Omnidirectional antenna based on waveguide structure and radio frequency module

Abstract

According to the omnidirectional antenna based on the waveguide structure and the radio frequency module provided by the invention, the antenna radiation is arranged on the upper side and the lower side of the PCB, so that the overall antenna radiation can cover a nearly omnidirectional range, and the omnidirectional radiation characteristic of the antenna is realized. The effect of omnidirectional beam coverage can be realized through a single antenna, and the combination stability with the PCB is good, so that the integration level of the whole module is increased, the product size is small, the cost is low, the product shape is regular, and the installation is facilitated; besides, the electromagnetic waves are transmitted through the hollow waveguide transmission path, so that the board selection of the PCB does not need to consider the high-frequency characteristic requirement of the antenna, and only the board of the conventional PCB needs to be considered, the product cost is further reduced, and the module is more economical and practical; finally, the directional diagram of the omnidirectional antenna has high adjustability, customized adjustment and adaptation can be carried out according to application scene requirements, and the market applicability is high.

Description

Technical Field

[0001] The present invention belongs to the field of antenna technology, and in particular relates to an omnidirectional antenna and a radio frequency module based on a waveguide structure, which are particularly suitable for millimeter wave radar and base station systems. Background Art

[0002] An antenna is a device that converts guided electromagnetic waves into radiated electromagnetic waves, or vice versa, and plays a vital role in wireless communications. The antenna's field of view (FOV) is a key parameter of its directional coverage. It refers to the spatial angle range within which the antenna can effectively receive or transmit electromagnetic waves, directly impacting the antenna's detection, communication, or imaging capabilities. For example, radar can only detect targets within the antenna's FOV. Targets outside the FOV may not be detected due to low signal strength. In communications applications, users can only communicate with a base station within the base station's antenna coverage area; outside the coverage area, users cannot communicate with the base station.

[0003] Currently, the FOV (Field of View) range of antennas is limited, especially in base stations and millimeter-wave radar products. Omnidirectional coverage cannot be achieved, which poses a problem in actual application scenarios. Therefore, two or more antenna modules are needed to achieve wide-angle coverage. However, products equipped with multi-module antennas are large in size and high in cost. In addition, multi-module antennas generally have heterogeneous shapes, which is not conducive to installation. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an omnidirectional antenna and radio frequency module based on a waveguide structure, which is used to solve the problems in the prior art of using multiple antenna modules to achieve large-angle coverage, large product size and high cost, and multi-module antennas are generally heterogeneous in shape, which is not conducive to installation.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides an omnidirectional antenna based on a waveguide structure, the omnidirectional antenna comprising: a first metal block, a second metal block and a PCB circuit board; wherein, The first metal block and the second metal block are respectively fixed on the metal layers on two opposite sides of the PCB circuit board; The first metal block and the second metal block are respectively provided with at least one hollow channel on a side close to the PCB circuit board, and the hollow channel forms a hollow waveguide transmission path after being bonded to the PCB circuit board; At least one metallized via is provided on the PCB circuit board, and each of the metallized vias is connected to the upper and lower adjacent hollow channels, and the metallized via can transmit the electromagnetic wave transmitted by the upstream hollow waveguide transmission path to the downstream hollow waveguide transmission path; At least one radiation slot is respectively provided on a side of the first metal block and a side of the second metal block away from the PCB circuit board.

[0006] Optionally, the radiation slit is arranged at a crest of a standing wave formed when the electromagnetic wave is transmitted in the hollow waveguide transmission path.

[0007] Optionally, the first metal block is fixed to the PCB circuit board by screws or welding, and the second metal block is fixed to the PCB circuit board by screws or welding.

[0008] Optionally, the hollow waveguide transmission path transmits TE 10 Mode of electromagnetic waves.

[0009] Optionally, a plurality of the radiation slits are provided on the first metal block, and all of the radiation slits are arranged in an array; and a plurality of the radiation slits are provided on the second metal block, and all of the radiation slits are arranged in an array.

[0010] Optionally, the metallized via is configured as a waveguide hole to transmit electromagnetic waves by waveguide transmission; or the metallized via is configured as a coupled radiation hole to transmit electromagnetic waves by coupled transmission.

