CN117712684A - Polarization diversity high-isolation ultra-wideband antenna system with anti-interference function - Google Patents
Polarization diversity high-isolation ultra-wideband antenna system with anti-interference function Download PDFInfo
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- 239000000758 substrate Substances 0.000 claims abstract description 26
- 238000005530 etching Methods 0.000 claims abstract description 6
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Abstract
The invention provides a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function, which comprises a dielectric substrate, a first planar antenna and a second planar antenna, wherein the first planar antenna comprises a first printed monopole antenna plate, a first microstrip feeder conduction band and a first band-stop filter structure, and the second planar antenna comprises a second printed monopole antenna plate, a second microstrip feeder conduction band and a second band-stop filter structure; etching a bent first gap on a first metal floor by the first band-stop filter structure, wherein the first gap is symmetrical by taking a first microstrip feeder conduction band as a reference; and the second band-stop filter structure etches a U-shaped second slot on the second microstrip feeder conduction band, and the second slot is symmetrical with the second microstrip feeder conduction band as a reference. According to the polarization diversity high-isolation ultra-wideband antenna system provided by the invention, miniaturization of two antennas is performed in an inherent space, so that the space between the antennas is increased, and the space diversity capability of the antennas is effectively improved.
Description
Technical Field
The invention relates to the field of ultra-wideband antennas, in particular to a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function.
Background
Ultra Wideband (UWB) is suitable for a wide range of wireless systems where the transmitted signal may reflect and scatter multiple times from buildings, vehicles before reaching the receiver. Thus, the received signal is a combination of the original signal and the replicated wavefront. Such multipath propagation results in significant variations in the amplitude or waveform of the original signal. The quality and reliability of wireless communications are severely affected by multipath effects. Since communication channels are typically located in dense, open, and time-varying environments, achieving reliable and robust wireless communication is a significant challenge. To address this problem, diversity techniques in MIMO have been developed and employed to enhance the performance of wireless communications, particularly in dense environments. MIMO is a technique for wireless communication systems in which multiple antennas are used at the transmitter and/or receiver to enhance the quality of the received radio signals and/or to increase spectral efficiency. It can significantly improve data throughput and link range without increasing bandwidth or transmitter power. For ultra wideband communications, ultra wideband antennas with spatial and polarization diversity are desirable, with two vertically polarized antennas to improve the link quality between MIMO to reduce the effects of signal fading in multipath environments.
Meanwhile, with the rapid development of the mobile communication and the internet of things, the frequency band is used more and more densely. Because the ultra wideband system occupies an extremely wide bandwidth, it has to share the spectrum with existing narrowband systems. The development and application of various other frequency band wireless systems have led to the development of more and more tightening of existing frequency band resources, and the contradiction between the increasing functional demands and the limited spectrum resources has become more and more apparent, for example, fourth generation (4G) and fifth generation (5G) mobile communication standards, bluetooth, wiFi frequency bands, etc. in different operators, and the operating frequency bands of these systems have the problem of overlapping with ultra-wideband communication systems. In order to reduce the mutual interference of UWB systems with other such systems while ensuring proper operation of the respective communication systems, current UWB systems require the use of associated anti-interference techniques.
Therefore, it is desirable to provide a polarization diversity high isolation ultra wideband antenna system with anti-interference function, which can effectively solve the above problems.
Disclosure of Invention
The invention provides a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function, which is miniaturized by two antennas in an inherent space, so that the space between the antennas is increased, and the space diversity capability of the antennas is effectively improved.
The embodiment of the invention provides a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function, which comprises the following components:
a dielectric substrate, a first planar antenna and a second planar antenna, the first planar antenna comprising a first printed monopole antenna board, a first metal floor, a first microstrip feed line conduction band and a first band reject filter structure, the second planar antenna comprising a second printed monopole antenna board, a second metal floor, a second microstrip feed line conduction band and a second band reject filter structure, the first and second printed monopole antenna boards configured to radiate in the ultra wideband frequency band, the first printed monopole antenna board, the first microstrip feed line conduction band, the second printed monopole antenna board, the second microstrip feed line conduction band, the second band reject filter structure being disposed on a front side of the dielectric substrate, the first metal floor, the first band reject filter structure, the second metal floor being disposed on a back side of the dielectric substrate;
the first printed monopole antenna board is of an asymmetric fan-shaped structure; the second printed monopole antenna board is of a semicircular structure;
etching a bent first gap on the first metal floor by the first band-stop filter structure, wherein the first gap is symmetrical with the first microstrip feeder conduction band as a reference; and the second band-stop filter structure etches a U-shaped second gap on the second microstrip feeder conduction band, and the second gap is symmetrical by taking the second microstrip feeder conduction band as a reference.
