CN113964513A - Wireless communication microwave antenna and forming method thereof - Google Patents
Wireless communication microwave antenna and forming method thereof Download PDFInfo
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Abstract
The invention relates to a wireless communication microwave antenna and a forming method thereof, wherein the wireless communication microwave antenna is of a double-layer structure, the upper layer is a metal layer and is of an interdigital capacitance quadruple rotational symmetry structure, the lower layer is a dielectric layer, and the upper metal layer is stacked on the lower layer and is arranged above the dielectric layer; the construction method of the four-fold rotational symmetric structure of the interdigital capacitor comprises the following steps: the interdigital zigzag capacitor structure is rotated for 3 times around the head end of the interdigital zigzag capacitor structure at intervals of 90 degrees to form a quadruple rotational symmetry structure; the head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital capacitor structure is a metal gap non-protruding end. The invention is beneficial to the development of wireless communication equipment towards miniaturization, integration and easy conformation.
Description
Technical Field
The invention belongs to the technical field of optoelectronics and electrical engineering, and relates to a wireless communication microwave antenna, in particular to a microminiaturized wireless communication microwave antenna and a forming method thereof.
Background
With the development of modern science and technology, the development of information technologies such as communication, computer and sensing is changing day by day, the information technology becomes one of the driving forces for promoting the development and progress of social economy, the wireless communication technology is taken as a component part of the information technology and plays a very important role in the current information society, the antenna is taken as a front-end component for transmitting and receiving electromagnetic waves in wireless communication equipment and has indispensable importance and criticality, and the quality of the performance of the antenna directly influences the quality of the performance of a wireless communication system. With the rapid development of wireless communication technologies, radio frequency identification technologies and other technologies, communication devices are increasingly required to be developed towards miniaturization, integration and easy conformality, and the volume of the wireless communication devices is continuously reduced. Therefore, the space available for the antenna in the wireless communication system is limited, and the miniaturization of the antenna is a problem that researchers are keen to explore.
Currently, commonly used antenna miniaturization techniques are: (1) and (4) loading technology. The method is generally divided into two types of short-circuit loading and impedance loading, wherein the short-circuit loading has the defects of unobvious antenna miniaturization, narrow working bandwidth, easy cross polarization excitation and the like, and is generally not used. Impedance loading realizes antenna miniaturization by loading resistive load through a terminal, and the method introduces a resistor near a feed point, so that the inherent sensitivity of the antenna resonance is reduced, the equivalent capacity can be increased under the condition, and the resonance frequency of the antenna moves towards the low-frequency direction, thereby playing the role of reducing the physical size of the antenna. Impedance loading, however, sacrifices the gain of the antenna while achieving broadband and miniaturization. (2) A high dielectric constant substrate. The principle of this method is that the physical size of the antenna is inversely related to the square root of the dielectric constant
The dielectric constant of the dielectric substrate is increased, so that the purpose of reducing the size of the antenna can be achieved. The dielectric constant of the dielectric substrate can be increased by using a ceramic material or a medium with high magnetic permeability. However, this causes more surface waves of the antenna to be excited at high frequencies, and the loss will also become large, resulting in a great reduction in the radiation efficiency of the antenna. (3) A metamaterial is utilized. Refers to a method of applying meta-material or some structure derived from meta-material to antenna design. The metamaterial utilizes extraordinary electromagnetic characteristics different from common materials, such as negative refraction characteristics, surface wave band rejection characteristics, transmission wave band-pass or band rejection characteristics, homodromous reflection characteristics, electromagnetic wave absorption characteristics and the like, and can achieve the purposes of increasing the working bandwidth, realizing impedance matching, improving the antenna gain, reducing the antenna size and the like. However, the meta-material is generally a periodic array structure, and the overall size thereof cannot be reduced to achieve miniaturization of the whole antenna. There are many methods for realizing antenna miniaturization, but in practical design, size reduction cannot be pursued without neglecting other performances of the antenna, and the design of the miniaturized antenna needs to take mutual consideration among other performances such as antenna size, bandwidth and gainAnd (4) cutting.
