CN116706527A - High-isolation multi-notch UWB-MIMO antenna - Google Patents
High-isolation multi-notch UWB-MIMO antenna Download PDFInfo
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
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- H—ELECTRICITY
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- 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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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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
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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
- H01Q9/0471—Non-planar, stepped or wedge-shaped patch
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Abstract
The invention discloses a multi-notch UWB-MIMO antenna with high isolation. The antenna comprises a dielectric substrate, two radiating units, a grounding unit and an isolation unit; each radiation unit comprises a radiation patch and a gradual change feeder line; one side of the radiation patch is provided with a multi-stage ladder; each radiation unit is etched with a notch structure; the notch structure of each radiating element comprises a first L-shaped groove and a second L-shaped groove nested in the first L-shaped groove; the length of the first L-shaped groove is different from that of the second L-shaped groove, and the width of the first L-shaped groove is equal to that of the second L-shaped groove; the isolation unit comprises a T-shaped patch and branches. The antenna can cover 2.73-12GHz, has the relative bandwidth reaching 124 percent, has higher diversity characteristic, can effectively utilize the influence of multipath to improve the system capacity and has high isolation. The antenna has the advantages of smaller size, novel structure, portability, easy manufacture and low processing cost, and has high application value in a portable mobile communication system.
Description
Technical Field
The invention relates to a UWB-MIMO antenna, in particular to a multi-notch UWB-MIMO antenna with high isolation.
Background
From the nineties of the last century to the current society, the development of wireless communication systems has increased, and research into communication schemes has never stopped. With the development of communication technology, high capacity, multiple connections, and high speed are urgent requirements. Ultra-wideband (UWB) technology receives wide attention from researchers due to the characteristics of high data transmission rate, strong anti-interference capability and the like. However, the power spectral density of ultra wideband systems tends to be relatively low, limiting the transmission power to low levels. Multiple-input multiple-output (MIMO) technology is one of the most important technologies in the field of modern mobile communication technologies, and this type of antenna is composed of multiple receiving and transmitting antennas, where each receiving antenna can receive electromagnetic waves sent by a transmitting end, and the receiving system combines identical parts of multiple received signals, so as to maximize the signal-to-noise ratio. The MIMO technology improves transmission rate and transmission quality through spatial diversity, spatial multiplexing, and beamforming techniques, can transmit more data and can suppress more interference under limited spectrum resources. Therefore, the combination of the MIMO technology and the UWB technology can well solve the problem, and meanwhile, can improve the communication quality and rate, which is a key technology for leading the rapid development of the wireless communication system in this era. And at the same time, in order to be compatible with modern portable miniaturized devices, compact UWB-MIMO antennas need to be designed.
From different application scenes, communication antennas contacted in daily life of people can be divided into three types, namely, a mobile phone, a router, a computer and wearable intelligent equipment which are most used by people, such as a wireless earphone, an LTE antenna, a WIFI antenna and a navigation antenna in a smart watch, and the like. And the circularly polarized antenna and the array antenna are used for large-scale communication equipment such as satellites and base stations, and the communication antennas contained in the large-scale equipment have the characteristics of large size, high power, high gain, omnidirectionality and the like, and are long-distance communication equipment. And thirdly, the communication antennas stored in vehicles such as automobiles, ships, airplanes and the like have the characteristics of strong interference resistance, single function and the like, and are medium-distance communication equipment. Ultra-wideband antennas have received extensive attention from students at home and abroad due to their excellent characteristics of high capacity, low cost, strong anti-interference capability, fast data interaction rate, low receive and transmit power, etc. The ultra-wideband antenna has great significance for the development of the emerging scientific and technological field in China.
In the existing ultra-wideband antenna design, the physical size is larger, and the isolation degree is not high. Since the pursuit of beauty and performance is pursued, miniaturization of antennas is extremely important, and at the same time, improvement of isolation between antenna elements is becoming a great importance, and is also the core of MIMO antenna design. On the other hand, the ultra wideband antenna has a wider working frequency band and is easy to be interfered by other signals in the working frequency band, so that the ultra wideband antenna is designed with a notch structure to eliminate the interference.
