Flexible bendable ultra-wideband printed antenna with triple notch characteristic

Abstract

The application discloses a flexible bendable ultra-wideband printed antenna with three-trap characteristics, which comprises a flexible dielectric substrate, a radiation patch, a feed line and a ground plate, and the radiation patch, the feed line and the ground plate are located on the same side of the flexible dielectric substrate; the upper end of the radiation patch is provided with a first fan-shaped patch unit, the middle end is provided with a polygonal patch unit, and the lower end is provided with a second fan-shaped patch unit; the feed line is connected with the bottom of the radiation patch and has a rectangular shape; the ground plate is a rectangular structure unit symmetrically distributed on both sides of the feed line, and two fan-shaped cut corners are symmetrically arranged at the top of the side wall of the ground plate close to the feed line. The flexible dielectric substrate is adopted, so that the antenna can be freely bent and conformal to the surface of a complex object. The antenna has the advantages of lightness, thinness, softness, low cost, stability, high performance and the like, and has important practical value in the fields of radio frequency and flexible electronics.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of flexible electronics and antennas, and particularly relates to a flexible bendable ultra-wideband printed antenna with three notch characteristics. BACKGROUND

[0002] With the development of the times, electronic products are transforming towards flexibility and miniaturization, and are rapidly integrated into information, energy, aerospace, military, medical, manufacturing and many other fields. Antennas are indispensable key components for wireless communication equipment to transmit and receive signals. Traditional antennas generally use Rogers, FR4 and other hard substrates, which greatly limit the development of electronic products. In order to solve this problem, flexible antennas have emerged.

[0003] Ultra-wideband (UWB) wireless communication technology has become one of the most potential technologies in the current era due to its high transmission rate, low power consumption, high security, accurate positioning and large system capacity. Therefore, it has extremely important research significance and application value to combine ultra-wideband technology with flexible antenna technology and make flexible bendable ultra-wideband printed antennas.

[0004] Due to the wide range of ultra-wideband frequency bands, covering WiMAX, WLAN and X frequency bands, signal interference is easily caused when communicating in different communication systems, thereby reducing communication quality. To solve this problem, the traditional method is to introduce a band-stop filter into the ultra-wideband system, which not only increases the complexity of the system, but also increases the size of the electronic device, hindering the miniaturization development of electronic devices. The new method is to introduce a notch structure in the antenna design process, directly designing an ultra-wideband antenna with notch function, which not only effectively isolates the interference of part of the frequency band, but also effectively reduces the size of the system, and thus has become a research hotspot.

[0005] Flexible antennas combine communication, materials, chemistry, printing and other technologies, and are developed from current flexible electronics technology. Flexible antennas have excellent bending performance, can conform well with other objects, and can be widely used in smart wear, smart medical care, smart logistics, material inventory and agriculture and animal husbandry. In recent years, many flexible antennas have been proposed, especially RFID tag antennas. However, the research on conventional antennas is not many. Some documents or patents have involved flexible bendable ultra-wideband printed antennas, but the performance after bending is generally poor, or only single-notch or double-notch performance can be achieved, or the size is relatively large. With the development trend of flexible and miniaturized electronic communication equipment, it is of great significance to research flexible bendable ultra-wideband printed antennas with the characteristics of miniaturization, multi-notch and high stability. SUMMARY

[0006] Therefore, the application provides a flexible bendable ultra-wideband printed antenna with three notch characteristics according to flexible printed electronic technology.

[0007] In order to achieve the above-mentioned purpose, the application realizes the above-mentioned purpose by the following technical scheme.

[0008] The application provides a flexible bendable ultra-wideband printed antenna with three notch characteristics, which comprises a flexible dielectric substrate 10, a radiation patch 20, a feed line 30 and a ground plate 40.

[0009] The upper end of the radiation patch 20 is provided with a first fan-shaped patch unit 21, the middle end is provided with a polygonal patch unit 22, and the lower end is provided with a second fan-shaped patch unit 23.

[0010] The feed line 30 is connected to the bottom of the radiation patch 20, and the feed line 30 is in a rectangular shape.