Preferably, the first microstrip feed line conduction band and the second microstrip feed line conduction band are widened from one end to the other end from narrow to achieve impedance transformation.
Preferably, the first printed monopole antenna board is located on one side of the first microstrip feed line conduction band.
Preferably, the first metal floor is rectangular, and the height of the first metal floor is 0.8-1.2 times of the width of the first metal floor; the sum of the height of the first metal floor and the height of the first planar antenna is 0.4-0.6 times of the longest working wavelength; the width of the first metal floor is 1-1.5 times of the width of the first printed monopole antenna board, and the width of the first metal floor is 0.1-0.3 times of the longest working wavelength.
Preferably, the lengths of the first gap and the second gap are half of the wavelength of the corresponding needed anti-interference frequency band.
Preferably, the lengths of the first slit and the second slit in the horizontal bending direction are longer than those in the vertical bending direction, so as to ensure that the horizontal polarization characteristics of the first slit and the second slit are not disturbed.
Preferably, the second printed monopole antenna board is to the left of the second microstrip feed line conduction band.
Preferably, the second metal floor is in an isosceles trapezoid shape, and the height of the second metal floor is 0.2-0.5 times of the width of the lower bottom edge of the second metal floor; the sum of the height of the second metal floor and the height of the second planar antenna is 0.4-0.6 times of the longest working wavelength; the width of the second metal floor is 1-1.5 times of the width of the second printed monopole antenna board, and the width of the second metal floor is 0.3-0.6 times of the longest working wavelength.
Preferably, the first end of the first microstrip feed line conduction band and the first end of the second microstrip feed line conduction band are the same in width, and the second end of the second microstrip feed line conduction band is wider than the second end of the first microstrip feed line conduction band.
Preferably, the dielectric substrate has a dielectric constant of 2-10, a loss tangent of 10-3 or less, and a thickness of 3mm or less.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the polarization diversity high-isolation ultra-wideband antenna system with the anti-interference function comprises a dielectric substrate, a first planar antenna and a second planar antenna, wherein the first planar antenna comprises a first printed monopole antenna plate, a first metal floor, a first microstrip feed line conduction band and a first band-stop filter structure, the second planar antenna comprises a second printed monopole antenna plate, a second metal floor, a second microstrip feed line conduction band and a second band-stop filter structure, the first printed monopole antenna plate and the second printed monopole antenna plate are configured to radiate in an ultra-wideband band, the first printed monopole antenna plate, the first microstrip feed line conduction band, the second printed monopole antenna plate, the second microstrip feed line conduction band and the second band-stop filter structure are arranged on the front surface of the dielectric substrate, and the first metal floor, the first band-stop filter structure and the second metal floor are arranged on the back surface of the dielectric substrate; the first printed monopole antenna board is of an asymmetric fan-shaped structure; the second printed monopole antenna board is of a semicircular structure; etching a bent first gap on the first metal floor by the first band-stop filter structure, wherein the first gap is symmetrical with the first microstrip feeder conduction band as a reference; the second band-stop filter structure etches a U-shaped second slot on the second microstrip feeder conduction band, the second slot is symmetrical with the second microstrip feeder conduction band as a reference, the antenna system comprises two antennas, in order to realize space diversity, the two antennas need to have enough distance to ensure isolation and irrelevance of the two antennas, in order to realize polarization diversity, the polarization of the two antennas needs to be vertical at 90 degrees, and in the inherent space, miniaturization of the two antennas is performed, so that the space between the antennas is increased, and the space diversity capability of the antennas is effectively increased;
further, the first printed monopole antenna board is located at the upper right side of the conduction band of the first microstrip feeder, the original metal radiation patch part is located above the conduction band of the microstrip feeder, in order to reduce the space occupied by the antenna, the metal radiation patch at the upper left side of the conduction band of the first microstrip feeder is removed, only the metal radiation patch at the upper right side is reserved, the symmetrical metal radiation patch is replaced by an asymmetrical structure, the original size is halved by taking the microstrip feeder as an axis, and the space occupied by the first planar antenna in the horizontal direction is effectively reduced;
further, the second printed monopole antenna board is arranged at the left side of the second microstrip feeder conduction band, the original metal radiation patch part is in a circular shape, in order to reduce the space occupied by the antenna, the symmetry of the circular metal radiation patch is halved, the semicircular radiation patch at the left side is only reserved for the semicircular radiation patch at the right side, the original size is changed into a semicircle from a circle, the size is halved, and the space occupied by the second planar antenna in the horizontal direction is effectively reduced;