[0011] Optionally, a longitudinal waveguide metal block is added to the hollow waveguide transmission path passing through the PCB circuit board to extend the length of the hollow waveguide transmission path.

[0012] The present invention also provides a radio frequency module, which includes: an omnidirectional antenna based on a waveguide structure and a chip package as described in any one of the above items; wherein the chip package is electrically connected to the PCB circuit board of the omnidirectional antenna based on a waveguide structure to transmit the radio frequency signal to the hollow waveguide transmission path of the omnidirectional antenna based on a waveguide structure.

[0013] Optionally, the chip package is a LoP chip, and the LoP chip has a radiation port, which transmits the radio frequency signal directly to the hollow waveguide transmission path through a waveguide transmission hole corresponding to the PCB circuit board; or the radio frequency signal fed out of the chip package is sequentially transmitted through the chip package pins and transmission lines and through the mode conversion structure to the hollow waveguide transmission path.

[0014] Optionally, the radio frequency module is suitable for use in a radar system or a base station system.

[0015] As described above, the omnidirectional antenna and radio frequency module based on the waveguide structure of the present invention fix metal blocks on the upper and lower surfaces of the PCB circuit board and set a hollow channel in the metal block to form a hollow waveguide transmission path after being combined with the PCB circuit board, and the terminal of the hollow waveguide transmission path forms a short-circuit (i.e., closed) state, so that electromagnetic waves will form standing waves in the hollow waveguide transmission path. At this time, based on the radiation principle of the slot antenna, a radiation slot is set at a suitable position on the outer surface of the metal block, and the electromagnetic waves will generate antenna radiation through the radiation slot. Since the hollow waveguide transmission path and the metal block are on the upper and lower sides of the PCB circuit board, radiation slots are set on the metal blocks on the upper and lower sides of the PCB circuit board, and there is antenna radiation on the upper and lower sides of the PCB circuit board. The radiation is on the upper and lower sides of the PCB circuit board, so that the overall antenna radiation can cover a nearly omnidirectional range, realizing the omnidirectional radiation characteristics of the antenna. The omnidirectional antenna of the present invention can achieve the effect of omnidirectional beam coverage with a single antenna, and has good stability in combination with the PCB circuit board, so that the overall integration of the module is increased, resulting in a small product size, low cost, and a regular product shape, which is conducive to installation; in addition, since the present invention transmits electromagnetic waves through a hollow waveguide transmission path, the selection of PCB circuit board material does not need to consider the high-frequency characteristics of the antenna, and conventional PCB circuit board material can be used, which will further reduce product costs and make the module more economical and practical; finally, the directional pattern of the omnidirectional antenna of the present invention has strong adjustability, and can be customized and adapted according to the requirements of the application scenario, and has strong market applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 、 Figure 2 、 Figures 8 to 10 and Figure 12 Shown are cross-sectional views of several examples of the omnidirectional antenna based on the waveguide structure of the present invention.

[0017] Figure 3 A cross-sectional view showing an example of a first metal block in an omnidirectional antenna based on a waveguide structure according to the present invention.

[0018] Figure 4 A cross-sectional view showing an example of a second metal block in the omnidirectional antenna based on a waveguide structure of the present invention.

[0019] Figure 5 A top view of an example of a first metal block in the omnidirectional antenna based on a waveguide structure of the present invention is shown.

[0020] Figure 6 A top view of another example of the first metal block in the omnidirectional antenna based on the waveguide structure of the present invention is shown.

[0021] Figure 7 Shown is a top view of an example of a PCB circuit board in the omnidirectional antenna based on a waveguide structure of the present invention.

[0022] Figure 11 Display as Figure 10 A top view of an example of a first metal block in an omnidirectional antenna based on a waveguide structure.

[0023] Figure 13 and Figure 14 Shown are cross-sectional views of two examples of the radio frequency module of the present invention.