[0011] The ground plate 40 is a rectangular structure unit symmetrically distributed on both sides of the feed line 30, and two fan-shaped cut corners 41 are symmetrically arranged at the top end of the ground plate 40 close to the side wall of the feed line 30. The flexible dielectric substrate of the application adopts a flexible substrate, has a compact structure, small size and thin thickness, is convenient for integration with a radio frequency front-end circuit, and can be conformal with a complex object; the radiation patch of the application is spliced by using an upper fan-shaped structure, a lower fan-shaped structure and a middle polygonal structure, so that the working frequency band of the ultra-wideband and the miniaturization of the antenna are realized; the design of the radiation patch, the feed line and the ground plate adopts a completely symmetrical structure on the left and right sides, so that the loss of the antenna performance during bending is reduced as much as possible.

[0012] Further, the fan-shaped structure radius of the first fan-shaped patch unit 21 at the upper end of the radiation patch 20 is 10.0 mm, the fan-shaped structure radius of the second fan-shaped patch unit 23 at the lower end is 6.5 mm, and the polygonal structure of the polygonal patch unit 22 at the middle end is cut from a regular hexagon with a side length of 5.6 mm.

[0013] Further, the first fan-shaped patch unit 21 is internally provided with a fan ring-shaped groove 24 with an opening downward, the second fan-shaped patch unit 23 is internally provided with a U-shaped groove 26 with an opening upward, the opening of the U-shaped groove 26 extends upward into the polygonal patch unit 22, and the polygonal patch unit 22 is internally provided with a C-shaped groove 25 with an opening downward.

[0014] Optionally, the fan ring-shaped groove, the C-shaped groove and the U-shaped groove are mirror-symmetrically distributed about the vertical central axis of the antenna.

[0015] From the above, the fan ring groove, the U-shaped groove and the C-shaped groove are located on the vertical central axis of the antenna, and are mirror-symmetrically distributed about the vertical central axis, thereby reducing the influence of bending on the performance of the antenna.

[0016] Further, the U-shaped groove 26 is located at the lower edge of the second fan-shaped patch unit 23 at the lower end of the radiation patch 20; the C-shaped groove 25 is located inside the U-shaped groove 26, and the opening thereof faces downward; and the fan ring groove 24 is located at the upper edge of the first fan-shaped patch unit 21 at the upper end of the radiation patch 20, and the opening direction thereof faces downward.

[0017] From the above, the three different shapes and lengths of the groove structures loaded on the three patch units on the radiation patch generate a stopband, filter out three different narrowband signals, eliminate the interference of the three frequency bands, and realize the collaborative communication of the ultra-wideband system and other narrowband communication systems.

[0018] Further, the fan ring groove is obtained by truncating a circular ring with a radius of 4.7-4.9 mm, the total length of the groove is 14.18-15.12 mm, and the groove width is 0.3 mm.

[0019] Further, the C-shaped groove is obtained by truncating a rectangular ring with a length of 9.5-10 mm and a width of 4.5-5.0 mm, the total length of the groove is 23.0-25.0 mm, and the groove width is 0.25 mm.

[0020] Further, the U-shaped groove is obtained by truncating a regular hexagonal ring with a side length of 7.4 mm, the total length of the groove is 29.53-30.43 mm, and the groove width is 0.26 mm.

[0021] From the above, the two fan-shaped structures and the polygonal structure are spliced as the radiation patch, which widens the frequency band range of the antenna on the basis of reducing the size of the antenna; the introduction of the three groove structures makes the antenna generate a stopband characteristic; the three grooves are mirror-symmetrically distributed about the vertical central axis of the antenna, thereby reducing the influence of bending on the performance of the antenna. The antenna structure is simple, the performance is stable, and the antenna is easy to manufacture.

[0022] Further, the characteristic impedance of the feed line is 50Ω, the length of the feed line is 11.6 mm, and the width thereof is 2.3 mm.

