CN115036700B - Broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna - Google Patents

Broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna Download PDF

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CN115036700B
CN115036700B CN202210573771.4A CN202210573771A CN115036700B CN 115036700 B CN115036700 B CN 115036700B CN 202210573771 A CN202210573771 A CN 202210573771A CN 115036700 B CN115036700 B CN 115036700B
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circularly polarized
shaped
slot
gap
resonator antenna
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CN115036700A (en
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张经纬
黄润泽
徐�明
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Wuhan University of Technology WUT
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses a broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna, which solves the technical problem that the conventional circularly polarized dielectric resonator antenna in the prior art cannot simultaneously cover two or more published millimeter wave communication frequency bands.

Description

Broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna.
Background
With the development of communication technology, the millimeter wave frequency band has become one of the key frequency bands of the fifth generation communication technology. The antenna is used as a radio frequency front-end element in a wireless communication system, plays an important role in converting a high-frequency current signal into space electromagnetic radiation, and the working frequency band of the antenna can be expanded to a millimeter wave frequency band. In the millimeter wave band, the wireless communication system puts higher requirements on the antenna, such as wide band, multiple bands, low loss, high gain, and the like. However, as the frequency increases, the skin effect of the electric conductor antenna becomes more and more significant, and the ohmic loss increases, which results in that the radiation efficiency of the electric conductor antenna decreases as the frequency increases. The dielectric resonator antenna takes non-conductor materials such as low-loss dielectric ceramics and the like as a radiator, and ohmic loss in a radiator structure is avoided. Therefore, the dielectric resonator antenna can keep high radiation efficiency in the millimeter wave frequency band, thereby reducing the power consumption of the system. However, none of the existing circularly polarized dielectric resonator antennas can simultaneously cover two or more published millimeter wave communication bands.
Disclosure of Invention
The invention provides a broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna, which solves the technical problem that the conventional circularly polarized dielectric resonator antenna in the prior art cannot simultaneously cover two or more published millimeter wave communication frequency bands.
The invention provides a broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna, which comprises: the microstrip line is arranged on the back surface of the dielectric substrate, the metal grounding plate is arranged on the front surface of the dielectric substrate, and the dielectric block is arranged at the central position of the upper layer of the grounding plate; the microstrip lines are symmetrically distributed along the perpendicular bisector of the horizontal plane of the medium substrate; the grounding plate completely covers the dielectric substrate; a correction cross-shaped gap is formed in the grounding plate; the correction of the cross-shaped gap comprises: correcting the cross gap and the pattern gap; the corrected cross-shaped gap comprises an annular gap and gap branches circumferentially distributed on the outer side of the annular gap; the flower-shaped gaps comprise butterfly-shaped gaps with fan-shaped arms or rectangular arms and bow-tie-shaped metal sheets with fan-shaped arms or rectangular arms; the butterfly-shaped gap is arranged on the inner side of the annular gap; the bow-tie-shaped metal sheets are distributed in the butterfly-shaped gaps.
Specifically, the annular gap is a circular annular gap or a square annular gap.
Specifically, the slit branches are rectangular slit branches or fan-shaped slit branches.
Specifically, the correcting the cross-shaped gap further includes: an arc-shaped gap; the arc-shaped gaps are symmetrically distributed on the outer sides of the gap branches.
Specifically, the arc-shaped gap is an arc-shaped gap or an L-shaped arc-shaped gap.
Specifically, the microstrip line comprises a hexagonal metal sheet and a rectangular metal sheet; the rectangular metal sheet is connected to the edges of the hexagonal metal sheet and the edges of the medium substrate at the same time; and the edge of the dielectric substrate is a feed port.
Specifically, the dielectric block is a rectangular dielectric block or a cylindrical dielectric block.
