CN106532248B - Ultra-compact microstrip patch array antenna - Google Patents
Ultra-compact microstrip patch array antenna Download PDFInfo
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- CN106532248B CN106532248B CN201611127672.4A CN201611127672A CN106532248B CN 106532248 B CN106532248 B CN 106532248B CN 201611127672 A CN201611127672 A CN 201611127672A CN 106532248 B CN106532248 B CN 106532248B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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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
- H01Q1/50—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
- 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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Abstract
The invention discloses an ultra-compact microstrip patch array antenna, which comprises a dielectric plate, an antenna array and a metal floor, wherein the dielectric plate is provided with a plurality of slots; the antenna array and the metal floor are arranged on the dielectric plate; the antenna array consists of more than 2 antenna array units, and each antenna array unit comprises a feeder line and a radiation patch; a decoupling network is arranged between the radiation patches of each 2 antenna array units, and a certain gap is reserved between the decoupling network and each 2 radiation patches; each decoupling network is an interdigital structure formed by 2 left comb teeth and right comb teeth which are mutually oppositely inserted. The invention can greatly reduce the mutual electromagnetic coupling between the arrays under the condition of ensuring the excellent bandwidth performance of the antenna unit, and achieves the miniaturization of the antenna on the basis of ensuring certain performance, thereby realizing the ultra-compact structure of the array antenna.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to an ultra-compact microstrip patch array antenna.
Background
With the development of modern wireless communication systems, wireless terminals are always miniaturized. For microstrip array antennas to be mounted on mobile device terminals, we must accommodate this limited space by reducing the cell size or reducing the spacing between cells. However, the most direct effect of decreasing the pitch of the antenna elements of the array is to increase the coupling between the antenna elements. The energy of one unit can be coupled with surrounding array elements through media such as dielectric plates, free space and the like. The existence of such mutual coupling will have a series of influences on the radiation performance of the antenna array, such as directional diagram distortion, resonance point shift, signal-to-noise ratio reduction, etc.
At present, the operation of reducing mutual coupling between antenna arrays is mainly analyzed from two aspects: 1, reducing the coupling between antenna array elements by changing the geometric structure of the antenna or the arrangement mode of array units; and 2, loading an additional structure between adjacent radiation patches to form a forbidden band for electromagnetic wave transmission, thereby realizing mutual coupling suppression. However, these approaches have difficulty in achieving ultra-compact antenna arrays (e.g., distances between adjacent patches are less than λ/10).
In addition, to achieve miniaturization of the overall structure of the antenna, the size of the feed network should be correspondingly compressed with the radiating patch array. In general, to achieve constant-amplitude in-phase feeding, the feeding network of the array antenna serves the dual function of a power divider and a phase shifter. The phase shifter in the conventional sense is usually implemented by using a phase accumulation method, which is not favorable for realizing miniaturization of the antenna system.
Disclosure of Invention
The invention aims to solve the technical problems of large size and poor unit isolation of the conventional array antenna and provides an ultra-compact microstrip patch array antenna.
In order to solve the problems, the invention is realized by the following technical scheme:
an ultra-compact microstrip patch array antenna comprises a dielectric plate, an antenna array and a metal floor; the antenna array and the metal floor are arranged on the dielectric plate; the antenna array consists of more than 2 antenna array units, and each antenna array unit comprises a feeder line and a radiation patch; a decoupling network is arranged between the radiation patches of each 2 antenna array units, and a certain gap is reserved between the decoupling network and each 2 radiation patches; each decoupling network is an interdigital structure formed by 2 left comb teeth and right comb teeth which are mutually inserted; the left comb teeth and the right comb teeth have the same structure and are mutually independent; the left comb teeth and the right comb teeth are both formed by knuckle connecting lines and more than 2 knuckles positioned on the same side of the knuckle connecting lines, and the extending direction of the knuckles is vertical to that of the knuckle connecting lines; the knuckle of the left comb tooth is positioned on the right side of the knuckle connecting line; the knuckle of the right comb tooth is positioned on the left side of the knuckle connecting line.
