Antenna structure, printed circuit, radar sensor chip

Abstract

An antenna structure, printed circuit, and radar sensor chip are disclosed. The antenna structure includes: a coplanar waveguide feeding structure for providing electromagnetic wave signals, and a substrate integrated waveguide resonant cavity for radiating electromagnetic wave signals. The substrate integrated waveguide resonant cavity is formed by a first metal layer, a second metal layer, and metallized vias connecting the first and second metal layers. The substrate integrated waveguide resonant cavity is a single, integral space. The first metal layer of the substrate integrated waveguide resonant cavity has at least two slot radiating sections, each slot radiating section including at least two slot elements arranged along a first direction, and the slot radiating sections are arranged along a second direction. The coplanar waveguide feeding structure includes at least one feeding section coupled to the substrate integrated waveguide resonant cavity to transmit a feeding signal to the substrate integrated waveguide resonant cavity. The feeding section in the coplanar waveguide feeding structure feeds the slot radiating sections adjacent to it.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of antenna technology, and in particular to an antenna structure, printed circuit, and radar sensor chip. Background Technology

[0002] In recent years, with the development of wireless communication, antenna encapsulation technology has undoubtedly become a major trend. Antenna encapsulation technology integrates antennas into chip package structures, achieving more integrated and miniaturized systems. In particular, since millimeter-wave bands are widely used in 5G technology, and because millimeter-wave bands have higher transmission losses, there is a need to achieve higher-gain millimeter-wave antennas to meet the high-capacity demands of mobile communication in the 5G era.

[0003] In the packaging design of millimeter-wave antennas, due to the large dielectric loss factor and the fact that microstrip feeding structures in the millimeter-wave band are prone to radiation, which will aggravate the loss, array antennas are often used to achieve high-gain antenna systems.

[0004] However, in order to realize an array antenna, a power divider network needs to be designed. The more array antenna elements there are, the more complex the structure of the feed network becomes, and the greater the loss becomes. Summary of the Invention

[0005] This disclosure provides an antenna structure, printed circuit, and radar sensor chip, achieving a simple structure, small size, and low loss.

[0006] On one hand, this disclosure provides an antenna structure, including a coplanar waveguide feeding structure for providing electromagnetic wave signals, and a substrate integrated waveguide resonant cavity for radiating the electromagnetic wave signals, wherein: the substrate integrated waveguide resonant cavity is formed by a first metal layer, a second metal layer, and metallized vias connecting the first metal layer and the second metal layer; the substrate integrated waveguide resonant cavity is a single space; the first metal layer of the substrate integrated waveguide resonant cavity is provided with at least two slot radiating portions, each slot radiating portion including at least two slot elements arranged along a first direction; the slot radiating portions are arranged along a second direction, the first direction and the second direction being perpendicular to each other; the coplanar waveguide feeding structure includes at least one feeding portion, the feeding portion being coupled to the substrate integrated waveguide resonant cavity to transmit a feeding signal to the substrate integrated waveguide resonant cavity; the feeding portion in the coplanar waveguide feeding structure feeds the slot radiating portion adjacent to the feeding portion.

[0007] In an exemplary embodiment, each slit radiating portion includes a first sub-radiating portion and a second sub-radiating portion, the first sub-radiating portion and the second sub-radiating portion are arranged along a second direction, each sub-radiating portion includes at least one slit unit extending along a first direction, the slit units in the first sub-radiating portion and the slit units in the second sub-radiating portion are alternately arranged, the center line of the slit unit in the first sub-radiating portion along the first direction is a first center line, the center line of the slit unit in the second sub-radiating portion along the first direction is a second center line, and the first center line and the second center line do not coincide.

[0008] In an exemplary embodiment, two adjacent slit radiating portions are symmetrical about the center line between the two slit radiating portions.

[0009] In an exemplary embodiment, the feeding portion in the coplanar waveguide feeding structure is disposed on the first metal layer of the substrate integrated waveguide resonant cavity.

[0010] In an exemplary embodiment, in the first metal layer, each of the feed portions extends into the substrate integrated waveguide resonant cavity by a length equal to 1 / 2 of the waveguide wavelength.

[0011] In an exemplary embodiment, in the substrate integrated waveguide resonant cavity, the feeding portion in the coplanar waveguide feeding structure is located between two adjacent slot radiating portions.

[0012] In an exemplary embodiment, every two adjacent slot radiators share one power supply, and / or every three adjacent slot radiators share two power supply.

[0013] In an exemplary embodiment, the power supply section includes a power supply section, a connecting section, and a coupling section connected in sequence. One end of the power supply section extends along the first direction and into the substrate integrated waveguide resonant cavity, and the other end is connected to the coupling section through the connecting section. The coupling section is used to connect the power supply signal.

[0014] In an exemplary embodiment, in the first metal layer, the electron feed portion of each feed unit extends into the substrate integrated waveguide resonant cavity by a length equal to 1 / 2 waveguide wavelength.

[0015] In an exemplary embodiment, in two adjacent feed sections, the two connecting subsections are of the same length, or the lengths of the two connecting subsections differ by 1 / 2 waveguide wavelength.

[0016] In an exemplary embodiment, the coupling sub-part is connected to the feed source to obtain a feed signal, or obtains a feed signal through coupling.

[0017] In an exemplary embodiment, in the substrate integrated waveguide resonant cavity, every three adjacent slot radiating sections share two feed sections, and the connecting subsections of the two feed sections have the same length; or, in the substrate integrated waveguide resonant cavity, every four adjacent slot radiating sections share two feed sections, and the connecting subsections of the two feed sections differ in length by 1 / 2 wavelength.

[0018] In an exemplary embodiment, the substrate-integrated waveguide resonant cavity includes a first slit radiating section, a second slit radiating section, a third slit radiating section, and a fourth radiating section; the coplanar waveguide feeding structure includes a first feeding section and a second feeding section; wherein: the feeding section of the first feeding section is located between the first slit radiating section and the second slit radiating section, the feeding section of the second feeding section is located between the third slit radiating section and the fourth slit radiating section, the feeding section of the first feeding section and the feeding section of the second feeding section have the same length, and the length of the connecting subsection of the first feeding section and the connecting subsection of the second feeding section differs by 1 / 2 wavelength.