[0024] Component number description 10 First metal block 100 Hollow channel 101 Hollow waveguide transmission path 102 gap 11 Second metal block 12 PCB circuit board 120 Metalized vias 13 Radiation slits 130 Radiation slot area 14 Chip package 140 LOP chip 141 Waveguide transmission hole 142 Chip package pins 143 transmission line 15 Longitudinal waveguide metal block 16 Device DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] In the description of the embodiments of the present application, "at least one" means one or more, "multiple" means two or more, and "multiple rows" means two or more rows, unless otherwise clearly defined.

[0027] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0028] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists.

[0029] In the description of the embodiments of the present application, the technical terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the embodiments of the present application. They are not intended to indicate or imply that the devices or elements referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the embodiments of the present application. For example, if the device or element in the figure is inverted, then an element described as being "below," "beneath," "under," or "below" another element or feature would be oriented "above" or "on top" of the other element or feature. Therefore, the term "below" can encompass both above and below orientations, depending on the context in which the term is used, as will be apparent to one of ordinary skill in the art. Materials can be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatially relative descriptors used herein should be interpreted accordingly.

[0030] See also Figures 1 to 14 It should be noted that the diagrams provided in this embodiment are merely schematic illustrations of the basic concept of the present invention. Therefore, the diagrams only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0031] like Figures 1 to 7 As shown, this embodiment provides an omnidirectional antenna based on a waveguide structure, the omnidirectional antenna comprising: a first metal block 10, a second metal block 11 and a PCB circuit board 12; wherein, The first metal block 10 and the second metal block 11 are respectively fixed on the metal layers on two opposite sides of the PCB circuit board 11; like Figure 1 、 Figure 3 and Figure 4 As shown, at least one hollow channel 100 is respectively provided on one side of the first metal block 10 and the second metal block 11 close to the PCB circuit board 11, and the hollow channel 100 forms a hollow waveguide transmission path 101 after being bonded to the PCB circuit board 11; like Figure 1 and Figure 7 As shown, the PCB circuit board 12 is provided with at least one metallized via 120, and each of the metallized vias 120 is connected to the upper and lower adjacent hollow channels 100, and the metallized vias 120 can transmit the electromagnetic waves (such as Figure 1 The direction of the arrow in the figure represents the transmission path of the electromagnetic wave) is transmitted to the hollow waveguide transmission path 101 downstream; like Figure 1 and Figure 2 As shown, the first metal block 10 and the second metal block 11 are respectively provided with at least one radiation slot 13 on one side away from the PCB circuit board 12. Figure 1 and Figure 2 Both are cross-sectional views of omnidirectional antennas based on waveguide structures. The difference is Figure 1 The radiation slot area 130 is shown, and the radiation slot 13 is not shown. Figure 2 The radiating slots 13 are shown in FIG. Figures 8 to 10 、 Figures 12 to 14 Only the radiation slot area 130 is shown, and the radiation slot 13 is not shown. This is for ease of understanding. In practice, the radiation slot area 130 will form the radiation slot 13.

[0032] The omnidirectional antenna based on a waveguide structure in this embodiment is constructed by fixing metal blocks to the upper and lower surfaces of a PCB circuit board and providing a hollow channel in the metal blocks. This forms a hollow waveguide transmission path after being combined with the PCB circuit board. The terminals of the hollow waveguide transmission path are short-circuited (i.e., closed), causing electromagnetic waves to form standing waves in the hollow waveguide transmission path. Based on the radiation principle of a slot antenna, radiation slots are provided at appropriate locations on the outer surface of the metal block. Electromagnetic waves generate antenna radiation through the radiation slots. Since the hollow waveguide transmission path and the metal blocks are located on the upper and lower sides of the PCB circuit board, radiation slots are provided in the metal blocks on both sides of the PCB circuit board. Antenna radiation occurs on both sides of the PCB circuit board, and the radiation is distributed on both sides of the PCB circuit board. As a result, the overall antenna radiation can cover a nearly omnidirectional range, achieving the antenna's omnidirectional radiation characteristics. The omnidirectional antenna of this embodiment can achieve omnidirectional beam coverage with a single antenna, and has good stability when combined with the PCB circuit board, which increases the overall integration of the module, resulting in a small product size, low cost, and a regular product shape, which is convenient for installation. In addition, since this embodiment transmits electromagnetic waves through a hollow waveguide transmission path, the selection of the PCB circuit board material does not need to consider the high-frequency characteristics of the antenna, and a conventional PCB circuit board material can be used, which will further reduce product costs and make the module more economical and practical. Finally, the directional pattern of the omnidirectional antenna of this embodiment has strong adjustability and can be customized and adapted according to the requirements of the application scenario, and has strong market applicability.