[0023] Further, the length of the ground plate 40 located on both sides of the feed line 30 is 13.1 mm, the width thereof is 12.7 mm, and the radius of the fan-shaped cut corner 41 is 8.2 mm.

[0024] From the above, the ground plate structure with the cut corner further improves the overall performance of the antenna.

[0025] Further, the flexible dielectric substrate adopts a polydimethylsiloxane (PDMS) base material, the length of the flexible dielectric substrate is 39.0 mm, the width thereof is 28.0 mm, and the thickness thereof is 0.5 mm.

[0026] The flexible substrate is adopted in the application, the structure is compact, the size is small, the thickness is thin, the integration with the radio frequency front-end circuit is facilitated, meanwhile, the conformal with complex objects can be realized; the overall structure design of the application adopts the completely symmetrical structure from left to right, so as to reduce the loss of the antenna performance as much as possible when bending. The application produces the stop band by loading three different shapes and different lengths of slot structures on the radiation patch, so as to filter out three different narrowband signals, eliminate the interference of three frequency bands, and realize the collaborative communication of the ultra-wideband system and other narrowband communication systems. The application has the advantages of lightness, thinness, miniaturization, stability, good radiation characteristics, etc. The application can be applied to the fields of Internet of Things, Internet of Vehicles, wearable devices, etc., especially the curved object surface, and has excellent radiation and bending performance. BRIEF DESCRIPTION OF DRAWINGS

[0027] The various technical features of the application and the relationship between them will be further illustrated below with reference to the accompanying drawings. The drawings are exemplary, some technical features are not shown in actual proportion, and some technical features in the drawings can be omitted, which are conventional in the technical field to which the application belongs and are not essential for understanding and implementing the application, or additional technical features are shown, which are not essential for understanding and implementing the application, that is, the combination of various technical features shown in the drawings is not used to limit the application. In addition, the same reference signs refer to the same contents throughout the application. The specific drawings are as follows:

[0028] Figure 1 is the overall structure diagram of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application;

[0029] Figure 2 is the radiation patch structure diagram of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application;

[0030] Figure 3 is the return loss curve diagram of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application;

[0031] Fig. 4 is the radiation pattern diagram of different frequency points of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application;

[0032] Figure 5 is the peak gain curve diagram of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application;

[0033] Fig. 6 is the return loss curve diagram of the flexible bendable ultra-wideband printed antenna with three notch characteristics of the application after bending.

[0034] Explanation of reference signs

[0035] 10 - flexible dielectric substrate, 20 - radiating patch, 21 - first sectorial patch element, 22 - polygonal patch element, 23 - second sectorial patch element, 24 - sectoral annular slot, 25 - C-shaped slot, 26 - U-shaped slot, 30 - feed line, 40 - ground plane, 41 - sectorial cut corner.

[0036] The specific embodiments of the application have been shown by way of example in the above figures, and will be described in more detail hereafter. These figures and the written description are not intended to restrict the scope of the inventive concept in any way, but rather to illustrate the inventive concept by reference to specific embodiments. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present application will be described in detail hereafter with reference to the attached drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application can be more clearly defined.

[0038] It should be noted that the terms such as first and second, etc., are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Also, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the elements defined by the phrase "comprise" do not exclude the presence of additional identical elements in the processes, methods, articles or devices including the elements.

[0039] Hereinafter, the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail with specific embodiments. The specific embodiments described below can be combined with each other to form new embodiments. For the same or similar ideas or processes described in one embodiment, they can not be described again in other embodiments. Hereinafter, the embodiments of the present application will be described with reference to the accompanying drawings.