Specifically, the dielectric block is dielectric ceramic sintered by a hot pressing furnace, and the relative dielectric constant is 5-9.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
the corrected cross-shaped gaps positioned right below the dielectric block in the corrected cross-shaped gaps can simultaneously excite a pair of dielectric blocks in a low-frequency band (near 25 GHz)Primary mode-
Figure BDA0003661270500000021
And &>
Figure BDA0003661270500000022
To generate circularly polarized radiation. In addition, the corrected cross slot is used as a radiator to generate new circularly polarized radiation in a low frequency band (near 27.5 GHz), at the moment, the electric field of the slot resonance mode is mainly concentrated in the annular slot of the corrected cross slot, and the electric field circumferentially distributed on the slot branches outside the annular slot mainly provides a phase difference meeting a circularly polarized condition for the slot resonance mode of the corrected cross slot; activated by a modified cross slit>
Figure BDA0003661270500000023
And &>
Figure BDA0003661270500000024
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the modified cross gap are fused with each other at a low frequency band, so that the low-frequency broadband circularly polarized radiation characteristic is realized.
In addition, the pattern slots in the modified cross-shaped pattern slots can simultaneously excite a pair of high-order modes of the dielectric block in a high-frequency band (around 37 GHz)
Figure BDA0003661270500000031
And &>
Figure BDA0003661270500000032
A mode such that the dielectric resonator antenna generates circularly polarized radiation in a high frequency band (around 37 GHz); in addition, the flower-shaped slot can generate new circularly polarized radiation in a high frequency band (around 40 GHz) as a radiator, the electric field on the flower-shaped slot is mainly concentrated around the bow-tie-shaped metal sheet of the flower-shaped slot, and the butterfly-shaped slot is used for providing phase difference meeting a circularly polarized condition for the slot resonance mode of the flower-shaped slot; actuated by pattern gaps
Figure BDA0003661270500000033
And &>
Figure BDA0003661270500000034
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the pattern gap are fused with each other in the high frequency band, thereby realizing the high frequency broadband circularly polarized radiation characteristic.
In summary, the invention firstly adopts the modified cross-shaped slot to excite a pair of main modes and a pair of high-order modes of the dielectric block at the same time, thereby realizing the dual-frequency circular polarization characteristic of the dielectric resonator antenna; and the double-frequency circularly polarized bandwidth of the dielectric resonator antenna is further widened by utilizing the self slot radiation of the modified cross-shaped slot, so that the dielectric resonator antenna has the double-frequency broadband circularly polarized radiation characteristic, and the technical problem that the conventional circularly polarized dielectric resonator antenna cannot simultaneously cover two or more published millimeter wave communication frequency bands in the prior art is effectively solved.
Drawings
Fig. 1 is a front view of a wideband dual-band circularly polarized millimeter wave dielectric resonator antenna according to an embodiment of the present invention;
fig. 2 is a top view of a wideband dual-band circularly polarized millimeter wave dielectric resonator antenna according to an embodiment of the present invention;
fig. 3 is a bottom view of the wideband dual-band circularly polarized millimeter wave dielectric resonator antenna according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation result of a port reflection coefficient of the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided in the embodiment of the present invention;
fig. 5 is a schematic diagram of a simulation result of the directional radiation axial ratio of the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention;
fig. 6 is a schematic diagram of a simulation result of directional radiation gain of the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a simulation result of the radiation efficiency of the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna according to the embodiment of the present invention;
the antenna comprises a dielectric block 1, a grounding plate 2, a dielectric substrate 3, a hexagonal metal sheet 4, a rectangular metal sheet 5, a modified cross-shaped gap 6, a flower-shaped gap 7, an arc-shaped gap 8 and a feed port 9.
Detailed Description
The embodiment of the invention provides a broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna, and solves the technical problem that the conventional circularly polarized dielectric resonator antenna in the prior art cannot simultaneously cover two or more published millimeter wave communication frequency bands.