[0033] As an example, electromagnetic waves will form standing waves in the hollow waveguide transmission path 101, so the radiation slits 13 on the first metal block 10 and the second metal block 11 are preferably set at the crest of the standing wave to achieve the best radiation efficiency. Of course, in practice, the setting position of the radiation slit 13 may also be offset from the crest of the standing wave. This may be due to the influence of process accuracy or actual design needs, as long as the radiation efficiency requirements are met.

[0034] As an example, the first metal block 10 and the second metal block 11 can be fixed to the PCB circuit board 12 by existing conventional fixing methods. For example, screw fixing, welding fixing, etc. In addition, the fixing methods between the first metal block 10 and the second metal block 11 and the PCB circuit board 12 can be the same or different. For example, the first metal block 10 and the PCB circuit board 12 are fixed by screws, while the second metal block 11 and the PCB circuit board 12 are fixed by welding, or both are fixed by screws, and the specific selection is made according to actual needs. Furthermore, an electromagnetic band gap structure can be set around the relevant structure, which can further reduce the fixing requirements between the first metal block 10 and / or the second metal block 11 and the PCB circuit board 12.

[0035] As an example, the electromagnetic wave mode transmitted by the hollow waveguide transmission path is generally selected from the electromagnetic wave mode transmitted in the slot antenna, such as TE 10 mode, high-order mode, etc., in this embodiment, TE is preferred 10 model.

[0036] The shapes of the first metal block 10 and the second metal block 11 can be the same or different. In addition, the first metal block 10 and the second metal block 11 can be symmetrically or asymmetrically arranged on the upper and lower sides of the PCB circuit board 12, depending on actual needs.

[0037] The number of the radiation slots 13 can be one or more. According to the radiation principle of the antenna, the radiation slots 13 are set in the area outside the center line of the width direction of the corresponding metal block. It should be noted here that the width direction refers to the X direction in the drawings, and the corresponding length direction refers to the Y direction in the drawings. Figure 5 In the embodiment, two hollow channels 100 are provided on the first metal block 10, and a radiation slit 13 is provided in the area corresponding to each hollow channel 100; Figure 6In the embodiment, two hollow channels 100 are provided on the first metal block 10, and the region corresponding to each hollow channel 100 is provided with multiple radiating slits 13, and the multiple radiating slits 13 are arranged in an array. In another embodiment, one hollow channel 100 is provided on the first metal block 10 or the second metal block 11, and one radiating slit 13 is provided in the region corresponding to the hollow channel 100. Of course, the above is merely an example. In practice, the number of radiating slits 13 provided, and whether an array arrangement is required when multiple radiating slits 13 are provided, can be determined based on actual needs, as long as the radiation principle of the slot antenna is satisfied.

[0038] like Figure 8 As shown, as an example, when a device 16 is formed on the surface of the PCB circuit board 12, such as circuit components such as resistors, capacitors, and inductors or required transmission lines, a hole 102 can be provided on the metal block of the corresponding contact surface to avoid affecting the connection and communication between the chip and the device. Figure 8 The device 16 is arranged on the side of the PCB circuit board 12 facing the second metal block 11, so a hole is dug at the corresponding position of the second metal block 11 to form a gap 102 to isolate the device 16 for avoidance.

