Broadband slot antenna

Abstract

The embodiment of the utility model provides a broadband slot antenna. The broadband slot antenna comprises a first metal layer, a dielectric layer and a second metal layer, the dielectric layer is arranged between the first metal layer and the second metal layer; the first metal layer can be used as a grounding end of the broadband slot antenna; a multimode slot radiator is arranged on the first metal layer; a metal via hole penetrating through the first metal layer, the dielectric layer and the second metal layer is formed in the broadband slot antenna; the second metal layer comprises a first microstrip line, a first L-shaped resonant body and a second L-shaped resonant body, and the first L-shaped resonant body and the second L-shaped resonant body are symmetrical about the first microstrip line; one end of the first L-shaped resonant body is an open circuit, and the other end of the first L-shaped resonant body is a short circuit; one end of the second L-shaped resonant body is an open circuit, and the other end of the second L-shaped resonant body is a short circuit. Compared with a traditional broadband slot antenna, the broadband slot antenna has the in-band controllable notch characteristic and also has the characteristics of high gain and high radiation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of planar antennas, in particular to a broadband slot antenna with controllable notch characteristics. Background Art

[0002] At present, the application of wireless communication terminals is becoming more and more extensive, which has led to the rapid development of wireless communication technology. Antennas, as the bridge and air interface of wireless communication technology, are bound to be the focus of research.

[0003] Because traditional planar broadband slot antennas have the advantages of low profile, small size, light weight, simple design, high data transmission rate, and easy integration with other components, they have received widespread attention and in-depth research from scholars and engineers in the industry.

[0004] In the existing technology, traditional broadband slot antennas still have some defects: traditional broadband slot antennas do not have the function of controllable in-band notch and cannot effectively suppress in-band noise, which greatly limits the use of traditional broadband slot antennas in wireless communication terminals. Utility Model Content

[0005] The broadband slot antenna provided by the present invention aims to solve at least some of the defects of existing broadband slot antennas.

[0006] The utility model provides a broadband slot antenna. The broadband slot antenna comprises:

[0007] a first metal layer, a dielectric layer, and a second metal layer; the dielectric layer is disposed between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer;

[0008] The first metal layer can serve as the ground terminal of the broadband slot antenna; a multimode slot radiator is provided on the first metal layer;

[0009] The broadband slot antenna is provided with a metal via penetrating the first metal layer, the dielectric layer, and the second metal layer, and the metal via is used to conduct electricity between the first metal layer and the second metal layer;

[0010] The second metal layer includes: a first microstrip line, a first L-shaped resonator and a second L-shaped resonator, and the first L-shaped resonator and the second L-shaped resonator are symmetrical about the first microstrip line;

[0011] One end of the first L-shaped resonator is open-circuited, and the other end of the first L-shaped resonator is short-circuited; one end of the second L-shaped resonator is open-circuited, and the other end of the second L-shaped resonator is short-circuited.

[0012] In some embodiments, the multi-mode slot radiator is disposed at a central position of the first metal layer.

[0013] In some embodiments, the first metal layer is rectangular in shape;

[0014] The first metal layer has a preset first size in a first direction, and the first metal layer has a preset second size in a second direction;

[0015] The first direction is the length direction of the rectangle, and the second direction is the width direction of the rectangle.

[0016] In some embodiments, the first L-shaped resonator comprises:

[0017] a first short-circuit patch and a second microstrip line extending along the second direction;

[0018] The second microstrip line has a first end and a second end which are opposite to each other in the second direction;

[0019] The first short-circuit patch is arranged at the first end to form a short circuit; the second end forms an open circuit.

[0020] In some embodiments, the second L-shaped resonator comprises:

[0021] a second short-circuit patch and a third microstrip line extending along the second direction;

[0022] The third microstrip line has a third end and a fourth end which are away from each other in the second direction;

[0023] Wherein, the second short-circuit patch is arranged at the third end to form a short circuit; the fourth end forms an open circuit;

[0024] The second microstrip line has a preset third size in the second direction, the third microstrip line has a preset fourth size in the second direction, and the third size is equal to the fourth size.

[0025] In some embodiments, the multimode slot radiator comprises:

[0026] a horizontal slot radiation portion, a pair of first vertical slot radiation portions, and a pair of second vertical slot radiation portions;

[0027] The horizontal slot radiation portion extends along the first direction and has a first side and a second side facing away from each other in the second direction;

[0028] A pair of the first vertical slot radiation portions are vertically disposed on a first side of the horizontal slot radiation portion, and a pair of the second vertical slot radiation portions are vertically disposed on a second side of the horizontal slot radiation portion.