In order to solve the technical problems, the technical scheme in the embodiment of the invention has the following general idea:
the corrected cross-shaped gap positioned right below the dielectric block in the corrected cross-shaped gap can simultaneously excite a pair of main modes of the dielectric block at a low frequency band (near 25 GHz)
Figure BDA0003661270500000041
And &>
Figure BDA0003661270500000042
To generate circularly polarized radiation. In addition, the corrected cross slot is used as a radiator to generate new circularly polarized radiation in a low frequency band (near 27.5 GHz), at the moment, the electric field of the slot resonance mode is mainly concentrated in the annular slot of the corrected cross slot, and the electric field circumferentially distributed on the slot branches outside the annular slot mainly provides a phase difference meeting a circularly polarized condition for the slot resonance mode of the corrected cross slot; activated by a modified cross slit>
Figure BDA0003661270500000043
And &>
Figure BDA0003661270500000044
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the modified cross gap are fused with each other at a low frequency band, so that the low-frequency broadband circularly polarized radiation characteristic is realized.
In addition, the correctionThe pattern slots of the cross-shaped slots can simultaneously excite a pair of high-order modes of the dielectric block in a high-frequency band (around 37 GHz)
Figure BDA0003661270500000045
And &>
Figure BDA0003661270500000046
A mode such that the dielectric resonator antenna generates circularly polarized radiation in a high frequency band (around 37 GHz); in addition, the flower-shaped slot can generate new circularly polarized radiation in a high frequency band (around 40 GHz) as a radiator, the electric field on the flower-shaped slot is mainly concentrated around the bow-tie-shaped metal sheet of the flower-shaped slot, and the butterfly-shaped slot is used for providing phase difference meeting a circularly polarized condition for the slot resonance mode of the flower-shaped slot; actuated by pattern gaps
Figure BDA0003661270500000047
And &>
Figure BDA0003661270500000048
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the pattern gap are fused with each other in the high frequency band, thereby realizing the high frequency broadband circularly polarized radiation characteristic.
In summary, in the embodiment of the present invention, the modified cross-shaped slot is adopted to excite a pair of main modes and a pair of high-order modes of the dielectric block at the same time, so as to implement the dual-frequency circular polarization characteristic of the dielectric resonator antenna; and the double-frequency circularly polarized bandwidth of the dielectric resonator antenna is further widened by utilizing the self slot radiation of the modified cross-shaped slot, so that the dielectric resonator antenna has the double-frequency broadband circularly polarized radiation characteristic, and the technical problem that the conventional circularly polarized dielectric resonator antenna cannot simultaneously cover two or more published millimeter wave communication frequency bands in the prior art is effectively solved.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
See fig. 1,Fig. 2 and fig. 3 show that the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention includes: the dielectric substrate 3, the microstrip line arranged on the back of the dielectric substrate 3, the metal grounding plate 2 arranged on the front of the dielectric substrate 3 and the dielectric block 1 arranged at the upper layer center position of the grounding plate 2; the microstrip lines are symmetrically distributed along the vertical line in the horizontal plane of the dielectric substrate 3; the grounding plate 2 completely covers the dielectric substrate 3; a correction cross-shaped gap is etched on the grounding plate 2; the center of the correction cross-shaped gap is positioned right below the geometric center of the dielectric block 1, and the correction cross-shaped gap is symmetrical left and right along any diagonal of the horizontal section of the dielectric block 1. Correcting the cross-shaped gap comprises: correcting the cross gap 6 and the pattern gap 7; the corrected cross gap 6 comprises an annular gap and gap branches circumferentially distributed on the outer side of the annular gap; the pattern gap 7 comprises a butterfly-shaped gap with a fan-shaped arm or a rectangular arm and a bow-tie-shaped metal sheet with a fan-shaped arm or a rectangular arm; the butterfly-shaped gap is arranged on the inner side of the annular gap; the bow-tie shaped metal sheets are distributed in the butterfly-shaped gaps. Specifically, the length of the long arm branch, the length of the short arm branch and the inner radius of the circular ring of the cross gap 6 are respectively corrected to be l s1 ＝0.5～1.5mm，l s2 ＝0.1～0.2mm，r 1 = 0.65-0.75 mm; the gap width of the cross gap 6 is corrected to be w s1 = 0.15-0.25 mm; the outer radius, the arc angle of the large fan-shaped branch and the arc angle of the small fan-shaped branch of the fan-shaped arm butterfly-shaped gap of the flower-shaped gap 7 are r 2 ＝0.55～0.65mm，φ 2 ＝70～90°，φ 1 40-60 degrees; the inner radius of the butterfly-shaped gap of the fan-shaped arm of the flower-shaped gap 7 is r 3 = 0.2-0.3 mm; the arc angle of the fan-shaped branch of the fan-shaped arm bow-tie-shaped metal sheet of the flower-shaped gap 7 is phi 3 40-60 degrees; the inner radius of the fan-shaped arm bow-tie-shaped metal sheet of the flower-shaped gap 7 is r 5 = 0.1-0.2 mm; the outer radius of the fan-shaped arm bow-tie-shaped metal sheet of the flower-shaped gap 7 is r 4 = 0.5-0.6 mm; the microstrip line is prepared by using a Rogers 5880 high-frequency plate with the thickness of 0.254 mm.
