Detailed Description
In order to explain technical contents, objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, an ultra-wideband dielectric resonator antenna module includes a dielectric substrate and at least one antenna unit, where the dielectric substrate includes a first surface and a second surface opposite to the first surface, the antenna unit includes a dielectric resonator, and the dielectric resonator is disposed on the first surface of the dielectric substrate; the dielectric resonator is in a triangular prism shape, the bottom surface of the triangular prism is an isosceles triangle, the height of the isosceles triangle is 0.36 lambda-0.4 lambda, the height of the dielectric resonator is 0.36 lambda-0.4 lambda, and lambda is the wavelength length; the dielectric resonator is a ceramic dielectric resonator.
From the above description, the beneficial effects of the present invention are: the coverage frequency range is wide; a plurality of frequency bands can be covered by one antenna module, and the utilization rate of the terminal space is improved.
Further, the vertex angle of the isosceles triangle is 30 degrees, and the height of the isosceles triangle is 4 mm; the height of the dielectric resonator is 4 mm.
Further, the dielectric resonator has a dielectric constant of 10.
As can be seen from the above description, the dielectric resonator is designed to have dimensions and dielectric constant such that it can excite multiple radiation modes, which are connected to form an ultra-wideband.
Furthermore, first through holes which penetrate through the dielectric substrate and correspond to the antenna units one by one are formed in the dielectric substrate; the antenna unit further comprises a feed structure including a feed probe and a feed line; the feed probe is arranged on the first surface of the dielectric substrate and is close to one side surface of the dielectric resonator, and the one side surface is a side surface corresponding to the bottom edge of the isosceles triangle; the feeder line is arranged on the second surface of the medium substrate; the feeding probe is connected with one end of the feeding line through the first via hole.
Further, the height of the feed probe is 1.7 mm.
As can be seen from the above description, the feeding is performed by means of a metal probe.
Furthermore, first through holes which penetrate through the dielectric substrate and correspond to the antenna units one by one are formed in the dielectric substrate; the antenna unit further comprises a feed structure comprising a metal layer and a feed line; the metal layer is arranged on one side surface of the dielectric resonator and is close to the first surface of the dielectric substrate, and the one side surface is a side surface corresponding to the bottom edge of the isosceles triangle; the feeder line is arranged on the second surface of the medium substrate; the metal layer is connected to one end of the feeder line through the first via.
Further, the metal layer is a copper plating layer or a silver plating layer; the thickness of the metal layer is less than 50 mu m, and the length of the metal layer is 1.65-1.75 mm.
As can be seen from the above description, the power feeding is realized by plating a metal layer on the dielectric body in consideration of the actual process.
The radio frequency chip, the digital chip and the power chip are arranged on the second surface of the medium substrate, the digital chip and the power chip are respectively connected with the radio frequency chip, and the radio frequency chip is respectively connected with the other ends of the feeder lines in the feeding structures of the antenna units.
As can be seen from the above description, the rf chip is used to provide signals for the antenna; the digital chip is used for controlling the amplitude and the phase of a signal of the radio frequency chip and is equivalent to a digital switch of circuits such as an amplifier, a low-noise amplifier and the like in the radio frequency chip; and the power supply chip is used for providing power supply for the radio frequency chip.
The dielectric substrate further comprises a first low-frequency line and a second low-frequency line, wherein the first low-frequency line and the second low-frequency line are arranged on the first surface of the dielectric substrate; a second through hole, a third through hole, a fourth through hole and a fifth through hole which penetrate through the dielectric substrate are formed in the dielectric substrate; one end of the first low-frequency line is connected with the radio frequency chip through the second via hole, and the other end of the first low-frequency line is connected with the digital chip through the third via hole; one end of the second low-frequency line is connected with the radio frequency chip through the fourth via hole, and the other end of the second low-frequency line is connected with the power chip through the fifth via hole.
As is apparent from the above description, by disposing the low-frequency line and the feeder line on both sides of the dielectric substrate, respectively, the low-frequency signal and the radio-frequency signal can be separated, preventing crosstalk.
The invention also provides electronic equipment comprising the ultra-wideband dielectric resonator antenna module.