[0019] In an exemplary embodiment, the substrate-integrated waveguide resonant cavity includes a first slot radiating section, a second slot radiating section, a third slot radiating section, a fourth slot radiating section, a fifth slot radiating section, and a sixth slot radiating section; the coplanar waveguide feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section; wherein: the feeding section of the first feeding section is located between the first slot radiating section and the second slot radiating section, the feeding section of the second feeding section is located between the second slot radiating section and the third slot radiating section, the feeding section of the third feeding section is located between the fourth slot radiating section and the fifth slot radiating section, and the feeding section of the fourth feeding section is located between the fifth slot radiating section and the sixth slot radiating section; the four feeding sections of the first feeding section, the second feeding section, the third feeding section, and the fourth feeding section have the same length; the four connecting subsections of the first feeding section, the second feeding section, the third feeding section, and the fourth feeding section have the same length.

[0020] In an exemplary embodiment, the coupling sub-parts of the first power supply unit and the fourth power supply unit are directly connected to the power supply signal; the coupling sub-part of the second power supply unit extends parallel to the coupling sub-part of the first power supply unit and obtains the power supply signal through coupling; the coupling sub-part of the third power supply unit extends parallel to the coupling sub-part of the fourth power supply unit and obtains the power supply signal through coupling.

[0021] In an exemplary embodiment, the substrate-integrated waveguide resonant cavity includes a first slot radiating section, a second slot radiating section, a third slot radiating section, a fourth slot radiating section, a fifth slot radiating section, a sixth slot radiating section, a seventh slot radiating section, and an eighth slot radiating section; the coplanar waveguide feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section; wherein: the electron feeding section of the first feeding section is located between the first slot radiating section and the second slot radiating section, and the electron feeding section of the second feeding section is located between the third slot radiating section and the fourth slot. Between the radiating sections, the electron feed section of the third feed section is located between the fifth and sixth slit radiating sections, and the electron feed section of the fourth feed section is located between the seventh and eighth slit radiating sections. The four electron feed sections of the first, second, third, and fourth feed sections have the same length. The lengths of the two connecting subsections in the first and second feed sections differ by 1 / 2 wavelength, and the lengths of the two connecting subsections in the third and fourth feed sections differ by 1 / 2 wavelength.

[0022] In an exemplary embodiment, the coupling sub-parts of the first power supply unit and the fourth power supply unit are directly connected to the power supply signal; the coupling sub-part of the second power supply unit extends parallel to the coupling sub-part of the first power supply unit and obtains the power supply signal through coupling; the coupling sub-part of the third power supply unit extends parallel to the coupling sub-part of the fourth power supply unit and obtains the power supply signal through coupling.

[0023] In an exemplary embodiment, the substrate-integrated waveguide resonant cavity has a length of 2-8 times the waveguide wavelength in the second direction.

[0024] On the other hand, this disclosure also provides a printed circuit board including the millimeter-wave antenna packaging structure of any of the above embodiments.

[0025] Furthermore, this disclosure also provides a radar sensor chip, including the antenna structure of any of the above embodiments.

[0026] Compared with related technologies, the antenna structure provided in this disclosure has one and only one SIW resonant cavity, and the space inside the cavity is a whole structure. That is, no copper pillars are set inside the cavity, the space inside the cavity is not cut or divided, and multiple slot radiating parts do not need to be isolated by metallized through holes, which can reduce the antenna size. Furthermore, the CPW feeding structure can reduce transmission loss.

[0027] Other features and advantages of this disclosure will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the disclosure. Other advantages of this disclosure may be realized and obtained by means of the methods described in the description and the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings are used to provide an understanding of the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0029] Figure 1 This is a schematic diagram of the coupling of an antenna structure according to an embodiment of the present disclosure;

[0030] Figure 2 This is a top view of an antenna structure according to an embodiment of the present disclosure;

[0031] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0032] Figure 4 This is a schematic diagram of the radiating section structure of the slit in an embodiment of this disclosure;

[0033] Figure 5 This is a schematic diagram of the CPW power supply structure according to an embodiment of this disclosure;

[0034] Figure 6 This is a side view of the chip packaging structure according to an embodiment of the present disclosure;

[0035] Figure 7 This is a schematic diagram of the simulation results of the TE40 module structure according to an embodiment of this disclosure;

[0036] Figure 8 This is an electric field distribution diagram of a CPW feed structure according to an embodiment of the present disclosure;

[0037] Figure 9 This is an electric field distribution diagram of the CPW feeding structure when the second sub-part 1112 is half a wavelength longer than the fourth sub-part 1122 according to an embodiment of this disclosure;

[0038] Figure 10 This is an electric field distribution diagram of the CPW feeding structure when the second sub-section 1112 and the fourth sub-section 1122 have the same length, according to an embodiment of this disclosure.

[0039] Figure 11 This is a schematic diagram of the CPW power supply structure according to an embodiment of this disclosure;

[0040] Figure 12 This is a schematic diagram of another CPW power supply structure according to an embodiment of this disclosure;

[0041] Figure 13 A schematic diagram of a radar sensor provided in an embodiment of this disclosure;

[0042] Figure 14 This is a schematic diagram of another radar sensor provided in an embodiment of this disclosure. Detailed Implementation

[0043] This disclosure describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0044] This disclosure includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this disclosure may also be combined with any conventional features or elements to form a unique solution as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other solutions to form another unique solution as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0045] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that the method or process does not depend on the specific order of steps described herein. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims relating to the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments disclosed herein.

[0046] In chip architecture, the signal output of a chip is in the form of Ground-Signal-Ground (GSG), therefore its output port is usually in the form of a coplanar waveguide (Cost Per Wear, CPW). Typically, to feed the packaged antenna radiating elements, the CPW needs to be converted into a stripline or similar form. The transmission conversion structure is usually not perfectly matched, easily leading to energy loss. Furthermore, when designing multi-element feed networks, matching structures are also required, further exacerbating energy loss.

[0047] Therefore, this disclosure provides an antenna structure, such as... Figure 1 and Figure 2 As shown, the antenna structure includes: a coplanar waveguide feed structure 11 for providing electromagnetic wave signals, and a substrate integrated waveguide (SIW) resonant cavity 12 for radiating the electromagnetic wave signals. The SIW resonant cavity 12 is formed by a first metal layer, a second metal layer, and metallized vias connecting the first and second metal layers. The SIW resonant cavity is a single, integral space. The first metal layer of the SIW resonant cavity has at least two slotted radiating sections. Figure 2 The diagram shows multiple slot radiating sections 21, each of which includes at least two slot elements arranged along a first direction X, and the slot radiating sections are arranged along a second direction Y, the first direction and the second direction being perpendicular to each other; the coplanar waveguide feeding structure includes at least one feeding section ( Figure 2 The diagram shows two feed sections 111 and 112, which are coupled to the substrate integrated waveguide resonant cavity 12 to transmit electrical signals to the substrate integrated waveguide resonant cavity 12. The feed section in the coplanar waveguide feed structure feeds the slot radiating section adjacent to it. For ease of description, the coplanar waveguide feed structure will be referred to as the CPW feed structure, and the substrate integrated waveguide resonant cavity will be referred to as the SIW resonant cavity.

