An ultra-wideband polarization reconfigurable anti-interference antenna

Abstract

The present invention provides an ultra-wideband polarization reconfigurable anti-interference antenna. The antenna includes a dielectric substrate, a printed monopole antenna board, a radio frequency switch, a metal floor, and a microstrip feeder strip. The printed monopole antenna board includes first, second, and third stepped structures. The microstrip feeder strip includes first and second microstrip feeder strips. The first and second microstrip feeder strips are provided with first and second slots. The printed monopole antenna board also includes first and second U-shaped slot structures, with the U-shaped openings of the first and second U-shaped slot structures facing the first and second microstrip feeder strips. The radio frequency switch includes first, second, third, and fourth switches. The first and second switches are provided on the first and second slots, and the third and fourth switches are provided on the first and second U-shaped slot structures. The ultra-wideband polarization reconfigurable anti-interference antenna provided by the present invention improves the performance of the band-stop filter by adding mutually perpendicular and overlapping U-shaped slots to the antenna radiating element.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of printed antennas, and in particular to an ultra-wideband polarization reconfigurable anti-interference antenna. Background Art

[0002] UWB (Ultra Wide Band) is a carrier-free communication technology that transmits data using narrow, non-sinusoidal pulses in the nanosecond to microsecond range. Therefore, it occupies a large spectrum, and despite using wireless communication, its data transmission rate can reach over hundreds of megabits per second. UWB technology offers advantages such as low system complexity, low power spectral density of transmitted signals, insensitivity to channel fading, low interception capability, high positioning accuracy, and strong penetration. It is particularly suitable for high-speed wireless access in dense multipath environments, such as indoor locations. Since 2019, with the release of new UWB technology products, including the iPhone series, and the development of digital key specifications by renowned companies and organizations such as Apple and the Car Connectivity Consortium (CCC), UWB technology and its corresponding systems have garnered widespread attention and application within the technology and IoT communities.

[0003] The rapid development of mobile communications and the increasing number of users have placed higher demands on the antennas used in mobile devices and wireless systems' transceiver terminals. Communication terminals use two orthogonal polarizations to transmit two signals, saving bandwidth, increasing channel capacity, mitigating the negative effects of multipath fading, and maximizing received signals. However, currently used dual-polarization antennas with polarization diversity typically require two linearly polarized antennas placed vertically, which takes up a significant amount of space. Simultaneously, the explosive growth of IoT devices has led to increasingly dense frequency usage. Because ultra-wideband systems occupy a wide bandwidth, they must share spectrum with existing narrowband standards like Wi-Fi. These frequency bands can become potential sources of interference, hindering the effective real-time operation of UWB systems. To minimize interference between UWB systems and other narrowband systems while ensuring the proper functioning of all communication systems, next-generation UWB systems will require the implementation of relevant anti-interference technologies. To mitigate potential interference between UWB systems and multiple narrowband systems of varying standards, multiple band-stop filters are typically incorporated into the UWB system. These band-stop filters must be configured to correspond to different frequencies and cascaded to enhance interference mitigation. But this will undoubtedly increase the size, complexity and cost of the system.

[0004] Therefore, it is necessary to provide an ultra-wideband polarization reconfigurable anti-interference antenna to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an ultra-wideband polarization reconfigurable anti-interference antenna. By adding mutually perpendicular and overlapping U-shaped slots on the antenna radiation unit, the band-stop filter performance is increased, and the anti-interference effect of the WIFI communication standard is achieved.

[0006] The technical solution adopted by the present invention to solve the above technical problems is to provide an ultra-wideband polarization reconfigurable anti-interference antenna, which includes a dielectric substrate, a printed monopole antenna board, a radio frequency switch, a metal floor and a microstrip feed line conductor;

[0007] The printed monopole antenna board includes a first step structure, a second step structure, and a third step structure; the first step structure includes a first step, a second step, a third step, and a fourth step, and the first step structure is a horizontal step structure on the monopole antenna board; the second step structure includes a fifth step, a sixth step, a seventh step, and an eighth step, and the second step structure is a vertical step structure on the monopole antenna board; the third step structure includes a ninth step, a tenth step, an eleventh step, and a twelfth step, and the third step structure is a step structure shared by the horizontal and vertical directions on the monopole antenna board;

