CN110970724B - Seven-notch microstrip antenna structure with open-loop slots mutually nested and U-shaped slots - Google Patents
Seven-notch microstrip antenna structure with open-loop slots mutually nested and U-shaped slots Download PDFInfo
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- CN110970724B CN110970724B CN201911358703.0A CN201911358703A CN110970724B CN 110970724 B CN110970724 B CN 110970724B CN 201911358703 A CN201911358703 A CN 201911358703A CN 110970724 B CN110970724 B CN 110970724B
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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
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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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- 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
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- 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
- H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
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- 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
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/328—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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Abstract
The invention discloses a seven-notch microstrip antenna structure with open-loop grooves mutually nested and U-shaped grooves, wherein the first arc-shaped open-loop resonator and the second arc-shaped open-loop resonator are different in shape, and the second arc-shaped open-loop resonator and the third arc-shaped open-loop resonator are different in shape; the distance between the first type U-shaped parasitic strips and the second type U-shaped parasitic strips is 0.9mm; the distance between the third type of U-shaped parasitic strips and the fourth type of U-shaped parasitic strips is 1mm; the distances between the U-shaped parasitic strips on the two sides of the microstrip feeder and the microstrip feeder are different; the length of the first U-shaped parasitic strip connecting arm is 6.1mm; the length of the second U-shaped parasitic strip connecting arm is 6.6mm; the length of the third U-shaped parasitic strip connecting arm is 6.5mm; the length of the fourth U-shaped parasitic strip connecting arm is 6.5mm. To solve the problem that the prior art does not have a notch antenna capable of realizing 7 notches; and secondly, the problem of strong coupling exists among all the notch structures of the existing notch antenna.
Description
Technical Field
The invention relates to the technical field of radio, in particular to a seven-notch microstrip antenna structure with open-loop slots mutually nested and U-shaped slots.
Background
In recent years, research on Ultra-Wideband (Ultra-Wideband) antennas has been receiving more and more attention, particularly, after the FCC has specified the 3.1-10.6GHz band as a civil frequency band in 2002, an Ultra-Wideband antenna of the frequency band has been developed, and the frequency band is then overlapped with some frequency bands of existing applications, such as WiMAX band uplink and downlink, INSAT band uplink and downlink, WLAN band downlink and X band uplink and downlink, which can generate electromagnetic interference on an Ultra-Wideband communication system, and to eliminate the interference, a band-stop filter or notch antenna is generally used to suppress the interference, but the size, cost and complexity of the antenna are increased by using the band-stop filter; the notch antenna is adopted, and the notch antenna capable of filtering 7 notches simultaneously does not exist in the prior art; secondly, strong coupling exists among all notch structures of the existing notch antenna, namely after one notch frequency is adjusted, other notch frequencies are changed, so that the notch antenna has poor adaptability, one notch antenna structure can only correspond to a narrow-band signal with a specific frequency, one frequency of the notch antenna needs to be changed, the structure of the whole notch antenna needs to be redesigned, in addition, the notch antenna has extremely high requirements on manufacturing precision, and the whole body is pulled and moved only if the size of one notch is out of tolerance in the notch antenna, so that the whole notch antenna is completely scrapped.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the primary purpose of the invention is to provide a seven-notch microstrip antenna structure with open-loop slots mutually nested and added with U-shaped slots.
The technical scheme of the invention is as follows: a seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-slot, comprising:
a dielectric substrate;
the metal grounding surface is covered on the lower surface of the dielectric substrate;
the radiation patch is covered on the upper surface of the medium substrate, the radiation patch is bilaterally symmetrical by taking the vertical central axis of the medium substrate as the central axis, the radiation patch is made of metal, a first arc-shaped open-loop resonator is arranged in the radiation patch, a second arc-shaped open-loop resonator is arranged on the radiation patch in the first arc-shaped open-loop resonator, and a third arc-shaped open-loop resonator is arranged on the radiation patch in the second arc-shaped open-loop resonator;
the microstrip feeder is covered on the upper surface of the medium substrate, the upper end of the microstrip feeder is electrically connected with the radiation patch, the central axis of the microstrip feeder coincides with the vertical central axis of the medium substrate, the upper part and the lower part of the left side of the microstrip feeder are respectively provided with a first type U-shaped parasitic strip and a second type U-shaped parasitic strip, and the upper part and the lower part of the right side of the microstrip feeder are respectively provided with a third type U-shaped parasitic strip and a fourth type U-shaped parasitic strip;
the first arc-shaped open-loop resonator is different from the second arc-shaped open-loop resonator in shape, and the second arc-shaped open-loop resonator is different from the third arc-shaped open-loop resonator in shape;
the distance between the lower edge of the first U-shaped parasitic strip and the upper edge of the second U-shaped parasitic strip is 0.9mm;
the distance between the lower edge of the third U-shaped parasitic strip and the upper edge of the fourth U-shaped parasitic strip is 1mm;
the distance between the first U-shaped parasitic strips and the second U-shaped parasitic strips and the microstrip feeder is different from the distance between the first U-shaped parasitic strips and the second U-shaped parasitic strips and the microstrip feeder;
the length of the first U-shaped parasitic strip connecting arm is 6.1mm;
the length of the second U-shaped parasitic strip connecting arm is 6.6mm;
the length of the third U-shaped parasitic strip connecting arm is 6.5mm;
the length of the fourth U-shaped parasitic strip connecting arm is 6.5mm.