[0048] In this embodiment, the CPW feed structure is coupled between a signal transceiver (such as a signal generator and / or signal receiver) and a radiating structure, i.e., the SIW resonant cavity, to transmit changing electrical signals. For example, the CPW feed structure transmits the changing electrical signal output by the signal generator to the SIW resonant cavity, allowing the SIW resonant cavity to generate electromagnetic waves using the changing electrical signal, for example, by combining electromagnetic waves through multiple radiating slots of the SIW resonant cavity. Alternatively, the SIW resonant cavity converts electromagnetic waves from free space into changing electrical signals and transmits them to the signal receiver via the CPW feed structure.

[0049] Figure 3 for Figure 2 Cross-sectional view along the AA direction, as shown Figure 2 and Figure 3As shown, in this embodiment, the SIW resonant cavity includes a first metal layer 121, a dielectric layer 122, and a second metal layer 123 arranged sequentially. The dielectric layer 122 is provided with copper pillars 124 arranged at equal intervals. The copper pillars 124 are connected to the first metal layer 121 and the second metal layer 123 respectively. Multiple copper pillars arranged at equal intervals form a metallized via strip. The first metal layer, the metallized via strip, and the second metal layer form the SIW resonant cavity. The shape of the resonant cavity is determined by the shape of the metal via strip. In this embodiment, a rectangular projection shape of the resonant cavity is used as an example. In other embodiments, it can also be a square or other regular shape. In this embodiment, the SIW resonant cavity has one and only one cavity, and the space inside the cavity is a single structure. That is, no copper pillars are placed inside the cavity, and the space inside the cavity is not divided or segmented. Multiple slotted radiating parts do not require metallized via isolation, resulting in a simple structure that can reduce antenna size. Furthermore, feeding through a CPW feeding structure can reduce transmission loss. Furthermore, higher-order TE mode electric field modes can be formed through the CPW feeding structure and an integral SIW resonant cavity.

[0050] In an exemplary embodiment, the power supply section (111 and 112) and the slot radiation section 21 are both disposed on the first metal layer of the SIW resonant cavity.

[0051] In an exemplary embodiment, an opening is provided at the orthogonal projection position of the feed section in the second metal layer, meaning that no grounded metal layer can be provided below the feed section, so that the feed section constitutes a groundless coplanar waveguide. For example, if both the feed section and the slot radiating section are provided in the first metal layer of the SIW resonant cavity, then as... Figure 2 As shown, the portion of the power supply located outside the SIW resonant cavity has an opening 125 at the orthogonal projection position of the second metal layer. In this example, the opening is rectangular. In other embodiments, the opening shape can be trapezoidal or other quadrilateral structures, as long as the portion of the power supply located outside the SIW resonant cavity has no metal layer at the projection position of the second metal layer.

[0052] like Figure 2 As shown, in the SIW resonant cavity, the feed section in the CPW feed structure is located between two adjacent slit radiating sections.

[0053] To achieve power feeding, when multiple slot radiators and multiple power feeding units are included, one or more of the following power feeding methods can be adopted: every two adjacent slot radiators share one power feeding unit; every three adjacent slot radiators share two power feeding units.

[0054] For example, the SIW resonant cavity includes a first slit radiating section and a second slit radiating section; the CPW feeding structure includes a first feeding section located between the first slit radiating section and the second slit radiating section, for feeding power to both the first slit radiating section and the second slit radiating section. In this example, two adjacent slit radiating sections share a single feeding section.

[0055] For example, the SIW resonant cavity includes a first slit radiator, a second slit radiator, and a third slit radiator; the CPW feeding structure includes a first feeding section and a second feeding section. The first feeding section is located between the first and second slit radiators and is used to feed power to both the first and second slit radiators. The second feeding section is located between the second and third slit radiators and is used to feed power to both the second and third slit radiators. In this example, the three adjacent slit radiators share two feeding sections.

[0056] For example, the SIW resonant cavity includes a first slit radiator, a second slit radiator, a third slit radiator, and a fourth radiator; the CPW feeding structure includes a first feeding section and a second feeding section. The first feeding section is located between the first and second slit radiators and is used to feed power to the first and second slit radiators. The second feeding section is located between the third and fourth slit radiators and is used to feed power to the third and fourth slit radiators. In this example, every two adjacent slit radiators share one feeding section.

[0057] For example, the SIW resonant cavity includes a first slit radiator, a second slit radiator, a third slit radiator, a fourth slit radiator, and a fifth slit radiator; the CPW feeding structure includes a first feeding section, a second feeding section, and a third feeding section. The first feeding section is located between the first and second slit radiators and is used to feed power to the first and second slit radiators. The second feeding section is located between the second and third slit radiators and is used to feed power to the second and third slit radiators. The third feeding section is located between the fourth and fifth slit radiators and is used to feed power to the fourth and fifth slit radiators. In this example, the three adjacent slit radiators (first, second, and third) share two feeding sections, and the two adjacent slit radiators (fourth and fifth) share one feeding section.

[0058] For example, the SIW resonant cavity includes a first slit radiator, a second slit radiator, a third slit radiator, a fourth slit radiator, a fifth slit radiator, and a sixth slit radiator; the CPW feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section. The first feeding section is located between the first slit radiator and the second slit radiator and is used to feed power to the first slit radiator and the second slit radiator. The second feeding section is located between the second slit radiator and the third slit radiator and is used to feed power to the second slit radiator and the third slit radiator. The third feeding section is located between the fourth slit radiator and the fifth slit radiator and is used to feed power to the fourth slit radiator and the fifth slit radiator. The fourth feeding section is located between the fifth slit radiator and the sixth slit radiator and is used to feed power to the fifth slit radiator and the sixth slit radiator. In this example, the three adjacent slot radiators, namely the first slot radiator, the second slot radiator, and the third slot radiator, share two power supply sections, and the three adjacent slot radiators, namely the fourth slot radiator, the fifth slot radiator, and the sixth slot radiator, also share two power supply sections.

