CN113346231B - Antenna and wearable equipment - Google Patents
Antenna and wearable equipment Download PDFInfo
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- CN113346231B CN113346231B CN202110599205.6A CN202110599205A CN113346231B CN 113346231 B CN113346231 B CN 113346231B CN 202110599205 A CN202110599205 A CN 202110599205A CN 113346231 B CN113346231 B CN 113346231B
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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
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The invention discloses an antenna and wearable equipment, which comprises a medium substrate, a radiation patch, a feeder line and a ground patch, wherein the radiation patch, the feeder line and the ground patch are all arranged on the front surface of the medium substrate, the feeder line is connected with the radiation patch, a certain gap is reserved between the ground patch and the radiation patch as well as between the ground patch and the feeder line, and the radiation patch is used for generating a working frequency band covering UWB under the combined action of the radiation patch and the ground patch under the feeding excitation of the feeder line. It can be seen that the radiation patch and the ground patch of the present application are on the same plane, and the bandwidth of the antenna is widened by designing the overall structure of the radiation patch, the ground patch and the gaps between different patches (the influence of the gaps between different patches on the bandwidth of the antenna is large).
Description
Technical Field
The invention relates to the field of ultra-wideband antennas, in particular to an antenna and wearable equipment.
Background
The existing antenna comprises a dielectric substrate, a radiation patch, a ground patch and a feeder line connected with the radiation patch; the radiation patch is arranged on the front surface of the dielectric substrate, and the grounding patch is arranged on the back surface of the dielectric substrate. Under the existing antenna structure, there are many bandwidth widening modes of the antenna, and the common modes include: 1) The bandwidth of the antenna is widened by slotting the radiation patch; 2) The bandwidth of the antenna is widened by adding a metal structure or a short circuit design on the back of the dielectric substrate. However, the antenna designed by these methods has a complex structure, is not easy to process, and most antennas cannot cover the Ultra Wide Band (UWB) Band (3.1-10.6 GHz) frequency Band, and have a narrow application range.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an antenna and wearable equipment, wherein a radiation patch and a ground patch are on the same plane, the bandwidth of the antenna is widened by designing the radiation patch, the ground patch and the overall structure of gaps among different patches (the influence of the gaps among different patches on the bandwidth of the antenna is large).
To solve the above technical problem, the present invention provides an antenna, including:
a dielectric substrate;
the radiation patch is arranged on the front surface of the dielectric substrate;
the feeder line is arranged on the front surface of the dielectric substrate and connected with the radiation patch;
the grounding patch is arranged on the front surface of the medium substrate, and a certain gap is reserved between the grounding patch and the radiation patch as well as between the grounding patch and the feeder line;
the radiation patch is used for generating an operation frequency band covering UWB under the combined action of the feed excitation of the feed line and the grounding patch.
Preferably, the radiation patch includes:
a primary radiating patch; the main radiation patch is a circular radiation patch.
Preferably, the radiation patch further includes:
the secondary radiation patch is connected with the main radiation patch and used for increasing the current path of the main radiation patch so that the main radiation patch and the grounding patch generate an ultra-wideband frequency band covering UWB;
the secondary radiation patch is an extension radiation patch extending from one section of circular arc section of the circular radiation patch.
Preferably, the center of the circle of the circular radiation patch is located on the asymmetric axis of the dielectric substrate.
Preferably, the extension radiation patch is connected between the circular radiation patch and the first long edge of the dielectric substrate; the first long edge is a long edge on which the dielectric substrate and the circular radiation patch are close to each other.
Preferably, the feed line is connected between the circular radiation patch and the first short side of the dielectric substrate; the first short edge is a short edge of the dielectric substrate close to the circular radiation patch.
Preferably, the ground patch includes:
the first rectangular grounding patch is positioned on one side of the feeder line, and a certain gap is reserved between the first rectangular grounding patch and the feeder line;
the second rectangular grounding patch is positioned on the other side of the feeder line, and a certain gap is reserved between the second rectangular grounding patch and the feeder line;
the third grounding patch is positioned between the circular radiation patch and the second long edge of the medium substrate, and a certain gap is reserved between the third grounding patch and the circular radiation patch; the third ground patch is connected with the second rectangular ground patch, and the second long side is a long side far away from the dielectric substrate and the circular radiation patch;
a fourth rectangular grounding patch is positioned between the circular radiation patch and the second short edge of the dielectric substrate, and a certain gap is reserved between the fourth rectangular grounding patch and the circular radiation patch; the fourth rectangular ground patch is connected with the third ground patch, and the second short side is a short side of the dielectric substrate far away from the circular radiation patch.