furthermore, two antennas in the antenna system can meet the requirement of covering ultra-wideband standard frequency bands, and meet the miniaturization process design requirement of the current mobile terminal;
furthermore, filtering functions are respectively added on the feed structures and the floors of the two antennas, so that the purposes of ultra-wideband antenna polarization and space diversity and anti-interference to the 802.11a WLAN are achieved;
furthermore, the polarization diversity high-isolation ultra-wideband antenna system with the anti-interference function has the advantages of low profile, simple structure, easy realization in process and easy integration with a circuit;
further, the metal floor is arranged on the back surface of the medium substrate, the printed monopole antenna board is arranged on the front surface of the medium substrate, and the metal floor and the printed monopole antenna effectively utilize the back surface and the front surface of the medium substrate respectively, so that ultra-wideband characteristics are better realized;
further, the two microstrip feeder conduction bands are arranged on the front face of the dielectric plate, and the microstrip feeder conduction bands are widened from one end to the other end from narrow, so that impedance matching is easy to achieve;
furthermore, the width and the height of the antenna system are only 6.4 cm and 2.4 cm respectively, the structure is very compact, and performance tests show that the antenna system can cover an ultra-wideband (3.1-10.6 GHz) communication frequency band and has the anti-interference characteristic.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the prior art, a brief description of the drawings is provided below, wherein it is apparent that the drawings in the following description are some, but not all, embodiments of the present invention. Other figures may be derived from these figures without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a front structure of a polarization diversity high isolation ultra wideband antenna system with anti-interference function according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a back structure of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function according to an embodiment of the present invention after a front side is vertically flipped;
fig. 3 is an S-parameter graph of a polarization diversity high isolation ultra wideband antenna system with anti-interference function according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an E-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a 3GHz frequency point according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an H-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a 3GHz frequency point according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an E-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a frequency point of 6GHz according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an H-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a frequency point of 6GHz according to an embodiment of the present invention;
fig. 8 is a schematic diagram of an E-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a 9GHz frequency point according to an embodiment of the present invention;
fig. 9 is a schematic diagram of an H-plane radiation direction of a left antenna of a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function vertically polarized at a 9GHz frequency point according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an E-plane radiation direction of a right antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function at a 3GHz frequency point according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an H-plane radiation direction of a right antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function in horizontal polarization at a 3GHz frequency point according to an embodiment of the present invention;
fig. 12 is a schematic diagram of an E-plane radiation direction of a right antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function at a frequency point of 6GHz according to an embodiment of the present invention;
fig. 13 is a schematic diagram of an H-plane radiation direction of a right antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function at a frequency point of 6GHz according to an embodiment of the present invention;
fig. 14 is a schematic diagram of an E-plane radiation direction of a right antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function at a frequency point of 9GHz according to an embodiment of the present invention;
fig. 15 is a schematic diagram of the H-plane radiation direction of the right antenna of the polarization diversity high isolation ultra wideband antenna system with the anti-interference function at the frequency point of 9GHz according to an embodiment of the present invention.
Reference numerals illustrate:
00-dielectric substrate;
11-a first planar antenna; 111-a first printed monopole antenna board; 112-a first metal floor; 113-a first microstrip feed line conduction band;
12-a second planar antenna; 121-a second printed monopole antenna board; 122-a second metal floor; 123-second microstrip feed line conduction band.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Based on the problems existing in the prior art, the embodiment of the invention provides a polarization diversity high-isolation ultra-wideband antenna system with an anti-interference function, and miniaturization of two antennas is performed in an inherent space, so that the space between the antennas is increased, and the space diversity capability of the antennas is effectively improved.