[0029] In some embodiments, the horizontal slot radiation portion has a fifth end and a sixth end that are away from each other in the first direction;

[0030] One of the first vertical slot radiating portions of the multi-mode slot radiator is close to the fifth end and has a first preset distance from the fifth end;

[0031] Another first vertical slot radiating portion of the multi-mode slot radiator is close to the sixth end and has a second preset distance from the sixth end;

[0032] Wherein, the first preset distance and the second preset distance are equal.

[0033] In some embodiments, one of the second vertical slot radiating portions of the multi-mode slot radiator is close to the fifth end and has a first preset distance from the fifth end;

[0034] Another second vertical slot radiating portion of the multi-mode slot radiator is close to the sixth end and has a second preset distance between the second vertical slot radiating portion and the sixth end;

[0035] The first preset distance is equal to the second preset distance; and the first preset distance is smaller than the first preset distance.

[0036] In some embodiments, the horizontal slot radiation portion has a first slot width in the second direction, the first vertical slot radiation portion has a second slot width in the first direction, and the second vertical slot radiation portion has a third slot width in the first direction;

[0037] The first gap width, the second gap width, and the third gap width are all equal.

[0038] In some embodiments, the first vertical slot radiation portion has a first slot length in the second direction, the second vertical slot radiation portion has a second slot length in the second direction, and the horizontal slot radiation portion has a third slot length in the first direction;

[0039] The first gap length is smaller than the second gap length, and the second gap length is smaller than the third gap length.

[0040] In some embodiments, the center frequency of the broadband slot antenna is inversely proportional to the third dimension of the second microstrip line, or inversely proportional to the fourth dimension of the third microstrip line;

[0041] The inverse proportional relationship means that the center frequency may decrease as the third size or the fourth size increases.

[0042] At least one beneficial effect of the broadband slot antenna provided by the embodiment of the present invention is: by adding a structure of a first L-shaped resonator and a second L-shaped resonator that are symmetrical about the first microstrip line, the broadband slot antenna not only has the advantage of a controllable in-band notch feature compared to a traditional broadband slot antenna, but also has the characteristics of high gain and high radiation efficiency, and the notch has a higher isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0044] Figure 1 Schematic diagram of the structure of the broadband slot antenna provided by an embodiment of the present utility model;

[0045] Figure 2 Schematic diagram of the structure of the first metal layer provided by an embodiment of the present utility model;

[0046] Figure 3 Schematic diagram of the structure of the second metal layer provided by an embodiment of the present utility model;

[0047] Figure 4 is a perspective view of a broadband slot antenna provided by an embodiment of the present invention, showing a first metal layer, a second metal layer, a multi-mode slot radiator, a first L-shaped resonator, a second L-shaped resonator, and a metal via;

[0048] Figure 5 is a schematic diagram of the first metal layer provided in an embodiment of the present utility model;

[0049] Figure 6 is a schematic diagram of the second metal layer provided in an embodiment of the present utility model;

[0050] Figure 7 is a schematic diagram of a second L-shaped resonator provided in an embodiment of the present utility model;

[0051] Figure 8 Schematic diagram of the change between the standing wave ratio of the broadband slot antenna and the third dimension of the second microstrip line provided by an embodiment of the present utility model;

[0052] Figure 9 Schematic diagram of the change between the standing wave ratio of the broadband slot antenna and the physical width of the second microstrip line provided by an embodiment of the present utility model;

[0053] Figure 10 Schematic diagram showing the change between the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model and the physical distance between the second microstrip line and the first microstrip line;

[0054] Figure 11 Schematic diagram showing a change in the standing wave ratio of the broadband slot antenna provided by an embodiment of the present invention and a physical distance between the third end of the third microstrip line and the end of the first microstrip line farther from the metal via in the second direction;

[0055] Figure 12 This is a simulation result diagram of the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model;

[0056] Figure 13 This is a simulation result diagram of the maximum gain and radiation efficiency of the broadband slot antenna provided by an embodiment of the present utility model.