Preferably, the dielectric substrate is a flexible dielectric substrate.
In order to solve the technical problem, the invention further provides wearable equipment comprising any one of the antennas.
Preferably, the wearable device is a smart watch or VR glasses.
The invention provides an antenna which comprises a medium substrate, a radiation patch, a feeder line and a ground patch, wherein the radiation patch, the feeder line and the ground patch are all arranged on the front surface of the medium substrate, the feeder line is connected with the radiation patch, a certain gap is reserved between the ground patch and the radiation patch as well as between the ground patch and the feeder line, and the radiation patch is used for generating a working frequency band covering UWB under the combined action of the radiation patch and the ground patch under the feeding excitation of the feeder line. It can be seen that the radiation patch and the ground patch of the present application are on the same plane, and the bandwidth of the antenna is widened by designing the overall structure of the radiation patch, the ground patch and the gaps between different patches (the influence of the gaps between different patches on the bandwidth of the antenna is large).
The invention also provides wearable equipment which has the same beneficial effect as the antenna.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present invention;
fig. 2 is an exploded schematic view of a radiation patch and a ground patch according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reference antenna according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a dimensional parameter of an antenna according to an embodiment of the present invention;
fig. 5 is an antenna current distribution diagram of a reference antenna according to an embodiment of the present invention;
FIG. 6 is a diagram of the current distribution of an improved antenna at 6.14GHz resonance according to an embodiment of the present invention;
FIG. 7 is a diagram of the current distribution of an improved antenna at the resonant 7.81GHz according to an embodiment of the present invention;
FIG. 8 is a diagram of the current distribution of an improved antenna at the resonant 9.7GHz frequency according to an embodiment of the present invention;
FIG. 9 is a graph comparing the reflection coefficients of a reference antenna and an improved antenna according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating the efficiency of an improved antenna according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide an antenna and wearable equipment, wherein a radiation patch and a ground patch are on the same plane, and the bandwidth of the antenna is widened by designing the radiation patch, the ground patch and the overall structure of gaps among different patches (the influence of the gaps among different patches on the bandwidth of the antenna is large).
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present invention.
The antenna includes:
a dielectric substrate 1;
the radiation patch 2 is arranged on the front surface of the dielectric substrate 1;
a feeder line 3 arranged on the front surface of the dielectric substrate 1 and connected with the radiation patch 2;
the grounding patch 4 is arranged on the front surface of the dielectric substrate 1, and a certain gap is reserved between the grounding patch and the radiation patch 2 as well as between the grounding patch and the feeder line 3;
the radiation patch 2 is used for generating an operating frequency band covering UWB under the combined action of the feed excitation of the feed line 3 and the grounding patch 4.
Specifically, the antenna of this application includes dielectric substrate 1, radiation patch 2, feeder 3 and ground patch 4, and its theory of operation is:
the antenna of the application adopts two-layer structure to constitute, and wherein one deck structure is insulating dielectric substrate 1, and another layer structure includes radiation paster 2, feeder 3 and ground patch 4. Specifically, the radiation patch 2, the feeder line 3, and the ground patch 4 are all laid on the front surface of the dielectric substrate 1, the radiation patch 2, the feeder line 3, and the ground patch 4 are all metal patches, and the materials of the three are generally made of a metal material with good conductivity and low cost, such as copper, wherein the radiation patch 2 is connected with the feeder line 3, the ground patch 4 is Grounded (GND) and certain gaps are left between the ground patch 4 and the radiation patch 2 as well as between the ground patch 4 and the feeder line 3 (namely, the ground patch 4 and the radiation patch 2 and the feeder line 3 do not have an overlapped structure).
It can be understood that the structure of the radiation patch 2, the structure of the ground patch 4, and the structure of the gap left between the ground patch 4 and the radiation patch 2 and the power feed line 3 all affect the bandwidth of the antenna (the structure of the gap left between the ground patch 4 and the radiation patch 2 and the power feed line 3 greatly affects the bandwidth of the antenna), so that the present application can widen the bandwidth of the antenna by adjusting the overall structure composed of the radiation patch 2, the ground patch 4, and the gap left between the ground patch 4 and the radiation patch 2 and the power feed line 3. It should be noted that, with the antenna structure of the present application, by adjusting the overall structure of the antenna, it is possible to realize: under the combined action of the whole structure of the antenna, a bandwidth enough to cover a UWB frequency band is generated, specifically, the radiation patch 2 and the grounding patch 4 are combined to generate an operating frequency band covering the UWB under the feeding excitation of the feeder line 3, thereby realizing the design of the ultra-wideband antenna.
