WO2018201675A1

WO2018201675A1 - Resonance mode analysis method for dual-frequency slot antenna

Info

Publication number: WO2018201675A1
Application number: PCT/CN2017/107199
Authority: WO
Inventors: 彭彪; 邓力; 李书芳; 张贯京; 葛新科; 张红治
Original assignee: 深圳市景程信息科技有限公司
Priority date: 2017-05-05
Filing date: 2017-10-21
Publication date: 2018-11-08
Also published as: CN107196064A

Abstract

Disclosed in the present invention are a resonance mode analysis method for a dual-frequency slot antenna. The dual-frequency slot antenna comprises a multi-mode slot resonator. The multi-mode slot resonator consists of a folded slot resonator and a co-planar waveguide stepped impedance resonator. The multi-mode slot resonator has a structure having reflectional symmetry with respect to a symmetry axis. The resonance mode analysis method for a dual-frequency slot antenna of the present invention is based on the even and odd mode concept, and enables acquisition of the resonance frequency and resonance order of each resonance mode of the dual-frequency slot antenna by means of analyzing electric field distribution of a multi-mode slot resonator in the dual-frequency slot antenna. In addition, the dual-frequency slot antenna of the present invention has a small design size, simple manufacturing process, and low cost, and has a power feed to a multi-mode slot resonator via a co-planar waveguide, thereby achieving a dual-frequency function thereof.

Description

Resonance mode analysis method for dual-frequency slot antenna

Technical field

[0001] The present invention relates to the field of radio frequency microwave communication technologies, and in particular, to a resonant mode analysis method for a dual-frequency slot antenna.

Background technique

[0002] In the antenna design, if only a single resonant mode is used, only a single-frequency narrow-band antenna design can be realized, and a multi-frequency, wide-band antenna design can be realized by effectively utilizing multiple resonant modes. Antenna structures are generally complex, and designers often only rely on electromagnetic simulation software to optimize the various dimensional parameters of the antenna. At present, the commonly used antenna pattern analysis method is the feature model method, but the feature model method has high requirements on the designer's theoretical basis, and the effective operation of the simulation software is also an important basis for the feature model analysis. Therefore, the feature model method has certain difficulty. technical problem

[0003] The main object of the present invention is to provide a resonant mode analysis method for a dual-frequency slot antenna. Based on the odd-even mode principle, by analyzing the electric field distribution of the multi-mode slot resonator in the dual-frequency slot antenna, the dual-frequency can be analyzed. The resonant frequency and the resonant order of the respective resonant modes of the slot antenna.

Problem solution

Technical solution

[0004] In order to achieve the above object, the present invention provides a resonant mode analysis method for a dual-frequency slot antenna, the dual-frequency slot antenna including a multi-mode slot resonator, which is formed by a folded slot resonator and coplanar a waveguide stepped impedance resonator, the structure of the multimode slot resonator is symmetric about a symmetry axis a-a', and the resonance mode analysis method of the dual-frequency slot antenna includes:

[0005] The weak coupling excitation of the multimode slot resonator by using two excitation ports causes the multimode slot resonator to generate four resonant frequencies fFSLR0, fCSIR0, fCSIR1 and fFSLR2;

[0006] The equivalent circuit model under the even mode condition and the odd mode condition is obtained by decomposing the multimode slot resonator along the symmetry axis a-a' by the odd-even mode theory, wherein:

[0007] Under even mode conditions, the multimode slot resonator is equivalent to a crotch at the position of the axis of symmetry a-a', according to the fold The electric field distribution of the slot resonator along the fFSLRO is judged to be equivalent to the λλλ non-uniform transmission line resonator, and the fFSLRO is judged to be the basic resonance frequency of the folded slot resonator; according to the folded slot resonator at fFSLR2 The wavenumber of the electric field distribution along the line determines that fFSLR2 is the second-order high-order resonant frequency of the folded slot resonator;