Disclosure of Invention
The invention aims to provide a multi-notch UWB-MIMO antenna with high isolation; the invention has the advantages of ultra-wideband, low coupling, low envelope correlation coefficient, high diversity gain and the like, and is suitable for a portable UWB-MIMO system.
In order to achieve the purpose of the invention, the invention adopts the following scheme:
a high isolation multi-notch UWB-MIMO antenna comprising:
a dielectric substrate;
two radiation units which are arranged in an axisymmetric way are printed on the front surface of the medium substrate;
the grounding unit is printed on the back surface of the dielectric substrate;
the isolation unit is printed on the back surface of the dielectric substrate;
wherein:
each radiation unit is of an integrated structure and comprises a radiation patch and a gradual change feeder line; a multistage ladder is arranged on one side of the radiation patch, and the narrower end of the gradual change feeder line is connected with the lowest ladder of the multistage ladder; the wider end of the gradual change feeder line is positioned at the edge of the medium substrate;
each radiation unit is etched with a notch structure; the notch structure of each radiating element comprises a first L-shaped groove and a second L-shaped groove nested in the first L-shaped groove; the first L-shaped groove and the second L-shaped groove are different in length and equal in width;
the first L-shaped groove is formed by a first horizontal wire groove and a first longitudinal wire groove, and one end of the first horizontal wire groove is positioned at the edge of the radiation unit and is arranged in an open mode; the other end of the first horizontal wire slot faces the central axes of the two radiating units, is connected with one end of the first longitudinal wire slot and is arranged in a closed mode; the other end of the first longitudinal wire groove points to the multistage ladder, and the other end of the first longitudinal wire groove is not contacted with the multistage ladder;
the second L-shaped groove is formed by a second horizontal groove and a second longitudinal groove, one end of the second horizontal groove is positioned at the edge of the radiation unit, the other end of the second horizontal groove faces the central axes of the two radiation units, is connected with one end of the second longitudinal groove and is arranged in a closed mode; the other end of the second longitudinal wire groove points to the multistage ladder, and the other end of the second longitudinal wire groove is not contacted with the multistage ladder;
preferably, the length of the first L-shaped groove is longer than that of the second L-shaped groove;
preferably, the first longitudinal wire slot is arranged in parallel with the central axis of the gradual change feeder; the second longitudinal wire slot is arranged in parallel with the central axis of the gradual change feeder;
preferably, the grounding unit has a rectangular structure with two notches, and is paved on one side of the dielectric substrate, and a blank area is reserved on the other side of the dielectric substrate;
the projections of the gradual change feeder lines of the two radiation units falling on the grounding unit are exactly positioned at the two gaps of the grounding unit; the projection of the radiation patch falling on the grounding unit is just positioned in the blank area of the dielectric substrate;
preferably, the isolation unit is located in a blank area of the dielectric substrate, and comprises a T-shaped patch and branches; the T-shaped patch is of an integrated structure and comprises a horizontal patch and a longitudinal patch; the center of the horizontal patch is connected with one end of the longitudinal patch, and the other end of the longitudinal patch is connected with the grounding unit; the branches are arranged in parallel with the horizontal patches and connected with the longitudinal patches; the branches are positioned between the horizontal patch and the grounding unit, and have intervals with the horizontal patch and the grounding unit;
the projection of the radiation patch falling on the grounding unit is staggered with the isolation unit;
preferably, the dielectric substrate is an FR4 microwave dielectric substrate having a dielectric constant of 4.4 and a loss tangent of 0.02. The dielectric substrate is a cuboid with the length of 36mm, the width of 36mm and the height of 1.6 mm.
Preferably, the radiating unit, the grounding unit and the isolation unit are made of metal copper.
Compared with the prior art, the invention has the following advantages:
the antenna can cover 2.73-12GHz, and the relative bandwidth reaches 124%.
The ECC parameters of the antenna are smaller than 0.008 in the working frequency band, are far smaller than the general requirement value of UWB-MIMO, and DG parameters are larger than 9.973196dB in the working frequency band, so that the antenna has higher diversity characteristic.
The TARC of the antenna is smaller than-9.8 dB, further shows that the coupling effect of the antenna is very low, a plurality of independent channels of a transmitting end and a receiving end of the MIMO system can be ensured, and the influence of multipath can be effectively utilized to improve the system capacity.