Specifically, the annular gap is a circular annular gap or a square annular gap. The gap branches are rectangular gap branches or fan-shaped gap branches.
In order to assist in adjusting the high-band circularly polarized radiation performance of the antenna and solve the problem of too high processing precision caused by too small size of the pattern slot 7 in the correction cross-shaped slot, the correction cross-shaped slot further comprises: an arc-shaped gap 8; the arc-shaped gaps 8 are symmetrically distributed on the outer sides of the gap branches.
Specifically, the arc-shaped slit 8 is an arc-shaped slit or an L-shaped arc-shaped slit. The inner radius and the arc angle of the arc gap 8 are r respectively 6 ＝1.25～1.35mm，φ 4 And = 50-70 deg.. The arc-shaped gap 8 has a gap width w s2 ＝0.05～0.15mm。
The structure of the microstrip line is specifically explained, and the microstrip line comprises a hexagonal metal sheet 4 and a rectangular metal sheet 5; the rectangular metal sheet 5 is connected to the edge of the hexagonal metal sheet 4 and the edge of the medium substrate 3 at the same time; the side of the dielectric substrate 3 is the feed port 9. The hexagonal metal sheet 4 can be regarded as a combination of two isosceles trapezoid metal sheets with the same size in the direction along the microstrip line, wherein the height, the width of the longer bottom edge and the width of the shorter bottom edge of each isosceles trapezoid metal sheet are respectively l m2 ＝1～1.5mm，w m2 ＝1.0～1.5mm，w m1 And = 0.70-0.80 mm. The rectangular metal sheet 5 connected to the hexagonal metal sheet 4 has a width w m1 ＝0.70～0.80mm。
Specifically, the dielectric block 1 is a rectangular dielectric block or a cylindrical dielectric block. The dielectric block 1 is dielectric ceramic sintered by a hot pressing furnace, and the relative dielectric constant is 5-9. The distance between the microstrip line and the center under the rectangular dielectric block is l m1 ＝0.5～1.5mm。
The broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the invention is further explained as follows:
the dielectric block 1 is a cuboid dielectric ceramic block with a square cross section, the length and the width of the cross section are both a, the height is h, and the dielectric block is placed above the front face of the correction cross-shaped gap in a mode that a central shaft is opposite to the central shaft and used for radiating electromagnetic waves. The length, width and height of the ceramic rectangular dielectric block 1 are respectively a = b = 2.5-3 mm and h = 2.7-3.3 mm. The correction cross-shaped gap is responsible for coupling the input electromagnetic wave energy into the dielectric block 1 and providing the electromagnetic wave energy required by radiation for the dielectric block 1. The microstrip line is responsible for guiding the guided electromagnetic wave to the position where the cross-shaped slot is corrected, and adjusting the dual-band input impedance of the dielectric block antenna. The correction cross-shaped slot is responsible for regulating and controlling the amplitude and the phase of the electromagnetic waves coupled into the dielectric block 1, so that the dielectric block 1 can radiate the electromagnetic waves with the dual-frequency circular polarization characteristic, the correction cross-shaped slot also has own radiation modes, and the radiation modes can be fused with the radiation modes of the dielectric block 1 to realize the dual-frequency broadband circular polarization radiation characteristic. The modified cross slot 6 is used for realizing circular polarization radiation of a 24.25-27.5GHz band, the pattern slot 7 is used for realizing circular polarization radiation of a 37-42.5GHz band, the arc-shaped slot 8 is used for assisting in adjusting circular polarization characteristics of the 37-42.5GHz band, and the microstrip line is used for adjusting input impedance of the dielectric block antenna at two frequency bands of 24.25-27.5GHz and 37-42.5GHz.