[0008] The microstrip feed line conductive strip includes a first microstrip feed conductive strip and a second microstrip feed conductive strip, wherein the first microstrip feed conductive strip is a horizontal microstrip feed conductive strip, and the second microstrip feed conductive strip is a vertical microstrip feed conductive strip; a first slot is provided on the first microstrip feed conductive strip, and a second slot is provided on the second microstrip feed conductive strip;

[0009] The printed monopole antenna board further includes a first U-shaped slot structure and a second U-shaped slot structure, wherein the first U-shaped slot structure is a horizontal slot structure, and the U-shaped opening of the first U-shaped slot structure faces the first microstrip feed conductive strip; the second U-shaped slot structure is a vertical slot structure, and the U-shaped opening of the second U-shaped slot structure faces the second microstrip feed conductive strip;

[0010] The RF switch includes a first switch, a second switch, a third switch and a fourth switch. The first switch is set on the first gap, the second switch is set on the second gap, the third switch is set on the first U-shaped gap structure, and the fourth switch is set on the second U-shaped gap structure.

[0011] Preferably, the radio frequency switch includes a PIN diode switch, a radio frequency microwave MEMS switch and a light control device, and the radio frequency switch is used to control and change the aperture and structure of the antenna.

[0012] Preferably, the first switch and the second switch are used to control the on and off of the transmission current on the first microstrip feed strip and the second microstrip feed strip to form the polarization reconfigurable characteristics of the antenna; the third switch and the fourth switch are used to control the on and off of the band-stop performance generated by the first U-shaped slot structure and the second U-shaped slot structure to form the frequency reconfigurable anti-interference characteristics of the antenna.

[0013] Preferably, the first step structure, the second step structure and the third step structure are respectively distributed in a right-angled zigzag shape; the side where the first step is located intersects with the side where the fifth step is located, and the two sides intersect at 90 degrees to form a corner of a rectangle.

[0014] Preferably, the metal floor includes a first floor structure, a second floor structure and a third floor structure, the first floor structure is a vertical floor structure, the second floor structure is a horizontal floor structure, and the third floor structure is an L-shaped common floor structure.

[0015] Preferably, the first step structure and the third step structure are based on the first microstrip feeding conductive strip, and the first step, the second step, the third step and the fourth step are symmetrical with the ninth step, the tenth step, the eleventh step and the twelfth step respectively; the second step structure and the third step structure are based on the second microstrip feeding conductive strip, and the ninth step, the tenth step, the eleventh step and the twelfth step are symmetrical with the fifth step, the sixth step, the seventh step and the eighth step respectively.

[0016] Preferably, the height of the first step is 1 mm; the width of the second step is 1.4 mm and the height is 1.3 mm; the width of the third step is 1.3 mm and the height is 1.4 mm; the width of the fourth step is 1 mm and the height is 0.7 mm.

[0017] Preferably, the projection distance between the first step and the metal floor is 0.04-0.2 times the bottom width of the metal floor; the metal floor is arranged on the reverse side of the dielectric substrate, the width of the third floor structure is 0.3-0.5 times the longest working wavelength, the height of the metal floor is 0.1-0.4 times the width of the metal floor, and the sum of the height of the metal floor and the height of the printed monopole antenna board is 0.4-0.6 times the longest working wavelength.

[0018] Preferably, the rectangular grooves in the horizontal direction of the bottom edge and the vertical direction of the side edge of the third floor structure are used for in-band matching with the printed monopole antenna board; the two rectangular grooves have the same size and shape and are placed on the lower side of the first microstrip feed conductive strip and on the left side of the second microstrip feed conductive strip.