Therefore, a new principle and a new technology are urgently needed to be found to provide a possible new scheme for breaking through the microminiaturization difficulty of the wireless communication microwave antenna.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a wireless communication microwave antenna which is reasonable in design, small in size, integrated and easy to conform and a forming method thereof.
The invention solves the practical problem by adopting the following technical scheme:
the wireless communication microwave antenna is of a double-layer structure, the upper layer is a metal layer and is of an interdigital capacitor quadruple rotational symmetric structure, the lower layer is a dielectric layer, and the upper metal layer is stacked above the lower layer which is the dielectric layer.
Moreover, the construction method of the quadruple rotationally symmetric structure of the interdigital capacitor comprises the following steps: rotating the interdigital zigzag capacitor structure around the head end of the interdigital zigzag capacitor structure for 3 times at intervals of 90 degrees to form a quadruple rotational symmetric structure; the head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital capacitor structure is a metal gap non-protruding end.
Moreover, the material of the dielectric layer is selected from one of the following materials: polytetrafluoroethylene glass cloth copper foil plate F4B-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BK-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BM-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BMX-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BME-1/2, ceramic powder filled polytetrafluoroethylene glass cloth copper foil plate F4BT-1/2, polytetrafluoroethylene glass cloth plane resistance copper foil laminated plate F4BDZ294, metal-based polytetrafluoroethylene glass cloth copper foil plate F4B-1/AI (al) (Cu) F4T-1/2, microwave composite medium copper foil substrate TP-1/2, novel microwave composite medium copper foil substrate TPH-1/2, Teflon glass cloth copper foil plate F4-1/AI (Al) (Cu) F4B-1/2, A polytetrafluoroethylene ceramic composite medium substrate TF-1/2 and polytetrafluoroethylene glass varnished cloth.
Moreover, the value range of the width a of the metal gap of the interdigital zigzag capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width b of the metal strip of the interdigital capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width c of the interdigital capacitor structure is as follows: 8 a +7 b (mm); the value range of the dimension d of the four-fold rotational symmetric structure of the interdigital capacitor is as follows: 15 a +14 b (mm).
Furthermore, the ratio d/lambda of the dimension d of the four-fold rotation symmetrical structure of the interdigital capacitor to the wavelength lambda of the microwave antenna is smaller than lambda/10.
A forming method of a wireless communication microwave antenna comprises the following steps:
manufacturing an upper metal layer which is of an interdigital capacitance quadruple rotational symmetric structure;
manufacturing a lower dielectric layer, and stacking an upper metal layer above the lower dielectric layer;
the forming method of the upper metal layer comprises the following steps:
calculating the length of a gap of the microminiaturized wireless communication microwave antenna;
constructing an interdigital zigzag capacitor structure based on the gap length;
according to the interdigital zigzag capacitor structure, performing 3 rotations around the head end of the interdigital zigzag capacitor structure at intervals of 90 degrees to form a quadruple rotationally symmetrical interdigital capacitor structure of an upper metal layer;
and combining the upper metal layer and the lower dielectric layer to form the microwave antenna.
Moreover, the specific method for calculating the slot length of the microminiaturized wireless communication microwave antenna comprises the following steps:
principle based on half-wave antenna resonance
n is the refractive index of the resonant mode, L is the length of the antenna, m is the order of resonance, only considering the first-order resonance m as 1, when the wireless communication frequency is 800MHz-2.7GHz, the wavelength of the electromagnetic wave at this time is 111-375mm, and the gap length range of the antenna is calculated as 50-190 mm according to the formula.
Moreover, the specific method for constructing the interdigital zigzag capacitor structure based on the gap length comprises the following steps:
and correspondingly converting the gap length of the antenna into a zigzag gap based on the calculated gap length of the microminiaturized wireless communication microwave antenna, and constructing an interdigital zigzag capacitor structure.