Example one
Referring to fig. 1 to 9, a first embodiment of the present invention is: an ultra-wideband dielectric resonator antenna module is suitable for handheld equipment of a 5G millimeter wave communication system.
As shown in fig. 1, the antenna includes adielectric substrate 1 and at least one antenna element, and in this embodiment, four antenna elements are taken as an example for description, and the four antenna elements are linearly arranged.
Thedielectric substrate 1 comprises a first surface and a second surface which are opposite, the antenna unit comprises adielectric resonator 2, and thedielectric resonator 2 is arranged on the first surface of thedielectric substrate 1; thedielectric resonator 2 is in the shape of a triangular prism, the bottom surface of the triangular prism is an isosceles triangle, the height of the isosceles triangle is 0.36 lambda-0.4 lambda, the height of the dielectric resonator is 0.36 lambda-0.4 lambda, and lambda is the wavelength of the center frequency of resonance.
In the embodiment, the vertex angle of the isosceles triangle is 30 degrees, and the height of the isosceles triangle is 4 mm; the height of the dielectric resonator is 4 mm. The dielectric resonator has a dielectric constant of 10.
Preferably, the dielectric resonator is a ceramic dielectric resonator. The dielectric resonator antenna formed by the ceramic body is high in processing precision, small in size in a millimeter wave frequency band, low in cost and great in advantages compared with a PCB.
Furthermore, first via holes which penetrate through the dielectric substrate and correspond to the antenna units one to one are formed in the dielectric substrate. The antenna element further comprises a feed structure, which in other embodiments comprises a feed probe and a feed line; the feed probe is arranged on the first surface of the dielectric substrate and is close to one side surface of the dielectric resonator, and the one side surface is a side surface corresponding to the bottom edge of the isosceles triangle; the feeder line is arranged on the second surface of the medium substrate; the feeding probe is connected with one end of the feeding line through the first via hole. Preferably, the height of the feed probe is 1.7 mm.
In the embodiment, the antenna feed is replaced by plating copper or silver on the surface of the ceramic dielectric body in consideration of the process. That is, as shown in fig. 1 and 3 in combination, in the present embodiment, the feeding structure includes themetal layer 3 and the feeding line 4; themetal layer 3 is arranged on one side surface of thedielectric resonator 2, and the one side surface is a side surface corresponding to the bottom edge of the isosceles triangle; themetal layer 3 can be a strip shape, and the length direction is arranged along the height direction of thedielectric resonator 2; the lower end of themetal layer 3 is connected with a first viahole 11 on thedielectric substrate 1, and is connected with one end of a feeder line 4 arranged on the second surface of thedielectric substrate 1 through the first viahole 11.
Preferably, the metal layer is a copper plated layer or a silver plated layer. The thickness of the metal layer is less than 50 μm, and the length is 1.65-1.75mm, preferably 1.7 mm.
Preferably, the lower end of the metal layer may extend by a section and cover the first via hole to ensure connection reliability.
As shown in fig. 2, the antenna further includes aradio frequency chip 5, adigital chip 6 and apower chip 7, theradio frequency chip 5, thedigital chip 6 and thepower chip 7 are disposed on the second surface of thedielectric substrate 1, and theradio frequency chip 5 is connected to the other end of the feeder 4 of each antenna unit.
As shown in fig. 3, the dielectric substrate further includes a first low-frequency line 8 and a second low-frequency line 9, where the first low-frequency line 8 and the second low-frequency line 9 are disposed on the first surface of thedielectric substrate 1; a second throughhole 12, a third throughhole 13, a fourth throughhole 14 and a fifth throughhole 15 which penetrate through thedielectric substrate 1 are arranged in thedielectric substrate 1; one end of the first low-frequency line 8 is connected with theradio frequency chip 5 through the second viahole 12, and the other end of the first low-frequency line 8 is connected with thedigital chip 6 through the third viahole 13; one end of the second low-frequency line 9 is connected with theradio frequency chip 5 through the fourth viahole 14, and the other end of the second low-frequency line 9 is connected with thepower chip 7 through the fifth viahole 15. Namely, theradio frequency chip 5 is connected with thedigital chip 6 through a firstlow frequency line 8, and theradio frequency chip 5 is connected with thepower supply chip 7 through a second low frequency line 9.