Further, the radiation patch is elliptical;
the first arc-shaped open-loop resonator is elliptical similar to the radiation patch, the long axis of the first arc-shaped open-loop resonator coincides with the long axis of the radiation patch, and the short axis of the first arc-shaped open-loop resonator coincides with the short axis of the radiation patch.
Further, the second arc-shaped open-loop resonator is circular, and the center of the second arc-shaped open-loop resonator coincides with the center of the radiation patch.
Further, the third arc-shaped open-loop resonator is elliptical, the long axis of the third arc-shaped open-loop resonator coincides with the long axis of the radiation patch, and the short axis of the third arc-shaped open-loop resonator coincides with the short axis of the radiation patch.
Further, the dielectric substrate is made of Roggers5880, and has the thickness of 0.8mm, the length of 40mm and the width of 38mm;
the width of the microstrip feeder line is 1.9mm, the length is 20.2mm, and the resistance is 50Ω;
the long axis of the radiation patch is 10mm long, and the short axis of the radiation patch is 8mm long;
the notch arc length of the first arc-shaped open-loop resonator is 4mm, and the length of the first arc-shaped open-loop resonator is 43.6mm;
the notch arc length of the second arc-shaped open-loop resonator is 3mm, and the length of the second arc-shaped open-loop resonator is 33.4mm;
the notch arc length of the third arc-shaped open-loop resonator is 2.4mm, and the length of the third arc-shaped open-loop resonator is 29.77mm;
the total length of the first U-shaped parasitic strips is 17.5mm;
the total length of the second type U-shaped parasitic strips is 25.1mm;
the total length of the third U-shaped parasitic strips is 15.5mm;
the total length of the fourth type U-shaped parasitic strip is 20.5mm.
Further, the width of the first arc-shaped open-loop resonator is 0.5mm, the width of the second arc-shaped open-loop resonator is 0.4mm, and the width of the third arc-shaped open-loop resonator is 0.3mm;
the widths of the first type of U-shaped parasitic strip, the second type of U-shaped parasitic strip, the third type of U-shaped parasitic strip and the fourth type of U-shaped parasitic strip are 0.5mm.
Further, the distance between the second type of U-shaped parasitic strips and the lower edge of the dielectric substrate is 3.5mm, and the distance between the fourth type of U-shaped parasitic strips and the lower edge of the dielectric substrate is 5.9mm.
Further, the distance between the first type of U-shaped parasitic strips and the microstrip feeder is 0.55mm, the distance between the second type of U-shaped parasitic strips and the microstrip feeder is 0.55mm, the distance between the third type of U-shaped parasitic strips and the microstrip feeder is 0.35mm, and the distance between the fourth type of U-shaped parasitic strips and the microstrip feeder is 0.35mm.