[0059] For example, the SIW resonant cavity includes a first slit radiator, a second slit radiator, a third slit radiator, a fourth slit radiator, a fifth slit radiator, a sixth slit radiator, a seventh slit radiator, and an eighth slit radiator; the CPW feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section. The first feeding section is located between the first and second slit radiators and is used to feed power to the first and second slit radiators. The second feeding section is located between the third and fourth slit radiators and is used to feed power to the third and fourth slit radiators. The third feeding section is located between the fifth and sixth slit radiators and is used to feed power to the fifth and sixth slit radiators. The fourth feeding section is located between the seventh and eighth slit radiators and is used to feed power to the seventh and eighth slit radiators. In this example, every two adjacent slit radiators share a single feeder.

[0060] Figure 4This is a schematic diagram of the slit radiating section structure according to an embodiment of the present disclosure. In this example, four slit radiating sections 21-1, 21-2, 21-3, and 21-4 are shown. Each slit radiating section includes a first sub-radiating section 211 and a second sub-radiating section 212. Each sub-radiating section includes at least one slit unit 22 extending along the first direction X (only two are shown as examples in the figure). To ensure that the electric field radiated by the slit radiating section is in the same direction, the slit units in the first sub-radiating section 211 and the slit units in the second sub-radiating section 212 are alternately arranged. Multiple slit units in the first sub-radiating section 211 coincide along the center line of the first direction X, which is the first center line C1. Multiple slit units in the second sub-section 212 coincide along the center line of the first direction X, which is the second center line C2. The first center line and the second center line do not coincide, such as the first center line C1 and the second center line C2 being parallel to each other. Optionally, the distance between C1 and C2 in each slit radiating section is the same. Optionally, the radial portions of two adjacent slits are symmetrical about the center line between the two slits, such as... Figure 4 As shown, the slit radiating parts 21-1 and 21-2 are symmetrical along the center line between 21-1 and 21-2, the slit radiating parts 21-2 and 21-3 are symmetrical along the center line between 21-2 and 21-3, and the slit radiating parts 21-3 and 21-4 are symmetrical along the center line between 21-3 and 21-4.

[0061] The slotted units in each sub-radiating section are strip-shaped, extending along a first direction, with the long side of the strip extending along the first direction. For example... Figure 4 As shown, in this embodiment, the gap unit is rectangular; in other embodiments, the gap unit can be other shapes.

[0062] In an exemplary embodiment, the length of the SIW resonant cavity in the second direction (e.g.) Figure 2 In this context, d2) can be 2-8 times the waveguide wavelength. For example, when the SIW resonator width is 2 times the waveguide wavelength, it can be used with a CPW to achieve the TE20 mode; when the SIW resonator width is 3 times the waveguide wavelength, it can be used with a CPW to achieve the TE30 mode; when the SIW resonator width is 4 times the waveguide wavelength, it can be used with a CPW to achieve the TE40 mode; when the SIW resonator width is 5 times the waveguide wavelength, it can be used with a CPW to achieve the TE50 mode; when the SIW resonator width is 6 times the waveguide wavelength, it can be used with a CPW to achieve the TE60 mode; when the SIW resonator width is 7 times the waveguide wavelength, it can be used with a CPW to achieve the TE70 mode; and when the SIW resonator width is 8 times the waveguide wavelength, it can be used with a CPW to achieve the TE80 mode.

[0063] In an exemplary embodiment, the feeding section may include a feeding electronics section, a connecting subsection, and a coupling subsection connected in sequence. The coupling subsection is used to obtain a feeding signal (e.g., by directly or indirectly connecting to a feed source). The feeding electronics section is used to transmit the feeding signal generated by the coupling subsection to the substrate integrated waveguide resonant cavity. The connecting subsection is connected between the feeding electronics section and the coupling subsection and is used to control the electric field direction of the feeding signal. For example, as... Figure 2 As shown, the coupling sub-sections of the power supply units (111 and 112) are directly connected to the feed source (not shown in the figure) to obtain the power supply signal.

[0064] In an exemplary embodiment, the length of the feed section extending into the SIW resonant cavity of each feed section (e.g., 111 and 112) is the same, which is d1.

[0065] In an exemplary embodiment, the boundary of the metallized via strip near the power supply section can be set as a reference line, such as... Figure 2 If P is the distance d1 from which the electron feed section penetrates into the SIW resonant cavity, then d1 can be 1 / 2 waveguide wavelength.

[0066] In an exemplary embodiment, the lengths of the connecting portions in the plurality of feed sections may be the same or different. For example, the lengths of the two connecting sub-sections in two adjacent feed sections may be the same, or their lengths may differ by 1 / 2 waveguide wavelength. Figure 2 As shown, the lengths of the connecting subsections of the power supply sections 111 and 112 differ by 1 / 2 wavelength.

[0067] Figure 5 This is a schematic diagram of a CPW power supply structure according to an embodiment of the present disclosure, as shown below. Figure 2 and Figure 5 As shown, the CPW feeding structure is a slot structure, including a first feeding section 111 and a second feeding section 112. The first feeding section 111 includes a first sub-section 1111 (i.e., the electron feed section) extending into the SIW resonant cavity along a first direction, a second sub-section 1112 (i.e., the connecting sub-section) extending in a second direction and connected to the first sub-section 1111, and a third sub-section 1113 (i.e., the coupling sub-section) connected to the second sub-section 1112. The coupling sub-section is used to connect to a feed source (e.g., a signal transceiver). The second feeding section 112 includes a fourth sub-section 1121 (i.e., the electron feed section) extending into the SIW resonant cavity along the first direction, a fifth sub-section 1122 (i.e., the connecting sub-section) extending in the opposite direction of the second direction and connected to the fourth sub-section 1121, and a sixth sub-section 1123 (i.e., the coupling sub-section) connected to the fifth sub-section 1122.

[0068] like Figure 5As shown, the first sub-part 1111 and the fourth sub-part 1121 have the same length. Optionally, the length difference between the second sub-part 1112 and the fifth sub-part 1122 can be 1 / 2 wavelength (to achieve the TE40 mode), or the two can have the same length (to achieve the TE30 mode). Figure 5 The portion marked d1 represents the part of the electron feed section that extends into the SIW resonant cavity. This example is merely one illustration of the connection sub-trace routing; in other embodiments, the routing shape of the connection sub-trace can vary in various ways, such as a broken line or a curve.