And, according to the interdigital zigzag capacitor structure, the specific method of the quadruple rotationally symmetric interdigital capacitor structure which is combined into the upper metal layer by rotating 3 times around the head end of the interdigital capacitor structure at intervals of 90 degrees comprises the following steps:
the constructed interdigital capacitor structure is clockwise rotated by 90 degrees, 180 degrees and 270 degrees by taking the head end of the interdigital capacitor structure as a rotation center, and finally the interdigital capacitor structure is combined into a quadruple rotationally symmetric interdigital capacitor structure of metal copper on the upper layer; the head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital zigzag capacitor structure is a metal gap non-protruding end.
Moreover, the microwave antenna formed by combining the upper metal layer and the lower dielectric layer further comprises the following steps:
the microwave antenna formed by the microwave antenna is optimized by adjusting the dielectric constant of the dielectric layer;
and further optimizing the formed microwave antenna by adjusting the geometric parameters of the quadruple rotationally symmetric interdigital type zigzag capacitor structure.
The invention has the advantages and beneficial effects that:
1. the invention provides a microminiaturized wireless communication microwave antenna which can be used as a front-end component for receiving and transmitting wireless communication signals, realizes the transmission of the wireless communication signals, is insensitive to the polarization of electromagnetic wave signals, has the size capable of reaching deep sub-wavelength scale, realizes microminiaturization and is beneficial to the development of wireless communication equipment towards miniaturization, integration and easy conformation.
2. The invention designs the subminiaturized wireless communication microwave antenna which can enable wireless communication signals to penetrate through and is insensitive to the polarization of electromagnetic wave signals and based on the four-fold rotational symmetric structure of the interdigital capacitor by utilizing the excellent electromagnetic wave interface control capability of the microwave antenna, and breaks through the deep sub-wavelength limitation of the microwave band antenna. The invention has the characteristics of small appearance, compact size, light weight, easy manufacture and the like, is beneficial to the development of wireless communication equipment towards the direction of miniaturization, integration and easy conformation, and ensures that the wireless communication equipment has wider development and application prospects, thereby having important practical significance and practical value for modern wireless communication systems.
3. The interdigital zigzag capacitor structure is rotated by 90 degrees, 180 degrees and 270 degrees around one end point respectively, and finally combined into a quadruple rotationally symmetrical interdigital zigzag capacitor structure without array arrangement, so that the interdigital zigzag capacitor structure is small in size, small in size and light in weight, the ratio d/lambda of the size d of the interdigital zigzag capacitor structure to the wavelength lambda reaches lambda/12, the limitation of deep subwavelength of a microwave band is broken through, and microminiaturization is realized.
4. The invention has an interdigital capacitor quadruple rotational symmetric structure, so the interdigital capacitor quadruple rotational symmetric structure has the characteristic of insensitive polarization.
5. Compared with the traditional multilayer structure, the invention has thinner and easier molding because of adopting the double-layer structure.
6. The dimension d of the microwave antenna of the invention is only 13.53mm, so the microwave antenna has the characteristic of being conformal, namely the microwave antenna can be used in curved surface application.
Drawings
Fig. 1 is a schematic view illustrating an overall structure of a subminiaturized wireless communication microwave antenna according to the present invention;
fig. 2 is a schematic view of an upper layer of a subminiaturized wireless communication microwave antenna according to the present invention;
fig. 3 is a top view of a subminiaturized wireless communication microwave antenna according to the present invention;
fig. 4 is a transmission spectrum of the microminiaturized wireless communication microwave antenna of the present invention.
Detailed Description
The embodiments of the invention will be described in further detail below with reference to the accompanying drawings:
a subminiaturized wireless communication microwave antenna is shown in figure 1 and has a double-layer structure, wherein the upper layer is a metal layer and has an interdigital capacitance quadruple rotational symmetry structure; the lower layer is a dielectric layer.