[0019] Preferably, the width of the two rectangular slots is 1.2-1.8 times the width of the first microstrip feed strip or the second microstrip feed strip, the height of the two rectangular slots is 0.4-0.9 times the height of the first floor structure or the second floor structure, the width of the two rectangular slots is 0.3-0.5 times the longest operating wavelength, and the height of the two rectangular slots is 0.1-0.4 times the width of the metal floor.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides an ultra-wideband polarization reconfigurable anti-interference antenna, wherein the microstrip feed strip includes a first microstrip feed strip and a second microstrip feed strip, the first microstrip feed strip being a horizontal microstrip feed strip, and the second microstrip feed strip being a vertical microstrip feed strip; a first slot is provided on the first microstrip feed strip, and a second slot is provided on the second microstrip feed strip; the printed monopole antenna board also includes a first U-shaped slot structure and a second U-shaped slot structure, the first U-shaped slot structure being a horizontal slot structure, the U-shaped opening of the first U-shaped slot structure facing the first microstrip feed strip; the second U-shaped slot structure being a vertical slot structure, the U-shaped opening of the second U-shaped slot structure facing the second microstrip feed strip; by providing the first and second slots on the first and second microstrip feed strips, and adding the mutually perpendicular and overlapping first and second U-shaped slot structures on the printed monopole antenna board, the antenna improves the band-stop filter performance and achieves anti-interference effect for WIFI communication standards;

[0022] Furthermore, the antenna is given polarization switchability through a radio frequency switch. That is, by controlling the on / off switching of the loaded switch device or changing the feeding method, the current distribution on the antenna surface is changed. Under the condition that the operating frequency and radiation direction remain unchanged, beams with different polarization modes are radiated. Since the polarization reconfigurable antenna can switch between multiple orthogonal polarization modes, the system antenna cost can be reduced while eliminating the adverse effects of signal fading caused by multipath effects on the wireless communication system. The use of reconfigurable polarization diversity technology can also improve spectrum utilization, further increasing the capacity of the communication system.

[0023] Furthermore, the RF switch includes a first switch, a second switch, a third switch, and a fourth switch, the first switch being arranged on the first slot, the second switch being arranged on the second slot, the third switch being arranged on the first U-shaped slot structure, and the fourth switch being arranged on the second U-shaped slot structure, wherein each slot is loaded with an electrically controllable switch, and the current distribution on the antenna surface is changed by controlling the on / off state of the switch, thereby changing the frequency characteristics of the antenna, and realizing the suppression of the ultra-wideband antenna against the external interference source of WIFI interference signals around 5.5 GHz;

[0024] Furthermore, by implementing polarization diversity in the antenna and then miniaturizing it, the original two antennas are combined into one, achieving a compact single antenna that can achieve the polarization diversity performance of two separate antennas. Compared with single-polarization antennas, polarization diversity antennas have stronger anti-interference capabilities, can reduce the impact of polarization mismatch and channel interference, and can meet the requirements of ultra-wideband standard frequency bands, meeting the process design requirements of today's mobile terminal miniaturization.

[0025] Furthermore, the multi-stage stepped polarization diversity antenna has a low profile and is composed of rectangular metal strips of different sizes. It has a simple structure, is easy to implement in terms of process, and is easy to integrate with circuits.

[0026] Furthermore, the metal floor and the printed monopole antenna are respectively arranged on the back and front sides of the dielectric substrate, thereby better realizing ultra-wideband characteristics;

[0027] Furthermore, the microstrip feeder conductor is arranged on the front of the dielectric plate. The microstrip feeder conductor is also a rectangular structure and is located below and to the left of the monopole antenna plate, respectively, to easily achieve impedance matching.

[0028] Furthermore, the ultra-wideband polarization reconfigurable anti-interference antenna provided by the present invention has a width and height of only 2 cm, a printed plane area of ​​only 4 square centimeters, and a very compact structure. Performance tests have shown that it can cover the ultra-wideband (3.1-10.6 GHz) communication frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the accompanying drawings, the same reference numerals represent the same components.

[0030] Figure 1A schematic structural diagram of an ultra-wideband antenna with polarization diversity provided by one embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna monopole designed based on an ultra-wideband antenna with polarization diversity according to an embodiment of the present invention;

[0032] Figure 3 A return loss curve diagram of an ultra-wideband antenna with polarization diversity provided by one embodiment of the present invention;

[0033] Figure 4 A return loss curve diagram of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna after achieving a band-stop function, provided by one embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with vertical polarization at 6 GHz provided by one embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the H-plane radiation direction of the vertically polarized anti-interference ultra-wideband antenna with adjustable frequency and polarization and reconfigurable polarization at 6 GHz provided by one embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with vertical polarization at 8 GHz provided by one embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the H-plane radiation direction of the vertically polarized anti-interference ultra-wideband antenna with adjustable frequency and polarization and reconfigurable polarization at 8 GHz provided by one embodiment of the present invention;

