CN115911890A - Dual-frequency dual-polarization magnetoelectric dipole antenna array for millimeter wave mobile phone terminal - Google Patents
Dual-frequency dual-polarization magnetoelectric dipole antenna array for millimeter wave mobile phone terminal Download PDFInfo
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Abstract
A dual-frequency dual-polarization magnetoelectric dipole antenna array for a millimeter wave mobile phone terminal belongs to the technical field of 5G millimeter wave wireless communication and antennas. The antenna is formed by arranging and combining antenna units, wherein each antenna unit comprises a horizontal square metal patch, a butterfly-shaped metal patch layer, a metal floor, a metalized blind hole, a feed structure and a medium filled in the structure, and the feed structure comprises a + 45-degree feed unit and a-45-degree feed unit. The antenna array is composed of four antenna units with the same structure and arranged at equal intervals and two quasi-magnetic current structures positioned on two sides, and four ports of the first antenna unit, the second antenna unit and four ports of the third antenna unit are distributed in a mirror image mode relative to the center of the array. The invention can realize compact antenna unit design by utilizing the structures of the metallized blind holes of the metal floor and the butterfly-shaped metal patch layer, and is suitable for a millimeter wave mobile phone antenna array taking a high-pass millimeter wave module as an example; the magnetic current-like structure 7 is utilized to realize a wide scanning angle; the coexistence of small size, double frequency, double polarization and wide scanning angle can be realized.
Description
Technical Field
The invention belongs to the technical field of 5G millimeter wave wireless communication and antennas, and relates to a dual-frequency dual-polarization magnetoelectric dipole antenna array for a millimeter wave mobile phone terminal.
Background
With the rapid increase of user demand in the mobile communication field, a wider bandwidth of the millimeter wave band is required to meet the user demand. At present, commercial frequency bands of millimeter wave communication at a mobile phone end are mainly n257 (26.5-29.5 GHz), n258 (24.25-27.5 GHz), n260 (37.0-40.0 GHz) and n261 (27.5-28.35 GHz), and the millimeter wave chip antenna is always the key for the design of a dual-polarization and multi-band coverage.
Due to the fact that propagation attenuation of electromagnetic waves in a millimeter wave frequency band is large, the main transmission mode of the electromagnetic waves is line-of-sight transmission, polarization mismatch and link loss are prone to occurring, and therefore a dual-polarization directional antenna needs to be designed, and the antenna is formed into an array to improve gain. In order to achieve multi-angle coverage of communication, the array antenna needs to have a wide beam scanning angle. Due to the upgrading of other hardware in the mobile phone system, the space of the antenna in the mobile phone is gradually reduced, and the design of the small-sized antenna becomes the research key point gradually.
The invention arranges two pairs of magnetoelectric dipole antennas along +/-45 degrees, uses orthogonal L-shaped feeders for coupling feed, and realizes a dual-frequency +/-45-degree dual-polarized small-size antenna unit by adding metallized blind holes at four corners of an antenna floor and bending a vertical magnetoelectric dipole structure. Finally, the antenna units form a 1 x 4 array, and magnetic current-like structures are added on two sides of the array, so that beam scanning of the array within at least +/-47 degrees in the whole frequency band is realized.
Disclosure of Invention
The invention provides a dual-frequency dual-polarization magnetoelectric dipole millimeter wave antenna array, which aims to solve the problem that a millimeter wave terminal antenna is difficult to realize miniaturization, dual polarization, broadband and wide scanning angle. The antenna is miniaturized by placing the metallized blind holes at four corners of the floor and bending the vertical magnetic dipoles. By adding the magnetic current-like structures at two sides of the 1 x 4 array, the wide scanning angle of the array is realized.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a dual-frequency dual-polarization magnetoelectric dipole antenna array for a millimeter wave mobile phone terminal is formed by arranging and combining a plurality of dual-frequency dual-polarization magnetoelectric dipole antenna units with the same structure, wherein each dual-frequency dual-polarization magnetoelectric dipole antenna unit mainly comprises a horizontal square metal patch 1, four butterfly metal patch layers 2 with the same structure, a metal floor 3, a metallized blind hole 4, a feed structure 5 and a medium 6 filled in the structure. Wherein the feed structure 5 comprises a +45 deg. feed element 5-1 and a-45 deg. feed element 5-2.
The horizontal square metal patch 1 is formed by combining four small square metal patches with the same structure, is positioned on the top layer of the antenna unit, and a gap (the size of the gap between the adjacent small patches is 0.35-0.55 mm) is reserved between the adjacent small patches to form an electric dipole; the four patches are sequentially numbered 1, 2, 3 and 4 clockwise. In order to avoid contact with the feed structure 5, a gap is etched inwards at the vertex angle (namely the feed position) of the four small patches close to the central position of the horizontal square metal patch 1 (the gap has the dimensions of 0.58-0.68 mm in length and 0.15-0.25 mm in width, wherein the length is along the diagonal direction of the patch); the horizontal part of the feed structure 5 arranged in a cross-hair shape is arranged between the two diagonal slots, the intersection of the + 45-degree feed units 5-1 and-45-degree feed units 5-2 is not contacted, and the end parts of the two feed units are arranged in the corresponding small patch slots and are not contacted with the edges of the slots.
The butterfly-shaped metal patch layer 2 is located between the horizontal square metal patch 1 and the bottom metal floor 3, and the four butterfly-shaped metal patch layers 2 are arranged below the four small metal patches of the horizontal square metal patch 1. Each butterfly-shaped metal patch layer 2 comprises an upper patch 2-1, a middle square patch 2-2 and a lower patch 2-3, and forms a magnetic dipole, and the butterfly-shaped metal patch layer is of an integrated structure and specifically comprises the following components:
the upper layer patch 2-1 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, and the corner direction is outward; in order to avoid contact with the feed structure 5, the upper layer at the corners is provided with notches. The upper layer patch 2-1 is vertically arranged below two edges of one small metal patch in the horizontal square metal patch 1, and the two small metal patches are in contact with each other, wherein the two edges of the small metal patch are adjacent to the etched gap.
The middle square patch 2-2 is attached and installed below the upper patch 2-1, and one vertex angle of the middle square patch 2-2 is superposed with the vertex angle of the corner of the upper patch 2-1.
The lower layer patch 2-3 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, the corner direction is inward, and the corner is superposed with the other vertex angle of the middle square patch 2-2. I.e. the two corners of the upper layer patch 2-1 and the lower layer patch 2-3 are located on the same diagonal of the middle square patch 2-2.
