Ultra-wideband polarized reconfigurable anti-interference antenna

Abstract

The invention provides an ultra-wideband polarized reconfigurable anti-interference antenna, which comprises a dielectric substrate, a printed monopole antenna plate, a radio frequency switch, a metal floor and a microstrip feeder conduction band, and is characterized in that the printed monopole antenna plate comprises a first step structure, a second step structure and a third step structure; the micro-strip feeder conduction band comprises a first micro-strip feeder conduction band and a second micro-strip feeder conduction band; the first microstrip feed conduction band and the second microstrip feed conduction band are provided with a first gap and a second gap. The printed monopole antenna plate further comprises a first U-shaped slot structure and a second U-shaped slot structure, and U-shaped openings of the first U-shaped slot structure and the second U-shaped slot structure face the first microstrip feed conduction band and the second microstrip feed conduction band. The radio frequency switch comprises a first switch, a second switch, a third switch and a fourth switch, the first switch and the second switch are arranged on the first gap and the second gap, and the third switch and the fourth switch are arranged on the first U-shaped gap structure and the second U-shaped gap structure. According to the ultra-wideband polarized reconfigurable anti-interference antenna provided by the invention, the U-shaped gaps which are perpendicular to each other and overlapped with each other are additionally arranged on the antenna radiation unit, so that the performance of a band elimination filter is improved.

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) technology is a carrier-free communication technology that uses non-sinusoidal narrow pulses in the nanosecond to microsecond range to transmit data. Therefore, it occupies a large spectrum range. Although wireless communication is used, its data transmission rate can reach more than several hundred megabits per second. UWB technology has the advantages of low system complexity, low power spectrum density of transmitted signals, insensitivity to channel fading, low interception capability, high positioning accuracy, and strong penetration capability. It is especially suitable for high-speed wireless access in dense multipath places such as indoors. Since 2019, due to the release of new products including the iPhone series and the development of digital key specifications by some well-known companies and institutions such as Apple and the Car Connectivity Consortium (CCC), ultra-wideband technology and corresponding systems have further received widespread attention and application in the science and technology community and the Internet of Things.

[0003] With the rapid development of mobile communications and the increase in the number of users, higher requirements are placed on the antennas of the transceiver terminals of mobile devices and wireless systems. The communication terminal uses two orthogonal polarization modes to transmit two signals respectively, which can save frequency band resources, increase channel capacity, reduce the negative effects of multipath fading, and maximize the received signal. However, the dual-polarization antennas with polarization diversity characteristics currently used mostly require two linear polarization antennas to be placed vertically, which occupies a large space. At the same time, with the explosive growth of IoT devices, the use of frequency bands is becoming more and more intensive. Since the ultra-wideband system occupies a wide bandwidth, it has to share the spectrum with existing narrowband standard WIFI and the like. These frequency bands may become potential sources of interference, resulting in the inability of the UWB system to work effectively in real time. In order to reduce the mutual interference between the UWB system and other narrowband systems and ensure the normal operation of each communication system, the next generation of UWB systems needs to adopt relevant anti-interference technologies. In order to suppress the potential interference between the ultra-wideband system and multiple different standard narrowband systems, it is usually necessary to introduce multiple band-stop filters in the ultra-wideband system. These band-stop filters need to use multiple ones to correspond to different frequencies and use multiple cascades to improve the anti-interference effect. 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, which increases the performance of the band-stop filter by adding mutually perpendicular and overlapping U-shaped gaps on the antenna radiation unit, thereby achieving anti-interference effect on the WIFI communication standard.

[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, the antenna comprising 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 common step structure in the horizontal and vertical directions on the monopole antenna board; The microstrip feed strip includes a first microstrip feed strip and a second microstrip feed strip, wherein 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 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 feeding 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 feeding conductive strip; The RF switch includes a first switch, a second switch, a third switch and a fourth switch, the first switch is arranged on the first gap, the second switch is arranged on the second gap, the third switch is arranged on the first U-shaped gap structure, and the fourth switch is arranged on the second U-shaped gap structure.

[0007] Preferably, the radio frequency switch comprises 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.

[0008] Preferably, the first switch and the second switch are used to control the on and off of the transmission current on the first microstrip feeding conductor and the second microstrip feeding conductor 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.

[0009] Preferably, 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.

[0010] Preferably, the metal floor comprises 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.

[0011] Preferably, the first step structure and the third step structure are based on the first microstrip feeding conductor 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 conductor 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.

[0012] 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.

[0013] 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.

[0014] 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 strip and on the left side of the second microstrip feed strip.