[0057] Figure numerals: 100, broadband slot antenna; 1001, first direction; 1002, second direction; 1003, metal via; 1, first metal layer; 101, multimode slot radiator; 102, ground terminal; 1011, horizontal slot radiating portion; 1012, first vertical slot radiating portion; 1013, second vertical slot radiating portion; 1014, fifth end; 1015, sixth end; 2, dielectric layer; 3, second metal layer; 311, first microstrip line; 312, first L-type resonator; 313, second L-type resonator; 3121, second microstrip line; 3122, first short-circuit patch; 3123, first end; 3124, second end; 3131, third microstrip line; 3132, second short-circuit patch; 3133, third end; 3144, fourth end. DETAILED DESCRIPTION

[0058] The present invention is described in detail below with reference to specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0059] It should be noted that, unless otherwise expressly specified and limited, the terms "vertical", "parallel", "length direction", "width direction", "departing from each other", "close", "far away", "first direction", "second direction" and the like used in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Terms such as "install", "connect", "connect", and "fix" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium. In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features; thus, the features specified as "first", "second", "third", "fourth", "fifth", and "sixth" may explicitly or implicitly include one or more of such features; "multiple" or "several" means two or more; and "and / or" includes any and all combinations of one or more related listed items. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0060] Figure 1 It is a structural diagram of a broadband slot antenna provided by an embodiment of the present utility model. Figure 2 It is a structural schematic diagram of the first metal layer provided in an embodiment of the present utility model. Figure 3 It is a schematic structural diagram of the second metal layer provided in an embodiment of the present utility model. Figure 4 It is a perspective view of a broadband slot antenna provided by an embodiment of the present invention, showing a first metal layer, a second metal layer, a multi-mode slot radiator, a first L-shaped resonator, a second L-shaped resonator, and a metal via.

[0061] See also Figures 1-4 The broadband slot antenna 100 includes: a first metal layer 1, a dielectric layer 2 and a second metal layer 3.

[0062] It can be understood that the dielectric layer 2 is disposed between the first metal layer 1 and the second metal layer 3 to limit direct contact between the first metal layer 1 and the second metal layer 3 .

[0063] Specifically, the dielectric layer 2 can not only achieve antenna isolation, enhanced radiation and impedance matching, but also provide mechanical support, thereby effectively ensuring the normal operation and performance of the broadband slot antenna 100; wherein, the dielectric layer 2, as an isolation layer, can form a certain degree of isolation protection between the first metal layer 1 and the second metal layer 3, preventing the first metal layer 1 and the second metal layer 3 from directly contacting each other and causing a short circuit, thereby effectively ensuring the normal operation of the broadband slot antenna 100; in addition, the dielectric layer 2 can enhance the radiation effect of the broadband slot antenna 100 by changing the distribution and propagation characteristics of the electromagnetic field, thereby improving the performance and operating frequency band of the broadband slot antenna 100; moreover, the selection and design of the dielectric layer 2 can adjust the impedance of the broadband slot antenna 100, which can effectively reduce the reflection loss of the signal, thereby improving the transmission efficiency of the antenna; finally, the dielectric layer 2 can also provide mechanical support. Since the dielectric layer 2 is disposed between the first metal layer 1 and the second metal layer 3, the dielectric layer 2 can enhance the structural strength of the broadband slot antenna 100 to ensure the stability and reliability of the broadband slot antenna 100.

[0064] It should be noted that the first metal layer 1 can serve as the ground terminal 102 (or metal ground) of the broadband slot antenna 100 ; a multimode slot radiator 101 is provided on the first metal layer 1 .

[0065] Specifically, the multi-mode slot radiator 101 serves as a radiating element of the broadband slot antenna 100 and can achieve signal radiation through slot radiation coupling.

[0066] In the embodiment of the present application, a metal via 1003 is provided on the broadband slot antenna 100 , which passes through the first metal layer 1 , the dielectric layer 2 , and the second metal layer 3 . The metal via 1003 is used to conduct electricity between the first metal layer 1 and the second metal layer 3 .

[0067] Specifically, the second metal layer 3 includes a first microstrip line 311 , a first L-shaped resonator 312 and a second L-shaped resonator 313 , and the first L-shaped resonator 312 and the second L-shaped resonator 313 are symmetrical with respect to the first microstrip line 311 .

[0068] Specifically, one end of the first L-shaped resonator 312 is open, and the other end of the first L-shaped resonator 312 is short; one end of the second L-shaped resonator 313 is open, and the other end of the second L-shaped resonator 313 is short.

[0069] In some embodiments, as Figure 2-Figure 4 As shown, the multi-mode slot radiator 101 is arranged at the center of the first metal layer 1 .