The horizontal square metal patch 1 and the four butterfly metal patch layers 2 with the same structure form a complementary source, the horizontal square metal patch 1 conducts radiation mainly at low frequency, the butterfly metal patch layers 2 conduct radiation mainly at high frequency, and the working frequency of low frequency and high frequency can be adjusted by adjusting the size of the horizontal metal patch 1 and the size of each part of the vertical butterfly metal patch 2.
The metal floor 3 is positioned at the bottom layer, the lower layer patches 2-3 of the butterfly metal patch layers 2 are arranged on the metal floor 3 in a fitting mode, after the four butterfly metal patch layers 2 are arranged, corners of the four upper layer patches 2-1 are close to the position of an axis of the antenna, and corners of the four lower layer patches 2-3 are far away from the position of the axis of the antenna. Two round holes are etched on the metal floor 3 to ensure that the horizontal section B of the vertical part 5-1-1 is not contacted with the ground, the round holes are arranged at the positions, close to the corners, of the lower layer patches 2-3 of any two adjacent butterfly-shaped metal patch layers 2, the circle centers of the two round holes are respectively superposed with the centers of the horizontal section B of the vertical part 5-1-1 and the horizontal section B of the vertical part 5-2-1, an external feed structure 8 is arranged below the round holes, and the external feed structure 8 is connected with the horizontal section B and used for inputting radio frequency signals. The four top corners of the metal floor 3 are respectively provided with three metallized blind holes 4, gaps are reserved between the top surfaces of the metallized blind holes 4 and the horizontal square metal patches 1 (the range of the gaps is 0.2-0.6 mm), the metallized blind holes 4 can play a role in prolonging the current of the metal floor 3, the equivalent ground size is increased, the impedance matching of the antenna unit can be improved by the capacitance effect between the metallized blind holes 4 and the horizontal metal patches 1, the resonance point of the antenna unit is shifted to the left, and the electrical size of the antenna is reduced.
The feed unit 5 is an L-shaped feed line structure, and comprises a + 45-degree feed unit 5-1 and a-45-degree feed unit 5-2, and the specific structure is as follows:
the + 45-degree feeding unit 5-1 comprises a vertical part 5-1-1 and a horizontal part 5-1-2, and is of an L-shaped structure. The horizontal part 5-1-2 is a horizontally arranged strip structure. The vertical part 5-1-1 is provided with three sections of bending structures downwards along one end of the horizontal part 5-1-2, namely the vertical part 5-1-1 is sequentially provided with a vertical section A, a horizontal section A, a vertical section B and a horizontal section B from top to bottom, wherein the height of the vertical section A is smaller than that of the upper patch 2-1, the horizontal section A is positioned above the middle square patch 2-2 and is not in contact with the middle square patch 2-2, the gap range between the horizontal section A and the middle square patch 2-2 is 0.03-0.1 mm, the height of the vertical section B is larger than that of the lower patch 2-3, the gap range between the vertical section B and the lower patch 2-3 is 0.03-0.1 mm, the center of the horizontal section B is overlapped with the center of the etched round hole of the metal floor 3, and the horizontal section B is connected with the external feed structure 8.
The 45 feeding element 5-2 comprises a vertical part 5-2-1, a horizontal part 5-2-2. The horizontal portion 5-2-2 is a horizontally arranged long bar structure, and the middle part thereof is bent downwards so as not to contact with the horizontal portion 5-1-2. The vertical part 5-2-1 and the vertical part 5-1-1 have the same structure and are arranged at the position of the other butterfly-shaped metal patch layer 2.
After arrangement, the butterfly-shaped metal patch layers 2 where the two feed units are located are adjacent; the vertical section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the upper patch 2-1 of the butterfly metal patch layer 2, the vertical section B of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section B of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the lower patch 2-3 of the butterfly metal patch 2-1, and the horizontal section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the horizontal section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1. The vertical parts 5-1-1 and 5-2-1 of the +45 degree feed units 5-1 and 5-2 of the-45 degree feed units respectively form two 50 ohm air microstrip lines with the butterfly metal patch layer 2. The horizontal part 5-1-2 of the + 45-degree feed unit 5-1 and the horizontal part 5-2-2 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1, the horizontal part 5-1-2 and the horizontal part 5-2-2 are inserted into a gap of the horizontal square metal patch 1 to realize capacitive coupling feed, and the inserted length can adjust the impedance matching of the antenna unit. The medium 6 is filled in a structural space formed by the horizontal square metal patch 1, the four butterfly metal patch layers 2 with the same structure, the metal floor 3, the metallized blind hole 4 and the feed structure 5, and is used for increasing the electrical length of the antenna. The relative dielectric constant of the array-filled medium 6 affects the operating frequency of the antenna and can be adjusted according to the requirements of the operating frequency band.
Further, as shown in fig. 6, the millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna array is composed of four dual-frequency dual-polarization magnetoelectric dipole antenna elements with the same structure and two quasi-magnetorheological structures 7, the four antenna elements are arranged in parallel at equal intervals, the two quasi-magnetorheological structures 7 are located on the left side and the right side of an antenna element assembly, ports 1, 3, 5 and 7 and ports 2, 4, 6 and 8 are respectively arranged at the + 45-degree feeding unit 5-1 and the-45-degree feeding unit 5-2 on each antenna element, and 8 ports are totally 8 ports, and the four ports on the first and second antenna elements and the four ports on the third and fourth antenna elements are distributed in a mirror image with respect to an array center (as shown in fig. 6, the ports 1, 2, 3 and 4 and the ports 5, 6, 7 and 8 are distributed in a mirror image with respect to the array center). The distance between the central points of the adjacent millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna units is L 7 ，L 7 The range of (A) is 0.4-0.5 mm; the distance between the magnetic current-like structure 7 and the adjacent antenna unit is L 8 ，L 8 The range of (A) is 0.1 to 0.4mm.
Furthermore, the magnetic current-like structure 7 is composed of a rectangular metal patch 7-1, a metalized via hole 7-2 and a metal floor 3, wherein the rectangular metal patch 7-1 is attached to a horizontal square metal patchThe sheet 1 is parallel and the metallized via 7-2 is parallel to the metallized blind via 4. The quasi-magnetic current structure 7 can form a slot in the xoy direction with the adjacent horizontal square metal patch 1 and the adjacent metallized blind hole 4, the array energy is radiated in the non-edge-emitting direction, and the beam width of the antenna unit and the scanning angle of the array are increased. By adjusting the distance L between the magnetic current-like structure 7 and the adjacent antenna unit 8 The beam width of the antenna elements on two sides can be adjusted, but the magnetic current-like structure 7 is too close to the adjacent antenna elements, so that the impedance matching condition of the antenna elements is changed.