[0038] Figure 9 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with vertical polarization at 10 GHz provided by one embodiment of the present invention;

[0039] Figure 10 A schematic diagram of the H-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with vertical polarization at 10 GHz provided by one embodiment of the present invention;

[0040] Figure 11 A schematic diagram of the E-plane radiation direction of a horizontally polarized, frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at 6 GHz provided by one embodiment of the present invention;

[0041] Figure 12A schematic diagram of the H-plane radiation direction of the horizontally polarized anti-interference ultra-wideband antenna with adjustable frequency and polarization and reconfigurable polarization at 6 GHz provided by one embodiment of the present invention;

[0042] Figure 13 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with horizontal polarization at 8 GHz provided by one embodiment of the present invention;

[0043] Figure 14 A schematic diagram of the H-plane radiation direction of the horizontally polarized anti-interference ultra-wideband antenna with adjustable frequency and polarization and reconfigurable polarization at 8 GHz provided by one embodiment of the present invention;

[0044] Figure 15 A schematic diagram of the E-plane radiation direction of a horizontally polarized, frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at 10 GHz provided by one embodiment of the present invention;

[0045] Figure 16 A schematic diagram of the H-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna with horizontal polarization at 10 GHz is provided in one embodiment of the present invention.

[0046] Figure Number:

[0047] 11- dielectric substrate;

[0048] 111-first step; 112-second step; 113-third step; 114-fourth step;

[0049] 121-fifth step; 122-sixth step; 123-seventh step; 124-eighth step;

[0050] 131-9th step; 132-10th step; 133-11th step; 134-12th step;

[0051] 211-first floor structure; 212-second floor structure; 213-third floor structure;

[0052] 221-first defective structure; 222-second defective structure;

[0053] 301-first microstrip feeding conductive strip; 302-second microstrip feeding conductive strip;

[0054] 411-first gap; 412-second gap;

[0055] 421-first U-shaped gap structure; 422-second U-shaped gap structure;

[0056] 511 - first switch; 512 - second switch; 521 - third switch; 522 - fourth switch. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0059] With the increasing requirements of systems such as the Internet of Things and communications, antenna systems are becoming more and more complex, and reducing the number, size and weight of antennas is of great significance.

[0060] The technical problem to be solved by the present invention is to provide an ultra-wideband polarization reconfigurable anti-interference antenna. By adding mutually perpendicular and overlapping U-shaped slots on the antenna radiation unit, the band-stop filter performance is increased, and the anti-interference effect of the WIFI communication standard is achieved.

[0061] See now Figure 1-Figure 2 The embodiment of the present invention discloses an ultra-wideband polarization reconfigurable anti-interference antenna, which includes a dielectric substrate 11, a printed monopole antenna board, a radio frequency switch, a metal floor and a microstrip feed line conductor.

[0062] Specifically, the antenna is arranged on the front side of the dielectric substrate 11, and the metal floor is arranged on the back side of the dielectric substrate 11. The printed monopole antenna board contains two radiating direction units, one for horizontal and one for vertical polarization. Both radiating direction units cover the ultra-wideband communication frequency band, achieving polarization diversity. The dielectric constant of the dielectric substrate is 2-10, and the loss tangent is less than or equal to 10. -3 , thickness is less than or equal to 3mm.

[0063] The printed monopole antenna board includes a first step structure, a second step structure and a third step structure; the first step structure includes a first step 111, a second step 112, a third step 113 and a fourth step 114, and the first step structure is a horizontal step structure on the monopole antenna board; the second step structure includes a fifth step 121, a sixth step 122, a seventh step 123 and an eighth step 124, and the second step structure is a vertical step structure on the monopole antenna board; the third step structure includes a ninth step 131, a tenth step, an eleventh step and a twelfth step, and the third step structure is a step structure shared in the horizontal and vertical directions on the monopole antenna board.

[0064] Specifically, the multi-stepped structure on the left side of the vertically polarized radiating element is shared with the multi-stepped structure on the bottom side of the horizontally polarized radiating element, reducing the footprint of a conventional dual-polarized ultra-wideband antenna. The step height of the vertically polarized radiating element corresponds to the step width of the horizontally polarized radiating element, and their magnitudes are equal. The heights of the fourth and eighth steps are higher than the heights of the first floor structure 211 and the second floor structure 212, respectively.