[0070] In some embodiments, the shape of the first metal layer 1 is rectangular; wherein the shape of the first metal layer 1 can be rectangular, circular, elliptical, etc.; the radiation performance and bandwidth of the broadband slot antenna 100 are determined by the ground terminal 102 (or called metal ground) and the multi-mode slot radiator 101; in addition, the center frequency of the notch of the broadband slot antenna 100 is determined by the parameters of the second microstrip line 3121 of the first L-shaped resonator 312 and the parameters of the third microstrip line 3131 of the second L-shaped resonator 313; in addition, the characteristic impedances of the second microstrip line 3121 and the third microstrip line 3131 are both greater than the characteristic impedance of the first microstrip line 311 (in this application, the characteristic impedance of the first microstrip line 311 can be 50Ω).

[0071] Specifically, notch filtering refers to a frequency-selective filtering technology used to suppress or weaken signal transmission within a specific frequency band. Notch filtering is usually achieved by introducing one or more resonant circuits in a wireless communication system. These resonant circuits generate high impedance at a specific frequency, thereby preventing or reducing the transmission of signals near that frequency.

[0072] It is understandable that the main functions of notching include: suppressing interference signals, avoiding frequency conflicts, improving the performance of wireless communication systems, and adapting to complex environments.

[0073] In wireless communication systems, broadband slot antennas may receive interference signals from other frequency bands or systems. By introducing a notch design into the broadband slot antenna, these interference signals can be effectively suppressed, thereby improving the anti-interference capability of the wireless communication system.

[0074] In addition, in wireless communication systems, the operating frequency band of the broadband slot antenna may overlap with the frequency band of other communication systems, resulting in frequency conflicts. By setting a notch in the broadband slot antenna, it is possible to avoid transmitting signals within a specific frequency band, thereby avoiding frequency conflicts with other systems.

[0075] In addition, notching can optimize the frequency response of an antenna, enabling better performance within a specific frequency band. For example, in a receiving system, by eliminating or attenuating unwanted signals, the receiver's signal-to-noise ratio (SNR) can be improved, thereby enhancing the overall performance of the wireless communication system.

[0076] Moreover, in a complex electromagnetic environment, the broadband slot antenna may be subject to interference from multiple directions. By setting multiple notches in the broadband slot antenna, different interference sources can be suppressed, thereby improving the adaptability of the broadband slot antenna in complex environments.

[0077] It should be noted that controllable notch is a specific design technology that aims to form a stopband within a specific frequency band by adjusting or controlling certain parameters of the antenna, that is, to suppress or weaken the signal transmission within the frequency band. Controllable notch technology is usually used to avoid frequency conflicts with narrowband communication systems and can effectively improve the performance of broadband slot antennas.

[0078] The first metal layer 1 has a preset first size LG in the first direction 1001 , and the first metal layer 1 has a preset second size WG in the second direction 1002 .

[0079] In addition, the first direction 1001 is the length direction of the rectangle, and the second direction 1002 is the width direction of the rectangle.

[0080] Figure 5 It is a schematic layout of the first metal layer provided in an embodiment of the present utility model. Figure 6 It is a schematic layout of the second metal layer provided in an embodiment of the present utility model. Figure 7 It is a schematic diagram of the second L-shaped resonator provided in an embodiment of the present utility model.

[0081] In some embodiments, combined Figure 3-Figure 7 It can be seen that the first L-shaped resonator 312 includes a first short-circuit patch 3122 and a second microstrip line 3121 extending along the second direction 1002 .

[0082] It can be understood that the second microstrip line 3121 has a first end 3123 and a second end 3124 that are opposite to each other in the second direction 1002 .

[0083] It should be noted that the first short-circuit patch 3122 is provided at the first end 3123 to form a short circuit; and the second end 3124 forms an open circuit.

[0084] In some embodiments, according to Figure 3-Figure 6 It can be seen that the second L-shaped resonator 313 includes a second short-circuit patch 3132 and a third microstrip line 3131 extending along the second direction 1002 .

[0085] Specifically, the third microstrip line 3131 has a third end 3133 and a fourth end 3144 that are opposite to each other in the second direction 1002 .

[0086] To further illustrate, the second short-circuit patch 3132 is disposed at the third end 3133 to form a short circuit; and the fourth end 3144 forms an open circuit.

[0087] Specifically, the second microstrip line 3121 has a preset third dimension in the second direction 1002 , the third microstrip line 3131 has a preset fourth dimension in the second direction 1002 , and the third dimension is equal to the fourth dimension.

[0088] It should be noted that the dimension parameter L1 represents the length dimension of the second microstrip line 3121 and the third microstrip line 3131 (the length dimension includes the third dimension and the fourth dimension).