The working process of the invention is as follows:
radio frequency signals are input through an external feed structure 8, the external feed structure 8 is connected with a horizontal section B of a vertical part 5-1-1 of a + 45-degree feed unit 5-1 and a horizontal section B of a vertical part 5-2-1 of a-45-degree feed unit 5-2, the signals are fed in from the horizontal section B, the signals are respectively input to the horizontal parts 5-2-1 and 5-2-2 of the feed units through two 50-ohm air microstrip lines which are respectively formed by a butterfly metal patch layer 2 and the vertical parts 5-1-1 and 5-2-1, the horizontal parts 5-2-1 and 5-2-2 of the feed units are inserted into a horizontal square metal patch 1 for capacitive coupling feed, the radio frequency signals enter an antenna unit through the capacitive coupling feed, the metallized blind holes 4 prolong the current of a metal ground 3 and form a capacitive effect with the horizontal square metal patch 1, and a medium 6 in the antenna adjusts the electrical length of the antenna.
The radiation of the horizontal square metal patch 1 as an electric dipole is dominant at low frequency, and the surface current is distributed at the edge of the patch, as shown in fig. 10 (a) and 10 (b), the currents in the +45 ° direction and the-45 ° direction are formed by the +45 ° feeding unit 5-1 and the-45 ° feeding unit 5-2, respectively;
the radiation of the butterfly-shaped metal patch layer 2 as a magnetic dipole is dominant at high frequencies, and magnetic currents in the-45 ° direction and the +45 ° direction are formed at the gap between the horizontal square metal patches 1 through the +45 ° feeding unit 5-1 and the-45 ° feeding unit 5-2, respectively, as shown in fig. 10 (c) and 10 (d). The current and the magnetic current are orthogonal, the phase center is the same, and the electric dipole and the magnetic dipole work as complementary sources.
The four antenna units are arranged in parallel at equal intervals, two quasi-magnetic current structures 7 are positioned at the left side and the right side of an antenna unit assembly, ports 1, 3, 5 and 7 and ports 2, 4, 6 and 8 are respectively arranged at + 45-degree feed units 5-1 and-45-degree feed units 5-2 arranged on each antenna unit, four ports on the first antenna unit and four ports on the third antenna unit are distributed in a mirror image mode relative to the center of the array, the quasi-magnetic current structures 7 can form a slot in the xoy direction with the adjacent horizontal square metal patches 1 and the metallized blind holes 4, radio frequency signals are fed into the antenna array through the external feed structures 8, and beam scanning of the array is controlled by changing the excitation phase of the fed radio frequency signals.
Compared with the prior art, the invention has the beneficial effects that:
(1) The magnetoelectric dipole antenna unit realizes compact antenna unit design by utilizing the structures of the metallized blind holes 4 at the four top corners of the metal floor 3 and the butterfly-shaped metal patch layer 2, and is suitable for a millimeter wave mobile phone antenna array taking a high-pass millimeter wave module as an example.
(2) The magnetoelectric dipole antenna array disclosed by the invention realizes a wide scanning angle by utilizing the quasi-magnetic current structure 7.
(3) The magnetoelectric dipole antenna array can realize the coexistence of small size, double frequency, double polarization and wide scanning angle.
Drawings
Fig. 1 is a schematic structural diagram of a dual-frequency dual-polarization magnetoelectric dipole antenna unit proposed by the present invention;
fig. 2 is a schematic structural diagram of an electric dipole in a dual-band dual-polarized magnetoelectric dipole antenna unit according to the present invention;
fig. 3 is a schematic structural diagram of a magnetic dipole in a dual-frequency dual-polarization magnetoelectric dipole antenna unit according to the present invention;
fig. 4 is a schematic structural diagram of a feed unit in a dual-frequency dual-polarization magnetoelectric dipole antenna unit according to the present invention;
fig. 5 is a schematic structural diagram of a metal ground layer in a dual-frequency dual-polarization magnetoelectric dipole antenna unit according to the present invention;
fig. 6 is a schematic structural diagram of a dual-frequency dual-polarized magnetoelectric dipole 1 × 4 antenna array proposed by the present invention;
fig. 7 is a schematic structural diagram of a quasi-magnetic flow structure 14 in a dual-frequency dual-polarized magnetoelectric dipole 1 × 4 antenna array proposed by the present invention;
fig. 8 is an S parameter of a dual-frequency dual-polarization magnetoelectric dipole antenna unit proposed by the present invention;
fig. 9 is a two-dimensional radiation pattern of a dual-frequency dual-polarization magnetoelectric dipole antenna element proposed by the present invention; fig. 9 (a) is the radiation patterns of the dual-frequency dual-polarization magnetoelectric dipole antenna unit at the E plane and the H plane of 26.5 GHz; fig. 9 (b) is the radiation patterns of the dual-frequency dual-polarization magnetoelectric dipole antenna unit at the E plane and the H plane of 41 GHz;
fig. 10 (a) is the current distribution of the dual-frequency dual-polarized magnetoelectric dipole antenna element fed by the +45 ° feeding element 5-1 at 26.5GHz according to the present invention;
fig. 10 (b) is the current distribution of the dual-frequency dual-polarized magnetoelectric dipole antenna element fed by the-45 ° feeding element 5-2 at 26.5GHz according to the present invention;
fig. 10 (c) shows the magnetic current distribution of the dual-frequency dual-polarized magnetic-electric dipole antenna unit fed by the +45 ° feeding unit 5-1 at 41 GHz;
fig. 10 (d) shows the magnetic current distribution of the dual-frequency dual-polarization magnetoelectric dipole antenna unit fed by the-45 ° feeding unit 5-2 at 41 GHz;
fig. 11 is an S parameter applied to a dual-frequency dual-polarized magnetoelectric dipole 1 × 4 antenna array in the present invention;
fig. 12 (a) - (d) are beam scanning angles at 26.5GHz, 37GHz, 41GHz and 43GHz applied to a dual-frequency dual-polarized magnetoelectric dipole 1 × 4 antenna array in the present invention;
in the figure: 1, horizontal square metal patches; 2, a butterfly-shaped metal patch layer; 3, a metal floor; 4, metalizing the blind holes; 5 a feed structure; 6 medium; a class 7 magnetic flow structure; 8 an external feed structure;
2-1 upper layer patch, 2-2 middle square patch and 2-3 lower layer patch;
5-1+45 degree feeding unit; 5-1-1 vertical portion; 5-1-2 horizontal portion;
5-2-45 degree feeding unit; 5-2-1 vertical component; 5-2-2 horizontal portion;
7-1 rectangular metal patches, 7-2 metallized vias.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and the technical solutions.
A millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna array for a mobile terminal is formed by arranging and combining a plurality of dual-frequency dual-polarization magnetoelectric dipole antenna units with the same structure, wherein each dual-frequency dual-polarization magnetoelectric dipole antenna unit mainly comprises a horizontal square metal patch 1, four butterfly metal patch layers 2 with the same structure, a metal floor 3, a metallized blind hole 4, a feed structure 5 and a medium 6 filled in the structure. Wherein the feed structure 5 comprises a +45 deg. feed element 5-1 and a-45 deg. feed element 5-2.
The horizontal square metal patch 1 is formed by combining four small square metal patches with the same structure, is positioned on the top layer of the antenna unit, and a gap is reserved between every two adjacent small patches to form an electric dipole; the four patches are sequentially numbered 1, 2, 3 and 4 clockwise. In order to avoid contact with the feed structure 5, a gap is etched inwards at the vertex angle of the four small patches close to the central position of the horizontal square metal patch 1 (namely the feed position); the horizontal part of the feed structure 5 arranged in a cross-hair shape is arranged between the two diagonal slots, the intersection of the + 45-degree feed units 5-1 and-45-degree feed units 5-2 is not contacted, and the end parts of the two feed units are arranged in the corresponding small patch slots and are not contacted with the edges of the slots.
The butterfly-shaped metal patch layer 2 is located between the horizontal square metal patch 1 and the bottom metal floor 3, and the four butterfly-shaped metal patch layers 2 are arranged below the four small metal patches of the horizontal square metal patch 1. Each butterfly-shaped metal patch layer 2 comprises an upper patch 2-1, a middle square patch 2-2 and a lower patch 2-3, and forms a magnetic dipole, and the butterfly-shaped metal patch layer is of an integrated structure and specifically comprises the following components: the upper layer patch 2-1 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, and the corner direction is outward; in order to avoid contact with the feed structure 5, the upper layer at the corners is provided with notches. The upper layer patch 2-1 is vertically arranged below two edges of one small metal patch in the horizontal square metal patch 1, and the two small metal patches are in contact with each other, wherein the two edges of the small metal patch are adjacent to the etched gap. The middle square patch 2-2 is attached and installed below the upper patch 2-1, and one vertex angle of the middle square patch 2-2 is coincided with the vertex angle of the corner of the upper patch 2-1. The lower layer patch 2-3 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, the corner direction is inward, and the corner is superposed with the other vertex angle of the middle square patch 2-2. I.e. the two corners of the upper layer patch 2-1 and the lower layer patch 2-3 are located on the same diagonal of the middle square patch 2-2.
The horizontal square metal patch 1 and the four butterfly metal patch layers 2 with the same structure form a complementary source, the horizontal square metal patch 1 conducts radiation mainly at low frequency, the butterfly metal patch layers 2 conduct radiation mainly at high frequency, and the working frequency of low frequency and high frequency can be adjusted by adjusting the size of the horizontal metal patch 1 and the size of each part of the vertical butterfly metal patch 2.
The metal floor 3 is positioned at the bottom layer, the lower layer patches 2-3 of the butterfly metal patch layers 2 are arranged on the metal floor 3 in a fitting mode, after the four butterfly metal patch layers 2 are arranged, corners of the four upper layer patches 2-1 are close to the position of an axis of the antenna, and corners of the four lower layer patches 2-3 are far away from the position of the axis of the antenna. Two round holes are etched in the metal floor 3 to ensure that the horizontal section B of the vertical part 5-1-1 is not contacted with the ground, the round holes are arranged at the positions, close to the corner positions, of the lower layer patches 2-3 of any two adjacent butterfly-shaped metal patch layers 2, the circle centers of the two round holes are respectively superposed with the centers of the horizontal section B of the vertical part 5-1-1 and the horizontal section B of the vertical part 5-2-1, an external feed structure 8 is arranged below the round holes, and the external feed structure 8 is connected with the horizontal section B and used for inputting radio frequency signals. Four apex angles departments of metal floor 3 respectively are equipped with three metallization blind hole 4, and leave the clearance between the top surface of metallization blind hole 4 and the square metal paster 1 of level, and metallization blind hole 4 can play the effect of the electric current of extension metal floor 3, increases equivalent ground size, and the electric capacity effect between metallization blind hole 4 and the square metal paster 1 of level can improve the impedance matching of antenna element to shift left antenna element's resonance point, reduce antenna electricity size.
The feed unit 5 is an L-shaped feed line structure, and comprises a + 45-degree feed unit 5-1 and a-45-degree feed unit 5-2, and the specific structure is as follows: the +45 degree feeding unit 5-1 comprises a vertical part 5-1-1 and a horizontal part 5-1-2, and is of an L-shaped structure. The horizontal part 5-1-2 is a horizontally arranged strip structure. The vertical part 5-1-1 is provided with three bending structures downwards along one end of the horizontal part 5-1-2, namely the vertical part 5-1-1 is sequentially provided with a vertical section A, a horizontal section A, a vertical section B and a horizontal section B from top to bottom, wherein the height of the vertical section A is smaller than that of the upper layer patch 2-1, the horizontal section A is positioned above the middle square patch 2-2 and is not contacted with the middle square patch 2-2, the gap range between the horizontal section A and the middle square patch 2-2 is 0.03-0.1 mm, the height of the vertical section B is larger than that of the lower layer patch 2-3, the gap range between the vertical section B and the lower layer patch 2-3 is 0.03-0.1 mm, the center of the horizontal section B is overlapped with the center of an etched round hole of the metal floor 3, and the horizontal section B is connected with an external feed structure 8. The 45 feeding element 5-2 comprises a vertical part 5-2-1, a horizontal part 5-2-2. The horizontal portion 5-2-2 is a horizontally arranged long bar structure, and the middle part thereof is bent downwards so as not to contact with the horizontal portion 5-1-2. The vertical part 5-2-1 and the vertical part 5-1-1 have the same structure and are arranged at the position of the other butterfly-shaped metal patch layer 2.