As shown in fig. 1, the structure of the subminiaturized microwave antenna for wireless communication is schematically illustrated, and the subminiaturized microwave antenna for wireless communication is divided into an upper layer and a lower layer, wherein the upper layer (light color part) is a metal copper structure, and the lower layer (dark color part) is a medium.
In the embodiment, the upper layer structure is a metal copper layer, and copper which can be regarded as a perfect electric conductor in a microwave band is selected; the lower layer is a dielectric layer, and a high-quality material F4B265 with good electrical performance and high mechanical strength is selected according to the electrical performance requirement of the microwave circuit, is a high-quality microwave printed circuit substrate and has a dielectric constant of 2.65.
The construction method of the four-fold rotational symmetric structure of the interdigital capacitor comprises the following steps: the interdigital zigzag capacitor structure is rotated for 3 times around the head end of the interdigital zigzag capacitor structure at intervals of 90 degrees, a quadruple rotational symmetric structure is formed, and the interdigital zigzag capacitor structure has the characteristic of insensitivity to electromagnetic wave polarization while realizing microminiaturization.
The head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital capacitor structure is a metal gap non-protruding end.
The value range of the width a of the metal gap of the interdigital capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width b of the metal strip of the interdigital capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width c of the interdigital capacitor structure is as follows: 8 a +7 b (mm); the value range of the dimension d of the four-fold rotational symmetric structure of the interdigital capacitor is as follows: 15 a +14 b (mm).
In this embodiment, fig. 1 shows a schematic structural diagram of a subminiaturized wireless communication microwave antenna in the present invention, which is composed of two layers, an upper layer is a metal layer (fig. 2) with a thickness of 1mm, and a lower layer is a dielectric layer with a thickness of 1 mm.
In the present embodiment, in the interdigital capacitor quadruple rotational symmetric structure (fig. 2), the geometric parameters are specifically as follows, the width (i.e. the minimum line width) a of the metal gap of the interdigital zigzag capacitor structure is 0.467mm, the width b of the metal strip of the interdigital zigzag capacitor structure is 0.467mm, the width c of the interdigital zigzag capacitor structure is 7mm, and the side length d of the entire interdigital capacitor quadruple rotational symmetric structure is 13.53 mm.
The metal layer is a metal copper layer.
A molding method of a microminiaturized wireless communication microwave antenna comprises the following steps:
step 1, calculating the gap length of the microminiaturized wireless communication microwave antenna;
the specific method of the step 1 comprises the following steps:
principle based on half-wave antenna resonance
n is the refractive index of the resonant mode, L is the length of the antenna, m is the order of the resonance, only the first order resonance (m 1) is considered here, and at a radio communication frequency of 1.8GHz, the electromagnetic wave wavelength at this time is 167mm, and the slot length of the antenna is calculated according to the above formula and rounded to 84 mm.
Step 2, constructing an interdigital zigzag capacitor structure based on the calculated gap length of the microminiaturized wireless communication microwave antenna in the step 1;
the specific method of the step 2 comprises the following steps:
and (3) calculating the length of the slot of the microminiaturized wireless communication microwave antenna based on the step (1), and correspondingly converting the length of the slot of the antenna into a zigzag gap so as to construct an interdigital zigzag capacitor structure in order to reduce the size of the structure and enable resonance to be red-shifted.
Step 3, performing 3 times of rotation on the constructed interdigital capacitor structure constructed in the step 2 around the head end of the interdigital capacitor structure at intervals of 90 degrees to form a quadruple rotationally symmetrical interdigital capacitor structure of an upper metal layer;
the specific method of the step 3 comprises the following steps:
in order to further reduce the structure size, based on the interdigital zigzag capacitor structure in fig. 2, the constructed interdigital zigzag capacitor structure constructed in step 3 is rotated clockwise by 90 °, 180 °, and 270 ° (indicated by arrows) with the head end (the part indicated by reference numeral 1 in fig. 2, i.e., the head end) as the rotation center, and finally combined into a quadruple rotationally symmetric interdigital capacitor structure of metal copper on the upper layer.