[0015] Preferably, the width of the two rectangular grooves 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 grooves is 0.4-0.9 times the height of the first floor structure or the second floor structure, the width of the two rectangular grooves is 0.3-0.5 times the longest working wavelength, and the height of the two rectangular grooves is 0.1-0.4 times the width of the metal floor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 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, wherein 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, 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 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 strip; by providing the first and second slots on the first and second microstrip feed strips, and adding the first and second U-shaped slot structures which are perpendicular to and overlap each other on the printed monopole antenna board, the antenna increases the performance of the band stop filter, and realizes the anti-interference effect of the WIFI communication standard; Furthermore, the antenna is made polarization switchable by means of a radio frequency switch, that is, by controlling the on and off of the loaded switch device or changing the feeding mode, the current distribution on the antenna surface is changed, and beams of different polarization modes are radiated under the condition that the operating frequency and the radiation direction remain unchanged. Since the polarization reconfigurable antenna can be switched between a variety of orthogonal polarization modes, the system antenna cost can be reduced while eliminating the adverse effects of signal fading caused by the multipath effect on the wireless communication system. The use of reconfigurable polarization diversity technology can also improve the spectrum utilization rate and further improve the capacity of the communication system. Further, the radio frequency switch includes a first switch, a second switch, a third switch and a fourth switch, 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, and an electrically controllable switch is loaded for each slot, and the current distribution on the surface of the antenna is changed by controlling the on / off state of the switch, thereby realizing the change of the antenna frequency characteristics, and realizing the ultra-wideband antenna to suppress the external interference source of WIFI interference signal of about 5.5GHz; Furthermore, by implementing polarization diversity characteristics on the antenna and making miniaturization improvements on this basis, the original two antennas are combined into one, so that a single antenna with a compact structure can achieve the polarization diversity performance of two separate antennas. Compared with a single-polarization antenna, the polarization diversity antenna has a stronger anti-interference ability, can reduce the impact of polarization mismatch and channel interference, and can meet the coverage of ultra-wideband standard frequency bands, meeting the process design requirements of miniaturization of today's mobile terminals; Furthermore, the multi-stage stepped polarization diversity antenna has a low profile, is composed of rectangular metal strips of different sizes, has a simple structure, is easy to implement in terms of process, and is easy to integrate with circuits; 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 the ultra-wideband characteristics; Furthermore, the microstrip feeder conductor is arranged on the front of the dielectric plate, and the microstrip feeder conductor is also a rectangular structure, and is respectively located below and on the left side of the monopole antenna plate, so that impedance matching can be easily achieved; 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

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, not all embodiments. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. In the attached drawings, the same reference numerals represent the same components.

[0018] Figure 1 A schematic structural diagram of an ultra-wideband antenna with polarization diversity provided by an embodiment of the present invention; Figure 2 A schematic diagram of a frequency-adjustable polarization-reconfigurable anti-interference ultra-wideband antenna monopole designed on the basis of an ultra-wideband antenna with polarization diversity provided by one embodiment of the present invention; Figure 3 A return loss curve diagram of an ultra-wideband antenna with polarization diversity provided by an embodiment of the present invention; 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 an embodiment of the present invention; Figure 5A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at a frequency of 6 GHz with vertical polarization provided by an embodiment of the present invention; 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 a frequency of 6 GHz provided by an embodiment of the present invention; 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 an embodiment of the present invention; 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; Fig. 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 a frequency of 10 GHz provided by an embodiment of the present invention; Fig.10 A schematic diagram of the H-plane radiation direction of a frequency-adjustable, polarization-reconfigurable anti-interference ultra-wideband antenna at a frequency of 10 GHz with vertical polarization provided by an embodiment of the present invention; Fig.11 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at a 6 GHz frequency point with horizontal polarization provided by an embodiment of the present invention; Fig.12 A schematic diagram of the H-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at a frequency of 6 GHz with horizontal polarization provided by an embodiment of the present invention; Fig.13 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at 8 GHz with horizontal polarization provided by an embodiment of the present invention; Fig.14 A schematic diagram of the H-plane radiation direction of a frequency-adjustable, polarization-reconfigurable anti-interference ultra-wideband antenna at a frequency of 8 GHz with horizontal polarization provided by an embodiment of the present invention; Fig.15 A schematic diagram of the E-plane radiation direction of a frequency-adjustable, polarization-reconfigurable, anti-interference ultra-wideband antenna at a frequency of 10 GHz with horizontal polarization provided by an embodiment of the present invention; Fig.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 a frequency of 10 GHz provided in one embodiment of the present invention.

[0019] Figure Number: 11- dielectric substrate; 111- first step; 112- second step; 113- third step; 114- fourth step; 121-fifth step; 122-sixth step; 123-seventh step; 124-eighth step; 131-9th step; 132-10th step; 133-11th step; 134-12th step; 211-first floor structure; 212-second floor structure; 213-third floor structure; 221-first defective structure; 222-second defective structure; 301-first microstrip feeding conductive strip; 302-second microstrip feeding conductive strip; 411-first gap; 412-second gap; 421-first U-shaped gap structure; 422-second U-shaped gap structure; 511 - first switch; 512 - second switch; 521 - third switch; 522 - fourth switch. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] The technical solution of the present application is described in detail with specific embodiments below. 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.