The beneficial effects of the invention are as follows: compared with the prior art, the invention has the following advantages:
1) 7 notches are realized through the first arc-shaped open-loop resonator, the second arc-shaped open-loop resonator, the third arc-shaped open-loop resonator, the first U-shaped parasitic bands, the second U-shaped parasitic bands, the third U-shaped parasitic bands and the fourth U-shaped parasitic bands, namely, the notch function can be realized on narrowband signals of 7 frequency bands at the same time;
2) The shapes of the first arc-shaped open-loop resonator and the second arc-shaped open-loop resonator are different, so that the second arc-shaped open-loop resonator and the third arc-shaped open-loop resonator are different, and strong coupling influence between two adjacent resonators with similar shapes is avoided;
3) The mutual coupling between the first type U-shaped parasitic bands and the second type U-shaped parasitic bands is reduced to the minimum by setting the distance between the first type U-shaped parasitic bands and the second type U-shaped parasitic bands to 0.9mm and the distance between the third type U-shaped parasitic bands and the fourth type U-shaped parasitic bands to 1mm;
4) The distance between the first U-shaped parasitic strips and the second U-shaped parasitic strips and the microstrip feeder is different from the distance between the first U-shaped parasitic strips and the second U-shaped parasitic strips and the microstrip feeder, so that the coupling between the U-shaped parasitic strips on two sides of the microstrip feeder is reduced to the minimum;
5) By setting the lengths of the connecting arms of the various U-shaped wave traps, the minimum coupling among the wave trapping structures is ensured;
6) The invention has compact structure and smaller size, and is convenient to integrate into communication equipment;
7) The invention can adjust the trap center frequency of the independent trap structure by independently adjusting the lengths of the first arc open-loop resonator, the second arc open-loop resonator, the third arc open-loop resonator, the first U-shaped parasitic band, the second U-shaped parasitic band, the third U-shaped parasitic band or the fourth U-shaped parasitic band, and meanwhile, the trap center frequency of other trap structures is not influenced, the whole design is not needed to be pushed and reversed, the design is easier, and the adaptability is better;
8) Because the coupling among all the notch structures is small, the out-of-tolerance of any one notch structure during manufacturing does not cause the notch center frequency of the rest notch structures to change, so the manufacturing precision requirement is relatively low, and the manufacturing difficulty is lower.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a graph of antenna current distribution at 3.00GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 3 is a graph of antenna current distribution at 3.80GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 4 is a graph of antenna current distribution at 4.48GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 5 is a graph of antenna current distribution at 4.88GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 6 is a graph of antenna current distribution at 5.77GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 7 is a graph of antenna current distribution at 7.06GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 8 is a graph of antenna current distribution at 7.92GHz simulated by HFSS15.0 software in accordance with the present invention;
FIG. 9 is a return loss curve simulated by HFSS15.0 software in accordance with the present invention;
FIG. 10 is a voltage standing wave ratio curve simulated by HFSS15.0 software according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples:
implementation example 1: referring to fig. 1, a seven-notch microstrip antenna structure with open loop slots nested with U-shaped slots, includes: a dielectric substrate 5; a metal grounding surface 6, wherein the metal grounding surface 6 is covered on the lower surface of the dielectric substrate 5; the radiation patch 1 is covered on the upper surface of the medium substrate 5, the radiation patch 1 is bilaterally symmetrical by taking the vertical central axis of the medium substrate 5 as the central axis, the radiation patch 1 is made of metal, a first arc-shaped open-loop resonator 2 is arranged in the radiation patch 1, a second arc-shaped open-loop resonator 3 is arranged on the radiation patch 1 in the first arc-shaped open-loop resonator 2, and a third arc-shaped open-loop resonator 4 is arranged on the radiation patch 1 in the second arc-shaped open-loop resonator 3; the microstrip feeder 9 is covered on the upper surface of the medium substrate 5, the upper end of the microstrip feeder 9 is electrically connected with the radiation patch 1, the central axis of the microstrip feeder 9 coincides with the vertical central axis of the medium substrate 5, the upper part and the lower part of the left side of the microstrip feeder 9 are respectively provided with a first type U-shaped parasitic strip 10 and a second type U-shaped parasitic strip 11, and the upper part and the lower part of the right side of the microstrip feeder 9 are respectively provided with a third type U-shaped parasitic strip 7 and a fourth type U-shaped parasitic strip 8; the first arc-shaped open-loop resonator 2 is different from the second arc-shaped open-loop resonator 3 in shape, and the second arc-shaped open-loop resonator 3 is different from the third arc-shaped open-loop resonator 4 in shape; the distance between the lower edge of the first type U-shaped parasitic strip 10 and the upper edge of the second type U-shaped parasitic strip 11 is 0.9mm; the distance between the lower edge of the third U-shaped parasitic strip 7 and the upper edge of the fourth U-shaped parasitic strip 8 is 1mm; the distance between the first type U-shaped parasitic strip 10 and the second type U-shaped parasitic strip 11 and the microstrip feeder 9 is different from the distance between the first type U-shaped parasitic strip 10 and the second type U-shaped parasitic strip 11 and the microstrip feeder 9; the first type of U-shaped parasitic strip connection arm 102 is 6.1mm in length; the second type of U-shaped parasitic strip connection arm 112 is 6.6mm in length; the third type of U-shaped parasitic strip connection arm 702 is 6.5mm in length; the fourth type of U-shaped parasitic strip connection arm 802 is 6.5mm in length.