In antenna applications, the antenna is typically attached to an inner surface of a device for use. If the device is a sending device, the device can transmit radio frequency energy to the radiation patch 2 through the feeder line 3 and emit the radio frequency energy from the radiation patch 2; if the device is a receiving device, the device can receive radio frequency energy transmitted from the outside through the radiation patch 2 and transmit the radio frequency energy to the inside of the device for processing by the feeder 3.
It can be seen that the radiation patch and the ground patch of the present application are on the same plane (the radiation patch and the ground antenna structure on the same plane are coplanar waveguide (CPW) antennas), and the bandwidth of the antenna is widened by designing the overall structure of the gap between the radiation patch, the ground patch and different patches (the gap between different patches has a large influence on the bandwidth of the antenna).
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is an exploded schematic view of a radiation patch and a ground patch according to an embodiment of the present invention.
As an alternative embodiment, the radiation patch 2 includes:
a primary radiating patch; the main radiating patch is a circular radiating patch 21.
Specifically, the radiation patch 2 of the present application includes a main radiation patch that generates a certain broadband frequency band in combination with a ground patch. More specifically, the main radiating patch is generally a single structure, such as the circular radiating patch 21, which is convenient for manufacturing.
As an alternative embodiment, the radiation patch 2 further includes:
the secondary radiation patch is connected with the main radiation patch and used for increasing a current path of the main radiation patch so that the main radiation patch is combined with the grounding patch to generate an ultra-wideband frequency band covering UWB;
the radiation patch is an extended radiation patch 22 extending from one of the circular arc segments of the circular radiation patch 21.
Further, the radiation patch 2 of the present application further includes a secondary radiation patch, and the working principle thereof is as follows:
the main radiation patch is usually a single structure (as shown in fig. 3, the main radiation patch is a single circular radiation patch), which causes that the current path of the main radiation patch may not be large enough, which is not beneficial to the reduction of the antenna resonant frequency, thereby increasing the design difficulty of the antenna generating the bandwidth enough to cover the UWB frequency band, so the application sets the main radiation patch and the auxiliary radiation patch simultaneously, compared with the main radiation patch with a single structure, the current path of the whole radiation patch structure formed by the auxiliary radiation patch and the main radiation patch is large, which is beneficial to the reduction of the antenna resonant frequency, thereby facilitating the radiation patch 2 to generate the ultra wide band frequency band enough to cover the UWB by combining the ground patch 4.
More specifically, the radiating patch of the present application is an extended radiating patch 22 extending from one of the circular arc segments of the circular radiating patch 21, so that the current path of the circular radiating patch 21 is increased, which is beneficial to reducing the resonant frequency of the antenna. It should be noted that one of the circular arc segments of the circular radiation patch 21 refers to a part of the circular arc segment on the circular radiation patch 21, and the part of the circular arc segment is selected at a specific position of the circular radiation patch 21.
As an alternative embodiment, the center of the circular radiation patch 21 is located on the asymmetric axis of the dielectric substrate 1.
Specifically, the dielectric substrate 1 is generally a rectangular dielectric substrate having a certain thickness in structure, as shown in fig. 2, the upper side edge and the lower side edge of the rectangular dielectric substrate are two short sides of the rectangular dielectric substrate, and the left side edge and the right side edge of the rectangular dielectric substrate are two long sides of the rectangular dielectric substrate.
For the design of the position of the circular radiation patch 21, it is generally easy to think of designing the circular radiation patch as: the circular radiating patch is symmetrical about two long sides of the rectangular dielectric substrate (referred to as a first circular radiating patch), and the application designs the circular radiating patch as: the center of the circular radiation patch is located on the asymmetric axis of the rectangular dielectric substrate, and according to the placement position shown in fig. 2, the center of the circular radiation patch is located below and to the left of the center of the rectangular dielectric substrate (referred to as a second circular radiation patch). This is so designed because: it is known through tests that, under the same size, the antenna bandwidth range of the first circular radiation patch without the second circular radiation patch is large, that is, if the circular radiation patch is set to be symmetrical about two long sides of the rectangular dielectric substrate, a larger area of the circular radiation patch needs to be set to achieve the same antenna bandwidth range as the second circular radiation patch, which results in a larger antenna size and is not beneficial to circuit integration.