[0089] In some embodiments, Figures 1-4 It can be seen that the multi-mode slot radiator 101 includes: a horizontal slot radiating portion 1011 , a pair of first vertical slot radiating portions 1012 and a pair of second vertical slot radiating portions 1013 .

[0090] The horizontal slot radiation portion 1011 extends along a first direction 1001 and has a first side and a second side that are opposite to each other in a second direction 1002 .

[0091] In addition, a pair of first vertical slot radiation portions 1012 are vertically disposed on a first side of the horizontal slot radiation portion 1011 , and a pair of second vertical slot radiation portions 1013 are vertically disposed on a second side of the horizontal slot radiation portion 1011 .

[0092] In some embodiments, please refer to Figure 1-Figure 7 The horizontal slot radiation portion 1011 has a fifth end 1014 and a sixth end 1015 that are opposite to each other in the first direction 1001 .

[0093] It can be understood that one of the first vertical slot radiating portions 1012 of the multi-mode slot radiator 101 is close to the fifth end 1014 and has a first preset distance from the fifth end 1014 .

[0094] It should be noted that another first vertical slot radiating portion 1012 of the multi-mode slot radiator 101 is close to the sixth end 1015 and has a second preset distance from the sixth end 1015 .

[0095] Specifically, the first preset distance and the second preset distance are equal.

[0096] It can be understood that the size parameter DS2 represents a preset distance between the first vertical slot radiation portion 1012 and the end of the horizontal slot radiation portion 1011 (the preset distance includes a first preset distance and a second preset distance).

[0097] In some embodiments, please refer to Figure 1-Figure 7 One of the second vertical slot radiating portions 1013 of the multi-mode slot radiator 101 is close to the fifth end 1014 and has a first preset distance between it and the fifth end 1014 .

[0098] Another second vertical slot radiating portion 1013 of the multi-mode slot radiator 101 is close to the sixth end 1015 and has a second preset distance from the sixth end 1015 .

[0099] In addition, the first preset distance is equal to the second preset distance; and the first preset distance is smaller than the first preset distance.

[0100] Specifically, the size parameter DS3 represents a preset distance between the second vertical slot radiation portion 1013 and the end of the horizontal slot radiation portion 1011 (the preset distance includes a first preset distance and a second preset distance).

[0101] In some embodiments, combined Figure 1-Figure 7 It can be seen that the horizontal slot radiating portion 1011 has a first slot width in the second direction 1002 , the first vertical slot radiating portion 1012 has a second slot width in the first direction 1001 , and the second vertical slot radiating portion 1013 has a third slot width in the first direction.

[0102] The first gap width, the second gap width and the third gap width are all equal.

[0103] In addition, the size parameter WS represents the slot width of the multi-mode slot radiator 101 (the slot width includes a first slot width, a second slot width, and a third slot width).

[0104] In some embodiments, the first vertical slot radiating portion 1012 has a first slot length LS2 in the second direction 1002 , the second vertical slot radiating portion 1013 has a second slot length LS1 in the second direction 1002 , and the horizontal slot radiating portion 1011 has a third slot length in the first direction 1001 .

[0105] Specifically, a pair of second vertical slot radiation portions 1013 have a third preset spacing DS1 in the second direction 1002; in addition, the above-mentioned third slot length is equal to the sum of the first preset spacing, the second preset spacing, the third preset spacing and the two third slot widths (that is, the above-mentioned third slot length = 2×DS3+DS1+2×WS).

[0106] Moreover, the first gap length LS2 is smaller than the second gap length LS1 , and the second gap length LS1 is smaller than the third gap length.

[0107] In some embodiments, as Figure 1-Figure 7 As shown, the center frequency fn of the broadband slot antenna 100 and the third dimension of the second microstrip line 3121 are inversely proportional.

[0108] Among them, the inverse relationship is the center frequency f n may decrease as the third dimension increases.

[0109] It should be noted that the center frequency f The calculation formula for n is: in, (εr is the dielectric constant of the dielectric layer 2), c is a certain constant, and L1 is the third dimension.

[0110] In order to facilitate readers to understand the concept of the present invention, a simulation experiment can be performed on the actual broadband slot antenna 100.

[0111] In this simulation experiment, the dielectric constant εr of the dielectric layer 2 is 3.38, the dielectric loss of the dielectric layer 2 is 0.0022, and the thickness of the dielectric layer 2 is 0.762 mm; the first metal layer 1 and the second metal layer 3 are both copper-plated, and the thickness of the first metal layer 1 and the second metal layer 3 are both 0.035 mm; the size specifications of the first metal layer 1 are: the first dimension LG is 142 mm, and the second dimension WG is 92 mm.

