CN113328236B - Card-inserted end-fire broadband dielectric resonator antenna - Google Patents
Card-inserted end-fire broadband dielectric resonator antenna Download PDFInfo
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- CN113328236B CN113328236B CN202110563912.XA CN202110563912A CN113328236B CN 113328236 B CN113328236 B CN 113328236B CN 202110563912 A CN202110563912 A CN 202110563912A CN 113328236 B CN113328236 B CN 113328236B
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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
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The invention belongs to the technical field of dielectric resonator antennas, and particularly provides a card-inserted end-fire broadband dielectric resonator antenna, which comprises: the dielectric resonator comprises a dielectric resonator 1, a metal floor 2, a dielectric substrate 3, a feeder 4 and a feed balun 7, wherein the feed balun and the metal floor are arranged on the upper surface of the dielectric substrate, and the feeder is arranged on the lower surface of the dielectric substrate; the dielectric substrate is in a convex shape and is fixedly connected with the dielectric resonator in a mode that the small rectangular substrate is inserted into the rectangular groove 6 on the dielectric resonator, so that slot-in type feeding is realized. According to the invention, through the slot-in feed design, the use of glue for connecting the dielectric resonator 1 and the dielectric substrate 3 is avoided, and the problem of large antenna error of the dielectric resonator is greatly reduced; in addition, the slot feed structure also realizes broadband impedance bandwidth and high front-to-back ratio bandwidth. In summary, the card-type end-fire broadband dielectric resonator antenna provided by the invention has the advantages of high front-to-back ratio of broadband and impedance composite bandwidth.
Description
Technical Field
The invention belongs to the technical field of dielectric resonator antennas, and particularly relates to a card-inserted end-fire broadband dielectric resonator antenna.
Background
The radiation characteristic of the end-fire antenna has wide application prospect in Wireless Local Area Network (WLAN) or access communication, even in the medical field, microwave thermotherapy and ablation operation.
Dielectric resonator antennas are of interest because of their low loss, high radiation efficiency, and great design freedom; however, the feeding mode of the dielectric resonator antenna is basically slot feeding, microstrip feeding and coaxial feeding, and it is difficult to implement an end-fire pattern, and the conventional dielectric resonator antenna needs to use glue to adhere the dielectric resonator on the dielectric substrate, and the thickness of the glue and air bubbles may cause the performance of the antenna to deteriorate, which is one of the reasons for limiting the development of the dielectric resonator antenna.
Disclosure of Invention
Aiming at the problems, the invention provides a card-type end-fire broadband dielectric resonator antenna which can effectively solve the problems in the prior art.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a card-inserted end-fire wideband dielectric resonator antenna comprising: the device comprises a dielectric resonator 1, a metal floor 2, a dielectric substrate 3, a feeder 4 and a feed balun 7; it is characterized in that the preparation method is characterized in that,
The dielectric resonator 1 is in a convex shape and consists of a large rectangular dielectric block and a small rectangular dielectric block, the bottom of the large rectangular dielectric block is provided with a notch in an inverted U shape, and the top end of the small rectangular dielectric block is provided with a rectangular groove 6;
the medium substrate 3 is in a convex shape and consists of a large rectangular substrate and a small rectangular substrate, the large rectangular substrate is covered with a metal floor 2, and the metal floor is provided with a gap 5 and is positioned in the middle of the joint of the large rectangular substrate and the small rectangular substrate; a feed balun 7 is arranged on the small rectangular substrate, the feed balun 7 is of a gradual change slot line structure, is connected with the gap 5 on the metal floor, and is symmetrically loaded with a pair of metal strips 8 at the terminal;
the feeder 4 is arranged on the lower surface of the dielectric substrate 3 and is positioned right below the gap;
the dielectric substrate 3 is fixedly connected with the dielectric resonator 1 in a mode that a small rectangular substrate is inserted into the rectangular groove 6.
Further, the feeder 4 is a microstrip line and is bent at the end by 180 ° to form a "J" shape.
Compared with the prior art, the invention has the advantages that:
the invention provides a card-type end-fire broadband dielectric resonator antenna, which adopts the use of slot-in feed, avoids the use of glue for connecting a dielectric resonator 1 and a dielectric substrate 3, and greatly reduces the problem of large error of the dielectric resonator antenna; in addition, the slot feed structure also realizes broadband impedance bandwidth and high front-to-back ratio bandwidth.
In conclusion, the card-type end-fire broadband dielectric resonator antenna provided by the invention has the advantages of high front-to-back ratio of broadband and impedance composite bandwidth.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a card-type end-fire broadband dielectric resonator antenna according to the present invention.