[0040] Figure 1 The overall structure of a flexible bendable ultra-wideband printed antenna with three notch characteristics is shown. As shown in FIG. 1, the antenna includes a flexible dielectric substrate 10, a radiating patch 20, a first sectorial patch element 21, a polygonal patch element 22, a second sectorial patch element 23, a sectoral annular slot 24, a C-shaped slot 25, a U-shaped slot 26, a feed line 30, a ground plane 40, and a sectorial cut corner 41. Figure 1As shown, the flexible bendable ultra-wideband printed antenna with three-trap characteristics of the present application comprises a flexible dielectric substrate 10, a radiation patch 20, a feed line 30, and a ground plate 40, wherein the flexible dielectric substrate 10 adopts a polydimethylsiloxane (PDMS) base material, the radiation patch 20, the feed line 30, and the ground plate 40 are located on the same side of the flexible dielectric substrate 10; the upper end of the radiation patch 20 is provided with a first fan-shaped patch unit 21, the middle end is provided with a polygonal patch unit 22, and the lower end is provided with a second fan-shaped patch unit 23; the feed line 30 is connected to the bottom of the radiation patch 20, and the feed line 30 is in a rectangular shape; the ground plate 40 is a rectangular structure unit symmetrically distributed on both sides of the feed line 30, and two fan-shaped cut corners 41 are symmetrically arranged at the top end of the ground plate 40 close to the side wall of the feed line 30.

[0041] Specifically, the flexible dielectric substrate of the present application adopts a polydimethylsiloxane (PDMS) flexible base material, so that the antenna can be conformal with complex objects; the radiation patch of the present application adopts the splicing of the upper and lower two fan-shaped structures and the middle one polygonal structure, realizing the working frequency band of the ultra-wideband and the miniaturization of the antenna; the antenna adopts the feed mode of the coplanar waveguide, so that the antenna has fast transmission rate, long transmission distance, and strong anti-interference ability. The design of the radiation patch, the feed line and the ground plate of the present application adopts a completely symmetrical structure on the left and right sides, so as to reduce the loss of antenna performance as much as possible when bending; the antenna structure is compact, small in size and thin in thickness, and is convenient for integration with the radio frequency front-end circuit.

[0042] Optionally, the fan-shaped structure radius of the first fan-shaped patch unit 21 at the upper end of the radiation patch 20 is 10.0 mm, and the fan-shaped structure radius of the second fan-shaped patch unit 23 at the lower end is 6.5 mm; the polygonal structure of the polygonal patch unit 22 at the middle end is cut from a regular hexagon with a side length of 5.6 mm.

[0043] Specifically, the fan-shaped structure radius of the second fan-shaped patch unit 23 is set to be shorter, because it needs to bear a part of the U-shaped groove structure, and since the bottom end of the U-shaped groove in the present application is more sharp, it needs a more curved patch unit part to bear.

[0044] Optionally, the first fan-shaped patch unit 21 is internally provided with a downward-opening fan ring-shaped groove 24; the second fan-shaped patch unit 23 is internally provided with a U-shaped groove 26 with an upward-opening, and the upward-opening of the U-shaped groove 26 extends into the polygonal patch unit 22; the polygonal patch unit 22 is internally provided with a downward-opening C-shaped groove 25.

[0045] Specifically, three different slot lines are opened on the radiation patch, wherein the fan ring slot at the upper edge realizes the notch characteristic of the X uplink wave band, the U-shaped slot at the lower edge realizes the notch characteristic of the WiMAX wave band, and the C-shaped slot in the middle realizes the notch characteristic of the WLAN wave band. The antenna filters out the interference of three narrowband signals on the basis of the ultra-wideband frequency band.

[0046] Optionally, the fan ring slot, the C-shaped slot and the U-shaped slot are mirror symmetrically distributed about the vertical central axis of the antenna.

[0047] Specifically, the fan ring slot, the U-shaped slot and the C-shaped slot are located on the vertical central axis of the antenna and are mirror symmetrically distributed about the vertical central axis, thereby reducing the influence of bending on the performance of the antenna.

[0048] Optionally, the U-shaped slot 26 is located at the lower edge of the second fan-shaped patch unit 23 at the lower end of the radiation patch 20; the C-shaped slot 25 is located inside the U-shaped slot 26 and has an opening downward; and the fan ring slot 24 is located at the upper edge of the first fan-shaped patch unit 21 at the upper end of the radiation patch 20 and has an opening downward.