[0112] Figure 8 It is a schematic diagram of the change between the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model and the third dimension of the second microstrip line.

[0113] Figure 8 The simulation results are mainly shown when the third dimension L1 of the second microstrip line 3121 (or the fourth dimension L1 of the third microstrip line 3131) is 15.0 mm, 16.0 mm and 17.0 mm respectively, which can show the influence of the third dimension (or fourth dimension) L1 on the frequency and standing wave ratio of the notch of the broadband slot antenna 100.

[0114] Combine Figures 1-8 It can be seen that as the third dimension L1 of the second microstrip line 3121 (or the fourth dimension L2 of the third microstrip line 3131) increases, the center frequency of the notch of the broadband slot antenna 100 increases. f n is shifted downward, and the center frequency f The standing wave ratio at n is almost unchanged, and the bandwidth is also basically unchanged.

[0115] Figure 9 It is a schematic diagram of the change between the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model and the physical width of the second microstrip line.

[0116] Figure 9 It mainly shows the simulation results when the physical width W1 of the second microstrip line 3121 (or the physical width of the third microstrip line 3131) is 0.1 mm, 0.2 mm and 0.3 mm respectively, which can show the influence of the physical width W1 of the second microstrip line 3121 (or the physical width of the third microstrip line 3131) on the frequency and standing wave ratio of the notch of the broadband slot antenna 100.

[0117] Reference Figure 1-Figure 7 as well as Figure 9It can be seen that as the physical width W1 of the second microstrip line 3121 (or the physical width of the third microstrip line 3131) increases, the center frequency of the notch of the broadband slot antenna 100 increases. f n is shifted downward, and the center frequency f The standing wave ratio at n becomes larger, and the bandwidth remains basically unchanged.

[0118] Figure 10 This is a schematic diagram of the change between the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model and the physical distance between the second microstrip line and the first microstrip line.

[0119] Figure 10 It mainly shows the simulation results when the physical distance D1 between the second microstrip line 3121 and the first microstrip line 311 (or the physical distance D1 between the third microstrip line 3131 and the first microstrip line 311) is 0.6 mm, 0.8 mm and 1.0 mm respectively, which can show the influence of the physical distance D1 between the second microstrip line 3121 and the first microstrip line 311 (or the physical distance D1 between the third microstrip line 3131 and the first microstrip line 311) on the frequency and standing wave ratio of the notch of the broadband slot antenna 100.

[0120] according to Figure 1-Figure 7 as well as Figure 10 It can be seen that as the physical distance D1 between the second microstrip line 3121 and the first microstrip line 311 (or the physical distance D1 between the third microstrip line 3131 and the first microstrip line 311) increases, the passband bandwidth of the broadband slot antenna 100 increases, the passband matching becomes better, and the center frequency of the notch of the broadband slot antenna 100 becomes larger. f n is slightly shifted downward, and the center frequency of the notch of the broadband slot antenna 100 is f The standing wave ratio at n becomes smaller.

[0121] Figure 11 It is a schematic diagram of the change between the standing wave ratio of the broadband slot antenna provided by an embodiment of the present invention and the physical distance between the third end of the third microstrip line and the end of the first microstrip line away from the metal via in the second direction.

[0122] Figure 11The figure mainly shows the simulation results when the physical distance D2 between the first end 3123 of the second microstrip line 3121 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002 (or the physical distance D2 between the third end 3133 of the third microstrip line 3131 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002) is 5.0 mm, 10.0 mm and 15.0 mm respectively. It can be seen that the physical distance D2 between the first end 3123 of the second microstrip line 3121 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002 (or the physical distance D2 between the third end 3133 of the third microstrip line 3131 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002) affects the frequency and standing wave ratio of the notched wave of the broadband slot antenna 100.

[0123] Depend on Figure 1-Figure 7 as well as Figure 11 It can be seen that as the physical distance D2 between the first end 3123 of the second microstrip line 3121 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002 (or the physical distance D2 between the third end 3133 of the third microstrip line 3131 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002) increases, the passband center frequency of the broadband slot antenna 100 shifts upward, while the absolute bandwidth of the passband remains basically unchanged, and the notch center frequency shifts slightly upward, and the standing wave ratio at the notch center frequency fn of the broadband slot antenna 100 becomes slightly smaller.

[0124] Combine Figures 8-11 It can be seen that the frequency and center frequency of the notch can be controlled independently by controlling the relevant parameters of the first L-shaped resonator 312 (or the second L-shaped resonator 313). f The standing wave ratio at n.