As shown in fig. 4, full-wave simulation is performed on the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention by using CST software, by adjusting the size of the dielectric block 1, the low-order mode and the high-order mode of the dielectric resonator antenna respectively operate near 26GHz and near 39GHz, and by adjusting the structural parameters of the microstrip line, the port reflection coefficient of the dielectric resonator antenna is less than-10 dB within the frequency ranges of 23.1-30.15GHz and 35.4-45GHz, so as to meet the requirement of impedance matching between the antenna and the port.
As shown in fig. 5, full-wave simulation is performed on the broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the invention by using CST software, and the directional radiation axial ratio of the dielectric resonator antenna is less than 3dB in the frequency ranges of 24-28.5GHz and 36-42.4GHz by adjusting and correcting the structural parameters of the cross-shaped slot, so as to achieve the purpose of unidirectional circularly polarized radiation.
As shown in fig. 6, full-wave simulation is performed on the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention by using CST software, and the directional radiation gain of the obtained dielectric resonator antenna is greater than 5dBic in both the frequency ranges of 24.25-27.5GHz and 37-42.4GHz, and the peak radiation gain in the frequency ranges of 24.25-27.5GHz and 37-42.4GHz is 5.7dBic and 7.5dBic, respectively.
As shown in fig. 7, full-wave simulation is performed on the wideband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention by using CST software, and the radiation efficiency of the obtained dielectric resonator antenna is greater than 90% in both the frequency ranges of 24.25-27.5GHz and 37-42.4 GHz.
As can be seen from fig. 4 to fig. 7, the broadband dual-band circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the present invention conforms to the characteristics of the dual-band circularly polarized unidirectional radiation antenna, and can simultaneously operate in two currently planned millimeter wave communication frequency bands, namely, 24.25 to 27.5GHz and 37 to 42.5GHz in our country.
Technical effects
1. The corrected cross-shaped gap positioned right below the rectangular dielectric block 1 in the corrected cross-shaped gaps can simultaneously excite a pair of main modes of the rectangular dielectric block 1 at a low frequency band (near 25 GHz)
Figure BDA0003661270500000081
And &>
Figure BDA0003661270500000082
To generate circularly polarized radiation. In addition, the corrected cross slot is used as a radiator to generate new circularly polarized radiation at a low frequency band (near 27.5 GHz), at the moment, the electric field of the slot resonance mode is mainly concentrated in the annular slot of the corrected cross slot, and the electric field circumferentially distributed on the slot branches outside the annular slot mainly provides a phase difference meeting a circularly polarized condition for the slot resonance mode of the corrected cross slot; activated by a modified cross slit>
Figure BDA0003661270500000083
And &>
Figure BDA0003661270500000084
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the modified cross gap are fused with each other at a low frequency band, so that the low-frequency broadband circularly polarized radiation characteristic is realized.
Further, the modified cross-shaped slits 7 can excite a pair of higher-order modes of the rectangular dielectric block 1 simultaneously in a high frequency band (around 37 GHz)
Figure BDA0003661270500000085
And &>
Figure BDA0003661270500000086
A mode such that the dielectric resonator antenna generates circularly polarized radiation in a high frequency band (around 37 GHz); in addition, the flower-shaped slot 7 itself can generate new circularly polarized radiation in a high frequency band (around 40 GHz) as a radiator, at this time, the electric field on the flower-shaped slot 7 is mainly concentrated around the bow-tie-shaped metal sheet of the flower-shaped slot 7, and the butterfly slot is used for providing a phase difference meeting a circularly polarized condition for the slot resonance mode of the flower-shaped slot 7; actuated by the pattern slit 7>
Figure BDA0003661270500000087
And &>
Figure BDA0003661270500000088
The circularly polarized radiation generated by the pattern and the circularly polarized radiation generated by the gap radiation of the pattern gap 7 are fused with each other at a high frequency band, thereby realizing the high-frequency broadband circularly polarized radiation characteristic.