[0065] The microstrip feed strip includes a first microstrip feed strip 301 and a second microstrip feed strip 302. The first microstrip feed strip 301 is a horizontal microstrip feed strip, and the second microstrip feed strip 302 is a vertical microstrip feed strip. A first slot 411 is provided on the first microstrip feed strip 301, and a second slot 412 is provided on the second microstrip feed strip 302.

[0066] The printed monopole antenna board also includes a first U-shaped slot structure 421 and a second U-shaped slot structure 422. The first U-shaped slot structure 421 is a horizontal slot structure, and the U-shaped opening of the first U-shaped slot structure 421 faces the first microstrip feed conductive strip 301; the second U-shaped slot structure 422 is a vertical slot structure, and the U-shaped opening of the second U-shaped slot structure 422 faces the second microstrip feed conductive strip 302.

[0067] The RF switch includes a first switch 511, a second switch 512, a third switch 521 and a fourth switch 522. The first switch 511 is set on the first slot 411, the second switch 512 is set on the second slot 412, the third switch 521 is set on the first U-shaped slot structure 421, and the fourth switch 522 is set on the second U-shaped slot structure 422.

[0068] In a specific implementation, the radio frequency switch includes a PIN diode switch, a radio frequency microwave MEMS switch, and a light-controlled device, and the radio frequency switch is used to control and change the aperture and structure of the antenna.

[0069] In a specific implementation, the first switch 511 and the second switch 512 are used to control the on and off of the transmission current on the first microstrip feed strip 301 and the second microstrip feed strip 302 to form the polarization reconfigurable characteristics of the antenna; the third switch 521 and the fourth switch 522 are used to control the on and off of the band-stop performance generated by the first U-shaped slot structure 421 and the second U-shaped slot structure 422 to form the frequency reconfigurable anti-interference characteristics of the antenna.

[0070] In a specific implementation, the first step structure, the second step structure and the third step structure are respectively distributed in a right-angled sawtooth shape; the side where the first step 111 is located intersects with the side where the fifth step 121 is located, and the two sides intersect at 90 degrees to form a corner of a rectangle.

[0071] Specifically, each side of the first, second, and third stepped structures has four steps, and the four steps are arranged in a right-angled sawtooth pattern. The second floor structure 212 corresponding to the radiating direction unit with a vertical polarization direction is horizontal, and the corresponding second microstrip feeder strip 302 is vertical. The unit with the vertical polarization direction has four steps on each side, with the vertical direction as the reference, and the step width gradually increases from bottom to top. The first floor structure 211 corresponding to the radiating direction unit with a horizontal polarization direction is vertical, and the corresponding first microstrip feeder strip 301 is horizontal. The radiating direction unit with a horizontal polarization direction has four steps on each side, with the horizontal direction as the reference, and the step width gradually increases from bottom to top. The side where the first step 111 is located intersects with the side where the fifth step 121 is located, and the two sides intersect at 90 degrees to form a corner of a rectangle. This part retains the shape of one corner of the rectangle. The retained shape of one corner of the rectangle ensures a sufficient ultra-wideband radiation area without increasing the overall size of the antenna to ensure overall in-band matching and gain.

[0072] In a specific implementation, the metal floor includes a first floor structure 211, a second floor structure 212 and a third floor structure 213. The first floor structure 211 is a vertical floor structure, the second floor structure 212 is a horizontal floor structure, and the third floor structure 213 is an L-shaped common floor structure.

[0073] In a specific implementation, the first stepped structure and the third stepped structure are based on the first microstrip feed conductive strip 301, and the first step 111, the second step 112, the third step 113 and the fourth step 114 are symmetrical with the ninth step 131, the tenth step 132, the eleventh step 133 and the twelfth step 134 respectively; the second stepped structure and the third stepped structure are based on the second microstrip feed conductive strip 302, and the ninth step 131, the tenth step 132, the eleventh step 133 and the twelfth step 134 are symmetrical with the fifth step 121, the sixth step 122, the seventh step 123 and the eighth step 124 respectively.