As an alternative embodiment, the extended radiation patch 22 is connected between the circular radiation patch 21 and the first long side of the dielectric substrate 1; wherein, the first long side is the long side of the dielectric substrate 1 close to the circular radiation patch 21.
Specifically, the edge of the circular radiation patch 21 of the present application is not in contact with two short sides of the rectangular dielectric substrate, and two long sides are not in contact, the extension radiation patch 22 is connected between the circular radiation patch 21 and the first long side of the dielectric substrate 1 (the long side where the dielectric substrate 1 and the circular radiation patch 21 are close to), according to the placement position of fig. 2, the extension radiation patch 22 is located on the left side of the circular radiation patch 21, specifically, the center of the extension radiation patch 22 may be located above the left of the center of the circle of the circular radiation patch 21, the upper and lower edges of the extension radiation patch 22 are parallel to the short sides of the rectangular dielectric substrate, the right edge of the extension radiation patch 22 is tightly connected to the preset arc segment of the circular radiation patch 21, the left edge of the extension radiation patch 22 coincides with the long side of the rectangular dielectric substrate on the left side (the coincidence indicates that all points on the short line segment are on the long line segment), and this position design of the extension radiation patch 22 is favorable for widening the bandwidth of the antenna.
As an alternative embodiment, the feeder line 3 is connected between the circular radiation patch 21 and the first short side of the dielectric substrate 1; wherein, the first short side is the short side of the dielectric substrate 1 close to the circular radiation patch 21.
Specifically, the feed line 3 of the present application is connected between the circular radiation patch 21 and the first short side of the dielectric substrate 1 (the short side of the dielectric substrate 1 close to the circular radiation patch 21), according to the placement position of fig. 2, the feed line 3 is located at the lower side of the circular radiation patch 21, specifically, the center of the feed line 3 is located at the lower right side of the center of the circular radiation patch 21, the left and right edges of the feed line 3 are parallel to the long side of the rectangular dielectric substrate, the upper edge of the feed line 3 is tightly connected with the preset arc section of the circular radiation patch 21, the lower edge of the feed line 3 coincides with the lower short side of the rectangular dielectric substrate, and the position design of the feed line 3 is favorable for widening the antenna bandwidth.
As an alternative embodiment, the ground patch 4 includes:
a first rectangular ground patch 41 located on one side of the feeder line 3 with a certain gap left between it and the feeder line 3;
a second rectangular ground patch 42 located on the other side of the feeder line 3 with a gap left between it and the feeder line 3;
a third ground patch 43 located between the circular radiation patch 21 and the second long side of the dielectric substrate 1 and having a gap with the circular radiation patch 21; the third ground patch 43 is connected to the second rectangular ground patch 42, and the second long side is the long side where the dielectric substrate 1 and the circular radiation patch 21 are far away from each other;
a fourth rectangular ground patch 44 is positioned between the circular radiation patch 21 and the second short side of the dielectric substrate 1, and a certain gap is reserved between the fourth rectangular ground patch and the circular radiation patch 21; wherein, the fourth rectangular ground patch 44 is connected to the third ground patch 43, and the second short side is the short side of the dielectric substrate 1 far away from the circular radiation patch 21.
Specifically, the ground patch 4 of the present application includes a first rectangular ground patch 41, a second rectangular ground patch 42, a third ground patch 43, and a fourth rectangular ground patch 44, and its working principle is:
for the design of the structure of the ground patch 4, it is usually easy to think of the structure of the ground patch shown in fig. 3, but the ground patch shown in fig. 3 has a small ground area and only has a gap structure with the feed line, which is not beneficial to widening the bandwidth of the antenna.