In the scheme, the knuckles of the left comb tooth and the knuckles of the right comb tooth of each decoupling network are alternately arranged at intervals.
In the scheme, the length of the knuckle connecting line is longer than the length formed by all knuckles which are arranged side by side.
In the above scheme, the decoupling network and the radiation patch are located on the same layer of the dielectric slab.
In the above scheme, the feeder line is a microstrip feeder line, a back feed feeder line or a bottom feed feeder line.
In the above scheme, at least 1 composite right-hand and left-hand phase shifting unit is arranged on a feeder line of the antenna array unit; each composite left-right hand phase shifting unit consists of an interdigital capacitor, a fine strip line and a metal through hole; the interdigital capacitors are serially arranged on the feeder line, the metal via holes are arranged near the feeder line, and the interdigital capacitors and the metal via holes are connected through the fine strip lines.
In the scheme, the number of the composite left-hand and right-hand phase shifting units on different feeder lines is sequentially changed.
In the above scheme, at least 1T-shaped junction is arranged between the feed line and the feed source of the antenna array unit.
Compared with the prior art, the invention has the following characteristics:
1. for antenna arrays with different working frequency bands, the isolation between array elements can be improved by adjusting the size parameters of a decoupling network;
2. the electromagnetic mutual coupling among the array elements is reduced by utilizing the proposed structure, the distance among the array elements can be compressed to be less than 0.08 times of wavelength, and the purpose of miniaturization is achieved;
3. the phase shifter utilizing the composite left-right hand transmission line can solve the problem that the phase shifter formed by the traditional bent line occupies a larger space.
Drawings
Fig. 1 is a schematic perspective view of an ultra-compact microstrip patch array antenna.
Fig. 2 is a schematic diagram of a decoupling network.
FIG. 3 is a schematic diagram of a composite right and left hand phase shifting unit.
Fig. 4 is a comparison graph of the reflection coefficient S11 and the coupling coefficient S21 of the array antenna loaded with the decoupling network and unloaded with the decoupling network (the dotted line is simulation, and the solid line is actual measurement); (a) An antenna array not loaded with a decoupling network, and (b) an antenna array loaded with a decoupling network.
Fig. 5 is a comparison diagram of the whole S parameter simulation and actual measurement of the ultra-compact microstrip patch array antenna and the miniaturized feed network (the dotted line is simulation, and the solid line is actual measurement).
Fig. 6 is an ultra-compact microstrip patch array antenna and a miniaturized feed network overall normalized far-field pattern (dotted line is simulation, solid line is actual measurement); the (a) is H face, and the (b) is E face.
Reference numbers in the figures: 1. a dielectric plate; 2-1, knuckle; 2-2, knuckle connecting lines; 3-1, a feeder line; 3-2, radiation patch; 4. a T-shaped junction; 5-1, interdigital capacitance; 5-2 fine band lines; 5-3, metal via holes; 6. a metal floor.
Detailed Description
An ultra-compact microstrip patch array antenna is shown in figure 1 and comprises a dielectric plate 1, an antenna array, a metal floor 6, a decoupling network and a feed network.
The dielectric plate 1 is used as a carrier of the whole microstrip patch array antenna, and an antenna array, a metal floor 6, a decoupling network and a feed network are arranged on the dielectric plate. In the invention, the antenna array, the decoupling network and the feed network are positioned on the upper surface of the dielectric plate 1, and the metal floor 6 is positioned on the lower surface of the dielectric plate 1. The shape and size of the dielectric plate 1 are determined according to the shape and size of the antenna array, decoupling network and feeding network to be carried. In the preferred embodiment of the present invention, the dielectric plate 1 is in a convex shape, wherein a feeding network is arranged in a smaller area at the upper part of the convex shape, an antenna array is arranged in a larger area at the lower part of the convex shape with the size length × width of 108mm × 23mm, and the size length × width of 150mm × 80mm. The dielectric plate 1 had a thickness of 0.8mm, a relative dielectric constant of 4.4 and a loss tangent of 0.02.