[0022] 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.

[0023] The technical problem to be solved by the present invention is to provide an ultra-wideband polarization reconfigurable anti-interference antenna, which increases the performance of the band-stop filter by adding mutually perpendicular and overlapping U-shaped gaps on the antenna radiation unit, thereby achieving anti-interference effect on the WIFI communication standard.

[0024] View 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.

[0025] 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 includes two radiation direction units, one for horizontal and one for vertical polarization. Both radiation direction units cover the ultra-wideband communication frequency band to achieve 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.

[0026] 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 common step structure in the horizontal and vertical directions on the monopole antenna board.

[0027] Specifically, the multi-step shape on the left side of the radiation direction unit with the vertical polarization direction is shared with the multi-step shape on the bottom side of the radiation direction unit with the horizontal polarization direction to reduce the occupied space of the traditional dual-polarization ultra-wideband antenna. The step height of the radiation direction unit with the vertical polarization direction corresponds to the step width of the radiation direction unit with the horizontal polarization direction, and the magnitude is equal. The heights of the fourth step and the eighth step are respectively higher than the heights of the first floor structure 211 and the second floor structure 212.

[0028] The microstrip feed strip includes a first microstrip feed strip 301 and a second microstrip feed strip 302, wherein 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.

[0029] 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 conductor 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 conductor 302.

[0030] 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 arranged on the first gap 411, the second switch 512 is arranged on the second gap 412, the third switch 521 is arranged on the first U-shaped gap structure 421, and the fourth switch 522 is arranged on the second U-shaped gap structure 422.

[0031] In a specific implementation, 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.

[0032] 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 feeding strip 301 and the second microstrip feeding 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.

[0033] 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.

[0034] Specifically, each side of the first step structure, the second step structure, and the third step structure has four steps, and the four steps are distributed in a right-angled sawtooth shape. The second floor structure 212 corresponding to the radiation direction unit with a vertical polarization direction is in a horizontal direction, and the corresponding second microstrip feeder line guide strip 302 is in a vertical direction. The unit with the vertical polarization direction has four steps on the left and right sides based on the vertical direction, and the step width increases gradually from bottom to top. The first floor structure 211 corresponding to the radiation direction unit with a horizontal polarization direction is in a vertical direction, and the corresponding first microstrip feeder line guide strip 301 is in a horizontal direction. The radiation direction unit with a horizontal polarization direction has four steps on the left and right sides based on the horizontal direction, and the step width increases gradually 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 rectangular corner. 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.

[0035] In a specific implementation, the metal floor includes a first floor structure 211, a second floor structure 212 and a third floor structure 213, wherein 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.

[0036] In a specific implementation, the first step structure and the third step structure are based on the first microstrip feeding 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 step structure and the third step structure are based on the second microstrip feeding 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.

[0037] 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 step shape and size parameters on the left and right sides of the radiation direction unit with horizontal polarization direction are the same as those of the radiation direction unit with vertical polarization direction.

[0038] 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 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.

[0039] In a specific implementation, the rectangular grooves in the horizontal direction of the bottom edge and the vertical direction of the side edge of the third floor structure 213 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 301 and the left side of the second microstrip feed conductive strip 302. Among them, the two rectangular grooves are defective ground structures in the present invention, which are used for in-band matching with the printed monopole antenna board to form ultra-wideband characteristics in the horizontal and vertical polarization directions, and the rectangular grooves of the first defective ground structure 221 in the vertical direction and the second defective ground structure 222 in the horizontal direction have the same size and shape.

[0040] In a specific implementation, the width of the two rectangular grooves 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 grooves 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 grooves is 0.3-0.5 times the longest working wavelength, and the height of the two rectangular grooves is 0.1-0.4 times the width of the metal floor.

[0041] Combined with reference Figure 3-Figure 4 , Figure 3 A return loss curve diagram of an ultra-wideband antenna with polarization diversity provided by an embodiment of the present invention, Figure 3 The vertical axis is return loss / dB, and the horizontal axis is frequency / GHz. Figure 3 It can be seen that the two 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 of the ultra-wideband (3.1-10.6 GHz) frequency band is less than -10dB, 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 an 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 the two polarization directions of the frequency-adjustable polarization reconfigurable anti-interference ultra-wideband antenna 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 antenna frequency characteristics are changed, thereby realizing the ultra-wideband antenna's suppression of external WIFI interference signals.