[0069] Figure 6 The image shows a side view of an exemplary chip package structure. The packaged antenna array includes a first metal layer 121, a dielectric layer 122, and a second metal layer 123. The metal layer can also be referred to as a redistribution layer (RDL), and the dielectric layer can also be referred to as a molded plastic (MC) layer. The CPW feed layer is located on the first metal layer 121, and the slot radiating portion is located on either the first metal layer 121 or the second metal layer 123. The SIW sidewalls are formed by copper pillars 124. A pin 23 (in this example, a solder ball) can be provided on the side of the second metal layer 123 away from the first metal layer 121. The chip package structure is connected to a third metal layer 24 on the printed circuit board 25 through this pin 23. A sensor chip (die) 26 can also be disposed inside the chip package structure. A top view of the chip package structure is shown below. Figure 2 As shown, the radiating structure of the slit can be as follows: Figure 4 As shown.

[0070] In related technologies, to achieve a TE40 mode transmission mode, four SIW resonant cavities need to be designed, each cavity implementing a TE10 mode, and the TE40 mode is achieved by merging the four cavities. For example, a 1×4 array for propagating the TE10 mode is first designed, and then the four 1×4 arrays are merged to obtain a 4×4 slot array. However, this 4×4 slot array requires four independent cavities. The structure of the embodiment disclosed in this paper, with... Figure 2 and Figure 4 Taking the structure of the slot radiator shown as an example, since four slot radiators are used, each including four slot elements, a high-gain array antenna can be realized. The feeding structure uses a CPW feeding structure input, with the connecting sub-sections of the two feed sections differing by half a wavelength. When the two feed sub-sections enter the SIW resonant cavity, a TE40 mode transmission mode can be formed. The electric field distribution of the TE40 mode is as follows... Figure 7As shown, this achieves a power divider feed network structure similar to a 1-to-4 splitter from CPW to SIW. The feed network implemented using this method requires only one cavity to achieve the TE40 mode, resulting in a simpler and more compact structure. This reduces chip size, facilitating miniaturized antenna systems. Furthermore, the elimination of a power divider and the shorter feed path lead to relatively lower transmission loss and improved gain.

[0071] The CPW feed structure includes multiple feed sections, each of which is a slot structure. In the SIW resonant cavity, every four adjacent slot radiators can share two feed sections, and the lengths of the connecting subsections of the two feed sections can differ by 1 / 2 wavelength. Taking an SIW resonant cavity with four slot radiators as an example, the electric field distribution of the slot structure of the feed section in the CPW feed structure is as follows: Figure 8 As shown, this represents horizontal polarization. When the feed signal enters the SIW cavity from the CPW, the horizontally polarized electric field transforms into vertically polarized electric field. Simultaneously, the electric fields on both sides of the gap structure of the two feed units reverse direction, forming a 180° reverse electric field, thus realizing the conversion from the CPW electric field mode to the SIW's TE mode. Figure 8 From the electric field distribution shown, the electric field directions of the two feed section slot structures are opposite. Therefore, when the slot structure of one of the connecting sub-sections of the two feed sections is extended by half a wavelength (specifically to...), Figure 5 The second sub-section 1112 in the first feed section 111 is half a wavelength further away than the fifth sub-section 1122 in the second feed section 112, so that the electric fields formed by the two feed sections entering the SIW cavity with a length difference of half a wavelength are exactly in the same direction. After the feed signal enters the SIW cavity, the vertically polarized electric fields transformed by the two unidirectional slot structures are in the same direction, thereby realizing the electric field mode of the TE40 mode, as shown in the figure. Figure 9 As shown, the simulation results of the CPW to SIW TE40 module structure are as follows: Figure 7 As shown. At this time, the width of the SIW cavity is about 4 times that of the TE10 mode resonator. The width of the TE10 mode resonator is usually between 0.5 and 1 times the waveguide wavelength. When the SIW resonator includes 4n slit radiating sections, where n is a positive integer greater than or equal to 1, the process of forming the electric field is similar and will not be described in detail here.

[0072] In an exemplary embodiment, in the SIW resonant cavity, every three adjacent slot radiators can share two feed sections, and the connecting subsections of the two feed sections have the same length. Taking an SIW resonant cavity including three slot radiators as an example, for instance, the second subsection 1112 in the first feed section 111 and the fifth subsection 1122 in the second feed section 112 have the same length. The electric fields formed on both sides of the slot structure of the two feed sections (1111 and 1121) are exactly opposite. After the feed signal enters the SIW cavity, a 180° opposite electric field will be formed on both sides of the slot structure. The vertically polarized electric fields converted by the two opposite slot structures are in opposite directions, thereby realizing the electric field mode of the TE30 mode. The electric field distribution is as follows. Figure 10 At this point, the width of the SIW cavity (i.e., its length along the second direction) is approximately three times that of the TE10 mode resonant cavity. When the SIW resonant cavity includes 3n slit radiating sections, where n is a positive integer greater than or equal to 1, the process of forming the electric field is similar and will not be elaborated here.

[0073] Furthermore, using CPW to generate higher-order TE-mode transmission structures can also enable larger-scale array antennas.

[0074] To achieve the TE60 mode, the SIW resonant cavity includes six slot radiators, and the CPW feeding structure includes four feeding sections. Every three adjacent slot radiators share two feeding sections. The feeding section of the first feeding section is located between the first and second slot radiators; the feeding section of the second feeding section is located between the second and third slot radiators; the feeding section of the third feeding section is located between the fourth and fifth slot radiators; and the feeding section of the fourth feeding section is located between the fifth and sixth slot radiators. All four feeding sections have the same length. Furthermore, to achieve the TE60 mode, all four connecting sections in the four feeding sections have the same length.

[0075] The power supply method can be a combination of direct power supply and indirect coupling power supply. For example, two of the four power supply sections are directly connected to the feed source to obtain the power supply signal, and the other two are coupled to the coupling subsection connected to the feed source to obtain the power supply signal; or, all four coupling subsections of the first, second, third, and fourth power supply sections are connected to the feed source to obtain the power supply signal.