The antenna of the invention increases the isolation between the antennas by introducing the T-shaped structure and adding new branches on the basis, so that the antenna works in a better environment.
The antenna has the advantages of smaller size, novel structure, portability, easy manufacture and low processing cost, and has high application value in a portable mobile communication system.
Drawings
FIG. 1 is a perspective view of the UWB-MIMO antenna structure of the present invention;
fig. 2-1 is a schematic diagram of a radiating element structure of the UWB-MIMO antenna of the present invention;
fig. 2-2 is a schematic diagram of the structure of the grounding unit and the isolation unit of the UWB-MIMO antenna of the present invention;
FIG. 3 is a graph of S11, S21 parameter simulation of the UWB-MIMO antenna of the present invention;
FIG. 4 is a graph showing actual measurement of S11 and S21 parameters of the UWB-MIMO antenna of the present invention;
FIG. 5 is a radiation pattern of the UWB-MIMO antenna of the present invention at 3.1 GHz;
FIG. 6 is a radiation pattern of a UWB-MIMO antenna of the present invention at 7 GHz;
FIG. 7 is a radiation pattern of a UWB-MIMO antenna of the present invention at 10 GHz;
FIG. 8 is an ECC graph of a UWB-MIMO antenna of the present invention;
FIG. 9 is a graph of DG for a UWB-MIMO antenna of the present invention;
FIG. 10 is a graph of TRAC for a UWB-MIMO antenna of the present invention;
FIG. 11 is an S11 curve corresponding to L9 variation of the UWB-MIMO antenna of the present invention;
FIG. 12 is a distribution of 3.5GHZ surface currents for a UWB-MIMO antenna of the present invention;
FIG. 13 is a 7GHZ surface current distribution of the UWB-MIMO antenna of the present invention;
FIG. 14 is a distribution of 10GHZ surface currents for a UWB-MIMO antenna of the present invention;
the marks in the figure: 1. a dielectric substrate; 2. a radiation unit; 3. a grounding unit; 4. an isolation unit; 21. a radiating patch; 22. a gradual change feeder line; 23. a notch structure; 231. a first L-shaped groove; 232. a second L-shaped groove; 233. a multi-stage ladder; 2311. a first horizontal wire chase; 2312. a first longitudinal trunking; 2321. a second horizontal wire chase; 2322. a second longitudinal slot; 31. a notch; 32. blank area; 41. t-shaped patches; 42. branch knots; 411. a horizontal patch; 412. a longitudinal patch.
Detailed Description
The present invention will be described in further detail with reference to specific examples and drawings, but the present invention is not limited to the examples.
The multi-notch UWB-MIMO antenna with high isolation, as shown in figures 1, 2-1 and 2-2, comprises a dielectric substrate 1; two axisymmetrically arranged radiation units 2 printed on the front surface of the medium substrate 1; a grounding unit 3 and an isolation unit 4 printed on the back surface of the dielectric substrate 1; each radiating element 2 is of an integrally formed structure and comprises a radiating patch 21 and a gradual change feeder 22; a multistage ladder is arranged on one side of the radiation patch 21, wherein the narrower end of the gradual change feeder 22 is connected with the lowest ladder of the multistage ladder; the wider end of the gradual feed line 22 is positioned at the edge of the dielectric substrate 1;
each radiating element 2 is etched with a notch structure 23; the notch structure 23 of each radiating element 2 comprises a first L-shaped slot 231, and a second L-shaped slot 232 nested within said first L-shaped slot 231; the first L-shaped groove 231 and the second L-shaped groove 232 are different in length and equal in width;
the first L-shaped slot 231 is formed by a first horizontal slot 2311 and a first longitudinal slot 2312, wherein one end of the first horizontal slot 2311 is located at the edge of the radiation unit 2 and is arranged in an open manner; the other end of the first horizontal slot 2311 faces the central axes of the two radiating units 2, is connected with one end of the first longitudinal slot 2312, and is arranged in a closed manner; the other end of the first longitudinal wire groove 2312 is directed to the multistage step, and the other end of the first longitudinal wire groove 2312 is not in contact with the multistage step;
the second L-shaped slot 232 is formed by a second horizontal slot 2321 and a second longitudinal slot 2322, one end of the second horizontal slot 2321 is located at the edge of the radiation unit 2, and the other end of the second horizontal slot 2321 faces the central axes of the two radiation units 2, is connected with one end of the second longitudinal slot 2322, and is arranged in a closed manner; the other end of the second longitudinal slot 2322 is directed toward the multi-stage ladder, and the other end of the second longitudinal slot 2322 is not in contact with the multi-stage ladder;