The metal floor 6 is a blanket metal layer printed on the dielectric sheet 1. In the preferred embodiment of the present invention, the metal floor 6 is entirely covered on the lower surface of the dielectric sheet 1. The metal floor 6 interacts with the radiation patches 3-2 of the antenna array unit, and the metal floor and the radiation patches form a double-line structure together, so that the normal work of the antenna is ensured.
The antenna array is composed of more than 2 antenna array units, is a metal structure layer printed on the dielectric plate 1, and each antenna array unit has the same structure and is mutually independent, namely a certain distance exists between the 2 antenna array units. In the preferred embodiment of the present invention, the number of antenna array elements is 3. The size of the antenna array element is determined by the dielectric constant, the loss tangent, the thickness and the antenna operating frequency of the dielectric plate 1. In the invention, each antenna array unit consists of a feeder line 3-1 and a radiation patch 3-2, the radiation patch 3-2 needs to be covered on the surface of the dielectric plate 1, and the feeder line 3-1 can adopt an external connection form (such as back feed or bottom feed) and also can adopt a form of covering on the surface of the dielectric plate 1. The radiation patch 3-2 is connected with the feeder 3-1 directly or in a coupling way. In the preferred embodiment of the invention, the radiation patch 3-2 and the feeder 3-1 are both coated on the surface of the dielectric plate 1, the radiation patch 3-2 is rectangular, the feeder 3-1 is a strip-shaped microstrip feeder 3-1, and the radiation patch 3-2 is directly connected with the feeder 3-1.
In order to reduce the mutual influence among the antenna array units within a limited size, the invention is provided with a decoupling network between the radiation patches 3-2 of every 2 antenna array units, and a certain gap is reserved between the decoupling network and the 2 radiation patches 3-2. The decoupling network suppresses electromagnetic waves, but is not limited by the form of the feed. Referring to fig. 2, each decoupling network is an interdigital structure formed by 2 left and right comb teeth which are oppositely inserted. Wherein the left comb teeth and the right comb teeth have the same structure and are mutually independent. The left comb teeth and the right comb teeth are composed of knuckle connecting lines 2-2 and more than 2 knuckles 2-1 located on the same side of the knuckle connecting lines 2-2, the extending direction of the knuckles 2-1 is perpendicular to the extending direction of the knuckle connecting lines 2-2, and the length of the knuckle connecting lines 2-2 is longer than the length formed by all the knuckles 2-1 after being arranged side by side. The knuckle 2-1 of the left comb tooth is positioned on the right side of the knuckle connecting line 2-2; the knuckle 2-1 of the right comb is positioned on the left side of the knuckle connecting line 2-2. The left comb teeth and the right comb teeth can adopt an integral opposite insertion mode or an alternative opposite insertion mode. In the invention, the left comb teeth and the right comb teeth are alternately inserted, namely, the knuckle 2-1 of the left comb teeth and the knuckle 2-1 of the right comb teeth of each decoupling network are alternately arranged. The decoupling network is a resonance structure formed by crossed knuckle 2-1-shaped structures, and can adjust corresponding sizes (including the number N, the width N and the distance g of the knuckles 2-1) in a limited space 2 And the length L of the connecting line on both sides res Etc.) to regulate the transmission characteristics of electromagnetic waves on the surface of the structure. Under the parameters of certain specific structures, the aim of decoupling the working frequency band of the antenna is achieved.
In order to provide proper power distribution ratio and phase relation so that the antenna has a required radiation pattern as a whole, the invention also provides a feed network which comprises a composite left-right hand phase shifting unit and a T-shaped junction 4. The composite left-right hand phase shifting unit is used for realizing phase matching among the antenna array units, and the T-shaped junction 4 is used for adjusting the power distribution ratio among the antenna array units. In order to facilitate parameter adjustment, the invention needs to perform matching adjustment of equal power and then equal amplitude and same phase, that is, the feed source passes through the T-shaped junction 4, then passes through the composite left-right hand phase shifting unit, and finally is connected with the antenna array unit.