Fig. 2 is a front view of the card-inserted end-fire wideband dielectric resonator antenna shown in fig. 1.
Fig. 3 is a top view of the card-inserted end-fire wideband dielectric resonator antenna shown in fig. 1.
Fig. 4 is a bottom view of the card-inserted end-fire wideband dielectric resonator antenna shown in fig. 1.
Fig. 5 is a schematic structural view of a portion of a printed circuit board according to the present invention.
Fig. 6 shows S11 parameters and front-to-back ratio of the card-inserted end-fire wideband dielectric resonator antenna according to the embodiment of the present invention.
Fig. 7 is a graph showing the variation of the gain of the card-inserted end-fire broadband dielectric resonator antenna with frequency according to the embodiment of the present invention.
Fig. 8 shows the main polarization and cross polarization patterns of the card-type end-fire broadband dielectric resonator antenna at the E-plane and the H-plane of 6.5GHz in the embodiment of the invention.
Fig. 9 shows E-plane and H-plane directional patterns of the card-type end-fire broadband dielectric resonator antenna at 6GHz in accordance with an embodiment of the present invention.
Fig. 10 shows E-plane and H-plane directional patterns of the card-type end-fire broadband dielectric resonator antenna at 6.5GHz in accordance with an embodiment of the present invention.
FIG. 11 shows E-plane and H-plane directional patterns of a card-type end-fire broadband dielectric resonator antenna at 7GHz according to an embodiment of the invention.
FIG. 12 shows E-plane and H-plane directional patterns of a card-type end-fire broadband dielectric resonator antenna at 7.5GHz according to an embodiment of the invention.
FIG. 13 shows E-plane and H-plane directional patterns of an 8GHz card-type end-fire broadband dielectric resonator antenna according to an embodiment of the present invention.
FIG. 14 shows E-plane and H-plane directional patterns of an 8.5GHz card-type end-fire broadband dielectric resonator antenna according to an embodiment of the present invention.
FIG. 15 shows a 3D pattern of a card-type endfire broadband dielectric resonator antenna at 6.5GHz according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings by way of examples.
The present embodiment provides a card-inserted end-fire wideband dielectric resonator antenna, whose structure is shown in fig. 1, and specifically includes: a dielectric resonator 1, a metal floor 2, a dielectric substrate 3, a feeder 4, a feed balun 7, wherein,
the dielectric resonator 1 is in a convex shape and consists of a large rectangular dielectric block and a small rectangular dielectric block, the bottom of the large rectangular dielectric block is provided with a notch to enable the large rectangular dielectric block to be in an inverted U shape, the top end of the small rectangular dielectric block is provided with a rectangular groove 6 for feeding, and the notch is vertical to the direction of the rectangular groove;
The medium substrate 3 is in a convex shape and consists of a large rectangular substrate and a small rectangular substrate, the large rectangular substrate is covered with a metal floor 2, and the metal floor is provided with a gap 5 and is positioned in the middle of the joint of the large rectangular substrate and the small rectangular substrate; a feeding balun 7 is arranged on the small rectangular substrate, the feeding balun 7 is of a gradual change slot line structure, is connected with the gap 5 on the metal floor, and is symmetrically loaded with a pair of metal strips 8 at the terminal;
the feeder line 4 is arranged on the lower surface of the dielectric substrate 3 and is positioned right below the gap, and the tail end of the feeder line is bent by 180 degrees to form a J shape;
the small rectangular substrate is matched with the rectangular groove in size, so that the dielectric substrate 3 is fixedly connected with the dielectric resonator 1 in a mode that the small rectangular substrate is inserted into the rectangular groove 6.
Further, in this embodiment:
the dielectric resonator 1 is made of ceramic materials, has a relative dielectric constant of 16 and is in a convex shape; the size of the large rectangular dielectric block is 19.7mm multiplied by 8.4mm multiplied by 5.1mm, the size of the small rectangular dielectric block is 16.2mm multiplied by 7mm multiplied by 5.1mm, the volume of the rectangular groove 6 for feeding arranged at the top end of the small rectangular dielectric block is 4mm multiplied by 13.67mm multiplied by 1mm, and the volume of the gap arranged at the bottom of the large rectangular dielectric block is 3.5mm multiplied by 6.4mm multiplied by 5.1 mm;
The dielectric substrate 3 is a laminated board and is made of F4BM material, and the shape of the laminated board is convex; the size of the large rectangular substrate is 30mm multiplied by 15mm, the size of the small rectangular substrate is 8.44mm multiplied by 13.67mm, and the thickness is 1 mm;
the feeder line 4 is a microstrip line with the width of 2.17mm, is bent by 180 degrees at the tail end to form a J shape, and has the total length of 16.75 mm;
the gap 5 is etched on the metal floor 2 and is positioned right above the tail end of the feeder line 4, the size of the metal floor 2 is 30mm multiplied by 15mm, and the size of the gap 5 is 0.59mm multiplied by 4.88 mm;
the feed balun 7 is of a gradual change structure, the wide edge of the feed balun is 3.93mm, the narrow edge of the feed balun is 0.73mm, the length of the feed balun is 5.94mm, and the size of a metal strip 8 loaded at the tail end of the feed balun is 2.61mm multiplied by 1.5 mm;
the metal floor 2, the feeder 4, the feed balun 7 and the metal strip 8 are all made of copper foil.