As shown in fig. 2, the figure is a schematic diagram of the upper layer composition of the subminiaturized microwave antenna for wireless communication, which is based on the interdigital capacitor structure (white part) in fig. 2, and is rotated clockwise three times (shown by an arrow) with the head end as the rotation center and with 90 ° as the interval, and finally the metal copper structure part combined as the upper layer has quadruple rotational symmetry.
The head end 1 of the interdigital zigzag capacitor structure is a metal gap protruding end.
And the tail end 2 of the interdigital zigzag capacitor structure is a metal gap non-protruding end.
Fig. 3 is a top view of a structure of a microminiaturized microwave antenna for wireless communication, wherein a is a width of a metal gap of an interdigital zigzag capacitor structure, b is a width of a metal strip of the interdigital zigzag capacitor structure, c is a width of the interdigital zigzag capacitor structure, and d is a dimension of an interdigital capacitor quadruple rotational symmetry structure (i.e. a dimension of the microwave antenna structure for wireless communication).
The parameter ranges are as follows (depending mainly on b and c):
a＝0.43-0.50mm
b＝0.43-0.50mm
c＝8*a+7*b(mm)
d＝15*a+14*b(mm)
in this embodiment, the geometric parameters are specifically: 0.467mm for a, 0.467mm for b, 7mm for c, and 13.53mm for d
Step 4, combining the upper metal layer (copper layer) and the lower dielectric layer in the step 3 to form a microwave antenna;
step 5, optimizing the microwave antenna formed in the step 4 by adjusting the dielectric constant of the dielectric layer;
the specific method of the step 5 comprises the following steps:
based on the inverse relation between the physical size of the microwave antenna and the square root of the dielectric constant
By optimizing the dielectric constant epsilon of the dielectric layerrFurther reducing the size of the microwave antenna in step 4.
And 6, further optimizing the microwave antenna formed in the step 5 by adjusting the geometric parameters of the quadruple rotationally symmetric interdigital type zigzag capacitor structure, so as to break through the deep sub-wavelength limitation of the microwave band.
The specific method of the step 6 comprises the following steps:
according to the equivalent circuit theory, the resonant frequencies corresponding to the LC series circuit and the LC parallel circuit are both
The equivalent capacitance and the equivalent inductance are effectively increased by increasing the bending number of the interdigital zigzag capacitor structure and reducing the size of the zigzag gap, so that the resonant frequency is red-shifted, the ratio d/lambda of the size d of the microwave antenna to the wavelength lambda reaches lambda/12, and the deep sub-wavelength limitation of a microwave band is broken through while the microminiaturization is realized.
The design principle of the invention is as follows:
the main functions of the microminiaturized wireless communication microwave antenna are transmission of wireless communication signals and insensitivity to electromagnetic wave polarization of the wireless communication signals. The microwave antenna is a slot antenna, which is a metal plate with a slot, and belongs to a resonance type antenna, and the shape and size of the slot determine the resonance frequency of the antenna. Therefore, the shape and size of the slot are mainly modified and optimized during the design process.