The invention adopts the composite left-right hand phase shifting unit to realize the in-phase feed of the antenna. In general, series in-phase feeding is realized by a phase delay of a whole wavelength between the radiating elements, that is, a transmission line between 2 radiating elements is about one operating wavelength long. For in-phase feeding of ultra-compact antenna arrays, the feed network size also needs to be reduced synchronously, which inevitably results in the distance between the feed ports being less than one wavelength, while the use of meander lines enables the effect of phase shifting between the feed network ports through phase accumulation, but inevitably occupies a larger size. The feed network can output electromagnetic waves in phase by additionally arranging the composite left-right hand transmission line phase-shifting unit, and simultaneously, the compact structure is ensured. From the analysis method of the circuit, the serial capacitance and the parallel inductance need to appear in a double-line structure when forming the composite left-right hand transmission line. In the invention, the composite left-right hand phase shifting unit is arranged on a feeder line 3-1 of the antenna array unit. Referring to fig. 3, each composite left-right hand phase shift unit is composed of an interdigital capacitor 5-1, a fine strip line 5-2 and a metal via hole 5-3. Interdigital capacitor 5-1 is arranged on feeder 3-1 in series, and the interdigital structure can provide the series capacitor in the composite right-hand and left-hand transmission line. The metal through hole 5-3 is arranged near the feeder line 3-1, the interdigital capacitor 5-1 is connected with the metal through hole 5-3 through the fine strip line 5-2, and the fine strip line 5-2 is connected with the metal floor 6 through the metal through hole 5-3, so that the parallel inductance can be provided. By changing the relevant parameters of the interdigitated structure (including e, s, lcap, etc.) and the fine stripline 5-2 (including line and wind), the corresponding capacitance-inductance value will change. According to the correlation theory of the composite left-right-hand transmission line, the corresponding capacitance inductance value is adjusted, the transmission state of the electromagnetic wave along the transmission line can be changed, and the phase shifting purpose is achieved. Different numbers of composite left-right hand phase shifting units are arranged on each feeder line 3-1 according to requirements, and the number of the composite left-right hand phase shifting units on different feeder lines 3-1 is changed in sequence, namely the change of the number of the composite left-right hand phase shifting units on different feeder lines 3-1 can be a change relation of linear increasing or nonlinear increasing according to design requirements. In the preferred embodiment of the present invention, the antenna array element located at the rightmost side of the dielectric plate 1 is used as the reference of all antenna array elements, the feeder line 3-1 is not provided with the composite left-right hand phase shift element, the antenna array element located in the middle is provided with 1 composite left-right hand phase shift element, and the antenna array element located in the left middle is provided with 2 composite left-right hand phase shift elements.
The invention adopts T-shaped junction 4 to distribute equal power. At least 1T-shaped junction 4 is arranged between a feed line 3-1 and a feed source of the antenna array unit, the T-shaped junction 4 is actually composed of 2 sections of microstrip lines, the line width of one section of microstrip line is thicker than that of the other section of microstrip line, and therefore a T shape is formed. In the preferred embodiment of the invention, 1T-shaped junction 4 is arranged between the antenna array unit positioned at the leftmost side of the dielectric plate 1 and the feed source; 1T-shaped junction 4 is arranged between the antenna array unit positioned in the middle of the dielectric plate 1 and the antenna array unit positioned at the leftmost side of the dielectric plate 1, namely 2T-shaped junctions 4 are arranged between the antenna array unit positioned in the middle of the dielectric plate 1 and the feed source; the antenna array unit located at the rightmost side of the dielectric plate 1 is connected with the antenna array unit located in the middle of the dielectric plate 1 through the microstrip line with equal thickness, namely, 2T-shaped junctions 4 are arranged between the antenna array unit located at the rightmost side of the dielectric plate 1 and the feed source. The output power ratio of the three output ports of the feed network after the parameters are optimized is 1:1:1. the overall structure of the feed network is that the power is divided into 1:2 and 1:1, two T-junctions 4. The greatest advantage of the T-junction 4 is that the output power ratio can be adjusted by changing the impedance of the input terminal and the other output terminal with one output terminal impedance fixed (otherwise, the line width determines the impedance). This facilitates connection to the antenna feed 3-1 having an impedance of 50 omega. In the preferred embodiment of the present invention, the length of the transmission line with the changed line width is a quarter wavelength, so as to adapt to the impedance matching between the T-junction 4 and the transmission line connected thereto.