[0076] For example, the CPW feed structure can adopt such as Figure 11 The structure shown includes a third feed section 113, a fourth feed section 114, a fifth feed section 115, and a sixth feed section 116, with six feed radiating sections 21 correspondingly arranged to form a TE60 mode. Wherein:

[0077] The third feed section includes a first sub-segment 1131 extending along a first direction X. One end of the first sub-segment 1131 is configured to connect to a signal transceiver, and the other end of the first sub-segment 1131 is connected to a second sub-segment 1132. The second sub-segment 1132 extends in the opposite direction of a second direction Y and connects to a third sub-segment 1133. The third sub-segment 1133 extends along the first direction and connects to a fourth sub-segment 1134. The fourth sub-segment 1134 extends in the opposite direction of the second direction and connects to a fifth sub-segment 1135. The fifth sub-segment 1135 extends along the first direction and enters the SIW resonant cavity. In the third feed section, the fifth sub-segment 1135 is the feed element, the fourth sub-segment 1134 is the connection sub-segment, and the first sub-segment 1131, the second sub-segment 1132, and the third sub-segment 1133 are coupling sub-segments, wherein the first sub-segment 1131 is used to connect to the feed source, and the second sub-segment 1132 and the third sub-segment 1133 are used to couple with the fourth feed section.

[0078] The fourth feed section includes a fifth sub-segment 1141 extending in the opposite direction to the second direction. The fifth sub-segment 1141 is connected to the sixth sub-segment 1142. The sixth sub-segment 1142 extends in the first direction and is connected to the seventh sub-segment 1143. The seventh sub-segment 1143 extends in the second direction and is connected to the eighth sub-segment 1144. The eighth sub-segment 1144 extends in the first direction and enters the SIW resonant cavity. In the fourth feed section, the eighth sub-segment 1144 is the feed section, the seventh sub-segment 1143 is the connection sub-segment, and the fifth sub-segment 1141 and the sixth sub-segment 1142 are the coupling sub-segments for coupling feed to the third feed section.

[0079] The fifth power supply section is symmetrically arranged with the fourth power supply section and is an integral structure with the fourth power supply section. It includes a ninth sub-segment 1151 extending along a second direction and connected to the fifth sub-segment 1141. The ninth sub-segment 1151 is connected to a tenth sub-segment 1152. The tenth sub-segment 1152 extends along a first direction and is connected to an eleventh sub-segment 1153. The eleventh sub-segment 1153 extends in the opposite direction of the second direction and is connected to a twelfth sub-segment 1154. The twelfth sub-segment 1154 extends along the first direction and enters the SIW resonant cavity. In the fifth power supply section, the twelfth sub-segment 1154 is the power supply section, the eleventh sub-segment 1153 is the connecting sub-segment, and the ninth sub-segment 1151 and tenth sub-segment 1152 are the coupling sub-segments used for coupling power supply to the sixth power supply section.

[0080] The sixth power supply section is symmetrically arranged with the third power supply section, including a thirteenth sub-segment 1161 extending along the first direction X. One end of the thirteenth sub-segment 1161 is configured to be connected to a signal transceiver, and the other end of the thirteenth sub-segment 1161 is connected to the fourteenth sub-segment 1162. The fourteenth sub-segment 1162 extends along the second direction and is connected to the fifteenth sub-segment 1163. The fifteenth sub-segment 1163 extends along the first direction and is connected to the sixteenth sub-segment 1164. The sixteenth sub-segment 1164 extends along the second direction and is connected to the seventeenth sub-segment 1165. The seventeenth sub-segment 1165 extends along the first direction and enters the SIW resonant cavity. In the third power supply section, the seventeenth sub-segment 1165 is the power supply section, the sixteenth sub-segment 1164 is the connection sub-segment, and the thirteenth sub-segment 1161, fourteenth sub-segment 1162 and fifteenth sub-segment 1163 are the coupling sub-segments, wherein the thirteenth sub-segment 1161 is used to connect to the feed source, and the fourteenth sub-segment 1162 and fifteenth sub-segment 1163 are used to couple with the fourth power supply section.

[0081] exist Figure 11 In the example shown, the CPW feed structure includes four feed sections. The third feed section 113 and the sixth feed section 116 are directly connected to the feed source, while the fourth feed section 114 and the fifth feed section 115 are indirectly connected to the feed source. The fourth feed section 114 is coupled to the third feed section 113, and the fifth feed section 115 is coupled to the sixth feed section. Of the four feed sections, the four connecting sub-sections (fourth sub-segment 1134, seventh sub-segment 1143, eleventh sub-segment 1153, and sixteenth sub-segment 1164) are of the same length. In this example, the third feed section 113 and the sixth feed section 116 are symmetrical about the center line C1, and the fourth feed section 114 and the fifth feed section 115 are symmetrical about the center line C1. In other words, the third feed section 113 and the fourth feed section 114 are symmetrical about the fifth feed section 115 and the sixth feed section 116 about the center line C1.

[0082] In other examples, the four coupling sub-parts of the four feed sections can all be connected to the feed source, or the third feed section 113 and the sixth feed section 116 can be indirectly fed, while the fourth feed section 114 and the fifth feed section 115 can be directly connected to the feed source.

[0083] To achieve the TE80 mode, the SIW resonant cavity includes eight slot radiators, and the CPW feeding structure includes four feeding sections. Each pair of adjacent slot radiators shares two feeding sections. The feeding section of the first feeding section is located between the first and second slot radiators; the feeding section of the second feeding section is located between the third and fourth slot radiators; the feeding section of the third feeding section is located between the fifth and sixth slot radiators; and the feeding section of the fourth feeding section is located between the seventh and eighth slot radiators. All four feeding sections have the same length. Furthermore, to achieve the TE80 mode, the lengths of the two connecting subsections in the first and second feeding sections differ by half a wavelength, and the lengths of the two connecting subsections in the third and fourth feeding sections differ by half a wavelength.

[0084] The power supply method can be a combination of direct power supply and indirect coupling power supply. For example, two of the four power supply sections are directly connected to the feed source to obtain the power supply signal, and the other two are coupled to the coupling subsection connected to the feed source to obtain the power supply signal; or, all four coupling subsections of the first, second, third, and fourth power supply sections are connected to the feed source to obtain the power supply signal.