[0074] In a specific implementation, the height of the first step 111 is 1 mm; the width of the second step 112 is 1.4 mm and the height is 1.3 mm; the width of the third step 113 is 1.3 mm and the height is 1.4 mm; the width of the fourth step 114 is 1 mm and the height is 0.7 mm. The shape and size parameters of the steps on the left and right sides of the radiating directional element with a horizontal polarization direction are the same as those of the radiating directional element with a vertical polarization direction.

[0075] In a specific implementation, the projection distance between the first step 111 and the metal floor is 0.04-0.2 times the bottom width of the metal floor; the metal floor is arranged on the reverse side of the dielectric substrate 11, the width of the third floor structure 213 is 0.3-0.5 times the longest operating wavelength, the height of the metal floor is 0.1-0.4 times the width of the metal floor, and the sum of the height of the metal floor and the height of the printed monopole antenna board is 0.4-0.6 times the longest operating wavelength.

[0076] In a specific implementation, the rectangular grooves in the horizontal bottom and vertical sides of the third floor structure 213 are used for in-band matching with the printed monopole antenna board. The two rectangular grooves are identical in size and shape and are located on the bottom side of the first microstrip feed strip 301 and to the left of the second microstrip feed strip 302. The two rectangular grooves are defective ground structures according to the present invention, used for in-band matching with the printed monopole antenna board, achieving ultra-wideband characteristics in both horizontal and vertical polarization directions. The rectangular grooves of the first vertical defective ground structure 221 and the second horizontal defective ground structure 222 are identical in size and shape.

[0077] In a specific implementation, the width of the two rectangular slots is 1.2-1.8 times the width of the first microstrip feed strip 301 or the second microstrip feed strip 302, the height of the two rectangular slots is 0.4-0.9 times the height of the first floor structure 211 or the second floor structure 212, the width of the two rectangular slots is 0.3-0.5 times the longest operating wavelength, and the height of the two rectangular slots is 0.1-0.4 times the width of the metal floor.

[0078] Combined with reference Figure 3-Figure 4 , Figure 3 A return loss curve diagram of an ultra-wideband antenna with polarization diversity provided by one embodiment of the present invention is provided. Figure 3 The vertical axis is return loss / dB, and the horizontal axis is frequency / GHz. Figure 3 It can be seen that both polarization directions of the frequency-adjustable polarization-reconfigurable anti-interference ultra-wideband antenna in this embodiment can operate in the 3-12 GHz frequency band, and the return loss in the ultra-wideband (3.1-10.6 GHz) frequency band is less than -10 dB, which can cover the entire ultra-wideband wireless standard frequency band. Figure 4 A return loss curve diagram of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna after achieving a band-stop function, provided by one embodiment of the present invention. Figure 4 The vertical axis is return loss / dB, and the horizontal axis is frequency / GHz. Figure 4 It can be seen that in this embodiment, when the third switch 521 and the fourth switch 522 are turned off and the first U-shaped slot structure 421 and the second U-shaped slot structure 422 are turned on, the two polarization directions of the frequency-adjustable polarization reconfigurable anti-interference ultra-wideband antenna realize the change of the antenna frequency characteristics, thereby realizing the suppression of external WIFI interference signals by the ultra-wideband antenna.

[0079] Figure 5 、 Figure 6 Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna in the vertical polarization direction at 6 GHz provided by an embodiment of the present invention; Figure 7 、 Figure 8 Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna in the vertical polarization direction at 8 GHz provided by an embodiment of the present invention; Figure 9 、 Figure 10 Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna in the vertical polarization direction at 10 GHz frequency point provided by an embodiment of the present invention. Figure 11 、 Figure 12Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna in the horizontal polarization direction at 6 GHz provided by an embodiment of the present invention; Figure 13 、 Figure 14 Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna in the horizontal polarization direction at 8 GHz provided by an embodiment of the present invention; Figure 15 、 Figure 16 Schematic diagrams of the E-plane and H-plane radiation directions of the frequency-adjustable, polarized, reconfigurable, anti-interference ultra-wideband antenna in the horizontal polarization direction at 10 GHz, respectively, provided by an embodiment of the present invention. From the radiation patterns at 6 GHz, 8 GHz, and 10 GHz within the ultra-wideband frequency band, it can be seen that the directional patterns of the frequency-adjustable, polarized, reconfigurable, anti-interference ultra-wideband antenna in the vertical polarization direction and the horizontal polarization direction on the E-plane are at a 90-degree relationship. The frequency-adjustable, polarized, reconfigurable, anti-interference ultra-wideband antenna has relatively good omnidirectionality in both the vertical polarization direction and the horizontal polarization direction on the H-plane, achieving relatively obvious monopole radiation characteristics and meeting the requirements of reconfigurable polarization diversity in two directions.