the length of the first L-shaped groove 231 is greater than the length of the second L-shaped groove 232;
the first longitudinal slot 2312 is disposed parallel to the central axis of the gradual feed line 22; the second longitudinal slot 2322 is disposed parallel to the central axis of the gradual feeder 22;
the grounding unit 3 has a rectangular structure with two notches 31, and is laid on one side of the dielectric substrate 1, and a blank area 32 is reserved on the other side of the dielectric substrate 1;
the projections of the graded feed lines 22 of the two radiating elements 2 falling on the grounding element 3 are exactly located at the two notches 31 of the grounding element 3; the projection of the radiation patch 21 falling on the grounding unit 3 is just positioned in the blank area 32 of the dielectric substrate 1;
the isolation unit 4 is positioned in the blank area 32 of the dielectric substrate 1 and comprises a T-shaped patch 41 and branches 42; the T-shaped patch 41 is an integrally formed structure, and comprises a horizontal patch 411 and a longitudinal patch 412; the center of the horizontal patch 411 is connected to one end of the longitudinal patch 412, and the other end of the longitudinal patch 412 is connected to the grounding unit 3; the branches 42 are arranged in parallel with the horizontal patch 411 and connected with the longitudinal patch 412; the branch 42 is located between the horizontal patch 411 and the grounding unit 3, and has a distance from the horizontal patch 411 and the grounding unit 3;
the projection of the radiation patch 21 falling on the grounding unit 3 is staggered with the isolation unit 4.
The specific dimensions of the antenna according to the invention are shown in table 1 after simulation.
TABLE 1UWB-MIMO antenna sizes
The basic design of the radiation unit 2 is a simple rectangular patch plus a rectangular microstrip line, firstly, an E-plane symmetrical half-cut method is used for the rectangular patch and the microstrip line, so that the antenna is changed into two opposite rectangular antenna units, and then the lower half section of the microstrip line is introduced into a gradual change feeder line to improve impedance matching. In order to optimize the return loss of the antenna near the 6GHz and 10GHz frequency bands, a notch is introduced into the grounding surface, and the rectangular patch adopts multistage steps to improve the impedance matching of the antenna. However, the isolation of the antenna is not satisfied near the 4.5 and 9.5GHz frequency bands, so that the isolation is further improved by introducing a T-shaped structure and branches on the ground plane. At this time, the isolation and return loss of the antenna meet the requirements in the working frequency band. The notch is realized by slotting on the antenna radiation unit, when the total length of the introduced notch structure is about one half of the wavelength corresponding to the center frequency of a required wave band and the width is properly selected, the abnormal phenomenon of the input impedance is threaded at the two ends of the machine at the point, and the impedance mismatch appears to generate a larger reflection coefficient in the frequency band, so that the notch characteristic can be generated. And determining the antenna notch length through the calculation of a resonant frequency formula, and finally determining that the lengths of the first L-shaped groove and the second L-shaped groove are respectively 12.95mm and 11.5mm and the width is 0.5mm after simulation optimization.
The resonant frequency can be calculated from equation (1), equation (2).
Wherein ε r Epsilon is the dielectric constant of the dielectric substrate eff L is the length of the L-shaped groove, and c is the speed of light.
The reflection coefficient S11 by changing the length of the L-shaped groove is shown in fig. 11. It can be seen that the center frequency of the notch can be changed by adjusting the length of L9. And has less influence on its surrounding reflection coefficient while maintaining the notch characteristics. The length of L9 was finally determined to be 8mm to determine the first notch.
The second notch is a notch of a C wave band, the center frequency is 3.9125GHz, and the length and the position of the L-shaped groove are finally determined through formula calculation and HFSS simulation. The S11 parameters of the final antenna are shown in fig. 3-4.