[0008] Under the odd-mode condition, the multimode slot resonator is equivalent to a short circuit at the position of the symmetry axis a-a', and the coplanar waveguide step impedance is judged according to the electric field distribution along the fCSIRO of the coplanar waveguide step impedance resonator. The resonator is equivalent to a short-circuit λ/4 non-uniform transmission line resonator, and judges fCSIRO as the fundamental resonant frequency of the coplanar waveguide stepped impedance resonator; judging fCSIRl as coplanar according to the wave number of the electric field distribution of the folded slot resonator at fCSIR1 The first-order resonant frequency of the waveguide stepped impedance resonator.

[0009] Preferably, the dual-frequency slot antenna is etched on a dielectric substrate, and a metal layer is disposed on the upper surface of the dielectric substrate as a metal RF ground, and the coplanar waveguide stepped impedance resonator passes through a metal wire and a metal RF ground. Connected, and feeds the multimode slot resonator through a coplanar waveguide feed line with a τ-shaped structure at the end.

[0010] Preferably, the coplanar waveguide stepped impedance resonator is a part of the dielectric substrate surrounded by the folded slot resonator, and is connected to the metal by a metal wire having a width S1.

[0011] Preferably, the multimode slot resonator is connected with a first excitation port P1 and a second excitation port P2, and the first excitation port P1 and the second excitation port P2 are both microstrip feeders.

[0012] Preferably, the folded slot resonator is composed of a first slot line, two second slot lines, two third slot lines, two fourth slot lines, and two fifth slot lines, wherein One ends of the two second slot lines are vertically connected to form a right-angle U-shaped structure at both ends of the first slot line, wherein one end of one of the third slot lines and one end of one of the fifth slot lines are vertically connected therein Two ends of a fourth slot line form a collimating angle U-shaped structure, wherein one end of the other third slot line and one end of the other fifth slot line are vertically connected to each other in the other fourth slot line Both ends form a collimating angle u-shaped structure, and the other ends of the two third slot lines are vertically connected to the other ends of the two second slot lines.

[0013] Preferably, the two fourth slot lines of the folded slot resonator are located between the two second slot lines and are parallel to each other, and the two fourth slot lines are close to each other and are separated by a metal line, the first slot The line, the third slot line, and the fifth slot line are parallel to each other and the coplanar waveguide stepped impedance resonator is formed by a portion of the dielectric substrate isolation.

[0014] Preferably, a middle slot position of the first slot line of the folded slot resonator is provided with a sixth slot line in a downward direction, and one end of the sixth slot line is connected to a middle position of the first slot line, The other end of the six slot line is down Extend and connect to a long edge of the dielectric substrate.

[0015] Preferably, the coplanar waveguide feed line includes a first feed line and a second feed line, and one end of the second feed line is vertically connected to a middle position of the first feed line to form a T-shaped structure, and the first feed line is built in the In the first slot line of the slot resonator, the second feed line is built in the sixth slot line, and the coplanar waveguide feed line of the τ-shaped structure is fed to the multimode slot resonator.

Advantageous effects of the invention

Beneficial effect

Compared with the prior art, the resonant mode analysis method of the dual-frequency slot antenna of the present invention is based on the odd-even mode principle, and the double-frequency slot resonator in the dual-frequency slot antenna can be analyzed to analyze the electric field distribution. The resonant frequency and the resonant order of the respective resonant modes of the frequency slot antenna. In addition, the dual-frequency slot antenna of the present invention not only has a small design size, simple processing and low cost, but also utilizes a multi-mode slot resonator to feed through the coplanar waveguide, thereby realizing the dual-frequency characteristics of the antenna.

Brief description of the drawing

DRAWINGS

1 is a schematic view showing the overall structure and dimensions of a dual-frequency slot antenna according to the present invention;

2 is a schematic structural view of a multimode slot resonator in a dual-frequency slot antenna according to the present invention;

3 is a schematic structural view of a multimode slot resonator 幵 with a slot line; [0019] FIG.