[0080] In summary, the embodiment of the present application provides an ultra-wideband polarization reconfigurable anti-interference antenna, wherein the microstrip feed strip includes a first microstrip feed strip and a second microstrip feed strip, the first microstrip feed strip is a horizontal microstrip feed strip, and the second microstrip feed strip is a vertical microstrip feed strip; a first slot is provided on the first microstrip feed strip, and a second slot is provided on the second microstrip feed strip; the printed monopole antenna board also includes a first U-shaped slot structure and a second U-shaped slot structure, the first U-shaped slot structure The slot structure is a horizontal slot structure, with the U-shaped opening of the first U-shaped slot structure facing the first microstrip feed conductor; the second U-shaped slot structure is a vertical slot structure, with the U-shaped opening of the second U-shaped slot structure facing the second microstrip feed conductor; by providing the first and second slots on the first and second microstrip feed conductors, and adding the first and second U-shaped slot structures that are perpendicular and overlap with each other on the printed monopole antenna board, the antenna improves the band-stop filter performance and achieves anti-interference effect for WiFi communication standards;

[0081] Furthermore, the antenna is given polarization switchability through a radio frequency switch. That is, by controlling the on / off switching of the loaded switch device or changing the feeding method, the current distribution on the antenna surface is changed. Under the condition that the operating frequency and radiation direction remain unchanged, beams with different polarization modes are radiated. Since the polarization reconfigurable antenna can switch between multiple orthogonal polarization modes, the system antenna cost can be reduced while eliminating the adverse effects of signal fading caused by multipath effects on the wireless communication system. The use of reconfigurable polarization diversity technology can also improve spectrum utilization, further increasing the capacity of the communication system.

[0082] Furthermore, the RF switch includes a first switch, a second switch, a third switch, and a fourth switch, the first switch being arranged on the first slot, the second switch being arranged on the second slot, the third switch being arranged on the first U-shaped slot structure, and the fourth switch being arranged on the second U-shaped slot structure, wherein each slot is loaded with an electrically controllable switch, and the current distribution on the antenna surface is changed by controlling the on / off state of the switch, thereby changing the frequency characteristics of the antenna, and realizing the suppression of the ultra-wideband antenna against the external interference source of WIFI interference signals around 5.5 GHz;

[0083] Furthermore, by implementing polarization diversity in the antenna and then miniaturizing it, the original two antennas are combined into one, achieving a compact single antenna that can achieve the polarization diversity performance of two separate antennas. Compared with single-polarization antennas, polarization diversity antennas have stronger anti-interference capabilities, can reduce the impact of polarization mismatch and channel interference, and can meet the requirements of ultra-wideband standard frequency bands, meeting the process design requirements of today's mobile terminal miniaturization.

[0084] Furthermore, the multi-stage stepped polarization diversity antenna has a low profile and is composed of rectangular metal strips of different sizes. It has a simple structure, is easy to implement in terms of process, and is easy to integrate with circuits.

[0085] Furthermore, the metal floor and the printed monopole antenna are respectively arranged on the back and front sides of the dielectric substrate, thereby better realizing ultra-wideband characteristics;

[0086] Furthermore, the microstrip feeder conductor is arranged on the front of the dielectric plate. The microstrip feeder conductor is also a rectangular structure and is located below and to the left of the monopole antenna plate, respectively, to easily achieve impedance matching.