In terms of working principle, the J-shaped microstrip feeder 4 excites a slot line mode of the slot 5, then a plurality of modes of the end-fire dielectric resonator on different frequency bands are simultaneously excited through the gradually-changed feed balun 7 and the symmetrical metal strip loaded at the tail end of the gradually-changed feed balun 7, the modes are used as additional antenna radiation, an additional resonance point in the middle of a working frequency band is introduced, broadband impedance matching is finally achieved, and the front-to-back ratio of the antenna can be improved in an auxiliary mode.
The end-fire dielectric resonator antenna is subjected to simulation test, and the result is as follows:
as shown in fig. 6, which is a simulation result of the S11 parameter and the front-to-back ratio of the card-type end-fire broadband dielectric resonator antenna in this embodiment, it can be seen from the figure that the reflection coefficient is lower than-10 dB at 5.48 GHz-8.2 GHz, the front-to-back ratio is higher than 15dB at 5 GHz-8.13 GHz, the effective bandwidth of the coincidence of the two is 5.48 GHz-8.13 GHz, and the relative effective bandwidth reaches about 39%;
fig. 7 shows a curve of the gain of the card-type end-fire wideband dielectric resonator antenna along with the frequency when phi is 0 ° and Theta is 0 °, which shows that the maximum fluctuation of the gain in the band is about 3dB, and the gain is relatively stable;
fig. 8 shows the main polarization and cross polarization directional patterns of the E-plane and H-plane at 6.5GHz of the insertion card type end-fire broadband dielectric resonator antenna of the present embodiment;
fig. 9 to 14 show the E-plane and H-plane directional patterns of the card-type end-fire broadband dielectric resonator antenna in this embodiment at 6, 6.5, 7, 7.5, 8, and 8.5GHz, respectively, and the in-band gain fluctuation is small;
as shown in fig. 15, which is a 3D directional diagram of the wideband dielectric resonator antenna with a plug-in card type endfire in this embodiment at 6.5GHz, it can be seen that the endfire performance of the present invention is good.
In summary, the present embodiment provides a card-inserted end-fire broadband dielectric resonator antenna, which has the advantages of high front-to-back ratio of broadband and impedance complex bandwidth.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (2)
1. A card-inserted end-fire wideband dielectric resonator antenna comprising: the device comprises a dielectric resonator (1), a metal floor (2), a dielectric substrate (3), a feeder line (4) and a feed balun (7); it is characterized in that the preparation method is characterized in that,
the dielectric resonator (1) is in a convex shape and consists of a large rectangular dielectric block and a small rectangular dielectric block, the bottom of the large rectangular dielectric block is provided with a notch and is in an inverted U shape, the top end of the large rectangular dielectric block is connected with the small rectangular dielectric block, and the top end of the small rectangular dielectric block is provided with a rectangular groove (6);
the medium substrate (3) is in a convex shape and consists of a large rectangular substrate and a small rectangular substrate, a metal floor (2) covers the large rectangular substrate, a gap (5) is formed in the metal floor, and the metal floor is positioned in the middle of the joint of the large rectangular substrate and the small rectangular substrate; a feeding balun (7) is arranged on the small rectangular substrate, is of a gradual change slot line structure, is connected with a gap (5) on the metal floor, and is symmetrically loaded with a pair of metal strips (8) at the terminal;
The feeder line (4) is arranged on the lower surface of the dielectric substrate (3) and is positioned right below the gap;
the dielectric substrate (3) is fixedly connected with the dielectric resonator (1) in a mode that the small rectangular substrate is inserted into the rectangular groove (6).
2. The card-inserted end-fire wideband dielectric resonator antenna according to claim 1, wherein said feeder (4) is a microstrip line and bent 180 ° at its end to form a "J" shape.
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| CN202110563912.XA CN113328236B (en) | 2021-05-24 | 2021-05-24 | Card-inserted end-fire broadband dielectric resonator antenna |
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