Fig. 1 is a schematic structural diagram of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function according to an embodiment of the present invention. Referring now to fig. 1 and 2, an embodiment of the present invention provides a polarization diversity high isolation ultra wideband antenna system with anti-interference function, comprising a dielectric substrate 00, a first planar antenna 11 and a second planar antenna 12, the first planar antenna 11 comprising a first printed monopole antenna plate 111, a first metal floor 112, a first microstrip feed line conduction band 113 and a first band reject filter structure, the second planar antenna 12 comprising a second printed monopole antenna plate 121, a second metal floor 122, a second microstrip feed line conduction band 123 and a second band reject filter structure, the first and second printed monopole antenna plates 121 being configured to radiate in an ultra wideband band, the first printed monopole antenna plate 111, the first feed line conduction band 113, the second printed monopole antenna plate 121, the second microstrip feed line conduction band 123, the second band reject filter structure being disposed on a front side of the dielectric substrate 00, the first metal floor 112, the first band reject filter structure, the second metal floor 122 being disposed on a back side of the dielectric substrate 00;
the first printed monopole antenna board 111 has an asymmetric fan-shaped structure; the second printed monopole antenna plate 121 has a semicircular structure;
etching a bent first gap on the first metal floor 112 by the first band-stop filter structure, wherein the first gap is symmetrical with the first microstrip feeder conduction band 113 as a reference; the second band-stop filter structure etches a second U-shaped slot on the second microstrip feed line conduction band 123, and the second slot is symmetrical with the second microstrip feed line conduction band 123 as a reference. In a specific implementation, the first microstrip feed line conduction band 113 and the second microstrip feed line conduction band 123 are widened from one end to the other end, so as to realize impedance transformation.
In an implementation, the first printed monopole antenna board 111 is located on one side of the first microstrip feed line conduction band 113. Originally, the metal radiation patch part is above the first microstrip feeder conduction band 113, in order to reduce the space occupied by the first planar antenna 11, the metal radiation patch at the upper left of the first microstrip feeder conduction band 113 is removed, only the metal radiation patch at the upper right is reserved, the symmetrical metal radiation patch is replaced by an asymmetrical structure, the original size is halved by taking the microstrip feeder as an axis, and the space occupied by the first planar antenna 11 in the horizontal direction is effectively reduced.
In a specific implementation, the first metal floor 112 is rectangular, and the height of the first metal floor 112 is 0.8-1.2 times of the width thereof; the sum of the height of the first metal floor 112 and the height of the first planar antenna 11 is 0.4-0.6 times the longest operating wavelength; the width of the first metal floor 112 is 1-1.5 times the width of the first printed monopole antenna board 111, and the width of the first metal floor 112 is 0.1-0.3 times the longest operating wavelength.
In a specific implementation, the lengths of the first slot and the second slot are half of the wavelength of the corresponding needed anti-interference frequency band.
Because the length of the corresponding half wavelength is larger, a structure of multiple bending is adopted to ensure that the floor is placed on a miniaturized floor. Since the polarization direction of the first planar antenna 11 is vertical polarization, the length of the slit in the vertical bending direction is longer than that in the horizontal bending direction, so as to ensure that the vertical polarization characteristic is not disturbed.
In a specific implementation, the lengths of the first slit and the second slit in the horizontal bending direction are larger than those of the first slit in the vertical bending direction, so that the horizontal polarization characteristics of the first slit and the second slit are not disturbed.
For the first slit, since the length of the corresponding half wavelength is large, a multi-bending structure is adopted to ensure placement on a miniaturized floor. Since the polarization direction of the first planar antenna 11 is vertical polarization, the length of the first slot in the vertical bending direction is longer than that in the horizontal bending direction, so as to ensure that the vertical polarization characteristic is not disturbed.