If the low frequency line and the feeder line are disposed on the same surface of the dielectric substrate, crosstalk may occur between the low frequency signal and the radio frequency signal, and thus, by disposing the low frequency line and the feeder line on both surfaces of the dielectric substrate, respectively, the low frequency signal and the radio frequency signal may be separated, preventing crosstalk.
The radio frequency chip is used for providing signals for the antenna; the radio frequency chip comprises elements such as a phase shifter and an amplifier, wherein the phase shifter is used for providing phase difference among the antenna units to realize the beam scanning capability, and the amplifier is used for compensating the loss of the phase shifter. The digital chip is used for controlling a phase shifter and an amplifier of the radio frequency chip to achieve the function of antenna electric scanning. The power supply chip is used for providing power supply for the radio frequency chip.
The structural design of this embodiment can be based on 3 layers of PCB, easily processing, and it is simple to make, with low costs. Specifically, the dielectric substrate comprises a first dielectric layer, an antenna stratum and a second dielectric layer which are sequentially stacked; one surface of the first dielectric layer, which is far away from the antenna ground layer, is the first surface of the dielectric substrate, and the first surface is provided with a low-frequency circuit layer, namely a first low-frequency line and a second low-frequency line; and one surface of the second dielectric layer, which is far away from the antenna ground layer, is the second surface of the dielectric substrate, and the second surface is provided with an antenna feed network, namely a feed line.
Fig. 4 is a schematic diagram of S parameters of the ultra-wideband dielectric resonator antenna module of this embodiment, and it can be seen from the diagram that the antenna module of this embodiment covers n257(26.5-29.5GHz), n258(24.25-27.25GHz), n260(37-40GHz), and n261(27.5-28.35GHz), and the coverage frequency band is wide.
FIG. 5 is a schematic diagram of the antenna module of this embodiment, which shows that the TM is excitedZ101、TMX103 and TMZ113, and the radiation modes are connected to form an ultra-wideband. That is, the present embodiment realizes ultra-wideband by exciting a plurality of modes.
The patterns are named according to coordinate axes, namely X, Z in the pattern name refers to an X axis and a Z axis. Reference is made to fig. 6 for the coordinate axis direction of this embodiment, that is, an origin O of the coordinate axis is a central point of a bottom side of one side surface of the dielectric resonator, the one side surface is a side surface corresponding to a bottom side of an isosceles triangle, a bottom surface of the triangular prism-shaped dielectric resonator is parallel to the XOY plane, a height of the isosceles triangle of the bottom surface is parallel to the X axis, and the bottom side of the isosceles triangle of the bottom surface is parallel to the Y axis; the height direction of the dielectric resonator is parallel to the Z-axis.
Fig. 7-9 are schematic diagrams of the above-described 3 radiation patterns, respectively. Specifically, FIG. 7 shows aTMZ101, which is an electric field distribution diagram of the XOZ plane (y is 0) of the dielectric resonator; FIG. 8 shows aTMX103, which is an electric field distribution diagram of the XOY plane (z is 4) of the dielectric resonator; FIG. 9 shows a TMZAnd 113, which is an electric field distribution diagram of the XOZ plane (y is 0) of the dielectric resonator.
The embodiment reduces the space occupied by the millimeter wave array in the terminal, and simplifies the design difficulty.
In summary, according to the ultra-wideband dielectric resonator antenna module and the electronic device provided by the invention, the shape, the size and the dielectric constant of the dielectric resonator are designed, so that the dielectric resonator can excite a plurality of radiation modes, thereby realizing ultra-wideband; the dielectric resonator antenna formed by the ceramic body has high processing precision, small volume in a millimeter wave frequency band and lower cost, and has great advantages compared with a PCB (printed Circuit Board); by arranging the low-frequency line and the feeder line on both sides of the dielectric substrate, respectively, low-frequency signals and radio-frequency signals can be separated, preventing crosstalk. The invention can cover n257(26.5-29.5GHz), n258(24.25-27.25GHz), n260(37-40GHz) and n261(27.5-28.35GHz), has wide coverage frequency band, is suitable for handheld equipment of a 5G millimeter wave communication system, can reduce the space occupied by a millimeter wave array in a terminal, and simplifies the design difficulty.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.