After arrangement, the butterfly-shaped metal patch layers 2 where the two feed units are located are adjacent; the vertical section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the upper patch 2-1 of the butterfly metal patch layer 2, the vertical section B of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section B of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the lower patch 2-3 of the butterfly metal patch 2-1, and the horizontal section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the horizontal section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1. The vertical parts 5-1-1 and 5-2-1 of the +45 degree feed units 5-1 and 5-2 of the-45 degree feed units respectively form two 50-ohm air microstrip lines with the butterfly-shaped metal patch layer 2. The horizontal part 5-1-2 of the + 45-degree feed unit 5-1 and the horizontal part 5-2-2 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1, the horizontal part 5-1-2 and the horizontal part 5-2-2 are inserted into a gap of the horizontal square metal patch 1, capacitive coupling feeding is achieved, and the inserted length can adjust impedance matching of the antenna unit. The medium 6 is filled in a structural space formed by the horizontal square metal patch 1, the four butterfly metal patch layers 2 with the same structure, the metal floor 3, the metallized blind holes 4 and the feed structure 5, and is used for increasing the electrical length of the antenna. The relative dielectric constant of the array-filled medium 6 affects the operating frequency of the antenna and can be adjusted according to the requirements of the operating frequency band.
The specific dimensions and structure are as follows (except for fig. 1, medium 6 is hidden):
referring to fig. 1, each dual-frequency dual-polarization magnetoelectric dipole antenna unit includes a horizontal square metal patch 1, four butterfly metal patch layers 2 with the same structure, a metal floor 3, a metallized blind hole 4, a feed structure 5 and a medium 6 filled in the above structures. Wherein the feed structure 5 comprises a +45 deg. feed element 5-1 and a-45 deg. feed element 5-2. The whole size of the dual-frequency dual-polarized magnetoelectric dipole antenna unit is 4mm multiplied by 1mm.
Referring to fig. 2, the horizontal square metal patch 1 is formed by combining four small square metal patches with the same structure, is located on the top layer of the antenna unit, and a 0.45mm gap is left between adjacent small patches to form an electric dipole; the four patches are sequentially numbered 1, 2, 3 and 4 along the clockwise direction, and the side length L of the small patch 1 Is 1.63mm. In order to avoid contact with the feed structure 5, a gap is etched inwards at the vertex angle (namely the feed position) of the four small patches close to the central position of the horizontal square metal patch 1, the length of the gap is 0.58mm, the width of the gap is 0.15mm, and the length is along the diagonal direction of the patches; the horizontal part of the feed structure 5 arranged in a cross-hair shape is arranged between the two diagonal slots, the intersection of the + 45-degree feed units 5-1 and-45-degree feed units 5-2 is not contacted, and the end parts of the two feed units are arranged in the corresponding small patch slots and are not contacted with the edges of the slots.
Referring to fig. 3, the butterfly-shaped metal patch layer 2 is located between the horizontal square metal patch 1 and the bottom metal floor 3, and the four butterfly-shaped metal patch layers 2 are arranged below the four small metal patches of the horizontal square metal patch 1. Each butterfly-shaped metal patch layer 2 comprises an upper patch 2-1, a middle square patch 2-2 and a lower patch 2-3, and forms a magnetic dipole, and the butterfly-shaped metal patch layer is of an integrated structure and specifically comprises the following components:
the upper layer patch 2-1 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, the corner direction is outward, and the length L of one side of the upper layer patch 2-1 2 Is 1.34mm and width W 1 Is 0.3mm; in order to avoid contact with the feed structure 5, the upper layer at the corner is provided with a notch, and the length of one side of the notch is 0.28mm, and the width of the notch is 0.1mm. The upper layer patch 2-1 is vertically arranged below two edges of one small metal patch in the horizontal square metal patch 1, and the two small metal patches are in contact with each other, wherein the two edges of the small metal patch are adjacent to the etched gap.
The middle square patch 2-2 is attached and arranged below the upper patch 2-1, and the side length L of the middle square patch 2-2 3 Is 0.5mm, and one vertex angle of the middle square patch 2-2 is superposed with the vertex angle at the corner of the upper patch 2-1.
The lower layer patch 2-3 is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, the corner direction is inward, the corner is superposed with the other vertex angle of the middle square patch 2-2, and the length L of the lower layer patch 2-3 4 Is 0.7mm, and has a width W 2 Is 0.5mm. I.e. the two corners of the upper layer patch 2-1 and the lower layer patch 2-3 are located on the same diagonal of the middle square patch 2-2.
The horizontal square metal patch 1 and the four butterfly metal patch layers 2 with the same structure form a complementary source, the horizontal square metal patch 1 conducts radiation mainly at low frequency, the butterfly metal patch layers 2 conduct radiation mainly at high frequency, and the working frequency of low frequency and high frequency can be adjusted by adjusting the size of the horizontal metal patch 1 and the size of each part of the vertical butterfly metal patch 2.
Referring to fig. 2, 3 and 4, the feeding unit 5 is an L-shaped feeding line structure, and includes a +45 ° feeding unit 5-1 and a-45 ° feeding unit 5-2, which are as follows:
the + 45-degree feeding unit 5-1 comprises a vertical part 5-1-1 and a horizontal part 5-1-2, and is of an L-shaped structure. The horizontal part 5-1-2 is a horizontal clothLong strip structure of length L 5 Is 1.36mm, width W 3 Is 0.09mm. The vertical part 5-1-1 is provided with three sections of bending structures downwards along one end of the horizontal part 5-1-2, namely the vertical part 5-1-1 is sequentially provided with a vertical section A, a horizontal section A, a vertical section B and a horizontal section B from top to bottom, wherein the vertical section A is 0.25mm long and gradually changed to 0.12mm wide, the horizontal section A is 0.455mm long and gradually changed to 0.15mm wide, the vertical section B is 0.75mm long and gradually changed to 0.18mm wide, the horizontal section B is square and 0.18mm long, the vertical section A and the horizontal section A are positioned above and not in contact with the middle square patch 2-2, the horizontal section A and the middle square patch 2-2 are in a gap range of 0.05mm, the vertical section B and the lower patch 2-3 are in a gap range of 0.05mm, the center of the horizontal section B is overlapped with the center of the etched round hole of the metal floor 3, the horizontal section A and the horizontal section A are connected with an external feed structure 8, and the external feed structure is coaxially connected.