Fig. 3 is a graph of S11 and S21 measured in simulation software for an antenna, in which the return loss curve and the isolation curve of the antenna are identical, since the two radiating elements are identical. It can be seen that the return loss curves of the antennas in the frequency bands of 2.73-12GHz are smaller than-10 dB, and the isolation curves are smaller than-15 dB. The frequency range of the ultra-wideband is 3.1-10.6GHz, and the relative bandwidth of the antenna reaches 124%. Fig. 4 shows the measurement result of the antenna in the microwave darkroom, and it can be seen that there are errors such as processing, and the return loss of the antenna has little effect, but the return loss values are less than-10 dB in the range of the working frequency band. Isolation in the measured environment becomes greater. The antenna meets the requirements of ultra wideband MIMO antennas. In the notch frequency band, the working performance is poor, which shows that the MIMO antenna has good notch effect in the notch frequency band, and realizes double notch of WiMAX (3.38-3.8 GHz) frequency band and c-band (3.75-4.29 GHz)
The notch principle can be further analyzed by performing simulation analysis on the surface current of the antenna. Fig. 12 shows a surface current distribution diagram of an antenna in the 3.5GHz band. As can be seen from the figure, when the antenna is in operation, the surface current of the antenna is mainly distributed in the L-shaped slot after one of the ports is excited. For this case, the surface currents along the slit are in opposite directions on the left and right sides, so that the radiation of the current on one side is cancelled by the current on the other side, and thus notch characteristics can be achieved.
Fig. 12-14 show the surface current distribution of the antenna operating at 3.5ghz,7ghz,10ghz, respectively. By means of the surface currents, it can be seen that there is good isolation between the antenna elements.
Figures 5-7 are directional diagrams of the antenna operating at 3.1GHz, 7GHz,10GHz frequencies, respectively. It can be seen that in the h-plane, the radiation pattern is almost omnidirectional.
Fig. 8 is a graph of the ECC parameters of the present antenna, where the ECC reflects the correlation between adjacent units of the MIMO antenna, and for a MIMO system, the ECC parameters should be less than 0.5. The calculation result is shown in fig. 8, and it can be seen that the ECC of the present antenna is smaller than 0.01 in the operating frequency band range. It indicates good isolation between ports.
Fig. 9 is a graph of DG parameters of the present antenna, DG is a quantized improvement in evaluating the signal-to-noise ratio of the antenna receiving the rf signal in the MIMO system. Through formula calculation, DG parameter values in the present day are shown in fig. 9, and it can be seen that DG values in the operating frequency range are all greater than 9.96663dB. The larger DG, the better the diversity.
FIG. 10 is a graph of the TARC parameters of the present antenna, TARC being the ratio of the square root of the total reflected power to the square root of the total incident power. The method can accurately represent the effective working bandwidth of the whole MIMO antenna system and the influence of signal phase change on the MIMO antenna bandwidth. The value of the reverse TARC calculated by the formula is shown in FIG. 10, and it can be seen that the value of TARC is smaller than-9.8 dB in the operating frequency range. The MIMO coupling effect is low, the lower TARC can ensure that a plurality of channels of a transmitting end and a receiving end of the MIMO system are independent, and the influence of multipath can be effectively utilized to improve the system capacity.