The effect of the present invention is explained below by a specific example:
the working center frequency of the antenna array is 2.4GHz, and the working bandwidth is more than 30MHz. The radiating patches 3-2 are spaced apart by d =10mm, approximately 0.08 times the wavelength, which is the free space wavelength at a frequency of 2.4 GHz. The feed port is located at the side of the dielectric plate 1, wherein the size of the radiation patch 3-2 is as follows: l =30mm, W =30mm, and the width of the feeder line 3-1 is 1.53mm. Size of the decoupling network: l is a radical of an alcohol res ＝30mm，W res ＝8mm，W g ＝2.96mm，W s 1mm, g1=1mm, g2=0.67mm, n =0.17mm. The decoupling network is located between the radiating patches 3-2 but not connected to them and is in close proximity to the dielectric plate 1.
The simulation and actual measurement results of the S-parameters of the antenna are shown in fig. 4, where fig. 4 (a) shows the antenna array without the decoupling network loaded, and fig. 4 (b) shows the antenna array with the decoupling network loaded. It can be seen from the figure that, when the antenna array is operated at the frequency of 2.4GHz and the decoupling network is loaded, the isolation S21 of the antenna array is reduced to about-40 dB. And under the condition that mutual coupling is greatly reduced, the working bandwidth of the antenna is less influenced. Fig. 5 and 6 are comparison graphs of simulation and actual measurement results of the near field and far field directions after the decoupling network and the feed network are loaded. FIG. 5 is a graph comparing S parameters. As can be seen, the preferred embodiment of the invention has high goodness of fit with simulation data in the aspect of near-field results; fig. 6 is a normalized far field H-plane to E-plane comparison plot. It can be seen that, in the whole antenna loaded with the decoupling network, the E plane and the H plane of the radiation main lobe half-power wave number width (HPBW) of the antenna are 40 degrees and 70 degrees respectively, and the directivity requirements of the array antenna are basically met.
The invention utilizes the resonance type interdigital structure decoupling network to decouple the array antenna units, can greatly reduce the electromagnetic coupling between the adjacent radiating patches 3-2, greatly reduces the electromagnetic mutual coupling between the arrays under the condition of ensuring the excellent bandwidth performance of the antenna units, and achieves the miniaturization of the antenna on the basis of ensuring certain performance, thereby realizing the ultra-compact structure of the array antenna. Meanwhile, a miniaturized feed network is designed by using left-hand and right-hand transmission lines, and the miniaturization of the whole structure of the antenna array is finally realized. The invention has the advantages of compact structure, good decoupling effect, easy processing and the like.
Having thus described the principles, features, functions and related advantages of the present invention, it is noted that: the above simulation case is only used to illustrate the technical solution of the present invention, and is not limited. Modifications within the scope of the invention should be apparent to those skilled in the art without departing from the principles of the invention. Meanwhile, the method can still be used for solving the problem of electromagnetic decoupling in the patch type array antenna in other frequency bands by combining the scaling principle.
Claims (6)
1. An ultra-compact microstrip patch array antenna comprises a dielectric plate (1), an antenna array and a metal floor (6); wherein the antenna array and the metal floor (6) are arranged on the dielectric plate (1); the antenna array is composed of more than 2 antenna array units, and each antenna array unit comprises a feeder (3-1) and a radiation patch (3-2); the method is characterized in that:
a decoupling network is arranged between the radiation patches (3-2) of each 2 antenna array units, the decoupling network and the radiation patches (3-2) are positioned on the same layer of the dielectric plate (1), and a certain gap is reserved between the decoupling network and the 2 radiation patches (3-2); each decoupling network is an interdigital structure formed by 2 left comb teeth and right comb teeth which are mutually inserted, namely, knuckles (2-1) of the left comb teeth and knuckles (2-1) of the right comb teeth of each decoupling network are alternately arranged, and the left comb teeth and the right comb teeth can adopt an integral insertion form or an alternative insertion form; the left comb teeth and the right comb teeth have the same structure and are mutually independent; the left comb teeth and the right comb teeth are both formed by knuckle connecting lines (2-2) and more than 2 knuckles (2-1) positioned on the same side of the knuckle connecting lines (2-2), and the extending direction of the knuckles (2-1) is vertical to the extending direction of the knuckle connecting lines (2-2); the knuckle (2-1) of the left comb tooth is positioned on the right side of the knuckle connecting line (2-2); the knuckle (2-1) of the right comb tooth is positioned on the left side of the knuckle connecting line (2-2); the knuckle numbers of the left comb teeth and the right comb teeth are the same.