The structure of the ground patch 4 of the present application adopts the structure of the ground patch as shown in fig. 2, specifically, the ground patch 4 is divided into four parts, the first part is a first rectangular ground patch 41 which is located on one side of the feed line 3 and has a certain gap with the feed line 3, according to the placement position of fig. 2, the first rectangular ground patch 41 is located on the left side of the feed line 3, the long side of the lower side of the first rectangular ground patch 41 coincides with the short side of the lower side of the rectangular dielectric substrate, the short side of the left side of the first rectangular ground patch 41 coincides with the long side of the left side of the rectangular dielectric substrate, and a certain gap is left between the short side of the right side of the first rectangular ground patch 41 and the left side of the feed line 3; the second part is a second rectangular ground patch 42 which is positioned on the other side of the feed line 3 and has a certain gap with the feed line 3, according to the arrangement position of fig. 2, the second rectangular ground patch 42 is positioned on the right side of the feed line 3, the long side of the lower side of the second rectangular ground patch 42 is overlapped with the short side of the lower side of the rectangular dielectric substrate, the short side of the right side of the second rectangular ground patch 42 is overlapped with the long side of the right side of the rectangular dielectric substrate, and a certain gap is left between the short side of the left side of the second rectangular ground patch 42 and the right side of the feed line 3; the third part is a third ground patch 43 which is positioned between the circular radiation patch 21 and the second long side of the dielectric substrate 1 (the long side of the dielectric substrate 1 far away from the circular radiation patch 21) and has a certain gap with the circular radiation patch 21, the third ground patch 43 is connected with the second rectangular ground patch 42, according to the arrangement position of fig. 2, the third ground patch 43 is positioned at the right side of the circular radiation patch 21, the lower side edge of the third ground patch 43 is overlapped with the upper side long side of the second rectangular ground patch 42 (actually, the lengths of the two are the same and are the same line segment), the right side edge of the third ground patch 43 is overlapped with the right side long side of the rectangular dielectric substrate, the left side edge of the third ground patch 43 is an arc, and a certain gap is left between the left side arc edge of the third ground patch 43 and the circular radiation patch 21; the fourth part is a fourth rectangular ground patch 44 which is located between the circular radiation patch 21 and the second short side of the medium substrate 1 (the short side of the medium substrate 1 far from the circular radiation patch 21) and has a certain gap with the circular radiation patch 21, the fourth rectangular ground patch 44 is connected with the third ground patch 43, according to the arrangement position shown in fig. 2, the fourth rectangular ground patch 44 is located on the upper side of the third ground patch 43, the upper long side of the fourth rectangular ground patch 44 is overlapped with the upper short side of the rectangular medium substrate, the left short side of the fourth rectangular ground patch 44 is overlapped with the left long side of the rectangular medium substrate, the right short side of the fourth rectangular ground patch 44 is overlapped with the right long side of the rectangular medium substrate, the lower long side of the fourth rectangular ground patch 44 is overlapped with the upper edge of the third ground patch 43, the upper edge of the third ground patch 43 is parallel to the upper vertex tangent line of the circular radiation patch 21, and a certain gap is left between the upper edge of the third ground patch 43 and the upper vertex tangent line of the circular radiation patch 21.
It can be seen that, under the condition that the overall size of the antenna is the same (the size of the dielectric substrate is the same), compared with the ground patch shown in fig. 3, the ground patch 4 of the present application has a large area, and increases the gap structure between the circular radiation patch 21 and the ground, so that the current can be intensively distributed in the gap, which plays a role of increasing resonance, thereby widening the bandwidth of the antenna, and facilitating the realization of enabling the bandwidth of the antenna to completely cover the UWB frequency band.
As an alternative embodiment, the dielectric substrate 1 is a flexible dielectric substrate.
Specifically, select for use to the material of medium base plate 1, generally select for use hard material at present, but hard material is unfavorable for antenna mounting in small-size equipment, and the material of medium base plate 1 of this application is thinner flexible material, has advantages such as flexible, small, does benefit to antenna mounting in small-size equipment, like in the wearable equipment of miniaturization such as intelligent wrist-watch, VR (Virtual Reality) glasses, can attach in the equipment internal surface.
Based on this, the antenna dimension parameters of the present application can be specifically (refer to fig. 4 and table 1 below):
TABLE 1
Wherein Wg is the width of the dielectric substrate; lg is the length of the dielectric substrate; hsub is the thickness of the dielectric substrate; s is the length from the right vertex of the circular radiation patch to the left edge of the dielectric substrate; w is the width of the extended radiating patch; g0 is the gap width between the feeder and the ground; g1 is the width of a gap between the circular radiation patch and the ground; wf is the width of the feed line; r is the radius length of the circular radiation patch; h is the length of the upper vertex of the circular radiating patch from the lower side edge of the dielectric substrate.