For the second slot, although the length of the half wavelength is larger, since the width of the second end of the second microstrip feed line conduction band 123 of the second planar antenna 12 is wider than the second end of the first microstrip feed line conduction band 113 of the first planar antenna 11, the slot bent once into a U shape may be etched thereon, forming a second band stop filter structure. Since the polarization direction of the second planar antenna 12 is horizontal polarization, the length of the second slot 125 in the horizontal bending direction is longer than that in the vertical bending direction, so as to ensure that the horizontal polarization characteristic is not disturbed.
In an implementation, the second printed monopole antenna board 121 is to the left of the second microstrip feed line conduction band 123. Originally, the metal radiation patch part is circular, in order to reduce the space that the second planar antenna 12 occupy, circular metal radiation patch symmetry reduces by half, and the semicircular radiation patch on left side only keeps the semicircular radiation patch on right side, and original size becomes semicircular by the circle, and the size reduces by half, and the space that the second planar antenna 12 occupy in the horizontal direction effectively reduces.
In a specific implementation, the second metal floor 122 is in an isosceles trapezoid shape, and the height of the second metal floor 122 is 0.2-0.5 times of the width of the lower bottom edge of the second metal floor; the sum of the height of the second metal floor 122 and the height of the second planar antenna 12 is 0.4-0.6 times the longest operating wavelength; the width of the second metal floor 122 is 1-1.5 times that of the second printed monopole antenna board 121, and the width of the second metal floor 122 is 0.3-0.6 times that of the longest operating wavelength.
In a specific implementation, the first end of the first microstrip feed line conduction band 113 and the first end of the second microstrip feed line conduction band 123 are the same in width, and the second end of the second microstrip feed line conduction band 123 is wider than the second end of the first microstrip feed line conduction band 113. Both the first microstrip feed line conduction band 113 and the second microstrip feed line conduction band 123 are matched to a 50 ohm SMA joint. Since the characteristic impedance of the first printed monopole antenna board 111 of the first planar antenna 11 is different from the characteristic impedance of the second printed monopole antenna board 121 of the second planar antenna 12, the second end of the second microstrip feed line conduction band 123 corresponding to the second planar antenna 12 is wider than the second end of the first microstrip feed line conduction band 113 corresponding to the first planar antenna 11.
In a specific implementation, the dielectric substrate 00 has a dielectric constant of 2-10, a loss tangent of 10-3 or less, and a thickness of 3mm or less.
Fig. 3 is a graph of return loss of a polarization diversity high isolation ultra wideband antenna system with anti-interference functionality provided by an embodiment of the present invention, the ordinate of fig. 3 being return loss/dB and the abscissa being frequency/GHz. As can be seen from fig. 3, the two antennas in the polarization diversity high isolation ultra wideband antenna system with the anti-interference function in the present embodiment form the band-stop characteristic near 5.5GHz, so that the interference to the 802.11a WLAN is effectively avoided. Besides the specially avoided frequency band, the two antennas can work on the 3-11GHz frequency band in the vertical and horizontal polarization directions, the return loss of the ultra-wideband (3.1-10.6 GHz) frequency band is less than-10 dB, and the whole ultra-wideband wireless standard frequency band can be covered. In order to ensure that the two port signals do not interfere with each other, it is necessary to ensure that the lower the coupling of the signals is, the better. As can be seen from FIG. 3, the isolation of the two ports is more than 30dB, and the isolation of the two ports can reach 60dB at about 5.5GHz, so that the practical application of antenna diversity can be completely satisfied.