4 is a schematic structural view of a coplanar waveguide feed line in a dual-frequency slot antenna according to the present invention;

[0021] FIG. 5 is a structural diagram of weak coupling excitation of a multimode slot resonator using a microstrip line;

6 is a schematic diagram of a transmission response of a multi-mode slot resonator subjected to a weakly coupled excitation feed weakly coupled excitation using a microstrip line; [0022] FIG.

7 is a schematic diagram of electric field distribution of a multimode slot resonator at four resonant frequencies 吋; [0023] FIG.

8 is a transmission line equivalent model of a folded slot resonator and a coplanar waveguide stepped impedance resonator, and an electric field distribution pattern along four resonance modes of a multimode resonator. [0024] FIG.

[0025] The objects, features, and advantages of the invention will be <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

BEST MODE FOR CARRYING OUT THE INVENTION BEST MODE FOR CARRYING OUT THE INVENTION

The specific embodiments, structures, features and functions of the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 is a schematic view showing the overall structure and dimensions of a dual-frequency slot antenna according to the present invention. In the present embodiment, the dual-frequency slot antenna proposed by the present invention comprises a multimode slot resonator comprising a folded slot resonator (FSLR) 1 and a coplanar waveguide stepped impedance resonator (CSIR). 2 composition, and the coplanar waveguide stepped impedance resonator 2 is connected to the metal RF ground 4 through a metal wire 5 having a width S1, through a coplanar waveguide feed line 3 having a T-shaped end (referred to as CPW feed line 3) To feed the multimode slot resonator, a dual band antenna can be implemented. The dual-frequency slot antenna is etched on the dielectric substrate 10. The upper surface of the dielectric substrate 10 is coated with a metal layer, such as a copper-clad metal layer as a metal RF ground 4 (the metal RF ground 4 in FIG. 1 is not The portion of the metal layer surrounded by the multimode slot resonator). The specific substrate type of the dielectric substrate 10 is a single-layer metal FR4 plate having a thickness of 1.6 m and a dielectric constant of 4.4.

Referring to FIG. 2, FIG. 2 is a schematic structural view of a multimode slot resonator in the dual-frequency slot antenna of the present invention.

In the present embodiment, the multimode slot resonator is composed of a folded slot resonator 1 and a coplanar waveguide stepped impedance resonator 2, and is bilaterally symmetric with respect to the axis center line of the multimode slot resonator. The folded slot resonator 1 includes a first slot line 21, two second slot lines 22, two third slot lines 23, two fourth slot lines 24, and two fifth slot lines 25. One ends of the two second slot lines 22 are vertically connected at both ends of the first slot line 21 to form a right-angle U-shaped structure, wherein one end of one of the third slot lines 23 and one end of one of the fifth slot lines 25 are perpendicular to each other. Connected to one end of one of the fourth groove lines 24 to form a collimating angle U-shaped structure, wherein one end of the other third groove line 23 and one end of the other fifth groove line 25 are vertically connected thereto. Both ends of a fourth slot line 24 form a collimating angle U-shaped structure, and the other ends of the two third slot lines 23 are vertically connected to the other ends of the two second slot lines 22, and the two fourth slot lines 24 are located. The two second slot lines 22 are parallel to each other, and the two fourth slot lines 24 are close to each other and are separated by a metal wire 5. The first slot line 21, the third slot line 23, and the fifth slot line 25 are parallel to each other and form a coplanar waveguide stepped impedance resonator 2 via a portion of the dielectric substrate 10. Since the multimode slot resonator is adjacent to the axis center line of the multimode slot resonator Therefore, the two collimating angle u-shaped structures are bilaterally symmetric with respect to the axis center line of the multimode slot resonator.