[0042] 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 frequency point 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 frequency point provided by an embodiment of the present invention; Fig. 9 , Fig.10 Schematic diagrams of the E-plane and H-plane radiation directions of the vertical polarization direction of the frequency-adjustable polarization-reconfigurable anti-interference ultra-wideband antenna at a frequency of 10 GHz provided by an embodiment of the present invention. Fig.11 , Fig.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 frequency point provided by an embodiment of the present invention; Fig.13 , Fig.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 frequency point provided by an embodiment of the present invention; Fig.15 , Fig.16 The 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 10 GHz are provided in one embodiment of the present invention. From the radiation patterns at 6 GHz, 8 GHz, and 10 GHz frequencies within the ultra-wideband frequency band, it can be seen that the directional patterns of the frequency-adjustable polarization reconfigurable anti-interference ultra-wideband antenna in the vertical polarization direction and the horizontal polarization direction on the E-plane are in a 90-degree relationship, and the frequency-adjustable polarization reconfigurable anti-interference ultra-wideband antenna has relatively good omnidirectionality on the H-plane in the vertical polarization direction and the horizontal polarization direction, achieving relatively obvious monopole radiation characteristics and meeting the requirements of reconfigurable polarization diversity in two directions.

[0043] In summary, an ultra-wideband polarization reconfigurable anti-interference antenna provided in an embodiment of the present application, wherein the microstrip feed strip includes a first microstrip feed strip and a second microstrip feed strip, wherein 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, wherein the first U-shaped slot structure is The slot structure is a horizontal slot structure, and the U-shaped opening of the first U-shaped slot structure faces the first microstrip feeding 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 feeding conductive strip; by arranging the first and second slots on the first and second microstrip feeding conductive strips, and adding the first and second U-shaped slot structures that are perpendicular to each other and overlap on the printed monopole antenna board, the antenna increases the performance of the band stop filter and realizes the anti-interference effect of the WIFI communication standard; Furthermore, the antenna is made polarization switchable by means of a radio frequency switch, that is, by controlling the on and off of the loaded switch device or changing the feeding mode, the current distribution on the antenna surface is changed, and beams of different polarization modes are radiated under the condition that the operating frequency and the radiation direction remain unchanged. Since the polarization reconfigurable antenna can be switched between a variety of orthogonal polarization modes, the system antenna cost can be reduced while eliminating the adverse effects of signal fading caused by the multipath effect on the wireless communication system. The use of reconfigurable polarization diversity technology can also improve the spectrum utilization rate and further improve the capacity of the communication system. Further, the radio frequency switch includes a first switch, a second switch, a third switch and a fourth switch, 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, and an electrically controllable switch is loaded for each slot, and the current distribution on the surface of the antenna is changed by controlling the on / off state of the switch, thereby realizing the change of the antenna frequency characteristics, and realizing the ultra-wideband antenna to suppress the external interference source of WIFI interference signal of about 5.5GHz; Furthermore, by implementing polarization diversity characteristics on the antenna and making miniaturization improvements on this basis, the original two antennas are combined into one, so that a single antenna with a compact structure can achieve the polarization diversity performance of two separate antennas. Compared with a single-polarization antenna, the polarization diversity antenna has a stronger anti-interference ability, can reduce the impact of polarization mismatch and channel interference, and can meet the coverage of ultra-wideband standard frequency bands, meeting the process design requirements of miniaturization of today's mobile terminals; Furthermore, the multi-stage stepped polarization diversity antenna has a low profile, is composed of rectangular metal strips of different sizes, has a simple structure, is easy to implement in terms of process, and is easy to integrate with circuits; 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 the ultra-wideband characteristics; Furthermore, the microstrip feeder conductor is arranged on the front of the dielectric plate, and the microstrip feeder conductor is also a rectangular structure, and is respectively located below and on the left side of the monopole antenna plate, so that impedance matching can be easily achieved; 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.

[0044] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate 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 common step structure in the horizontal and vertical directions on the monopole antenna board; The microstrip feed strip includes a first microstrip feed strip and a second microstrip feed strip, wherein 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 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 feeding 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 feeding conductive strip; The RF switch includes a first switch, a second switch, a third switch and a fourth switch, the first switch is arranged on the first gap, the second switch is arranged on the second gap, the third switch is arranged on the first U-shaped gap structure, and the fourth switch is arranged on the second U-shaped gap structure.

2. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The radio frequency switch comprises 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.

3. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The first switch and the second switch are used to control the on and off of the transmission current on the first microstrip feeding conductive strip and the second microstrip feeding conductive 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.

4. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: 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.

5. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 1, characterized in that: The metal floor comprises a first floor structure, a second floor structure and a third floor structure, wherein 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. The ultra-wideband polarization reconfigurable anti-interference antenna according to claim 9, characterized in that: The width of the two rectangular grooves 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 grooves is 0.4-0.9 times the height of the first floor structure or the second floor structure, the width of the two rectangular grooves is 0.3-0.5 times the longest working wavelength, and the height of the two rectangular grooves is 0.1-0.4 times the width of the metal floor.

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