[0049] Specifically, three different slot structures of different shapes and lengths are loaded on the three patch units on the radiation patch to generate a stop band, filter out three different narrowband signals, eliminate the interference of the three frequency bands, and realize the cooperative communication of the ultra-wideband system and other narrowband communication systems.

[0050] Optionally, the fan ring slot is obtained by cutting a circular ring with a radius of 4.7-4.9 mm, the total length of the slot is 14.18-15.12 mm, and the slot width is 0.3 mm.

[0051] Optionally, the C-shaped slot is obtained by cutting a rectangular ring with a length of 9.5-10 mm and a width of 4.5-5.0 mm, the total length of the slot is 23.0-25.0 mm, and the slot width is 0.25 mm.

[0052] Optionally, the U-shaped slot is obtained by cutting a regular hexagonal ring with a side length of 7.4 mm, the total length of the slot is 29.53-30.43 mm, and the slot width is 0.26 mm.

[0053] Specifically, by designing the shape, size and slot width of the fan ring slot, the C-shaped slot and the U-shaped slot, the notch characteristics of the X uplink wave band, the WiMAX wave band and the WLAN wave band are realized, so that the antenna filters out the interference of three narrowband signals on the basis of the ultra-wideband frequency band, and the antenna has the characteristics of multiple notches.

[0054] Optionally, the characteristic impedance of the feed line 30 is 50 Ω, the length of the feed line 30 is 11.6 mm, and the width of the feed line 30 is 2.3 mm.

[0055] Specifically, the rectangular feed line 30 is connected to the bottom of the radiating patch 20, and its dimensions are 11.6 mm in length and 2.3 mm in width, and the characteristic impedance of the feed line is 50 Ω.

[0056] Figure 2 A radiating patch structure diagram of a flexible, bendable, ultra-wideband printed antenna with triple-notch characteristics is shown. (Example) Figure 2 As shown, the radial patch 20 is composed of an upper first sector-shaped patch unit 21, a lower second sector-shaped patch unit 23, and a middle polygonal patch unit 22. The upper first sector-shaped patch unit 21 has a radius of 10.0 mm, the lower second sector-shaped patch unit 23 has a radius of 6.5 mm, and the middle polygonal patch unit 22 is obtained by cutting a regular hexagon with a side length of 5.6 mm. A U-shaped groove 26 is introduced into the lower second sector-shaped patch unit 23 of the radial patch 20 and extends upward to the polygonal patch unit 22. The U-shaped groove 26 is obtained by cutting a regular hexagonal ring with a side length of 7.4 mm. The total length of the groove is 29.53-30.43 mm, and the groove width is... 0.26mm; A downward-opening C-shaped slot 25 is introduced inside the U-shaped slot 26, and this slot is located in the polygonal patch unit 22. The C-shaped slot 25 is obtained by cutting a rectangular ring with a length of 9.5-10mm and a width of 4.5-5.0mm, with a total slot length of 23.0-25.0mm and a slot width of 0.25mm; A fan-shaped annular slot 24 is introduced inside the first fan-shaped patch unit 21 at the upper end, with an opening direction of downward. The fan-shaped annular slot 24 is obtained by cutting a circular ring with a radius of 4.7-4.9mm, with a total slot length of 14.18-15.12mm and a slot width of 0.3mm; The three slots are all mirror-symmetrically distributed about the vertical central axis of the antenna, reducing the impact of bending on the antenna performance.

[0057] Optionally, the grounding plates 40 located on both sides of the feeder 30 have a length of 13.1 mm, a width of 12.7 mm, and a radius of 8.2 mm for the fan-shaped chamfer 41.

[0058] Specifically, the ground plane 40 is located on the lower end of the same side as the radiating patch 20 and symmetrically distributed on both sides of the rectangular feed line 30. Two fan-shaped chamfers are symmetrically arranged at the top of the side closest to the feed line. The length of both ground planes is 13.1 mm, the width is 12.7 mm, and the radius of the two fan-shaped chamfers is 8.2 mm. The use of a chamfered ground plane structure further improves the overall performance of the antenna.