Firstly, based on the principle of half-wave antenna resonance
n is the index of refraction of the resonant mode, L is the length of the antenna, and m is the order of the resonance, where only the first order resonance is considered (m 1). At a radio communication frequency of 1.8GHz, the electromagnetic wave wavelength at this time is 167mm, and the slot length of the antenna is calculated according to the above formula and is integrated to 84 mm. It should be noted that in the low frequency microwave band corresponding to the wireless sensing communication signal: (>100mm), there is a deep sub-wavelength (< lambda/10) limitation, which results in an oversized structure and difficulty in meeting the practical application requirements, and therefore, it is urgently required to design a microwave antenna structure with a size much smaller than the wavelength. To reduce the size of the structure, red-shift the resonance, there are two possible ways to reshape the structure. The first approach is to transfer the patchThe second approach is to convert the patches into meandering gaps, i.e., interdigitated meandering capacitive structures, instead of meandering lines to increase the inductance. However, due to strong ohmic losses in the metal, if the meander line structure becomes longer and thinner, the non-radiative decay rate quickly exceeds the radiative decay rate in the meander line, and the resonance becomes over-damped. In contrast, the interdigital zigzag capacitor structure is more stable to material loss and more beneficial to reducing the size of the structure. Therefore, the invention adopts a quadruple rotationally symmetric interdigital zigzag capacitor structure (as shown in figure 2) based on the length of a half-wave antenna and considering certain loss. According to the equivalent circuit theory, the microwave antenna structure is equivalent to a series circuit and a parallel circuit of a capacitor (C) and an inductor (L), and the resonant frequencies corresponding to the LC series circuit and the LC parallel circuit are both
The equivalent capacitance and the equivalent inductance are effectively increased by increasing the bending number of the interdigital type zigzag capacitor structure and reducing the size of the zigzag gap, so that the resonant frequency is red-shifted, the electrical length of the structure is effectively increased, the ratio L/lambda of the size L and the wavelength lambda of the structure is smaller than lambda/10, and the deep sub-wavelength limitation of a microwave band is broken through while the microminiaturization is realized. The invention provides a method for researching the changes of transmission, reflection and absorption of a microminiaturized wireless communication microwave antenna structure by combining an equivalent circuit theory and a numerical simulation computing system, and designs and realizes the microminiaturized and polarization insensitive wireless communication microwave antenna on the basis of a physical principle.
The quadruple rotationally symmetric interdigital capacitor structure adopted by the subminiaturized wireless communication microwave antenna effectively increases the electrical length of the structure, so that the ratio L/lambda of the size L and the wavelength lambda of the structure is smaller than lambda/10, and the limitation of deep sub-wavelength of a microwave band is broken through while subminiaturization is realized. The microminiaturized wireless communication microwave antenna realizes shielding of electromagnetic waves smaller than 1.68GHz and selective transmission (transmissivity within bandwidth > -3 dB) of electromagnetic waves from 1.78GHz to 1.82GHz, and can realize transmission of wireless communication signals and is insensitive to polarization of signal electromagnetic waves as shown in figure 4.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (10)
1. A wireless communication microwave antenna, characterized by: the wireless communication microwave antenna is of a double-layer structure, the upper layer is a metal layer and is of an interdigital capacitor quadruple rotational symmetric structure, the lower layer is a dielectric layer, and the upper metal layer is stacked above the lower layer which is the dielectric layer.
2. A wireless communications microwave antenna as claimed in claim 1, wherein: the construction method of the four-fold rotational symmetric structure of the interdigital capacitor comprises the following steps: rotating the interdigital zigzag capacitor structure around the head end of the interdigital zigzag capacitor structure for 3 times at intervals of 90 degrees to form a quadruple rotational symmetric structure; the head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital capacitor structure is a metal gap non-protruding end.
3. A wireless communications microwave antenna as claimed in claim 2, wherein: the material of the dielectric layer is selected from one of the following materials: polytetrafluoroethylene glass cloth copper foil plate F4B-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BK-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BM-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BMX-1/2, wide dielectric constant polytetrafluoroethylene glass cloth copper foil plate F4BME-1/2, ceramic powder filled polytetrafluoroethylene glass cloth copper foil plate F4BT-1/2, polytetrafluoroethylene glass cloth plane resistance copper foil laminated plate F4BDZ294, metal-based polytetrafluoroethylene glass cloth copper foil plate F4B-1/AI (al) (Cu) F4T-1/2, microwave composite medium copper foil substrate TP-1/2, novel microwave composite medium copper foil substrate TPH-1/2, Teflon glass cloth copper foil plate F4-1/AI (Al) (Cu) F4B-1/2, A polytetrafluoroethylene ceramic composite medium substrate TF-1/2 and polytetrafluoroethylene glass varnished cloth.