The 45 ° feeding unit 5-2 comprises a vertical part 5-2-1, a horizontal part 5-2-2. The horizontal part 5-2-2 is a horizontally arranged long strip structure with a length L 6 Is 1.29mm and width W 4 0.09mm, and the middle portion thereof is bent downward so as not to contact the horizontal portion 5-1-2, and the length of the bent portion is 0.3mm. The vertical part 5-2-1 and the vertical part 5-1-1 have the same structure and are arranged at the position of the other butterfly-shaped metal patch layer 2.
After arrangement, the butterfly-shaped metal patch layers 2 where the two feed units are located are adjacent; the vertical section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the upper patch 2-1 of the butterfly metal patch layer 2, the vertical section B of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the vertical section B of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the lower patch 2-3 of the butterfly metal patch 2-1, and the horizontal section A of the vertical part 5-1-1 of the + 45-degree feed unit 5-1 and the horizontal section A of the vertical part 5-2-1 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1. The vertical parts 5-1-1 and 5-2-1 of the +45 degree feed units 5-1 and 5-2 of the-45 degree feed units respectively form two 50-ohm air microstrip lines with the butterfly-shaped metal patch layer 2. The horizontal part 5-1-2 of the + 45-degree feed unit 5-1 and the horizontal part 5-2-2 of the-45-degree feed unit 5-2 are both parallel to the horizontal square metal patch 1, the horizontal part 5-1-2 and the horizontal part 5-2-2 are inserted into a gap of the horizontal square metal patch 1, capacitive coupling feeding is achieved, and the inserted length can adjust impedance matching of the antenna unit.
Referring to fig. 1 and 5, the metal floor 3 is located at the bottom layer, the lower layer patches 2-3 of the butterfly metal patch layers 2 are arranged on the metal floor 3 in an attaching manner, after the four butterfly metal patch layers 2 are arranged, corners of the four upper layer patches 2-1 are close to the position of the central axis of the antenna, and corners of the four lower layer patches 2-3 are far away from the position of the central axis of the antenna. Two round holes are etched on the metal floor 3, the radius of each round hole is 0.3mm, the horizontal section B of the vertical part 5-1-1 is ensured not to be contacted with the ground, the round holes are arranged at the positions, close to the corners, of the lower layer patches 2-3 of the two adjacent butterfly-shaped metal patch layers 2, the circle centers of the two round holes are respectively superposed with the centers of the horizontal section B of the vertical part 5-1-1 and the horizontal section B of the vertical part 5-2-1, an external feed structure 8 is arranged below each round hole, and the external feed structure 8 is connected with the horizontal section B and used for inputting radio frequency signals. Four apex angle departments of metal floor 3 respectively are equipped with three metallization blind hole 4, and leave 0.3 mm's clearance between the top surface of metallization blind hole 4 and the square metal paster 1 of level, the radius of metallization blind hole 4 is 0.15mm, the interval between adjacent metallization blind hole 4 central point is 0.46mm, metallization blind hole 4 can play the effect of the electric current of extension metal floor 3, increase equivalent ground size, the capacitive effect between metallization blind hole 4 and the square metal paster 1 of level can improve the impedance matching of antenna element, and shift the resonance point of antenna element to the left, reduce antenna electric size.
Referring to fig. 1, the medium 6 is filled in a structural space formed by a horizontal square metal patch 1, four butterfly-shaped metal patch layers 2 with the same structure, a metal floor 3, a metallized blind hole 4 and a feed structure 5, and is used for increasing the electrical length of the antenna. The medium 6 is made of TLY-5 with a relative dielectric constant of 2.2 and a loss tangent angle of 0.0009.
The dual-frequency dual-polarization magnetoelectric dipole antenna unit is fed through the coaxial connector, and the obtained S parameter is shown in fig. 8. The-10 dB working bandwidth of the antenna is 24.5-30.6GHz and 35.6-44.2GHz, the isolation is more than 15dB in the whole frequency band, and the broadband characteristic is realized in the low frequency band and the high frequency band.
Fig. 9 (a) - (b) show the E-plane and H-plane radiation patterns at 26.5GHz and 41GHz when the ports 1 and 2 of the dual-frequency dual-polarization magnetoelectric dipole antenna element proposed by the present invention are fed, including co-polarization and cross-polarization, with a gain greater than 5dBi and a cross-polarization ratio greater than 21dB in the broadside direction.
Fig. 7 is a schematic structural diagram of a dual-frequency dual-polarized magnetoelectric dipole 1 × 4 antenna array proposed by the present invention. The antenna array is composed of four dual-frequency dual-polarization magnetoelectric dipole antenna units with the same structure and two magnetic current-like structures 7, the four antenna units are arranged in parallel at equal intervals, the two magnetic current-like structures 7 are positioned on the left side and the right side of an antenna unit assembly, ports 1, 3, 5 and 7 and ports 2, 4, 6 and 8 are respectively arranged at positions of + 45-degree feeding units 5-1 and-45-degree feeding units 5-2 arranged on each antenna unit, 8 ports are totally formed, the four ports on the first second antenna unit and the four ports on the third fourth antenna unit are distributed in a mirror image mode relative to the center of the array, namely the ports 1, 2, 3 and 4 and the ports 5, 6, 7 and 8 are distributed in a mirror image mode relative to the center of the array respectively. Distance L between center points of adjacent millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna units 7 Is 0.4mm, the distance L between the magnetic current-like structure 7 and the adjacent antenna unit 8 0.29mm, the overall dimensions of the array are 4mm x 18mm x 1mm.
Referring to fig. 8, the magnetic current-like structure 7 is composed of a rectangular metal patch 7-1, a metalized via hole 7-2 and a metal floor 3, the rectangular metal patch 7-1 is parallel to the horizontal square metal patch 1, the metalized via hole 7-2 is parallel to the metalized blind hole 4, and the length L of the rectangular metal patch 7-1 is equal to the length L of the metalized via hole 7-2 9 Is 4mm, width W 5 Is 0.905mm. The quasi-magnetic current structure 7 can form a slot in the xoy direction with the adjacent horizontal square metal patch 1 and the adjacent metallized blind hole 4, the array energy is radiated in the non-edge-emitting direction, and the beam width of the antenna unit and the scanning angle of the array are increased.
Fig. 11 shows the result of S parameters of the dual-frequency dual-polarization magnetoelectric dipole antenna array provided by the present invention, the operating bandwidths of the antenna array are 25.4-29.4GHz and 35-44.5GHz, and the isolation between the ports is greater than 10dB.