[0059] Optionally, the flexible dielectric substrate is made of polydimethylsiloxane (PDMS) substrate, and the flexible dielectric substrate has a length of 39.0 mm, a width of 28.0 mm, and a thickness of 0.5 mm.

[0060] Specifically, the flexible bendable ultra-wideband printed antenna with the triple notch characteristic in the embodiment is printed on a polydimethylsiloxane (PDMS) flexible substrate with a length of 39.0 mm, a width of 28.0 mm, and a height of 0.5 mm. The relative dielectric constant of the flexible medium substrate 10 is 2.67, and the dielectric loss tangent is 0.0375.

[0061] To further illustrate the good bending and radiation performance of the flexible bendable ultra-wideband printed antenna with the triple notch characteristic, modeling simulation and bending performance test are performed using electromagnetic simulation software (High Frequency Structure Simulator, HFSS).

[0062] It should be noted that S11 in HFSS is a kind of reflection coefficient, and S11 in dB is the return loss. The calculation formula of the reflection coefficient S11 is S11 = Pr / Pin, where S11 is equal to the reflected power divided by the incident power, which is a power ratio. The conversion formula of S11 into the return loss S11 in dB is 10·lgS11 (coefficient) = S11 (dB).

[0063] Referring to Figure 3 , the frequency band with a return loss S11 lower than -10 dB of the antenna is 2-10.7 GHz, covering the frequency band range of ultra-wideband. The three slot structures achieve the notches of 3.3-3.8 GHz, 4.9-5.8 GHz, and 7.8-8.46 GHz, shielding the electromagnetic interference of WiMAX, WLAN, and X uplink bands.

[0064] Referring to Figure 4a and Figure 4b in FIG. 4, the E-plane Figure 4a ) and H-plane Figure 4b ) patterns of the antenna at 4.1 GHz, 6.7 GHz, and 9 GHz are shown. It can be seen that the E-plane presents an "8" shape, indicating that the antenna has a certain directivity, and the H-plane presents a circular shape, indicating that the antenna has good omnidirectional radiation characteristics.

[0065] Referring to Figure 5 , the gain of the flexible bendable ultra-wideband printed antenna with the triple notch characteristic is between 2-5 dBi in the working frequency band, and in the three notch frequency bands, the gain decreases significantly and is less than 0 dBi, indicating that the antenna produces good notch effect in the three target frequency bands.

[0066] Referring to Figure 6a and Figure 6bThe flexible bendable ultra-wideband printed antenna with the three-trap characteristic according to the present application conforms to an ideal cylinder with a radius of R along a long side and a short side of the antenna respectively. Figure 6a When the antenna is bent along the short side (, and the bending radius is greater than 40 mm, the antenna has excellent radiation performance, and the return loss graph shows that the antenna covers the ultra-wideband frequency range of 2.0-10.75 GHz, and the trap frequency bands all include 3.36-3.9 GHz, 4.7-5.65 GHz and 7.8-8.6 GHz. When the bending radius continues to decrease, only the trap performance of the X band decreases, and other frequency bands still meet the frequency range requirements of the trap ultra-wideband antenna. Figure 6b When the antenna is bent along the long side (, and the bending radius is greater than 15 mm, the antenna has excellent radiation performance, and the return loss graph shows that the antenna covers the ultra-wideband frequency range of 2.1-10.7 GHz, and the trap frequency bands all include 3.4-3.95 GHz, 4.75-5.75 GHz and 7.7-8.65 GHz. When the bending radius continues to decrease, the trap performance at the X band decreases, and other frequency bands still meet the frequency range requirements of the trap ultra-wideband antenna. The above test results show that the antenna has excellent bending performance.