In summary, in the embodiment of the present invention, the modified cross-shaped slot is adopted to excite a pair of main modes and a pair of high-order modes of the rectangular dielectric block 1 at the same time, so as to implement the dual-frequency circular polarization characteristic of the dielectric resonator antenna; and the double-frequency circularly polarized bandwidth of the dielectric resonator antenna is further widened by utilizing the self slot radiation of the modified cross-shaped slot, so that the dielectric resonator antenna has the double-frequency broadband circularly polarized radiation characteristic, and the technical problem that the conventional circularly polarized dielectric resonator antenna cannot simultaneously cover two or more published millimeter wave communication frequency bands in the prior art is effectively solved.
2. MgSiO sintered by hot pressing furnace 3 The dielectric block 1 made of the dielectric ceramic can have higher crystallinity and better air tightness, thereby obtainingLower dielectric loss and more stable dielectric property are obtained.
3. The microstrip line is manufactured by using the low-loss Rogers 5880 high-frequency plate, so that the dielectric loss of the dielectric substrate can be further reduced, the dielectric resonator antenna can have higher radiation efficiency, and the microstrip line can be further suitable for millimeter wave wireless communication.
The embodiment of the invention has the characteristics of double-frequency circularly polarized radiation, unidirectional radiation, high radiation efficiency and double-frequency independent design, is suitable for a double-frequency-band circularly polarized wireless communication system, and can simultaneously work in two millimeter wave communication frequency bands, namely 24.25-27.5GHz and 37-42.5GHz. In addition, the broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna provided by the embodiment of the invention has the advantages of compact structure, convenience in feeding, easiness in processing of the dielectric block structure and the like, and has good application value.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. A broadband dual-frequency circularly polarized millimeter wave dielectric resonator antenna is characterized by comprising: the microstrip line is arranged on the back surface of the dielectric substrate, the metal grounding plate is arranged on the front surface of the dielectric substrate, and the dielectric block is arranged at the central position of the upper layer of the grounding plate; the microstrip lines are symmetrically distributed along the perpendicular bisector of the horizontal plane of the medium substrate; the grounding plate completely covers the dielectric substrate; a correction cross-shaped gap is arranged on the grounding plate; the correction of the cross-shaped gap comprises: correcting the cross gaps and the pattern gaps; the corrected cross-shaped gap comprises an annular gap and gap branches circumferentially distributed on the outer side of the annular gap; the flower-shaped gaps comprise butterfly-shaped gaps with fan-shaped arms or rectangular arms and bow-tie-shaped metal sheets with fan-shaped arms or rectangular arms; the butterfly-shaped gap is arranged on the inner side of the annular gap; the bow-tie-shaped metal sheets are distributed in the butterfly-shaped gaps;
a pair of main modes of the dielectric block is excited at the low frequency band of 25GHz by the corrected cross gaps which are positioned right below the dielectric block in the corrected cross-shaped gaps
Figure FDA0004097305300000011
And &>
Figure FDA0004097305300000012
To generate circularly polarized radiation; in addition, the corrected cross slot is used as a radiator to generate new circularly polarized radiation at a low frequency band of 27.5GHz, at the moment, an electric field of a slot resonance mode is mainly concentrated in the annular slot of the corrected cross slot, and an electric field circumferentially distributed on slot branches outside the annular slot mainly provides a phase difference meeting a circularly polarized condition for the slot resonance mode of the corrected cross slot; actuated by a corrected cross slit>
Figure FDA0004097305300000013
And &>
Figure FDA0004097305300000014
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the corrected cross gap are fused with each other at a low frequency band, so that the low-frequency broadband circularly polarized radiation characteristic is realized;