Fig. 12 (a) - (d) show the scanning results of the dual-frequency dual-polarized magnetoelectric dipole antenna array proposed by the present invention at 26.5GHz, 37GHz, 41GHz, and 43GHz, and the 3dB scan angles thereof are-58 °, -62 °, -47 °, -54 °, respectively.
The above-mentioned embodiments only represent embodiments of the present invention, but should not be understood as limiting the scope of the present invention, it should be noted that those skilled in the art can make several variations and modifications without departing from the spirit of the present invention, and these all fall into the protection scope of the present invention.
Claims (7)
1. A dual-frequency dual-polarization magnetoelectric dipole antenna array for a millimeter-wave mobile phone terminal is characterized by being formed by arranging and combining a plurality of dual-frequency dual-polarization magnetoelectric dipole antenna units with the same structure, wherein each dual-frequency dual-polarization magnetoelectric dipole antenna unit comprises a horizontal square metal patch (1), four butterfly metal patch layers (2) with the same structure, a metal floor (3), a metallized blind hole (4), a feed structure (5) and a medium (6) filled in the structures; wherein the feed structure (5) comprises a +45 DEG feed unit (5-1) and a-45 DEG feed unit (5-2);
the horizontal square metal patch (1) is formed by combining four small square metal patches with the same structure, is positioned on the top layer of the antenna unit, and a gap is reserved between every two adjacent small patches to form an electric dipole; in order to avoid contact with the feeding structure (5), a gap is etched inwards at the feeding positions of the four small patches; the horizontal part of a feed structure (5) in a cross-flower arrangement is arranged between two opposite-angle gaps, the intersection parts of + 45-degree feed units (5-1) and-45-degree feed units (5-2) are not contacted, and the end parts of the two feed units are arranged in the corresponding small patch gaps and are not contacted with the edges of the gaps;
the four butterfly-shaped metal patch layers (2) are arranged below the four small metal patches of the horizontal square metal patch (1); each butterfly-shaped metal patch layer (2) comprises an upper patch (2-1), a middle square patch (2-2) and a lower patch (2-3), and forms a magnetic dipole, and the butterfly-shaped metal patch layer is of an integrated structure and specifically comprises the following components:
the upper layer patch (2-1) is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part; in order to avoid contact with the feed structure (5), the upper layer at the corner is provided with a notch; two sides of the upper layer patch (2-1) are arranged below two sides of the small metal patch adjacent to the gap;
the middle square patch (2-2) is horizontally arranged below the upper patch (2-1), and one vertex angle of the middle square patch (2-2) is superposed with the vertex angle of the corner of the upper patch (2-1);
the lower layer patch (2-3) is formed by horizontally bending a metal patch arranged along the vertical direction by 90 degrees along the middle part, and the corner is superposed with the other vertex angle of the middle square patch (2-2);
the horizontal square metal patch (1) and the four butterfly metal patch layers (2) with the same structure form a complementary source, the horizontal square metal patch (1) mainly radiates at a low frequency, the butterfly metal patch layers (2) mainly radiate at a high frequency, and the working frequency of the low frequency and the high frequency can be adjusted by adjusting the size of the horizontal metal patch (1) and the size of each part of the vertical butterfly metal patch;
the metal floor (3) is positioned at the bottom layer, after the four butterfly-shaped metal patch layers (2) are arranged, the corners of the four upper-layer patches (2-1) are close to the central axis position of the antenna, and the corners of the four lower-layer patches (2-3) are far away from the central axis position of the antenna; two round holes are etched in the metal floor (3) and used for ensuring that the horizontal section B of the vertical part (5-1-1) is not in contact with the ground, an external feed structure (8) is arranged below the round holes, and the external feed structure (8) is connected with the horizontal section B and used for inputting radio frequency signals; a plurality of metallized blind holes (4) are respectively arranged at four top corners of the metal floor (3), and gaps are reserved between the top surfaces of the metallized blind holes (4) and the horizontal square metal patches (1);
the feed unit (5) is of an L-shaped feed line structure and comprises a + 45-degree feed unit (5-1) and a-45-degree feed unit (5-2), and the structure is as follows:
the + 45-degree feed unit (5-1) comprises a vertical part (5-1-1), a horizontal part (5-1-2) and an L-shaped structure; the horizontal part (5-1-2) is a horizontally arranged long strip structure; the vertical part (5-1-1) is provided with three sections of bending structures downwards along one end of the horizontal part (5-1-2), namely the vertical part (5-1-1) sequentially comprises a vertical section A, a horizontal section A, a vertical section B and a horizontal section B from top to bottom, wherein the height of the vertical section A is smaller than that of the upper patch (2-1), the horizontal section A is positioned above the middle square patch (2-2) and is not in contact with the middle square patch, the height of the vertical section B is larger than that of the lower patch (2-3), the center of the horizontal section B is superposed with the center of an etching round hole of the metal floor (3), and the horizontal section B is connected with an external feed structure (8);
-the 45 ° feeding element (5-2) comprises a vertical section (5-2-1)), a horizontal section (5-2-2); the horizontal part (5-2-2) is a horizontally arranged long strip structure, and the middle part of the horizontal part is bent downwards so as not to be in contact with the horizontal part (5-1-2); the vertical part (5-2-1)) and the vertical part (5-1-1) have the same structure and are arranged at the position of another butterfly-shaped metal patch layer (2);
the medium (6) is filled in a structural space formed by the horizontal square metal patch (1), the four butterfly metal patch layers (2) with the same structure, the metal floor (3), the metallized blind hole (4) and the feed structure (5) and is used for increasing the electrical length of the antenna;
the millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna array is composed of four dual-frequency dual-polarization magnetoelectric dipole antenna units with the same structure and two quasi-magnetic current structures (7), the four antenna units are arranged in parallel at equal intervals, the two quasi-magnetic current structures (7) are positioned on the left side and the right side of an antenna unit assembly, ports are respectively arranged at the + 45-degree feeding unit (5-1) and the-45-degree feeding unit (5-2) on each antenna unit, the ports are totally 8, and the four ports on the first second antenna unit and the four ports on the third fourth antenna unit are distributed in a mirror image mode with respect to the center of the array.