[0029] In the present embodiment, the right-angle U-shaped structure is defined such that two corners constituting the U-shape are right-angled and the two slot lines constituting the U-shape are equal in length (both of the second slot lines 22), and the collimation angle U The type structure is defined such that the two corners constituting the quasi-U shape are right angles and the lengths of the two slot lines constituting the quasi-U type are not equal (one slot line is the third slot line 23, and the other slot line is the fifth slot line 25). And the length of the third slot line 23 is greater than the fifth slot line 25). The slot lines are hollow slots that are provided on the dielectric substrate 10.

Referring to FIGS. 1 and 2, the length of the first groove line 21 is the sum of the length L3 of the two third groove lines 23 and the width S1 of the metal wire 5 (ie, 2XL3+S1), the first groove line The width of 21 is W1; the length of the second slot 22 is L 2 , the length of the third slot 23 is L3, the length of the fourth slot 24 is L4, and the length of the fifth slot 25 is L5, the second slot The width of the line 22, the third slot line 23, the fourth slot line 24, and the fifth slot line 25 are both W2; the inner spacing between the two fourth slot lines 24 is S0, and between the two fourth slot lines 24 The outer spacing is equal to the width of the metal wire 5, which is S1; the spacing between the first groove line 21 and the fifth groove line 25 is S2.

[0031] The coplanar waveguide stepped impedance resonator 2 is a portion of the dielectric substrate 10 surrounded by the folded slot resonator 1, and is connected to the metal RF ground 4 through a metal wire 5 having a width S1. The first slot line 21, the third slot line 2 3 and the fifth slot line 25 are parallel to each other and form a coplanar waveguide stepped impedance resonator 2 via a portion of the dielectric substrate 10.

Referring to FIG. 3, FIG. 3 is a schematic diagram showing the structure of a multimode slot resonator 幵 provided with a slot line in the dual-frequency slot antenna of the present invention. In this embodiment, the middle portion of the first slot line 21 of the folded slot resonator 1 is disposed with a sixth slot line 26 in a downward direction, and one end of the sixth slot line 26 is connected to the first slot line 21 The middle portion has the other end extending downward and connected to one long edge of the dielectric substrate 10. The sixth slot line 26 has a length of L 0+dl and a width of W0+2xd0.

Referring to FIG. 4, FIG. 4 is a schematic structural view of a coplanar waveguide feed line 3 in the dual-frequency slot antenna of the present invention.

In this embodiment, the coplanar waveguide feed line 3 has a T-shaped structure, and the coplanar waveguide feed line 3 includes a first feed line 31 and a second feed line 32, and one end of the second feed line 32 is vertically connected to the first feed line 31. Central location. The length of the first feed line 31 is the sum of the end lateral length L6 of the T-shaped structure and the width W0 of the second feed line 32 (ie, 2XL6+W0), and the width of the first feed line 31 is W6; the first feed line 31 and the The interval between the lower frames of one slot line 21 is dl; the length of the second feed line 32 is L0, and the width of the second feed line 32 is W0. The interval between the two frames of the second feed line 32 and the two frames of the sixth slot line 26 is d0 (both sides of the second feed line 32) The hollow gaps are all d0), and the lateral length of the coplanar waveguide feed line 3 of the T-shaped structure is L6. In the fabrication of the dual-frequency slot antenna 本 of the present invention, the first feed line 31 of the coplanar waveguide feed line 3 is placed directly in the first slot line 21 of the slot resonator 1 and the first feed line 31 and the first slot line 21 are placed at the bottom border. At a position where the interval is dl, the second feed line 32 of the CPW feed line 3 is placed directly on the sixth groove line 26 and the hollow gaps on both sides of the second feed line 32 are both at the center position of d0, thereby making the T shape The structured coplanar waveguide feed line 3 feeds the multimode slot resonator to implement the dual band slot antenna of the present invention.