[0085] For example, the CPW feed structure can adopt such as Figure 12 The structure shown is similar to... Figure 11 The structures shown are basically the same, the difference being that... Figure 12 In the example shown, the length of the fourth sub-segment 1134 of the third feed unit is 1 / 2 wavelength longer than the length of the seventh sub-segment 1143 of the fourth feed unit, and the length of the sixteenth sub-segment 1164 of the sixth feed unit is 1 / 2 wavelength longer than the length of the eleventh sub-segment 1153 of the fifth feed unit. Furthermore, the lengths of the fourth sub-segment 1134 and the sixteenth sub-segment 1164 of the sixth feed unit are the same, and the lengths of the seventh sub-segment 1143 and the eleventh sub-segment 1153 of the fifth feed unit are the same. In other embodiments, the third feed unit 113, the fourth feed unit 114, the fifth feed unit 115, and the sixth feed unit 116 are symmetrical about the center line C2. The length of the seventh sub-segment 1143 of the fourth feed unit may be 1 / 2 wavelength longer than the length of the fourth sub-segment 1134 of the third feed unit, and the length of the eleventh sub-segment 1153 of the fifth feed unit may be 1 / 2 wavelength longer than the length of the sixteenth sub-segment 1164 of the sixth feed unit.

[0086] exist Figure 12In the example shown, the third feed section 113 and the sixth feed section 116 are directly connected to the feed source, while the fourth feed section 114 and the fifth feed section 115 are indirectly connected to the feed source. The fourth feed section 114 is coupled to the third feed section 113, and the fifth feed section 115 is coupled to the sixth feed section. In other examples, all four coupling sub-sections of the four feed sections may be connected to the feed source, or the third feed section 113 and the sixth feed section 116 may be indirectly fed, while the fourth feed section 114 and the fifth feed section 115 may be directly connected to the feed source. In this example, the third feed section 113 and the sixth feed section 116 are symmetrical about the center line C2, and the fourth feed section 114 and the fifth feed section 115 are symmetrical about the center line C2. In other words, the third feed section 113 and the fourth feed section 114 are symmetrical about the fifth feed section 115 and the sixth feed section 116 about the center line C2.

[0087] The antenna structure provided in this disclosure utilizes a CPW (Continuous Power Divider) feeding structure to achieve a power divider-like structure. Since no power divider is used, the feed path is shorter, resulting in relatively lower transmission loss and improved gain. Because it employs a monolithic SIW resonant cavity, there are no metallized vias separating multiple slot radiators within the cavity. This allows for smaller spacing between the slot radiators, resulting in a smaller overall cavity size. More slot radiators can be arranged within the same size, which is beneficial for high gain. Therefore, the antenna structure provided in this disclosure is simpler, has lower transmission loss, smaller size, and higher gain.

[0088] This disclosure also provides a printed circuit board including the antenna structure described in any of the above embodiments.

[0089] This disclosure also provides a radar sensor chip, including the antenna structure described in any of the above embodiments. The radar sensor chip, such as... Figure 13 As shown, it may include a signal receiving module, a signal transmitting module, and a clock source. The signal transmitting module is used to transmit electromagnetic wave signals via a transmitting antenna based on the reference frequency provided by the phase-locked loop in the clock source. The signal receiving module uses a receiving antenna to receive the echoes formed by reflections from the target object, and performs down-conversion processing based on the reference frequency provided by the phase-locked loop in the clock source to generate and output an intermediate frequency signal.

[0090] Optionally, in an exemplary embodiment of this disclosure, the frequency-modulated continuous wave signal is a millimeter-wave signal, so that the electronic device can be applied to fields such as autonomous driving, industrial automation, smart home appliances, and security inspection.

[0091] like Figure 14As shown, in an exemplary embodiment, the radar sensor may further include an analog-to-digital conversion module and a signal processing module. Among them, the signal receiving module generates and outputs an intermediate-frequency signal to the analog-to-digital conversion module, and after being processed by the analog-to-digital conversion module, it is transmitted to the signal processing module. The signal processing module is used to perform signal processing on the digital signal output by the analog-to-digital conversion module.

[0092] Figure 13 and Figure 14 The transmitting antenna and the receiving antenna in

[0093] For example, the signal transmitting module generates a chirp signal according to a preset continuous frequency modulation method; obtains a radio frequency transmitting signal through frequency doubling processing, and feeds it to the transmitting antenna to transmit a corresponding detection signal wave. When the detection signal wave is reflected by an object, an echo signal wave is formed. The echo signal wave is converted into a radio frequency receiving signal through the receiving antenna. The signal receiving module is used to perform down-conversion, filtering, analog-to-digital conversion and other processing on the radio frequency receiving signal by using the radio frequency transmitting signal to output a baseband digital signal representing the difference frequency between the detection signal wave and the echo signal wave. The signal processing module is used to extract measurement information from the baseband digital signal through signal processing and output corresponding measurement data. Among them, the signal processing includes performing digital signal processing calculations such as phase, frequency, and time domain on at least one path of the at least one path of待处理信号 (pending processed signal) provided by the receiving antenna. The measurement data includes at least one of the following: distance data for representing the relative distance of at least one detected obstacle; speed data for representing the relative speed of at least one detected obstacle; angle data for representing the relative angle of at least one detected obstacle, etc.

[0094] Optionally, the frequency-modulated continuous wave signal is a millimeter wave signal, and the radar sensor may be an AiP millimeter wave radar chip integrated with an antenna. In other embodiments of the present application, the radar sensor may also be other types of radar chips, and the present application does not limit this.

[0095] In the description of the embodiments of the present disclosure, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "one side", "the other side", "one end", "the other end", "edge", "opposite", "four corners", "perimeter", "the "mouth" character structure", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure.

[0096] It should be noted that there is an unclear expression "待处理信号" in the original text, which is tentatively translated as "pending processed signal". If there is a more accurate expression, it can be adjusted accordingly.In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication between two components. Those skilled in the art can understand the meaning of the above terms in this disclosure according to the circumstances.

[0097] This application describes several embodiments, but these descriptions are exemplary and not restrictive, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0098] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive scheme as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive schemes to form another unique inventive scheme as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this application may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0099] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims concerning the method and / or process should not be limited to the steps performed in the written order, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.

Claims

1. An antenna structure, characterized in that, It includes a coplanar waveguide feed structure for providing electromagnetic wave signals, and a substrate-integrated waveguide resonant cavity for radiating the electromagnetic wave signals, wherein: The substrate integrated waveguide resonant cavity is constructed through a first metal layer, a second metal layer, and metallized vias connecting the first metal layer and the second metal layer. The substrate integrated waveguide resonant cavity is a single space. The first metal layer of the substrate integrated waveguide resonant cavity is provided with at least two slot radiating parts. Each slot radiating part includes at least two slot units arranged along a first direction. The slot radiating parts are arranged along a second direction, and the first direction and the second direction are perpendicular to each other. The coplanar waveguide feeding structure includes at least one feeding section, which is coupled to the substrate integrated waveguide resonant cavity to transmit the feeding signal to the substrate integrated waveguide resonant cavity. The feeding section in the coplanar waveguide feeding structure is located between two adjacent slot radiating sections, and the feeding section in the coplanar waveguide feeding structure feeds the two slot radiating sections adjacent to the feeding section.