2. The antenna array of claim 1, wherein the size of the gap between the adjacent small patches of the horizontal square metal patch (1) is 0.35-0.55 mm; the size of the etched gap at the feed position of each small patch is 0.58-0.68 mm in length and 0.15-0.25 mm in width, wherein the length is along the diagonal direction of the patch; the clearance between the top surface of the metallized blind hole (4) and the horizontal square metal patch (1) ranges from 0.2 mm to 0.6mm; in the + 45-degree feed unit (5-1), the gap between the horizontal section A and the middle square patch (2-2) ranges from 0.03 mm to 0.1mm, and the gap between the vertical section B and the lower patch (2-3) ranges from 0.03 mm to 0.1mm.
3. The dual-frequency dual-polarization magnetoelectric dipole antenna array for the millimeter wave mobile phone terminal according to claim 1, wherein two circular holes etched on the metal floor (3) are arranged at positions, close to corners, of lower-layer patches (2-3) of any two adjacent butterfly-shaped metal patch layers (2), and the centers of the two circular holes are respectively overlapped with the centers of a horizontal section B of a vertical section (5-1-1) and a horizontal section B of a vertical section (5-2-1)).
4. The dual-frequency dual-polarization magnetoelectric dipole antenna array for the millimeter wave mobile phone terminal according to claim 1, wherein after the feed units (5) are arranged, the butterfly-shaped metal patch layers (2) where the two feed units are located are adjacent; the vertical section A of the vertical part (5-1-1) of the + 45-degree feed unit (5-1) and the vertical section A of the vertical part (5-2-1)) of the-45-degree feed unit (5-2) are both parallel to the upper patch (2-1) of the butterfly metal patch layer (2), the vertical section B of the vertical part (5-1-1) of the + 45-degree feed unit (5-1) and the vertical section B of the vertical part (5-2-1)) of the-45-degree feed unit (5-2) are both parallel to the lower patch (2-3) of the butterfly metal patch (2-1), and the horizontal section A of the vertical part (5-1-1) of the + 45-degree feed unit (5-1) and the horizontal section A of the vertical part (5-2-1)) of the-45-degree feed unit (5-1) are both parallel to the horizontal square metal patch (1); the vertical part (5-1-1) of the + 45-degree feed unit (5-1) and the vertical part (5-2-1) of the-45-degree feed unit (5-2) respectively form two 50-ohm air microstrip lines with the butterfly-shaped metal patch layer (2); the horizontal part (5-1-2) of the + 45-degree feed unit (5-1) and the horizontal part (5-2-2) of the-45-degree feed unit (5-2) are both parallel to the horizontal square metal patch (1), the horizontal part (5-1-2) and the horizontal part (5-2-2) are inserted into a gap of the horizontal square metal patch (1), capacitive coupling feeding is achieved, and the inserted length can adjust impedance matching of the antenna unit.
5. According to claim 1The dual-frequency dual-polarization magnetoelectric dipole antenna array for the millimeter wave mobile phone terminal is characterized in that in the millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna array, the distance between the central points of adjacent millimeter wave dual-frequency dual-polarization magnetoelectric dipole antenna units is L 7 ，L 7 The range of (a) is 0.4-0.5 mm; the distance between the magnetic current-like structure (7) and the adjacent antenna unit is L 8 ，L 8 The range of (2) is 0.1 to 0.4mm.
6. The antenna array of the dual-frequency dual-polarization magnetoelectric dipole antenna for the millimeter wave mobile phone terminal according to claim 1, wherein the quasi-magnetic current structure (7) is composed of a rectangular metal patch (7-1), a metallized via hole (7-2) and a metal floor (3), wherein the rectangular metal patch (7-1) is parallel to the horizontal square metal patch (1), and the metallized via hole (7-2) is parallel to the metallized blind hole (4); the quasi-magnetic current structure (7) can form a slot in the xoy direction with the adjacent horizontal square metal patch (1) and the adjacent metallized blind hole (4), so that the array energy is radiated in the non-edge-emitting direction, and the beam width of the antenna unit and the scanning angle of the array are increased; by adjusting the distance L between the magnetic current-like structure (7) and the adjacent antenna unit 8 The beam width of the antenna elements on both sides can be adjusted.
7. The use process of the dual-frequency dual-polarized magnetoelectric dipole antenna array for the millimeter wave handset terminal according to any one of claims 1 to 6, characterized by comprising the following steps:
radio frequency signals are input through an external feeding structure (8), the external feeding structure (8) is connected with a horizontal section B of a vertical part (5-1-1) of a + 45-degree feeding unit (5-1) and a horizontal section B of a vertical part (5-2-1)) of a-45-degree feeding unit (5-2) and are fed from the horizontal section B, the signals are respectively input into the horizontal part (5-2-1)) and the horizontal part (5-2-2) of the feeding unit along a butterfly-shaped metal patch layer (2) and the vertical part (5-1-1) and the vertical part (5-2-1)) to form two 50-ohm air microstrip lines, the signals are respectively input into the horizontal part (5-2-1)) and the horizontal part (5-2-1)) of the feeding unit and are inserted into the horizontal square metal patch (1) to carry out capacitive coupling feeding, the radio frequency signals enter an antenna unit through capacitive coupling feeding, the metallized blind hole (4) prolongs the current of the metal ground (3) and forms a capacitive effect with the horizontal square metal patch (1), and a medium (6) in the antenna adjusts the electrical length of the antenna;
the radiation of a horizontal square metal patch (1) serving as an electric dipole is dominant at low frequency, surface current is distributed at the edge of the patch, and currents in the + 45-degree direction and the-45-degree direction are respectively formed through a + 45-degree feeding unit (5-1) and a-45-degree feeding unit (5-2);
the radiation of the butterfly-shaped metal patch layer (2) serving as a magnetic dipole is dominant at high frequency, and magnetic currents in a-45-degree direction and a + 45-degree direction are respectively formed at a gap between the horizontal square metal patches (1) through the + 45-degree feeding unit (5-1) and the-45-degree feeding unit (5-2); the current is orthogonal to the magnetic current, the phase centers are the same, and the electric dipole and the magnetic dipole work as complementary sources;
the quasi-magnetic current structure (7) and the adjacent horizontal square metal patch (1) and the metallized blind hole (4) form a slot in the xoy direction, a radio frequency signal is fed into the antenna array through an external feed structure (8), and the beam scanning of the array is controlled by changing the excitation phase of the fed radio frequency signal.
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| CN117543200B (en) * | 2024-01-09 | 2024-03-19 | 电子科技大学 | Three-dimensional integrated millimeter wave all-metal phased array packaging antenna |
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