The radiation patch 1 is a sheet made of metal, the first arc-shaped open-loop resonator 2, the second arc-shaped open-loop resonator 3 and the third arc-shaped open-loop resonator 4 are arc-shaped grooves formed in the radiation patch 1, the arc-shaped grooves are open-loop, and two ends of the arc-shaped grooves are not communicated. The first type of U-shaped parasitic strip 10, the second type of U-shaped parasitic strip 11, the third type of U-shaped parasitic strip 7 and the fourth type of U-shaped parasitic strip 8 are thin sheets of metal material. The metal ground plane 6 is a thin sheet of metal material. The microstrip feed line 9 is a thin sheet of metal material. The invention is obtained by etching on the dielectric substrate 5 by using a printed circuit board process or an integrated circuit process.
The length of each open-loop resonator and each U-shaped parasitic strip is determined by the following equation:
wherein c is the speed of light, f notch For notch center frequency ε reff Epsilon is the effective dielectric constant r Is the dielectric constant of the substrate, h is the thickness of the substrate, ω f The microstrip line width is L, and the length of each open-loop resonator or each U-shaped parasitic band is L.
When the device works, 7 notch waves are realized through the first arc-shaped open-loop resonator 2, the second arc-shaped open-loop resonator 3, the third arc-shaped open-loop resonator 4, the first U-shaped parasitic band 10, the second U-shaped parasitic band 11, the third U-shaped parasitic band 7 and the fourth U-shaped parasitic band 8, namely, the notch wave function can be realized on the narrow-band signals of 7 frequency bands at the same time; by making the first arc-shaped open-loop resonator 2 and the second arc-shaped open-loop resonator 3 different in shape, the second arc-shaped open-loop resonator 3 and the third arc-shaped open-loop resonator 4 are different in shape, so that strong coupling influence between two adjacent resonators with similar shapes is avoided; by setting the distance between the first type of U-shaped parasitic strip 10 and the second type of U-shaped parasitic strip 11 to 0.9mm and the distance between the third type of U-shaped parasitic strip 7 and the fourth type of U-shaped parasitic strip 8 to 1mm, the mutual coupling between the first type of U-shaped parasitic strip 10 and the second type of U-shaped parasitic strip 11 is minimized, and the mutual coupling between the third type of U-shaped parasitic strip 7 and the fourth type of U-shaped parasitic strip 8 is minimized; the distance between the first U-shaped parasitic strips 10 and the second U-shaped parasitic strips 11 and the microstrip feeder 9 is different from the distance between the first U-shaped parasitic strips 10 and the second U-shaped parasitic strips 11 and the microstrip feeder 9, so that the coupling between the U-shaped parasitic strips on two sides of the microstrip feeder 9 is reduced to the minimum; by setting the lengths of the connecting arms of the various U-shaped wave traps, the minimum coupling among the wave trapping structures is ensured; the invention has compact structure and smaller size, and is convenient to integrate into communication equipment; the coupling among the trap structures is small, the trap center frequency of the independent trap structure can be adjusted by independently adjusting the lengths of the first arc-shaped open-loop resonator 2, the second arc-shaped open-loop resonator 3, the third arc-shaped open-loop resonator 4, the first U-shaped parasitic strip 10, the second U-shaped parasitic strip 11, the third U-shaped parasitic strip 7 or the fourth U-shaped parasitic strip 8, and meanwhile, the trap center frequency of other trap structures is not influenced, the whole design is not needed to be pushed and reversed, the design is easier, and the adaptability is better; because the coupling among all the notch structures is small, the out-of-tolerance of any one notch structure during manufacturing does not cause the notch center frequency of the rest notch structures to change, so the manufacturing precision requirement is relatively low, and the manufacturing difficulty is lower.
The lengths of the connecting arms of the various U-shaped wave traps are set so as to ensure that the coupling between the wave trap structures is minimum. To verify the effect of different length connecting arms on the coupling of the respective traps, the return loss S11 and frequency profile of the different length connecting arm antennas were simulated using HFSS 15.0. The results show that the first type of U-shaped parasitic strip connection arm 102 has minimal coupling to other notch structures when the length is 6.1mm, and the second type of U-shaped parasitic strip connection arm 112 has minimal coupling to other notch structures when the optimal length is 6.6mm; the third type of U-shaped parasitic strip connection arm 702 has minimal coupling to other notch structures at an optimal length of 6.5mm; the fourth type of U-shaped parasitic strip connection arm 802 has minimal coupling to other notch structures when the optimal length is 6.5mm. And the return loss S11< -10dB of the antenna in the frequency band of 2.8GHz-12GHz, the voltage standing wave ratio VSWR is less than 2, and meanwhile, the return loss S11> -5dB and the voltage standing wave ratio VSWR >12 of the antenna in the frequency bands of 2.95-3.31GHz, 3.75-3.84GHz, 4.36-4.44GHz, 4.59-4.77GHz, 5.60-5.83GHz, 6.93-7.19GHz and 7.65-8.04GHz show good notch characteristics.