[0125] After optimization, a set of design parameters of the instance can be obtained; combined with Figure 5-Figure 7 The optimized dimensional parameters are: LG=142mm; WG=92mm; LS1=16.5mm; LS2=15.4mm; DS1=34.2mm; DS2=16.0mm; DS3=20.2mm; WS=3.8mm; LF=50mm; WF=1.8mm; L1=15.5mm; W1=0.1mm; D1=0.8mm; D2=10.2mm; ΦV=1.3mm.

[0126] Wherein, LG is the physical length of the first metal layer 1 (i.e., the first size); WG is the physical width of the first metal layer 1 (i.e., the second size); LS1 is the physical length of the second vertical slot radiating portion 1013 (i.e., the second slot length); LS2 is the physical length of the first vertical slot radiating portion 1012 (i.e., the first slot length); DS1 is the physical spacing between a pair of second vertical slot radiating portions 1013 (i.e., the third preset spacing); DS2 is the physical distance between the first vertical slot radiating portion 1012 and the end of the horizontal slot radiating portion 1011 (i.e., the first preset distance or the second preset distance); DS3 is the physical gap between the second vertical slot radiating portion 1013 and the end of the horizontal slot radiating portion 1011 (i.e., the first preset spacing or the second preset spacing); WS is the slot width of the multimode slot radiator 101 (i.e., the first slot width, the second slot width and the third slot width); LF is the first microstrip WF is the physical width of the first microstrip line 311; L1 is the physical length of the second microstrip line 3121 (or, the physical length of the third microstrip line 3131; that is, the third size or the fourth size); W1 is the physical width of the second microstrip line 3121 (or, the physical width of the third microstrip line 3131); D1 is the physical distance between the second microstrip line 3121 and the first microstrip line 311 (or, the physical distance between the third microstrip line 3131 and the first microstrip line 3131); D2 is the physical distance between the first end 3123 of the second microstrip line 3121 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002 (or, the physical distance between the third end 3133 of the third microstrip line 3131 and the end of the first microstrip line 311 away from the metal via 1003 in the second direction 1002); ΦV is the physical diameter of the metal via 1003 (ΦV is not marked in the figure).

[0127] The broadband slot antenna has two transmission poles and one transmission zero. The frequencies corresponding to the two transmission poles are named fp1 and fp2 from low to high, and the relationship between the frequencies corresponding to the two transmission poles and related parameters is as follows:

[0128]

[0129]

[0130] in, (εr is the dielectric constant of the dielectric layer 2), and c is a certain constant.

[0131] Figure 12 This is a simulation result diagram of the standing wave ratio of the broadband slot antenna provided by an embodiment of the present utility model.

[0132] The simulation results of the standing wave ratio of the broadband slot antenna 100 after the parameters are optimized are as follows: Figure 12 As shown. Figure 12 It is easy to see that the broadband slot antenna 100 has an in-band notch characteristic, and the passband bandwidth with a standing wave ratio of less than 2 ranges from 2.44 GHz to 3.52 GHz, the center frequency of the passband is 2.98 GHz, the absolute bandwidth of the broadband slot antenna 100 is 1.08 GHz, and the relative bandwidth of the broadband slot antenna 100 is 36.2%, showing broadband characteristics; in addition, there are two transmission poles in the passband, located at 2.77 GHz and 3.41 GHz, respectively, to ensure the flatness of the maximum gain in the passband; and there is also a notch in the passband, the center frequency fn of the notch is 3.09 GHz, and the center frequency fn of the notch is 3.09 GHz. f The standing wave ratio at n is 9.3, which can ensure the center frequency of the notch f Maximum isolation at n.

[0133] Figure 13 This is a simulation result diagram of the maximum gain and radiation efficiency of the broadband slot antenna provided by an embodiment of the present utility model.

[0134] Depend on Figure 13 It can be seen that the broadband slot antenna 100 not only has high gain and high radiation efficiency, but also has a notch with high isolation; and at the center frequency fn of the notch of the broadband slot antenna 100 , its isolation can be as high as 13 dB.

[0135] In summary, the broadband slot antenna provided by the embodiment of the present invention, by incorporating a first L-shaped resonator and a second L-shaped resonator structure that are symmetrical about a first microstrip line, not only has the advantages of a controllable in-band notch compared to conventional broadband slot antennas, but also has the characteristics of high gain and high radiation efficiency, and the notch has high isolation. Therefore, the broadband slot antenna provided by the embodiment of the present invention has certain novelties compared to conventional broadband slot antennas.

