiments; wherein at least one electromagnetic bandgap structure 100 is disposed between two adjacent antennas 110. The radio frequency antenna structure also includes a bottom metal layer 400, a dielectric layer 300, and a top metal layer 200 stacked sequentially; wherein the electromagnetic bandgap structure 100 and the at least two antennas 110 are disposed in the top metal layer 200, that is, the transmission lines of the electromagnetic bandgap structure 100 and the antennas 110 can be device structures formed in the same metal layer using the same or the same etching process.

[0074] Figure 9 An exemplary schematic diagram of a 4×1 antenna array employing the electromagnetic bandgap structure 100 is shown. This antenna is a coplanar waveguide-fed microstrip slot antenna, primarily radiating through rectangular patches 112 and square slots 111. The antennas 110 are spaced approximately 1.5 mm apart, and all metal structures are printed on a dielectric layer 300 with a dielectric constant of 3.6 and a thickness of 0.145 mm. To verify the proposed electromagnetic bandgap structure 100, three columns of 4×1 electromagnetic bandgap structures 100 are printed between adjacent antennas 110 to reduce coupling between antennas and improve isolation.

[0075] Specifically, Figure 11 This is a comparison diagram of the isolation degree between having and not having an electromagnetic bandgap structure, provided in an embodiment of the present invention. Figure 11 It can be concluded that when the electromagnetic bandgap structure of this embodiment is used, the isolation of the antenna is greatly improved in the range of 77-93GHz.

[0076] In summary, the electromagnetic gap structure 100 in the above embodiments can be used to isolate the transmission lines of adjacent antennas 110. That is, at least one electromagnetic gap structure 100 can be provided between two adjacent antennas 110 for electromagnetic isolation. When the electromagnetic gap structure 100 is a rectangular ring structure, its length must be perpendicular to the extension direction of the transmission lines of each antenna 110. In other words, the width of the rectangular ring electromagnetic gap structure 100 is parallel to the extension direction of the transmission lines of each antenna 110, thereby isolating interference between the transmission lines of two adjacent antennas 110. Furthermore, to improve the isolation between the transmission lines of two adjacent antennas 110, multiple electromagnetic gap structures 100 can be sequentially provided along the extension direction of the transmission lines of each antenna 110. That is, multiple electromagnetic bandgap structures 100 can be sequentially provided along the extension direction of the antennas 110, forming a strip-shaped isolation band between adjacent antennas to further improve the electromagnetic isolation between adjacent antennas.

[0077] It should be noted that the radio frequency antenna structure of the embodiments of this application has various forms, that is, the radio frequency antenna structure can also be other antenna structures, as long as the above-mentioned electromagnetic bandgap structure is provided between adjacent antennas 110, such as between transmission lines and / or between radiating structures, to improve the electromagnetic isolation between adjacent antennas.

[0078] It should also be noted that the arrangement of the electromagnetic gap structure 100 in the embodiments of this application has various forms. Figure 9 This example only illustrates four electromagnetic gap structures 100 positioned between two adjacent antennas 110, with the length of each of the four electromagnetic gap structures 100 perpendicular to the extension direction of the transmission lines of each antenna 110. In an optional embodiment, see... Figure 12Five electromagnetic gap structures 100 are arranged between two adjacent antennas 110. However, the lengths of two of the five electromagnetic gap structures 100 are parallel to the extension direction of the transmission lines of each antenna 110, and the widths of the other three electromagnetic gap structures 100 are parallel to the extension direction of the transmission lines of each antenna 110. The arrangement of the electromagnetic bandgap structures 100 in this embodiment can be adjusted according to actual conditions to further improve the electromagnetic isolation between adjacent antennas 110. This embodiment does not impose specific limitations.

[0079] Optionally, the bottom metal layer 400 includes a reference ground cell; wherein the vertical projection of the electromagnetic bandgap structure 100 onto the plane of the reference ground cell at least partially overlaps with the reference ground cell.

[0080] In this embodiment, the radio frequency antenna structure does not need to be set with a complete reference ground. That is, based on the requirements, only a partial or even no reference ground layer needs to be set. In other words, the radio frequency antenna structure in this application does not need to be grounded, which can achieve better electromagnetic isolation between antennas, thereby greatly improving the flexibility of the distribution of radio frequency antenna structure.

[0081] It should be noted that, Figure 9 , Figure 10 and Figure 12 The diagram shown is merely an example of a radio frequency antenna structure. Any radio frequency antenna structure that can use the electromagnetic bandgap structure provided in the above embodiments to filter out radio frequency coupling signals of the corresponding frequency falls within the scope of this invention.

[0082] This technical solution improves the quality of received signals by effectively filtering out radio frequency coupling signals at a specified frequency through the application of an electromagnetic bandgap structure in the radio frequency antenna structure.

[0083] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An electromagnetic bandgap structure, characterized by The EBG structure has a band gap isolation region and a peripheral metal region arranged around the band gap isolation region, and comprises: a peripheral metal sheet arranged in the peripheral metal region; a capacitance pattern; the capacitance pattern comprises at least one first capacitance pattern and at least one second capacitance pattern; an inductance pattern; the inductance pattern is shaped as a zigzag or an arc; the first capacitance pattern is arranged within an area defined by the inductance pattern; wherein the first capacitance pattern is connected with the inductance pattern; the second capacitance pattern comprises an interdigital structure, the interdigital structure comprises a first interdigital unit and a second interdigital unit; the first interdigital unit is nested in the second interdigital unit; the interdigital structure is connected with the peripheral metal sheet through the first interdigital unit; the inductance pattern is connected with the second interdigital unit.

2. The EBG structure of claim 1, wherein, The first capacitance pattern comprises two straight line segments; the two straight line segments are parallel to each other; the band gap isolation region is shaped as a square, a circle or an ellipse.

3. The EBG structure of claim 1, wherein, The first interdigital unit comprises a strip-shaped protrusion, and the second interdigital unit comprises a U-shaped recess; wherein one end of the strip-shaped protrusion is connected with the peripheral metal sheet, and the other end is inserted into the U-shaped recess.

4. The EBG structure of claim 3, wherein, The second interdigital unit further comprises two parallel strip-shaped structures; one end of the strip-shaped protrusion is connected with the peripheral metal sheet, and the other end is inserted into an area between the two parallel strip-shaped structures; wherein the second interdigital unit structure between adjacent interdigital structures is different.

5. A radio frequency antenna structure, characterized by comprises: at least two antennas; and The EBG structure of any one of claims 1-4; wherein at least one EBG structure is arranged between two adjacent antennas.

6. The radio frequency antenna structure of claim 5, wherein, The EBG structure and the at least two antennas are arranged in the same metal layer.

7. The radio frequency antenna structure of claim 6, wherein, Further comprising a bottom metal layer, a dielectric layer and a top metal layer stacked in sequence; wherein the EBG structure and the at least two antennas are arranged in the top metal layer.

8. The radio frequency antenna structure of claim 7, wherein, The bottom metal layer comprises a reference ground unit; wherein a vertical projection of the EBG structure on a plane where the reference ground unit is located at least partially overlaps with the reference ground unit.

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