Further, the radiation patch 1 is elliptical; the first arc-shaped open-loop resonator 2 is elliptical similar to the radiation patch 1, the long axis of the first arc-shaped open-loop resonator 2 coincides with the long axis of the radiation patch 1, and the short axis of the first arc-shaped open-loop resonator 2 coincides with the short axis of the radiation patch 1.
The fact that the first arcuate open loop resonator 2 is elliptical in shape similar to the radiating patch 1 means a mathematically similar concept, i.e. the two ellipses are identical in eccentricity but different in size. The method has the advantages that the first arc-shaped open-loop resonator 2 and the radiation patch 1 generate strong notch resonant frequency, the return loss of the frequency band corresponding to the first arc-shaped open-loop resonator 2 is increased, the voltage standing wave ratio is increased, and the notch characteristic of the corresponding frequency band is enhanced.
Further, the second arc-shaped open-loop resonator 3 is circular, and the center of the second arc-shaped open-loop resonator 3 coincides with the center of the radiation patch 1.
The effect is to avoid the strong mutual coupling of the first arc-shaped open-loop resonator 2 and the second arc-shaped open-loop resonator 3 due to the similar patterns.
Further, the third arc-shaped open-loop resonator 4 is elliptical, the long axis of the third arc-shaped open-loop resonator 4 coincides with the long axis of the radiation patch 1, and the short axis of the third arc-shaped open-loop resonator 4 coincides with the short axis of the radiation patch 1.
The effect is to avoid the strong mutual coupling of the third arc-shaped open-loop resonator 4 and the second arc-shaped open-loop resonator 3 due to the similar pattern.
Further, the dielectric substrate 5 is made of rogers 5880, and the thickness is 0.8mm; the width of the microstrip feeder 9 is 1.9mm, the length is 20.2mm, and the resistance is 50Ω; the long axis of the radiation patch 1 is 10mm long, and the short axis is 8mm long; the notch arc length of the first arc-shaped open-loop resonator 2 is 4mm, and the length of the first arc-shaped open-loop resonator 2 is 43.6mm; the notch arc length of the second arc-shaped open-loop resonator 3 is 3mm, and the length of the second arc-shaped open-loop resonator 3 is 33.4mm; the notch arc length of the third arc-shaped open-loop resonator 4 is 2.4mm, and the length of the third arc-shaped open-loop resonator 4 is 29.77mm; the total length of the first type U-shaped parasitic strip 10 is 17.5mm; the total length of the second type U-shaped parasitic strips 11 is 25.1mm; the total length of the third U-shaped parasitic strip 7 is 15.5mm; the overall length of the fourth class of U-shaped parasitic strips 8 is 20.5mm.
The material of the dielectric substrate 5 adopts Roggers5880, the thickness is 0.8mm, the length is 40mm, and the width is 38mm; the microstrip feeder 9 has a width of 1.9mm, a length of 20.2mm and a resistance of 50Ω to achieve impedance matching.
The notch arc length of the first arc-shaped open-loop resonator 2 is set to be 4mm, and the length of the first arc-shaped open-loop resonator 2 is set to be 43.6mm, so that the first arc-shaped open-loop resonator 2 generates notch characteristics for the frequency band of 2.96-3.33 GHz;
the notch arc length of the second arc-shaped open-loop resonator 3 is 3mm, and the length of the second arc-shaped open-loop resonator 3 is 33.4mm, so that the second arc-shaped open-loop resonator 3 generates notch characteristics for the 3.73-3.88GHz frequency band;
the notch arc length of the third arc-shaped open-loop resonator 4 is set to be 2.4mm, and the length of the third arc-shaped open-loop resonator 4 is set to be 29.77mm, so that the third arc-shaped open-loop resonator 4 generates notch characteristics for 4.36-4.44GHz frequency bands;
by setting the total length of the first U-shaped parasitic strip 10 to be 17.5mm, the first U-shaped parasitic strip 10 has notch characteristics for the frequency band of 6.93-7.19 GHz;
the total length of the second U-shaped parasitic strips 11 is 25.1mm, so that the second U-shaped parasitic strips 11 generate notch characteristics for the 4.59-4.77GHz frequency band;
the third type U-shaped parasitic band 7 generates notch characteristics for the frequency bands 6.93-7.19 by setting the total length of the third type U-shaped parasitic band 7 to be 15.5mm;
by setting the total length of the fourth type U-shaped parasitic bands 8 to be 20.5mm, the fourth type U-shaped parasitic bands 8 generate notch characteristics for the 5.60-5.83GHz frequency band.