[0136] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention cannot be limited to these descriptions. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the concept of the present invention, and all of these modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A broadband slot antenna, characterized in that: include: a first metal layer, a dielectric layer, and a second metal layer; The dielectric layer is disposed between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer; The first metal layer can serve as the ground terminal of the broadband slot antenna; a multimode slot radiator is provided on the first metal layer; The broadband slot antenna is provided with a metal via penetrating the first metal layer, the dielectric layer, and the second metal layer, and the metal via is used to conduct electricity between the first metal layer and the second metal layer; The second metal layer includes: a first microstrip line, a first L-shaped resonator and a second L-shaped resonator, and the first L-shaped resonator and the second L-shaped resonator are symmetrical about the first microstrip line; One end of the first L-shaped resonator is open-circuited, and the other end of the first L-shaped resonator is short-circuited; one end of the second L-shaped resonator is open-circuited, and the other end of the second L-shaped resonator is short-circuited.

2. The broadband slot antenna according to claim 1, wherein The multi-mode slot radiator is arranged at the center of the first metal layer.

3. The broadband slot antenna according to claim 1, wherein: The first metal layer is in a rectangular shape; The first metal layer has a preset first size in a first direction, and the first metal layer has a preset second size in a second direction; The first direction is the length direction of the rectangle, and the second direction is the width direction of the rectangle.

4. The broadband slot antenna according to claim 3, wherein: The first L-shaped resonator includes: a first short-circuit patch and a second microstrip line extending along the second direction; The second microstrip line has a first end and a second end which are opposite to each other in the second direction; The first short-circuit patch is arranged at the first end to form a short circuit; the second end forms an open circuit.

5. The broadband slot antenna according to claim 4, wherein: The second L-shaped resonator includes: a second short-circuit patch and a third microstrip line extending along the second direction; The third microstrip line has a third end and a fourth end which are away from each other in the second direction; Wherein, the second short-circuit patch is arranged at the third end to form a short circuit; the fourth end forms an open circuit; The second microstrip line has a preset third size in the second direction, the third microstrip line has a preset fourth size in the second direction, and the third size is equal to the fourth size.

6. The broadband slot antenna according to claim 3, wherein: The multimode slot radiator comprises: a horizontal slot radiation portion, a pair of first vertical slot radiation portions, and a pair of second vertical slot radiation portions; The horizontal slot radiation portion extends along the first direction and has a first side and a second side facing away from each other in the second direction; A pair of the first vertical slot radiation portions are vertically disposed on a first side of the horizontal slot radiation portion, and a pair of the second vertical slot radiation portions are vertically disposed on a second side of the horizontal slot radiation portion.

7. The broadband slot antenna according to claim 6, wherein: The horizontal slot radiation portion has a fifth end and a sixth end that are away from each other in the first direction; One of the first vertical slot radiating portions of the multi-mode slot radiator is close to the fifth end and has a first preset distance from the fifth end; Another first vertical slot radiating portion of the multi-mode slot radiator is close to the sixth end and has a second preset distance from the sixth end; Wherein, the first preset distance and the second preset distance are equal.

8. The broadband slot antenna according to claim 7, wherein: One of the second vertical slot radiating portions of the multi-mode slot radiator is close to the fifth end and has a first preset distance between the second vertical slot radiating portion and the fifth end; Another second vertical slot radiating portion of the multi-mode slot radiator is close to the sixth end and has a second preset distance between the second vertical slot radiating portion and the sixth end; Wherein, the first preset distance and the second preset distance are equal; The first preset distance is smaller than the first preset spacing.

9. The broadband slot antenna according to claim 6, wherein: The horizontal slot radiation portion has a first slot width in the second direction, the first vertical slot radiation portion has a second slot width in the first direction, and the second vertical slot radiation portion has a third slot width in the first direction; The first gap width, the second gap width, and the third gap width are all equal.

10. The broadband slot antenna according to claim 6, wherein: The first vertical slot radiation portion has a first slot length in the second direction, the second vertical slot radiation portion has a second slot length in the second direction, and the horizontal slot radiation portion has a third slot length in the first direction; The first gap length is smaller than the second gap length, and the second gap length is smaller than the third gap length.

11. The broadband slot antenna according to claim 5, wherein: The center frequency of the broadband slot antenna is inversely proportional to the third dimension of the second microstrip line, or inversely proportional to the fourth dimension of the third microstrip line; The inverse proportional relationship means that the center frequency may decrease as the third size or the fourth size increases.

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