in addition, the pattern gaps in the modified cross-shaped pattern gaps excite a pair of high-order modes of the dielectric block at the high frequency band of 37GHz simultaneously
Figure FDA0004097305300000015
And &>
Figure FDA0004097305300000016
A mode such that the dielectric resonator antenna generates circularly polarized radiation in a 37GHz high band; in addition, the flower-shaped slot can generate new circularly polarized radiation at a high frequency band of 40GHz as a radiator, an electric field on the flower-shaped slot is mainly concentrated around the bow-tie-shaped metal sheet of the flower-shaped slot at the moment, and the butterfly-shaped slot is used for providing a phase difference meeting a circularly polarized condition for a slot resonance mode of the flower-shaped slot; actuated by pattern slit>
Figure FDA0004097305300000017
And &>
Figure FDA0004097305300000018
The circularly polarized radiation generated by the mode and the circularly polarized radiation generated by the gap radiation of the pattern gap are fused with each other in a high frequency band, so that the high-frequency broadband circularly polarized radiation characteristic is realized;
firstly, a pair of main modes and a pair of high-order modes of a dielectric block are simultaneously excited by adopting a corrected cross-shaped gap, so that the dual-frequency circular polarization characteristic of the dielectric resonator antenna is realized; and the self slot radiation of the modified cross-shaped slot is utilized to further widen the dual-frequency circularly polarized bandwidth of the dielectric resonator antenna, so that the dielectric resonator antenna has the dual-frequency broadband circularly polarized radiation characteristic.
2. The wideband dual-band circularly polarized millimeter wave dielectric resonator antenna of claim 1, wherein the annular slot is a circular slot or a square annular slot.
3. The broadband dual-band circularly polarized millimeter wave dielectric resonator antenna of claim 1, wherein the slot stub is a rectangular slot stub or a sector slot stub.
4. The wideband dual-band circularly polarized millimeter wave dielectric resonator antenna of claim 1, wherein the modified cross pattern slot further comprises: an arc-shaped gap; the arc-shaped gaps are symmetrically distributed on the outer sides of the gap branches.
5. The broadband dual-band circularly polarized millimeter wave dielectric resonator antenna according to claim 4, wherein the arc-shaped slot is an arc-shaped slot or an L-shaped arc-shaped slot.
6. The broadband dual-band circularly polarized millimeter wave dielectric resonator antenna according to claim 1, wherein the microstrip line comprises a hexagonal metal piece and a rectangular metal piece; the rectangular metal sheet is connected to the edges of the hexagonal metal sheet and the edges of the medium substrate at the same time; and the edge of the dielectric substrate is a feed port.
7. The broadband dual-band circularly polarized millimeter wave dielectric resonator antenna of claim 1, wherein the dielectric block is a rectangular dielectric block or a cylindrical dielectric block.
8. The broadband dual-band circularly polarized millimeter wave dielectric resonator antenna of claim 1, wherein the dielectric block is a dielectric ceramic sintered by a hot pressing furnace, and the relative dielectric constant is 5 to 9.
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CN104269608A (en) * 2014-09-17 2015-01-07 电子科技大学 Double-frequency circular polarization rectangular dielectric resonator antenna
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CN113161736A (en) * 2021-04-02 2021-07-23 曲阜师范大学 Double-frequency circularly polarized dielectric resonator antenna

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CN104810606B (en) * 2015-03-12 2018-01-12 电子科技大学 A kind of broadband medium resonant antenna
KR20180012157A (en) * 2016-07-26 2018-02-05 성균관대학교산학협력단 Broadband circularly polarized antenna
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CN104269608A (en) * 2014-09-17 2015-01-07 电子科技大学 Double-frequency circular polarization rectangular dielectric resonator antenna
KR102172736B1 (en) * 2019-12-23 2020-11-02 성균관대학교 산학협력단 Broadband circularly polarized antenna using t-shaped slot
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