Further, the width of the first arc-shaped open-loop resonator 2 is 0.5mm, the width of the second arc-shaped open-loop resonator 3 is 0.4mm, and the width of the third arc-shaped open-loop resonator 4 is 0.3mm; the widths of the first type of U-shaped parasitic strip 10, the second type of U-shaped parasitic strip 11, the third type of U-shaped parasitic strip 7 and the fourth type of U-shaped parasitic strip 8 are 0.5mm.
Coupling of each notch structure under different widths is simulated through HFSS15.0, return loss S11< -10dB except for a notch frequency band (namely a frequency band needing filtering) in a frequency band of 2.8GHz-12GHz is guaranteed, a voltage standing wave ratio VSWR <2, surface currents of the notch structures under different notch frequencies are respectively concentrated on different notch structures by setting the parameters, and coupling of the notch structures under the parameters is minimum.
Further, the distance between the second type of U-shaped parasitic strip 11 and the lower edge of the dielectric substrate 5 is 3.5mm, and the distance between the fourth type of U-shaped parasitic strip 8 and the lower edge of the dielectric substrate 5 is 5.9mm.
Since conductors may be arranged at the mounting position of the antenna, in order to avoid coupling caused by the fact that the second type U-shaped parasitic strip 11 and the fourth type U-shaped parasitic strip 8 are too close to the conductors, the distance between the second type U-shaped parasitic strip 11 and the lower edge of the dielectric substrate 5 is 3.5mm, and the distance between the fourth type U-shaped parasitic strip 8 and the lower edge of the dielectric substrate 5 is 5.9mm, so that the coupling between the fourth type U-shaped parasitic strip 8 and the nearby conductors is minimum under the condition that impedance matching and small enough size are met.
Further, the distance between the first type of U-shaped parasitic strip 10 and the microstrip feeder 9 is 0.55mm, the distance between the second type of U-shaped parasitic strip 11 and the microstrip feeder 9 is 0.55mm, the distance between the third type of U-shaped parasitic strip 7 and the microstrip feeder 9 is 0.35mm, and the distance between the fourth type of U-shaped parasitic strip 8 and the microstrip feeder 9 is 0.35mm.
The HFSS15.0 is adopted to simulate curves between return loss S11 and frequencies of different distances between the U-shaped notch-like structure and the microstrip feeder 9, when the coupling is verified to be minimum, the distance between the first U-shaped parasitic strip 10 and the microstrip feeder 9 is 0.55mm, the distance between the second U-shaped parasitic strip 11 and the microstrip feeder 9 is 0.55mm, the distance between the third U-shaped parasitic strip 7 and the microstrip feeder 9 is 0.35mm, and the distance between the fourth U-shaped parasitic strip 8 and the microstrip feeder 9 is 0.35mm.
The antenna current distribution diagram shown in figures 2-8 is obtained through simulation of HFSS15.0 three-dimensional electromagnetic simulation software, and as seen from the diagram,
1) For a center frequency of 3.00GHz, the surface current generated by resonance on the antenna is mainly concentrated near the first arc-shaped open-loop resonator 2, and electromagnetic energy generated by resonance at the corresponding frequency band in the places cannot radiate outwards;
2) For a center frequency of 3.80GHz, the surface current generated by resonance on the antenna is mainly concentrated near the second arc-shaped open-loop resonator 3, and electromagnetic energy generated by resonance at the corresponding frequency band at the places cannot radiate outwards;
3) For a center frequency of 4.48GHz, the surface current generated by resonance on the antenna is mainly concentrated near the third arc-shaped open-loop resonator 4, and electromagnetic energy generated by resonance at the corresponding frequency band in the places cannot radiate outwards;
4) For a center frequency of 4.88GHz, the surface current generated by resonance on the antenna is mainly concentrated near the second type U-shaped parasitic bands 11, and electromagnetic energy generated by resonance at the corresponding frequency bands cannot radiate outwards;
5) For a center frequency of 5.77GHz, the surface current generated by resonance on the antenna is mainly concentrated near the fourth U-shaped parasitic bands 8, and electromagnetic energy generated by resonance at the corresponding frequency bands cannot radiate outwards;
6) For a center frequency of 7.06GHz, the surface current generated by resonance on the antenna is mainly concentrated near the first type U-shaped parasitic bands 10, and electromagnetic energy generated by resonance at these places of the corresponding frequency bands cannot radiate outwards;
7) For a center frequency of 7.92GHz, the surface currents generated by resonance at the antenna are mainly concentrated near the third type U-shaped parasitic bands 7, where electromagnetic energy generated by resonance of the corresponding frequency bands cannot radiate outwards.