[0087] Furthermore, the ultra-wideband polarization reconfigurable anti-interference antenna provided by the present invention has a width and height of only 2 cm, a printed plane area of ​​only 4 square centimeters, and a very compact structure. Performance tests have shown that it can cover the ultra-wideband (3.1-10.6 GHz) communication frequency band.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An ultra-wideband polarization reconfigurable anti-interference antenna, characterized in that: The antenna comprises a dielectric substrate, a printed monopole antenna board, a radio frequency switch, a metal floor and a microstrip feeder conductor strip; The printed monopole antenna board includes a first step structure, a second step structure, and a third step structure; the first step structure includes a first step, a second step, a third step, and a fourth step, and the first step structure is a horizontal step structure on the monopole antenna board; the second step structure includes a fifth step, a sixth step, a seventh step, and an eighth step, and the second step structure is a vertical step structure on the monopole antenna board; the third step structure includes a ninth step, a tenth step, an eleventh step, and a twelfth step, and the third step structure is a step structure shared by the horizontal and vertical directions on the monopole antenna board; The microstrip feed line conductive strip includes a first microstrip feed conductive strip and a second microstrip feed conductive strip, wherein the first microstrip feed conductive strip is a horizontal microstrip feed conductive strip, and the second microstrip feed conductive strip is a vertical microstrip feed conductive strip; a first slot is provided on the first microstrip feed conductive strip, and a second slot is provided on the second microstrip feed conductive strip; The printed monopole antenna board further includes a first U-shaped slot structure and a second U-shaped slot structure, wherein the first U-shaped slot structure is a horizontal slot structure, and the U-shaped opening of the first U-shaped slot structure faces the first microstrip feed conductive strip; the second U-shaped slot structure is a vertical slot structure, and the U-shaped opening of the second U-shaped slot structure faces the second microstrip feed conductive strip; The RF switch includes a first switch, a second switch, a third switch, and a fourth switch, wherein the first switch is arranged on the first slot, the second switch is arranged on the second slot, the third switch is arranged on the first U-shaped slot structure, and the fourth switch is arranged on the second U-shaped slot structure; The first switch and the second switch are used to control the on and off of the transmission current on the first microstrip feed conductive strip and the second microstrip feed conductive strip to form a polarization reconfigurable characteristic of the antenna; the third switch and the fourth switch are used to control the on and off of the band-stop performance generated by the first U-shaped slot structure and the second U-shaped slot structure to form a frequency reconfigurable anti-interference characteristic of the antenna; The first step structure, the second step structure and the third step structure are respectively distributed in a right-angled sawtooth shape; the side where the first step is located intersects with the side where the fifth step is located, and the two sides intersect at 90 degrees to form a corner of a rectangle; The metal floor includes a first floor structure, a second floor structure, and a third floor structure. The first floor structure is a vertical floor structure, the second floor structure is a horizontal floor structure, and the third floor structure is an L-shaped common floor structure.

2. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The first step structure and the third step structure are based on the first microstrip feeding conductive strip, and the first step, the second step, the third step and the fourth step are symmetrical with the ninth step, the tenth step, the eleventh step and the twelfth step respectively; the second step structure and the third step structure are based on the second microstrip feeding conductive strip, and the ninth step, the tenth step, the eleventh step and the twelfth step are symmetrical with the fifth step, the sixth step, the seventh step and the eighth step respectively.

3. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The height of the first step is 1 mm; the width of the second step is 1.4 mm and the height is 1.3 mm; the width of the third step is 1.3 mm and the height is 1.4 mm; the width of the fourth step is 1 mm and the height is 0.7 mm.

4. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The projection distance between the first step and the metal floor is 0.04-0.2 times the bottom width of the metal floor; the metal floor is arranged on the reverse side of the dielectric substrate, the width of the third floor structure is 0.3-0.5 times the longest working wavelength, the height of the metal floor is 0.1-0.4 times the width of the metal floor, and the sum of the height of the metal floor and the height of the printed monopole antenna board is 0.4-0.6 times the longest working wavelength.

5. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The rectangular grooves in the horizontal direction of the bottom edge and the vertical direction of the side edge of the third floor structure are used for in-band matching with the printed monopole antenna board; the two rectangular grooves have the same size and shape and are placed on the lower side of the first microstrip feed conductive strip and on the left side of the second microstrip feed conductive strip.

6. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 5, characterized in that: The width of the two rectangular slots is 1.2-1.8 times the width of the first microstrip feed strip or the second microstrip feed strip, the height of the two rectangular slots is 0.4-0.9 times the height of the first floor structure or the second floor structure, the width of the two rectangular slots is 0.3-0.5 times the longest operating wavelength, and the height of the two rectangular slots is 0.1-0.4 times the width of the metal floor.

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