Claims (10)
1. A high isolation multi-notch UWB-MIMO antenna comprising:
a dielectric substrate (1);
two axisymmetrically arranged radiation units (2) are printed on the front surface of the medium substrate (1);
the grounding unit (3) is printed on the back surface of the dielectric substrate (1);
the isolation unit (4) is printed on the back surface of the dielectric substrate (1);
the method is characterized in that:
each radiation unit (2) is of an integrated structure and comprises a radiation patch (21) and a gradual change feeder line (22); a multistage ladder is arranged on one side of the radiation patch (21), wherein the narrower end of the gradual change feeder line (22) is connected with the lowest ladder of the multistage ladder; the wider end of the gradual change feeder line (22) is positioned at the edge of the medium substrate (1);
each radiating element (2) is etched with a notch structure (23); the notch structure (23) of each radiating element (2) comprises a first L-shaped groove (231), and a second L-shaped groove (232) nested within the first L-shaped groove (231); the lengths of the first L-shaped groove (231) and the second L-shaped groove (232) are different, and the widths are equal;
the first L-shaped groove (231) is formed by a first horizontal groove (2311) and a first longitudinal groove (2312), and one end of the first horizontal groove (2311) is positioned at the edge of the radiation unit (2) and is arranged in an open mode; the other end of the first horizontal wire groove (2311) faces the central axes of the two radiating units (2), is connected with one end of the first longitudinal wire groove (2312) and is arranged in a closed mode; the other end of the first longitudinal wire groove (2312) points to the multistage ladder (233), and the other end of the first longitudinal wire groove (2312) is not in contact with the multistage ladder (233);
the second L-shaped groove (232) is formed by a second horizontal groove (2321) and a second longitudinal groove (2322), and one end of the second horizontal groove (2321) is positioned at the edge of the radiation unit (2) where the second horizontal groove is positioned and is arranged in an open mode; the other end of the second horizontal wire slot (2321) faces the central axes of the two radiating units (2), is connected with one end of the second longitudinal wire slot (2322) and is arranged in a closed mode; the other end of the second longitudinal wire slot (2322) is directed toward the multistage ladder (233), and the other end of the second longitudinal wire slot (2322) is not in contact with the multistage ladder (233).
2. The multi-notch UWB-MIMO antenna of claim 1 wherein the length of the first L-shaped slot (231) is greater than the length of the second L-shaped slot (232).
3. The multi-notch UWB-MIMO antenna of claim 1 characterized in that the first longitudinal slot (2312) is arranged parallel to the central axis of the tapering feed line (22); the second longitudinal wire slot (2322) is arranged parallel to the central axis of the gradual change feeder (22).
4. The multi-notch UWB-MIMO antenna according to claim 1, characterized in that the grounding unit (3) has a rectangular structure with two notches (31) and is laid on one side of the dielectric substrate (1), leaving a blank area (32) on the other side of the dielectric substrate (1).
5. The multi-notch UWB-MIMO antenna according to claim 4, characterized in that the projections of the graded feed lines (22) of two radiating elements (2) falling on the ground element (3) are located exactly at the two notches (31) of the ground element (3); the projection of the radiation patch (21) falling on the grounding unit (3) is just positioned in a blank area (32) of the dielectric substrate (1).
6. The multi-notch UWB-MIMO antenna according to claim 4, characterized in that said isolation unit (4) is located in a blank area (32) of said dielectric substrate (1) comprising a "T" -shaped patch (41), a stub (42); the T-shaped patch (41) is of an integrated structure and comprises a horizontal patch (411) and a longitudinal patch (412); the center of the horizontal patch (411) is connected with one end of the longitudinal patch (412), and the other end of the longitudinal patch (412) is connected with the grounding unit (3).
7. The multi-notch UWB-MIMO antenna according to claim 6, characterized in that said stubs (42) are arranged parallel to said horizontal patches (411) and are connected to said longitudinal patches (412); the branches (42) are located between the horizontal patch (411) and the grounding unit (3), and have intervals with the horizontal patch (411) and the grounding unit (3).
8. The multi-notch UWB-MIMO antenna according to claim 6, characterized in that said isolation unit (4) is located in a blank area (32) of said dielectric substrate (1) comprising a "T" -shaped patch (41), a stub (42); the T-shaped patch (41) is of an integrated structure and comprises a horizontal patch (411) and a longitudinal patch (412); the projection of the radiation patch (21) falling on the grounding unit (3) is staggered with the isolation unit (4).
9. The multi-notch UWB-MIMO antenna of claim 1 wherein the dielectric substrate is an FR4 microwave dielectric substrate having a dielectric constant of 4.4 and a loss tangent of 0.02.
10. The multi-notch UWB-MIMO antenna of claim 1 wherein the radiating element, ground element, and isolation element are made of metallic copper.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117525878A (en) * | 2023-12-22 | 2024-02-06 | 南京邮电大学 | Frequency-reconfigurable microfluidic MIMO antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117525878A (en) * | 2023-12-22 | 2024-02-06 | 南京邮电大学 | Frequency-reconfigurable microfluidic MIMO antenna |
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