2. The ultra-compact microstrip patch array antenna according to claim 1 wherein: the length of the knuckle connecting line (2-2) is longer than the length formed by all knuckles (2-1) which are arranged side by side.
3. The ultra-compact microstrip patch array antenna according to claim 1 wherein: the feeder line (3-1) is a microstrip type feeder line (3-1), a back feed type feeder line (3-1) or a bottom feed type feeder line (3-1).
4. The ultra-compact microstrip patch array antenna according to claim 1 wherein: at least 1 composite left-right hand phase shifting unit is arranged on a feeder (3-1) of the antenna array unit; each composite left-right hand phase shifting unit consists of an interdigital capacitor (5-1), a fine strip line (5-2) and a metal through hole (5-3); the interdigital capacitor (5-1) is serially arranged on the feeder line (3-1), the metal via hole (5-3) is arranged near the feeder line (3-1), and the interdigital capacitor (5-1) and the metal via hole (5-3) are connected through the fine strip line (5-2).
5. The ultra-compact microstrip patch array antenna according to claim 4 wherein: the number of the composite left-right hand phase shifting units on different feeder lines (3-1) is changed in sequence.
6. The ultra-compact microstrip patch array antenna according to claim 1 wherein: at least 1T-shaped junction (4) is arranged between a feed line (3-1) and a feed source of the antenna array unit.
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| CN111527646B (en) * | 2017-12-28 | 2021-08-03 | 株式会社村田制作所 | Antenna array and antenna module |
| CN110911823A (en) * | 2018-09-18 | 2020-03-24 | 宁波奇巧电器科技有限公司 | Electromagnetic radiation multi-antenna array unit |
| CN109638440B (en) * | 2018-12-19 | 2020-05-12 | 电子科技大学 | Metamaterial-based 5G communication miniaturized broadband MIMO antenna |
| CN110207737B (en) * | 2019-05-20 | 2021-09-10 | 天津大学 | Microstrip antenna sensor system with linear array structure, sensor, detection method and preparation method |
| CN110444887B (en) * | 2019-08-19 | 2021-09-24 | 中国人民解放军空军工程大学 | Antenna electromagnetic wave isolation device and isolation method |
| CN112421229A (en) * | 2019-08-23 | 2021-02-26 | 中兴通讯股份有限公司 | Antenna decoupling device, antenna array and terminal |
| CN111600121B (en) * | 2020-05-12 | 2022-03-01 | 中天宽带技术有限公司 | Decoupling patch antenna array |
| CN111969312B (en) * | 2020-08-14 | 2022-10-28 | 中国人民解放军空军工程大学 | Antenna array |
| CN112397898B (en) * | 2020-10-22 | 2023-08-08 | Oppo广东移动通信有限公司 | Antenna array assembly and electronic equipment |
| CN112635993B (en) * | 2020-12-14 | 2022-09-02 | 重庆大学 | Dual-polarized broadband high-density base station array antenna with high isolation |
| CN112964936B (en) * | 2021-01-30 | 2023-03-21 | 天津理工大学 | Miniature antenna sensor sensitive to dielectric constant of surrounding environment |
| CN113328247B (en) * | 2021-05-25 | 2023-07-25 | 国网陕西省电力公司电力科学研究院 | Frequency locking energy-taking antenna and feeder line device |
| CN114498018B (en) * | 2022-03-04 | 2023-07-04 | 南通大学 | Low mutual coupling microstrip antenna |
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| JP4736658B2 (en) * | 2005-09-14 | 2011-07-27 | 株式会社豊田中央研究所 | Leaky wave antenna |
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