2. The antenna structure according to claim 1, characterized in that, Each slit radiating section includes a first sub-radiating section and a second sub-radiating section, which are arranged along a second direction. Each sub-radiating section includes at least one slit unit extending along a first direction. The slit units in the first sub-radiating section and the slit units in the second sub-radiating section are alternately arranged. The center line of the slit unit in the first sub-radiating section along the first direction is the first center line, and the center line of the slit unit in the second sub-radiating section along the first direction is the second center line. The first center line and the second center line do not coincide.

3. The antenna structure according to claim 1 or 2, characterized in that, The radiating parts of two adjacent slits are symmetrical about the center line between the two slits.

4. The antenna structure according to claim 1, characterized in that, The feeding section in the coplanar waveguide feeding structure is disposed on the first metal layer of the substrate integrated waveguide resonant cavity.

5. The antenna structure according to claim 4, characterized in that, In the first metal layer, each of the feed sections extends into the substrate integrated waveguide resonant cavity by a length equal to 1 / 2 of the waveguide wavelength.

6. The antenna structure according to claim 1, characterized in that, Two adjacent slot radiators share one feed section, and / or three adjacent slot radiators share two feed sections.

7. The antenna structure according to claim 6, characterized in that, The power supply section includes a power supply section, a connecting section and a coupling section connected in sequence. One end of the power supply section extends along the first direction and into the substrate integrated waveguide resonant cavity, and the other end is connected to the coupling section through the connecting section. The coupling section is used to connect the power supply signal.

8. The antenna structure according to claim 7, characterized in that, In two adjacent feed sections, the two connecting subsections are of the same length, or the lengths of the two connecting subsections differ by 1 / 2 waveguide wavelength.

9. The antenna structure according to claim 7, characterized in that, The coupling sub-section is connected to the feed source to obtain a feed signal, or obtains a feed signal through coupling.

10. The antenna structure according to claim 8, characterized in that, In the substrate-integrated waveguide resonant cavity, every three adjacent slot radiating sections share two feed sections, and the connecting subsections of the two feed sections have the same length; or In the substrate integrated waveguide resonant cavity, every four adjacent slot radiating sections share two feed sections, and the lengths of the connecting subsections of the two feed sections differ by 1 / 2 wavelength.

11. The antenna structure according to claim 8, characterized in that, The substrate-integrated waveguide resonant cavity includes a first slot radiating section, a second slot radiating section, a third slot radiating section, and a fourth slot radiating section; the coplanar waveguide feeding structure includes a first feeding section and a second feeding section; wherein: The electron feed section of the first feed unit is located between the first slit radiating section and the second slit radiating section, and the electron feed section of the second feed unit is located between the third slit radiating section and the fourth slit radiating section. The electron feed sections of the first feed unit and the second feed unit have the same length, and the lengths of the connecting sub-sections of the first feed unit and the connecting sub-sections of the second feed unit differ by 1 / 2 wavelength.

12. The antenna structure according to claim 8, characterized in that, The substrate-integrated waveguide resonant cavity includes a first slot radiating section, a second slot radiating section, a third slot radiating section, a fourth slot radiating section, a fifth slot radiating section, and a sixth slot radiating section; the coplanar waveguide feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section; wherein: The electron feed section of the first feed unit is located between the first slit radiating section and the second slit radiating section; the electron feed section of the second feed unit is located between the second slit radiating section and the third slit radiating section; the electron feed section of the third feed unit is located between the fourth slit radiating section and the fifth slit radiating section; and the electron feed section of the fourth feed unit is located between the fifth slit radiating section and the sixth slit radiating section. The four electron feed sections of the first feed unit, the second feed unit, the third feed unit, and the fourth feed unit have the same length. The four connecting sub-parts in the first power supply section, the second power supply section, the third power supply section, and the fourth power supply section have the same length.

13. The antenna structure according to claim 12, characterized in that, The coupling sub-parts of the first and fourth power supply units are directly connected to the power supply signal. The coupling sub-part of the second power supply unit extends parallel to the coupling sub-part of the first power supply unit and obtains the power supply signal through coupling. The coupling sub-part of the third power supply unit extends parallel to the coupling sub-part of the fourth power supply unit and obtains the power supply signal through coupling.

14. The antenna structure according to claim 8, characterized in that, The substrate-integrated waveguide resonant cavity includes a first slot radiating section, a second slot radiating section, a third slot radiating section, a fourth slot radiating section, a fifth slot radiating section, a sixth slot radiating section, a seventh slot radiating section, and an eighth slot radiating section; the coplanar waveguide feeding structure includes a first feeding section, a second feeding section, a third feeding section, and a fourth feeding section; wherein: The electron feed section of the first feed unit is located between the first slit radiating section and the second slit radiating section; the electron feed section of the second feed unit is located between the third slit radiating section and the fourth slit radiating section; the electron feed section of the third feed unit is located between the fifth slit radiating section and the sixth slit radiating section; and the electron feed section of the fourth feed unit is located between the seventh slit radiating section and the eighth slit radiating section. The lengths of the electron feed sections in the first feed unit, the second feed unit, the third feed unit, and the fourth feed unit are the same. The lengths of the two connecting sub-sections in the first and second power supply sections differ by 1 / 2 wavelength, and the lengths of the two connecting sub-sections in the third and fourth power supply sections differ by 1 / 2 wavelength.

15. The antenna structure according to claim 14, characterized in that, The coupling sub-parts of the first and fourth power supply units are directly connected to the power supply signal. The coupling sub-part of the second power supply unit extends parallel to the coupling sub-part of the first power supply unit and obtains the power supply signal through coupling. The coupling sub-part of the third power supply unit extends parallel to the coupling sub-part of the fourth power supply unit and obtains the power supply signal through coupling.

16. The antenna structure according to claim 1, characterized in that, The substrate-integrated waveguide resonant cavity has a length of 2-8 times the waveguide wavelength in the second direction.

17. A printed circuit board, characterized in that, The antenna structure includes any one of claims 1-16.

18. A radar sensor chip, characterized in that, The antenna structure includes any one of claims 1-16.

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