4. A wireless communications microwave antenna as claimed in claim 2, wherein: the value range of the width a of the metal gap of the interdigital capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width b of the metal strip of the interdigital capacitor structure is as follows: 0.30-1.25 (mm); the value range of the width c of the interdigital capacitor structure is as follows: 8 a +7 b (mm); the value range of the dimension d of the four-fold rotational symmetric structure of the interdigital capacitor is as follows: 15 a +14 b (mm).
5. A wireless communications microwave antenna as claimed in claim 2, wherein: the ratio d/lambda of the dimension d of the four-fold rotation symmetrical structure of the interdigital capacitor to the wavelength lambda of the microwave antenna is smaller than lambda/10.
6. A method for forming a wireless communication microwave antenna is characterized in that: the method comprises the following steps:
manufacturing an upper metal layer which is of an interdigital capacitance quadruple rotational symmetric structure;
manufacturing a lower dielectric layer, and stacking an upper metal layer above the lower dielectric layer;
the forming method of the upper metal layer comprises the following steps:
calculating the length of a gap of the microminiaturized wireless communication microwave antenna;
constructing an interdigital zigzag capacitor structure based on the gap length;
according to the interdigital zigzag capacitor structure, performing 3 rotations around the head end of the interdigital zigzag capacitor structure at intervals of 90 degrees to form a quadruple rotationally symmetrical interdigital capacitor structure of an upper metal layer;
and combining the upper metal layer and the lower dielectric layer to form the microwave antenna.
7. A method of forming a wireless communication microwave antenna according to claim 6, wherein: the specific method for calculating the slot length of the microminiaturized wireless communication microwave antenna comprises the following steps:
principle based on half-wave antenna resonance
n is the refractive index of the resonant mode, L is the length of the antenna, m is the order of the resonance, only considering the first-order resonance m as 1, when the wireless communication frequency is 800MHz-2.7GHz, the wavelength of the electromagnetic wave at the moment is 111-375mm, and the antenna is calculated according to the formulaThe length of the slit of the wire ranges from 50mm to 190 mm.
8. A method of forming a wireless communication microwave antenna according to claim 6, wherein: the specific method for constructing the interdigital zigzag capacitor structure based on the gap length comprises the following steps:
and correspondingly converting the gap length of the antenna into a zigzag gap based on the calculated gap length of the microminiaturized wireless communication microwave antenna, and constructing an interdigital zigzag capacitor structure.
9. A method of forming a wireless communication microwave antenna according to claim 6, wherein: the specific method for combining the quadruple rotationally symmetric interdigital capacitor structure of the upper metal layer by rotating the interdigital capacitor structure for 3 times around the head end of the interdigital capacitor structure at intervals of 90 degrees comprises the following steps:
the constructed interdigital capacitor structure is clockwise rotated by 90 degrees, 180 degrees and 270 degrees by taking the head end of the interdigital capacitor structure as a rotation center, and finally the interdigital capacitor structure is combined into a quadruple rotationally symmetric interdigital capacitor structure of metal copper on the upper layer; the head end of the interdigital zigzag capacitor structure is a metal gap protruding end, and the tail end of the interdigital zigzag capacitor structure is a metal gap non-protruding end.
10. A method of forming a wireless communication microwave antenna according to claim 6, wherein: the microwave antenna is formed by combining the upper metal layer and the lower dielectric layer, and then the microwave antenna further comprises the following steps:
the microwave antenna formed by the microwave antenna is optimized by adjusting the dielectric constant of the dielectric layer;
and further optimizing the formed microwave antenna by adjusting the geometric parameters of the quadruple rotationally symmetric interdigital type zigzag capacitor structure.
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