[0034] Referring to FIG. 1, the dimensions of the preferred embodiment of the dual-frequency slot antenna of the present invention are as shown in Table 1 below:

[0035]

Table 1 Dimensions of a Preferred Embodiment of the Dual-Frequency Slot Antenna of the Present Invention

[] [Table 1]

[0037]

In the present embodiment, the length L of the dielectric substrate 10 is preferably 68.9 mm, and the width W is preferably 46 mm. The length L and the width W of the dielectric substrate 10 can also be selected according to the size of the antenna.

[0039] The dual-frequency slot antenna of the present invention not only has a small design size, simple processing, and low cost, but also utilizes a multi-mode slot resonator to feed through a coplanar waveguide, thereby realizing the dual-frequency characteristics of the antenna. The working frequency band of the dual-frequency slot antenna includes four resonant frequencies. The designer can adjust the resonant frequency of the antenna by adjusting different design size parameters, which can effectively adjust the center operating frequency and bandwidth characteristics of the antenna. Since the resonance mode of the analysis antenna is mainly to analyze the resonance mode of the multimode slot resonator, the following is based on the odd-even mode principle. By analyzing the electric field distribution of the multi-mode slot resonator in the dual-frequency slot antenna, the dual-frequency slot antenna can be analyzed. The resonant order and resonant frequency of each resonant mode.

[0040] As shown in FIG. 5, FIG. 5 is a structural diagram of weakly coupling excitation of a multimode slot resonator using a microstrip line. In In this embodiment, the multimode slot resonator is connected to two excitation ports PI and P2, and the first excitation port P1 and the second excitation port P2 are both microstrip feeders and are connected to the folding gap of the multimode slot resonator. The two left and right second slot lines 22 of the resonator 1 are adjacent to each other (i.e., may be connected to the left and right second slot lines 22, or may be in the vicinity of the left and right second slot lines 22). That is, the first excitation port P1 is connected to the vicinity of the second slot line 2 2 on the left side, and the second excitation port P2 is connected to the vicinity of the second slot line 22 on the right side. The invention utilizes a microstrip line to perform weak coupling excitation on the multimode slot resonator, so that the multimode slot resonator is constructed as a microstrip line weakly coupled excitation resonator. The present invention utilizes a microstrip line weakly coupled excitation method to analyze the resonant order of each resonant mode of a multimode slot resonator.

As shown in FIG. 6, FIG. 6 is a schematic diagram of transmission response after weakly coupled excitation feed weak coupling excitation of a multimode slot resonator by using a microstrip line. The simulation result of the transmission coefficient (S ₂₁ ) of the multimode slot resonator is shown in Fig. 6. It can be seen that the multimode slot resonator generates four resonance frequencies (f _FS L _R ., f cSIRO , f cSIR! , f

. In the present embodiment, the resonance order of each resonance mode is analyzed and judged by analyzing the electric field distribution of each resonance mode of the multimode slot resonator.

[0042] As shown in FIG. 7, FIG. 7 is a schematic diagram of electric field distribution of a multimode slot resonator at four resonance frequencies. Since the structure of the multimode slot resonator is bilaterally symmetric and the axis of symmetry is a-a', the multimode cavity resonator of the left and right symmetrical structure can be decomposed by the parity mode theory. In the even mode condition, the multimode slot resonator is equivalent to a chirp at the position of the axis of symmetry a-a'. Under the odd mode condition, the multimode slot resonator is equivalent at the position of the axis of symmetry a-a'. For the short circuit, it can be deduced that the equivalent model of the transmission line under the even mode condition and the odd mode condition of the folded slot resonator (FSLR) 1 and the coplanar waveguide stepped impedance resonator (CSIR) 2 are respectively as shown in Fig. 8(a). And (b) are shown on the left.