[0039] The metallized via 120 can be achieved by setting a through hole in the PCB circuit board 12 and forming a metal conductive layer on the inner wall surface of the through hole to achieve metallization of the through hole. In addition, the metallized via 120 can transmit the electromagnetic wave transmitted by the upstream hollow waveguide transmission path 101 to the downstream hollow waveguide transmission path 101, and the transmission mode can be a waveguide transmission mode or a coupled transmission mode. Figure 8 As shown, the electromagnetic waves transmitted by the upstream hollow waveguide transmission path 101 are transmitted to the downstream hollow waveguide transmission path 101 by waveguide transmission. At this time, the size of the metallized via 120 meets the standard waveguide hole size of the transmitted electromagnetic wave frequency. This is well known in the art and is specifically set according to actual conditions. Figure 12 As shown, the electromagnetic wave radiation transmitted by the upstream hollow waveguide transmission path 101 is transmitted to the downstream hollow waveguide transmission path 101 by coupling transmission. At this time, the size of the metallized via 120 meets the size of the coupled radiation hole, for example Figure 12 The metallized via 120 is set as a slot hole for slot radiation, so that the electromagnetic wave radiation transmitted by the upstream hollow waveguide transmission path 101 is transmitted to the downstream hollow waveguide transmission path 101 through the principle of slot radiation.

[0040] like Figure 10As shown, as an example, a longitudinal waveguide metal block 15 can be added to the hollow waveguide transmission path 101 passing through the PCB circuit board 12 to extend the length of the hollow waveguide transmission path 101. By using this longitudinal waveguide metal block 15, the hollow waveguide transmission path 101 in the corresponding metal block can even be aligned on a plane (such as Figure 11 XY plane in the image) to create a non-straight curved path, such as Figure 11 The curved path is formed into an S-shaped path. The curved path can adjust the spacing between the radiation slots 13 to eliminate the side lobes of the Y-direction radiation pattern.

[0041] As an example, the transmission path of the electromagnetic wave in the hollow waveguide transmission path 101 can also be set to a spatial folding form, such as Figure 9 As shown, a hollow channel 100 is respectively provided on the first metal block 10 and the second metal block 11, and the upper and lower hollow waveguide transmission paths 101 are connected through a metallized via 120, so that the electromagnetic wave enters the hollow waveguide transmission path 101 on the other side of the vertical direction from the hollow waveguide transmission path 101 on one side of the vertical direction through the metallized via 120. The omnidirectional antenna formed in this way is smaller in size.

[0042] like Figure 13 and Figure 14 As shown, based on the omnidirectional antenna based on the waveguide structure disclosed in this embodiment, this embodiment also provides a radio frequency module, which includes: the omnidirectional antenna based on the waveguide structure disclosed in this embodiment and a chip package 14; wherein, the chip package 14 is electrically connected to the PCB circuit board 12 of the omnidirectional antenna based on the waveguide structure to transmit the radio frequency signal to the hollow waveguide transmission path 101 of the omnidirectional antenna based on the waveguide structure.

[0043] In practice, the feeding method of the antenna is adjusted according to the form of the chip package 14. Figure 13 In the embodiment, the chip package 14 is a LoP (Launcher on Package) chip 140, whose package radiation port is directly connected to the waveguide antenna feed point. Figure 13 In the embodiment, the package radiation port of the LOP chip 140 is directly opposite to the interface of the hollow waveguide transmission path 101, and a very short waveguide transmission hole 141 is formed on the PCB circuit board 12 to connect the package radiation port of the LOP chip 140 with the interface of the hollow waveguide transmission path 101, so that the electromagnetic wave fed by the LOP chip 140 is directly transmitted by waveguide to the hollow waveguide transmission path 101. Figure 14 In the figure, the radio frequency signal fed out by the chip package 14 is sequentially transmitted through the chip package pins 142 and the transmission line 143 and then through the mode conversion structure (not shown in the figure) to the hollow waveguide transmission path 101.

[0044] The radio frequency module of this embodiment can be actively and effectively applied in radar systems or base station systems, but is not limited thereto and can also be applied to other electronic systems that require a larger antenna radiation angle.