The following conclusions can be drawn:
firstly, the invention can generate notch characteristics for seven specific frequency bands of electromagnetic waves of WiMAX band uplink frequency (2.96-3.33 GHz) and downlink frequency (3.73-3.88 GHz), INSAT band uplink frequency (4.36-4.44 GHz) and downlink frequency (4.59-4.77 GHz), WLAN band downlink frequency (5.60-5.83 GHz) and X band uplink (6.93-7.19 GHz) and downlink frequency (7.65-8.04 GHz);
second, it can be seen that each notch structure corresponds to a notch center frequency, and changing the length of one of the notch structures does not affect the notch center frequencies of the other notch structures.
In order to further test the coupling between the notch structures, the lengths of the single notch structures are respectively and independently changed, and then simulation is carried out through HFSS15.0 three-dimensional electromagnetic simulation software to obtain simulation curves between return loss S11 and frequency under different lengths of the notch structures. The results show that as the length of each notch structure increases, the center frequency of the associated notch shifts toward higher frequencies and the center frequencies of the other notch structures hardly change.
Fig. 9 is a return loss curve of the antenna structure, fig. 10 is a voltage standing wave ratio curve of the antenna, and it can be seen from the graph that the return loss S11< -10dB of the antenna in the frequency band of 2.8GHz-12GHz, the voltage standing wave ratio VSWR <2, and the coverage of the frequency range of 3.1 GHz-10.6 GHz. The return loss S11> -5dB and the voltage standing wave ratio VSWR >12 of the antenna in the frequency bands of 2.95-3.31GHz, 3.75-3.84GHz, 4.36-4.44GHz, 4.59-4.77GHz, 5.60-5.83GHz, 6.93-7.19GHz and 7.65-8.04GHz show that a large amount of energy in the frequency bands cannot radiate outwards, and the antenna has obvious notch characteristics and can effectively inhibit seven frequency bands of WiMAX band uplink and downlink frequency, INSAT band uplink and downlink frequency, WLAN band downlink frequency and X band uplink and downlink frequency.
The notch structure in this patent is a generic term for the first arcuate open-loop resonator 2, the second arcuate open-loop resonator 3, the third arcuate open-loop resonator 4, the first type of U-shaped parasitic strip 10, the second type of U-shaped parasitic strip 11, the third type of U-shaped parasitic strip 7 or the fourth type of U-shaped parasitic strip 8, and the U-shaped notch structure refers to the first type of U-shaped parasitic strip 10, the second type of U-shaped parasitic strip 11, the third type of U-shaped parasitic strip 7 or the fourth type of U-shaped parasitic strip 8.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (7)
1. A seven-notch microstrip antenna structure with open loop slots nested with each other and a U-shaped slot, comprising:
a dielectric substrate (5);
a metal grounding surface (6), wherein the metal grounding surface (6) is covered on the lower surface of the dielectric substrate (5);
the radiation patch (1) is covered on the upper surface of the medium substrate (5), the radiation patch (1) is bilaterally symmetrical by taking the vertical central axis of the medium substrate (5) as the central axis, the radiation patch (1) is made of metal, a first arc-shaped open-loop resonator (2) is arranged in the radiation patch (1), a second arc-shaped open-loop resonator (3) is arranged on the radiation patch (1) in the first arc-shaped open-loop resonator (2), and a third arc-shaped open-loop resonator (4) is arranged on the radiation patch (1) in the second arc-shaped open-loop resonator (3);
the microstrip feeder (9), the microstrip feeder (9) covers the upper surface of the dielectric substrate (5), the upper end of the microstrip feeder (9) is electrically connected with the radiation patch (1), the central axis of the microstrip feeder (9) coincides with the vertical central axis of the dielectric substrate (5), the upper part and the lower part of the left side of the microstrip feeder (9) are respectively provided with a first U-shaped parasitic strip (10) and a second U-shaped parasitic strip (11), and the upper part and the lower part of the right side of the microstrip feeder (9) are respectively provided with a third U-shaped parasitic strip (7) and a fourth U-shaped parasitic strip (8);
the first arc-shaped open-loop resonator (2) is different from the second arc-shaped open-loop resonator (3), and the second arc-shaped open-loop resonator (3) is different from the third arc-shaped open-loop resonator (4);
the distance between the lower edge of the first U-shaped parasitic strip (10) and the upper edge of the second U-shaped parasitic strip (11) is 0.9mm;
the distance between the lower edge of the third U-shaped parasitic strip (7) and the upper edge of the fourth U-shaped parasitic strip (8) is 1mm;
the distance between the first type U-shaped parasitic strip (10) and the second type U-shaped parasitic strip (11) and the microstrip feeder (9) is different from the distance between the first type U-shaped parasitic strip (10) and the second type U-shaped parasitic strip (11) and the microstrip feeder (9);
the length of the first U-shaped parasitic strip connecting arm (102) is 6.1mm;
the length of the second U-shaped parasitic strip connecting arm (112) is 6.6mm;
the third type of U-shaped parasitic strip connection arm (702) is 6.5mm in length;
the length of the fourth U-shaped parasitic strip connecting arm (802) is 6.5mm;
the radiation patch (1) is elliptical;
the first arc-shaped open-loop resonator (2) is elliptical similar to the radiation patch (1), the long axis of the first arc-shaped open-loop resonator (2) is coincident with the long axis of the radiation patch (1), and the short axis of the first arc-shaped open-loop resonator (2) is coincident with the short axis of the radiation patch (1).
2. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot as claimed in claim 1, characterized in that,
the second arc-shaped open-loop resonator (3) is circular, and the center of the second arc-shaped open-loop resonator (3) coincides with the center of the radiation patch (1).
3. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot according to claim 2, wherein,
the third arc-shaped open-loop resonator (4) is elliptical, the long axis of the third arc-shaped open-loop resonator (4) is coincident with the long axis of the radiation patch (1), and the short axis of the third arc-shaped open-loop resonator (4) is coincident with the short axis of the radiation patch (1).
4. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot according to claim 3, wherein,
the dielectric substrate (5) is made of Roggers5880, and has the thickness of 0.8mm, the length of 40mm and the width of 38mm;
the width of the microstrip feeder line (9) is 1.9mm, the length is 20.2mm, and the resistance is 50Ω;
the long axis of the radiation patch (1) is 10mm long, and the short axis is 8mm long;
the notch arc length of the first arc-shaped open-loop resonator (2) is 4mm, and the length of the first arc-shaped open-loop resonator (2) is 43.6mm;
the notch arc length of the second arc-shaped open-loop resonator (3) is 3mm, and the length of the second arc-shaped open-loop resonator (3) is 33.4mm;
the notch arc length of the third arc-shaped open-loop resonator (4) is 2.4mm, and the length of the third arc-shaped open-loop resonator (4) is 29.77mm;
the total length of the first U-shaped parasitic strips (10) is 17.5mm;
the total length of the second type U-shaped parasitic strips (11) is 25.1mm;
the total length of the third U-shaped parasitic strip (7) is 15.5mm;
the total length of the fourth U-shaped parasitic strip (8) is 20.5mm.
5. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot as claimed in claim 4, characterized in that,
the width of the first arc-shaped open-loop resonator (2) is 0.5mm, the width of the second arc-shaped open-loop resonator (3) is 0.4mm, and the width of the third arc-shaped open-loop resonator (4) is 0.3mm;
the width of the first type U-shaped parasitic strip (10), the second type U-shaped parasitic strip (11), the third type U-shaped parasitic strip (7) and the fourth type U-shaped parasitic strip (8) is 0.5mm.
6. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot as claimed in claim 5, characterized in that,
the distance between the second U-shaped parasitic strip (11) and the lower edge of the dielectric substrate (5) is 3.5mm, and the distance between the fourth U-shaped parasitic strip (8) and the lower edge of the dielectric substrate (5) is 5.9mm.
7. The seven-notch microstrip antenna structure with open loop slots nested with each other and shaped like a U-shaped slot as claimed in claim 6, characterized in that,
the distance between the first U-shaped parasitic strips (10) and the microstrip feeder (9) is 0.55mm, the distance between the second U-shaped parasitic strips (11) and the microstrip feeder (9) is 0.55mm, the distance between the third U-shaped parasitic strips (7) and the microstrip feeder (9) is 0.35mm, and the distance between the fourth U-shaped parasitic strips (8) and the microstrip feeder (9) is 0.35mm.
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|---|---|---|---|---|
| CN106252870A (en) * | 2016-08-31 | 2016-12-21 | 温州大学 | A kind of double trap UWB antenna |
| CN110492236A (en) * | 2019-08-08 | 2019-11-22 | 深圳市航天华拓科技有限公司 | A kind of three trap UWB antennas |
| CN210668688U (en) * | 2019-12-25 | 2020-06-02 | 贵州民族大学 | Seven trapped wave microstrip antenna with U-shaped grooves embedded and sleeved mutually in open-loop groove |
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| CN106252870A (en) * | 2016-08-31 | 2016-12-21 | 温州大学 | A kind of double trap UWB antenna |
| CN110492236A (en) * | 2019-08-08 | 2019-11-22 | 深圳市航天华拓科技有限公司 | A kind of three trap UWB antennas |
| CN210668688U (en) * | 2019-12-25 | 2020-06-02 | 贵州民族大学 | Seven trapped wave microstrip antenna with U-shaped grooves embedded and sleeved mutually in open-loop groove |
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