[0043] As shown in FIG. 8, FIG. 8 is a transmission line equivalent model of a folded slot resonator (FSLR) 1 and a coplanar waveguide stepped impedance resonator (CS IR) 2 and an electric field along the four resonant modes of the multimode resonator. distributed. According to the electric field distribution along the transmission line in Fig. 7, the electric field distribution along the four resonance modes can be obtained, as shown in the right side of (a) and (b) of Fig. 8, respectively, and the "minimum value" in Fig. 8. The marked points correspond to the region of the magnetic field density in FIG. 7 which is extremely small, that is, the "minimum" region.

[0044] The present invention provides a resonant mode analysis method for a dual-frequency slot antenna, the method comprising: performing weak coupling excitation on a multimode slot resonator by using two excitation ports composed of microstrip lines to generate a multimode slot resonator Four resonant frequencies f FSLRO ^s i CSIRO ^s f CSIRl and FSLR2; decomposed along the axis of symmetry a-a' by the theory of odd and even modes A multimode slot resonator is used to obtain an equivalent circuit model under even mode conditions and odd mode conditions; under even mode conditions, a multimode slot resonator is equivalent to a path at the position of the axis of symmetry a-a' According to the electric field distribution along the folded gap resonator (FSLR) 1 at fFSLRO, it can be judged that the folded-fold resonator (FSLR) 1 is equivalent to a λ/2 (half-wavelength) non-uniform transmission line resonator. And f _FS L _R . The fundamental resonant frequency of the folded slot resonator (FSLR) 1. The folding gap resonator (FSLR) 1 in ^ ₅₁ ^ along the electric _{field. 2} fractal Bobo, based f _FS L _R2 folded slot resonator (FSLR) second order high-order resonance frequency 1; in the odd mode conditions, multiple The mode slot resonator is equivalent to a short-circuit 吋 at the position of the symmetry axis a-a', according to the coplanar waveguide stepped impedance resonator (CSIR) 2 at f _CSIR . The electric field distribution along the line, it can be judged that the 吋 coplanar waveguide step impedance resonator (CSIR) 2 is equivalent to a short-circuit λ/4 (quarter-wavelength) non-uniform transmission line resonator, and fCSIRO is a coplanar waveguide step impedance resonator The basic resonant frequency of (CSIR) 2. According to the wave number distribution of the electric field along the folded slot resonator fCSIR1 at the folded slot resonator (FSLR) 1, it can be judged that f _CSIR1 is the first-order resonance frequency of the coplanar waveguide stepped impedance resonator (CSIR) 2.

[0045] The resonant mode analysis method of the dual-frequency slot antenna of the present invention is based on the odd-even mode principle. By analyzing the electric field distribution of the multi-mode slot resonator in the dual-frequency slot antenna, the resonant modes of the dual-frequency slot antenna can be analyzed. The resonant frequency and the resonance order reduce the theoretical basis requirements of the designer, and the same reduces the effective operation requirements of the simulation software, and has the promotion significance and practical value.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent function changes made by the description of the present invention and the contents of the drawings, or directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Industrial applicability

Claims

Claim

[Claim 1] A resonance mode analysis method for a dual-frequency slot antenna, wherein the dual-frequency slot antenna includes a multi-mode slot resonator including a folded slot resonator and a coplanar waveguide step The impedance resonator is composed of a structure of the multimode slot resonator symmetrically about a symmetry axis a-a', and the resonance mode analysis method of the dual-frequency slot antenna comprises: weakly coupling the multimode slot resonator by using two excitation ports Excitation causes the multimode slot resonator to generate four resonant frequencies fFSLR0, fCSIR0, fCSIR1 and fFSLR2; decompose the multimode slot resonator along the axis of symmetry a-a' by the odd-even mode theory to obtain the conditions under even mode and odd mode The equivalent circuit model, where: Under the even mode condition, the multimode slot resonator is equivalent to the crotch at the position of the symmetry axis a-a', and the folding gap is judged according to the electric field distribution along the folded slot resonator at fFSLRO. The resonator is equivalent to a λλλ non-uniform transmission line resonator, and judges fFSLRO as the basic resonance frequency of the folded slot resonator; The wavenumber of the electric field distribution of the resonator along the fFSLR2 determines that fFSLR2 is the second-order high-order resonant frequency of the folded slot resonator; under the odd-mode condition, the multimode slot resonator is equivalent to the short circuit at the position of the axis of symmetry aa'. According to the electric field distribution along the fCSIRO of the coplanar waveguide stepped impedance resonator, it is judged that the coplanar waveguide stepped impedance resonator is equivalent to the short-circuit λ/4 non-uniform transmission line resonator, and the fCSIRO is judged to be the fundamental resonance of the coplanar waveguide stepped impedance resonator. Frequency; According to the wave number of the electric field distribution along the folded gap resonator at fCSIR1, it is judged that fCSI R1 is the first-order resonance frequency of the coplanar waveguide step impedance resonator.