[0067] The flexible bendable ultra-wideband printed antenna with the three-trap characteristic according to the above embodiment has the characteristics of small size, simple manufacturing, strong anti-interference ability and excellent bending performance. The upper and lower fan-shaped radiation patches with the polygonal structure change the antenna surface current distribution, realize the ultra-wideband working frequency range (2-10.7 GHz) and the miniaturization of the antenna, and generate three different narrowband signals (3.3-3.8 GHz, 4.9-5.8 GHz and 7.8-8.46 GHz) by loading three different slot structures on the radiation patch, thereby shielding the interference of WiMAX, WLAN and X uplink bands and realizing the collaborative communication of the ultra-wideband system and other narrowband communication systems. The cutting angle ground plate structure further improves the overall performance of the antenna. The polydimethylsiloxane (PDMS) is used as the flexible substrate of the antenna, and the antenna has the advantages of small size, thin thickness, compact structure, good bending performance, easy integration with the radio frequency front-end circuit, and conformability to complex objects.

[0068] Note that the above merely describes preferred embodiments of the present application and the applied technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, reconfigurations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the technical concept of the present application, and all of them belong to the scope of protection of the present application.

[0069] The above merely describes embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A flexible bendable ultra-wideband printed antenna having a triple notch characteristic, comprising: Flexible medium substrate (10), radiation patch (20), feed line (30), ground plate (40), characterized in that: The flexible medium substrate (10) adopts a polydimethylsiloxane (PDMS) base material, and the radiation patch (20), the feed line (30) and the ground plate (40) are located on the same side of the flexible medium substrate (10); The upper end of the radiation patch (20) is provided with a first fan-shaped patch unit (21), the middle end is provided with a polygonal patch unit (22), and the lower end is provided with a second fan-shaped patch unit (23); The feed line (30) is connected with the bottom of the radiation patch (20), and the feed line (30) is in a rectangular shape; The ground plate (40) is a rectangular structure unit symmetrically distributed on both sides of the feed line (30), and two fan-shaped cut corners (41) are symmetrically arranged at the top end of the ground plate (40) close to the side wall of the feed line (30); The fan-shaped structure radius of the first fan-shaped patch unit (21) at the upper end of the radiation patch (20) is 10.0mm, the fan-shaped structure radius of the second fan-shaped patch unit (23) at the lower end is 6.5mm, and the polygonal structure of the polygonal patch unit (22) at the middle end is taken from a regular hexagon with a side length of 5.6mm; The first fan-shaped patch unit (21) is internally provided with a fan ring-shaped groove (24) opening downward; The second fan-shaped patch unit (23) is internally provided with a U-shaped groove (26) opening upward, and the opening of the U-shaped groove (26) extends upward into the polygonal patch unit (22); The polygonal patch unit (22) is internally provided with a C-shaped groove (25) opening downward; The fan ring-shaped groove (24), the C-shaped groove (25) and the U-shaped groove (26) are all mirror-symmetrically distributed about the vertical central axis of the antenna; The U-shaped groove (26) is located at the lower edge of the second fan-shaped patch unit (23) at the lower end of the radiation patch (20); The C-shaped groove (25) is located inside the U-shaped groove (26), and its opening is downward; The fan ring-shaped groove (24) is located at the upper edge of the first fan-shaped patch unit (21) at the upper end of the radiation patch (20), and its opening direction is downward; The fan ring-shaped groove (24) is obtained by cutting a circular ring with a radius of 4.7-4.9mm, the total length of the groove is 14.18-15.12mm, and the groove width is 0.3mm; The C-shaped groove (25) is obtained by cutting a rectangular ring with a length of 9.5-10.0mm and a width of 4.5-5.0mm, the total length of the groove is 23.0-25.0mm, and the groove width is 0.25mm; The U-shaped groove (26) is obtained by cutting a regular hexagonal ring with a side length of 7.4mm, the total length of the groove is 29.53-30.43mm, and the groove width is 0.26mm; The characteristic impedance of the feed line (30) is 50Ω, the length of the feed line (30) is 11.6mm, and the width is 2.3mm; The ground plate (40) located on both sides of the feeder line (30) has a length of 13.1 mm, a width of 12.7 mm, and the fan-shaped cut corner (41) has a radius of 8.2 mm; The flexible medium substrate (10) has a length of 39.0 mm, a width of 28.0 mm, and a thickness of 0.5 mm.

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