[0045] In summary, the present invention provides an omnidirectional antenna and radio frequency module based on a waveguide structure. Metal blocks are fixed on the upper and lower surfaces of a PCB circuit board and a hollow channel is provided in the metal block to form a hollow waveguide transmission path after being combined with the PCB circuit board. The terminal of the hollow waveguide transmission path is short-circuited (i.e., closed), so that electromagnetic waves will form standing waves in the hollow waveguide transmission path. At this time, based on the radiation principle of the slot antenna, a radiation slot is provided at a suitable position on the outer surface of the metal block, and the electromagnetic waves will generate antenna radiation through the radiation slot. Since the hollow waveguide transmission path and the metal block are on the upper and lower sides of the PCB circuit board, radiation slots are provided on the metal blocks on the upper and lower sides of the PCB circuit board. Antenna radiation is present on the upper and lower sides of the PCB circuit board, and the radiation is on the upper and lower sides of the PCB circuit board. Therefore, the overall antenna radiation can cover a nearly omnidirectional range, thereby realizing the omnidirectional radiation characteristics of the antenna. The omnidirectional antenna of the present invention can achieve the effect of omnidirectional beam coverage with a single antenna, and has good stability when combined with the PCB circuit board, which increases the overall integration of the module, resulting in a small product size, low cost, and a regular product shape, which is convenient for installation. In addition, since the present invention transmits electromagnetic waves through a hollow waveguide transmission path, the selection of the PCB circuit board material does not need to consider the high-frequency characteristics of the antenna, and a conventional PCB circuit board material can be used, which will further reduce the product cost and make the module more economical and practical. Finally, the directional pattern of the omnidirectional antenna of the present invention has strong adjustability and can be customized and adjusted according to the requirements of the application scenario, and has strong market applicability. Therefore, the present invention effectively overcomes the various shortcomings of the existing technology and has high industrial utilization value.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. An omnidirectional antenna based on a waveguide structure, characterized in that: The omnidirectional antenna includes: a first metal block, a second metal block and a PCB circuit board; wherein, The first metal block and the second metal block are respectively fixed on the metal layers on two opposite sides of the PCB circuit board; The first metal block and the second metal block are respectively provided with at least one hollow channel on a side close to the PCB circuit board, and the hollow channel forms a hollow waveguide transmission path after being bonded to the PCB circuit board; At least one metallized via is provided on the PCB circuit board, and each of the metallized vias is connected to the upper and lower adjacent hollow channels, and the metallized via can transmit the electromagnetic wave transmitted by the upstream hollow waveguide transmission path to the downstream hollow waveguide transmission path; At least one radiation slot is respectively provided on a side of the first metal block and a side of the second metal block away from the PCB circuit board.

2. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: The radiation slot is arranged at a crest of a standing wave formed when electromagnetic waves are transmitted in the hollow waveguide transmission path.

3. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: The first metal block is fixed to the PCB circuit board by screws or welding, and the second metal block is fixed to the PCB circuit board by screws or welding.

4. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: The hollow waveguide transmission path transmits TE 10 Mode of electromagnetic waves.

5. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: A plurality of the radiation slots are provided on the first metal block, and all of the radiation slots are arranged in an array; a plurality of the radiation slots are provided on the second metal block, and all of the radiation slots are arranged in an array.

6. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: The metallized via is configured as a waveguide hole to transmit electromagnetic waves by waveguide transmission; or the metallized via is configured as a coupled radiation hole to transmit electromagnetic waves by coupled transmission.

7. The omnidirectional antenna based on a waveguide structure according to claim 1, characterized in that: A longitudinal waveguide metal block is added to the hollow waveguide transmission path passing through the PCB circuit board to extend the length of the hollow waveguide transmission path.

8. A radio frequency module, characterized in that: The RF module includes: an omnidirectional antenna based on a waveguide structure and a chip package as described in any one of claims 1 to 7; wherein the chip package is electrically connected to the PCB circuit board of the omnidirectional antenna based on a waveguide structure to transmit the RF signal to the hollow waveguide transmission path of the omnidirectional antenna based on a waveguide structure.

9. The radio frequency module according to claim 8, wherein: The chip package is an LoP chip, which has a radiation port. The radiation port transmits the radio frequency signal directly to the hollow waveguide transmission path through a waveguide transmission hole correspondingly arranged on the PCB circuit board; or the radio frequency signal fed out of the chip package is sequentially transmitted to the hollow waveguide transmission path through the chip package pins and transmission lines and through the mode conversion structure.

10. The radio frequency module according to claim 8, wherein: The radio frequency module is suitable for use in a radar system or a base station system.

Images