[Claim 2] The resonance mode analysis method of the dual-frequency slot antenna according to claim 1, characterized in that

The dual-frequency slot antenna is etched on the dielectric substrate, and the upper surface of the dielectric substrate is coated with a metal layer as a metal RF ground, and the coplanar waveguide stepped impedance resonator is connected to the metal by a metal wire, and passes through a metal A coplanar waveguide feed line with a T-shaped end feeds the multimode slot resonator.

[Claim 3] The resonance mode analysis method of the dual-frequency slot antenna according to claim 2, characterized in that

The coplanar waveguide stepped impedance resonator is a portion of the dielectric substrate surrounded by the folded slot resonator, and is connected to the metal by a metal wire having a width S1.

[Claim 4] The resonance mode analysis method of the dual-frequency slot antenna according to claim 1, characterized in that The multi-mode slot resonator is connected to the first excitation port P1 and the second excitation port P2, and the first excitation port P1 and the second excitation port P2 are both microstrip feeders.

[Claim 5] The resonance mode analysis method of the dual-frequency slot antenna according to claim 1, characterized in that

The folded slot resonator is composed of a first slot line, two second slot lines, two third slot lines, two fourth slot lines, and two fifth slot lines, wherein the two second lines One end of the slot line is vertically connected at each end of the first slot line to form a right-angle U-shaped structure, wherein one end of one of the third slot lines and one end of one of the fifth slot lines are vertically connected to one of the fourth slots The two ends of the line form a collimating angle U-shaped structure, wherein one end of the other third slot line and one end of the other fifth slot line are vertically connected to each other at one end of the other fourth slot line. The collimating angle U-shaped structure, the other ends of the two third slot lines are vertically connected to the other ends of the two second slot lines.

[Claim 6] The resonance mode analysis method of the dual-frequency slot antenna according to claim 5, characterized in that

The two fourth slot lines of the folded slot resonator are located between the two second slot lines and are parallel to each other, and the two fourth slot lines are close to each other and separated by a metal line, the first slot line and the third slot The line and the fifth groove line are parallel to each other and the coplanar waveguide step impedance resonator is formed by a portion of the dielectric substrate barrier.

[Claim 7] The resonance mode analysis method of the dual-frequency slot antenna according to claim 5, characterized in that

a middle slot of the first slot line of the folded slot resonator is disposed with a sixth slot line in a downward direction, and one end of the sixth slot line is connected to a middle position of the first slot line, and the sixth slot line is further One end extends downward and is connected to one long edge of the dielectric substrate.

[Claim 8] A resonance mode analysis method for a dual-frequency slot antenna according to claim 7, wherein

The coplanar waveguide feed line includes a first feed line and a second feed line, and one end of the second feed line is vertically connected to a middle position of the first feed line to form a T-shaped structure, and the first feed line is built in the slot resonator In the first slot line, the second feed line is built in the sixth slot line, and the T-shaped structure coplanar waveguide feed line is fed to the multimode slot resonator.