Fig. 4 and fig. 5 are schematic diagrams of radiation directions of an E plane and an H plane of a vertical polarization direction of a left antenna of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided by an embodiment of the present invention at a 3GHz frequency point; fig. 6 and fig. 7 are schematic diagrams of radiation directions of an E plane and an H plane of a vertical polarization direction of a first planar antenna 11 of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided in an embodiment of the present invention at a 6GHz frequency point; fig. 8 and fig. 9 are schematic diagrams of radiation directions of an E plane and an H plane of a first planar antenna 11 of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided in an embodiment of the present invention, respectively, in a vertical polarization direction at a 9GHz frequency point. Fig. 10 and fig. 11 are schematic diagrams of radiation directions of an E plane and an H plane of a horizontal polarization direction of a second planar antenna 12 of the polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided in an embodiment of the present invention at a 3GHz frequency point; fig. 12 and fig. 13 are schematic diagrams of radiation directions of an E plane and an H plane of a horizontal polarization direction of a second planar antenna 12 of the polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided in an embodiment of the present invention at a 6GHz frequency point; fig. 14 and fig. 15 are schematic diagrams of radiation directions of an E plane and an H plane of a horizontal polarization direction of a first planar antenna 11 of a polarization diversity high isolation ultra wideband antenna system with an anti-interference function provided in an embodiment of the present invention at a 9GHz frequency point, respectively. In fig. 4-15, black is the main polarization pattern and gray is the cross polarization pattern. The radiation patterns on the 3GHz,6GHz and 9GHz frequency points in the ultra-wideband frequency band can be seen that the band-stop filter structures on the floor and the microstrip feed line guide band have no negative influence on the radiation characteristics in other bands, the left antenna of the polarization diversity high-isolation ultra-wideband antenna system with the anti-interference function has better omnidirectionality on the H surface in the vertical polarization direction and the horizontal polarization direction, the relatively obvious monopole radiation characteristics are realized, the requirements of polarization diversity in two directions are met, and the expected requirements are met. It can also be seen from the patterns that the main polarization average value at each angle is greater than 15dB relative to the cross polarization, ensuring good polarization purity.
In summary, the polarization diversity high isolation ultra wideband antenna system with the anti-interference function of the embodiment of the invention includes a dielectric substrate, a first planar antenna and a second planar antenna, where the first planar antenna includes a first printed monopole antenna board, a first metal floor, a first microstrip feed line conduction band and a first band-stop filter structure, the second planar antenna includes a second printed monopole antenna board, a second metal floor, a second microstrip feed line conduction band and a second band-stop filter structure, the first and second printed monopole antenna boards are configured to radiate in an ultra wideband communication band, the first printed monopole antenna board, the first microstrip feed line conduction band, the second printed monopole antenna board, the second microstrip feed line conduction band and the second band-stop filter structure are disposed on the front surface of the dielectric substrate, and the first metal floor, the first band-stop filter structure and the second metal feed line are disposed on the back surface of the dielectric substrate; the first printed monopole antenna board is of an asymmetric fan-shaped structure; the second printed monopole antenna board is of a semicircular structure; etching a bent first gap on the first metal floor by the first band-stop filter structure, wherein the first gap is symmetrical with the first microstrip feeder conduction band as a reference; the second band-stop filter structure etches a U-shaped second slot on the second microstrip feeder conduction band, the second slot is symmetrical with the second microstrip feeder conduction band as a reference, the antenna system comprises two antennas, in order to realize space diversity, the two antennas need to have enough distance to ensure isolation and irrelevance of the two antennas, in order to realize polarization diversity, the polarization of the two antennas needs to be vertical at 90 degrees, and in the inherent space, miniaturization of the two antennas is performed, so that the space between the antennas is increased, and the space diversity capability of the antennas is effectively increased;
further, the first printed monopole antenna board is located at one side of the first microstrip feeder conduction band, the original metal radiation patch part is located above the microstrip feeder conduction band, in order to reduce the space occupied by the antenna, the metal radiation patch at the upper left of the first microstrip feeder conduction band is removed, only the metal radiation patch at the upper right is reserved, the symmetrical metal radiation patch is replaced by an asymmetric structure, the original size is halved by taking the microstrip feeder as an axis, and the space occupied by the first planar antenna in the horizontal direction is effectively reduced;
further, the second printed monopole antenna board is arranged at the left side of the second microstrip feeder conduction band, the original metal radiation patch part is in a circular shape, in order to reduce the space occupied by the antenna, the symmetry of the circular metal radiation patch is halved, the semicircular radiation patch at the left side is only reserved for the semicircular radiation patch at the right side, the original size is changed into a semicircle from a circle, the size is halved, and the space occupied by the second planar antenna in the horizontal direction is effectively reduced;
furthermore, two antennas in the antenna system can meet the requirement of covering ultra-wideband standard frequency bands, and meet the miniaturization process design requirement of the current mobile terminal;
furthermore, filtering functions are respectively added on the feed structures and the floors of the two antennas, so that the purposes of ultra-wideband antenna polarization and space diversity and anti-interference to the 802.11a WLAN are achieved;
furthermore, the polarization diversity high-isolation ultra-wideband antenna system with the anti-interference function has the advantages of low profile, simple structure, easy realization in process and easy integration with a circuit;
further, the metal floor is arranged on the back surface of the medium substrate, the printed monopole antenna board is arranged on the front surface of the medium substrate, and the metal floor and the printed monopole antenna effectively utilize the back surface and the front surface of the medium substrate respectively, so that ultra-wideband characteristics are better realized;
further, the two microstrip feeder conduction bands are arranged on the front face of the dielectric plate, and the microstrip feeder conduction bands are widened from one end to the other end from narrow, so that impedance matching is easy to achieve;
furthermore, the width and the height of the antenna system are only 6.4 cm and 2.4 cm respectively, the structure is very compact, and performance tests show that the antenna system can cover an ultra-wideband (3.1-10.6 GHz) communication frequency band and has the anti-interference characteristic.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The utility model provides a polarization diversity high isolation ultra wide band antenna system of interference killing feature which characterized in that includes:
a dielectric substrate, a first planar antenna and a second planar antenna, the first planar antenna comprising a first printed monopole antenna board, a first metal floor, a first microstrip feed line conduction band and a first band reject filter structure, the second planar antenna comprising a second printed monopole antenna board, a second metal floor, a second microstrip feed line conduction band and a second band reject filter structure, the first and second printed monopole antenna boards configured to radiate in the ultra wideband frequency band, the first printed monopole antenna board, the first microstrip feed line conduction band, the second printed monopole antenna board, the second microstrip feed line conduction band, the second band reject filter structure being disposed on a front side of the dielectric substrate, the first metal floor, the first band reject filter structure, the second metal floor being disposed on a back side of the dielectric substrate;
the first printed monopole antenna board is of an asymmetric fan-shaped structure; the second printed monopole antenna board is of a semicircular structure;
etching a bent first gap on the first metal floor by the first band-stop filter structure, wherein the first gap is symmetrical with the first microstrip feeder conduction band as a reference; and the second band-stop filter structure etches a U-shaped second gap on the second microstrip feeder conduction band, and the second gap is symmetrical by taking the second microstrip feeder conduction band as a reference.
2. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein the first microstrip feed line conduction band and the second microstrip feed line conduction band widen from one end to the other end to achieve impedance transformation.
3. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein said first printed monopole antenna plate is located on one side of said first microstrip feed line conduction band.
4. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein said first metal floor is rectangular, said first metal floor height being 0.8-1.2 times its width; the sum of the height of the first metal floor and the height of the first planar antenna is 0.4-0.6 times of the longest working wavelength; the width of the first metal floor is 1-1.5 times of the width of the first printed monopole antenna board, and the width of the first metal floor is 0.1-0.3 times of the longest working wavelength.
5. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein the length of said first slot and second slot is half the wavelength of the corresponding desired anti-interference frequency band.
6. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein the first slot and the second slot have a length in the horizontal bending direction that is greater than a length in the vertical bending direction to ensure that no perturbation is made to their horizontal polarization characteristics.
7. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein said second printed monopole antenna plate is to the left of said second microstrip feed line conduction band.
8. The polarization diversity high isolation ultra wideband antenna system of anti-interference function according to claim 1, wherein said second metal floor has an isosceles trapezoid shape, the height of said second metal floor is 0.2-0.5 times the width of the lower bottom side thereof; the sum of the height of the second metal floor and the height of the second planar antenna is 0.4-0.6 times of the longest working wavelength; the width of the second metal floor is 1-1.5 times of the width of the second printed monopole antenna board, and the width of the second metal floor is 0.3-0.6 times of the longest working wavelength.
9. The polarization diversity high isolation ultra wideband antenna system of claim 1, wherein the first end of the first microstrip feed line conduction band and the first end of the second microstrip feed line conduction band are the same width, and the second end of the second microstrip feed line conduction band is wider than the second end of the first microstrip feed line conduction band.
10. The ultra wideband antenna system with high isolation and polarization diversity with anti-interference function as claimed in claim 1, wherein the dielectric substrate has a dielectric constant of 2-10 and a loss tangent of 10 or less -3 The thickness is less than or equal to 3mm.
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