The current distribution analysis was performed for the reference antenna shown in fig. 3 and the modified antenna shown in fig. 4: as can be seen from fig. 5, the current of the reference antenna is mainly distributed around the gap between the feed line and ground; while the modified antenna changes the distribution of the current by enlarging the ground of the antenna, as shown in fig. 6-8, after the modified antenna enlarges the ground, the antenna current at the resonance 6.14GHz is mainly distributed around the gap between the feed line and the ground, and the current around the circular radiating patch gradually increases as the resonance frequency increases. Comparing the current distribution diagrams of the reference antenna and the improved antenna, the improved antenna enlarges the ground and increases the extending radiation patch, so the current distribution path around the circular radiation patch and the extending radiation patch is increased, the resonance frequency of the antenna is reduced, and the bandwidth of the antenna is widened.
The antenna specifically uses a polyimide flexible material as a dielectric substrate, the dielectric constant ∈ r =3.5 of the dielectric substrate, the loss tangent tan δ =0.002 of the dielectric substrate, and the antenna size parameters shown in fig. 4 are combined to analyze the antenna reflection coefficient and the antenna efficiency of the improved antenna: as can be seen from FIG. 9, the bandwidth of the modified antenna is 2.73GHz-10.67GHz at-10 dB, covering the UWB band, while the reference antenna does not cover the UWB band at-10 dB. As can be seen from fig. 10, the efficiency of the improved antenna in the UWB band is 85% or more.
In summary, the present application proposes a slot antenna of coplanar waveguide structure, the antenna is fed by a microstrip line with width wf, and the overall size is 25 × 32 × 0.02mm 3 The antenna is small in size, bendable and suitable for wearable equipment, the working frequency band of the antenna can cover the UWB frequency band, the directional diagram is omnidirectional, and the maximum gain is 6.55dBi.
The application also provides a wearable device comprising any one of the antennas.
As an alternative embodiment, the wearable device is a smart watch or VR glasses.
Please refer to the above embodiments for the introduction of the wearable device provided by the present application, which is not described herein again.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An antenna, comprising:
a dielectric substrate;
the radiation patch is arranged on the front surface of the dielectric substrate;
the feeder line is arranged on the front surface of the dielectric substrate and connected with the radiation patch;
the grounding patch is arranged on the front surface of the dielectric substrate, and a certain gap is reserved between the grounding patch and the radiation patch as well as between the grounding patch and the feeder line;
the radiation patch is used for generating an operating frequency band covering UWB under the combined action of the feed excitation of the feed line and the grounding patch;
wherein the radiation patch includes:
a main radiating patch; the main radiation patch is a circular radiation patch;
the feeder line is connected between the circular radiation patch and the first short side of the medium substrate; the first short edge is a short edge of the dielectric substrate close to the circular radiation patch;
the ground patch includes:
the first rectangular grounding patch is positioned on one side of the feeder line, and a certain gap is reserved between the first rectangular grounding patch and the feeder line;
the second rectangular grounding patch is positioned on the other side of the feeder line, and a certain gap is reserved between the second rectangular grounding patch and the feeder line;
the third grounding patch is positioned between the circular radiation patch and the second long edge of the medium substrate, and a certain gap is reserved between the third grounding patch and the circular radiation patch; the third ground patch is connected with the second rectangular ground patch, and the second long side is a long side far away from the dielectric substrate and the circular radiation patch;
a fourth rectangular grounding patch is positioned between the circular radiation patch and the second short edge of the dielectric substrate, and a certain gap is reserved between the fourth rectangular grounding patch and the circular radiation patch; the fourth rectangular ground patch is connected with the third ground patch, and the second short side is the short side of the dielectric substrate far away from the circular radiation patch;
wherein the radiation patch further comprises:
the secondary radiation patch is connected with the main radiation patch and used for increasing the current path of the main radiation patch so that the main radiation patch and the grounding patch generate an ultra-wideband frequency band covering UWB;
the secondary radiation patch is an extended radiation patch extending from one of the circular arc sections of the circular radiation patch.
2. The antenna of claim 1, wherein the circular radiating patch has a center located on an axis of asymmetry of the dielectric substrate.
3. The antenna of claim 1, wherein the extended radiating patch is connected between the circular radiating patch and the first long side of the dielectric substrate; the first long edge is a long edge on which the dielectric substrate and the circular radiation patch are close to each other.
4. An antenna as claimed in any one of claims 1 to 3, wherein the dielectric substrate is a flexible dielectric substrate.
5. A wearable device, characterized in that it comprises an antenna according to any of claims 1-4.
6. The wearable device of claim 5, wherein the wearable device is a smart watch or VR glasses.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113871866A (en) * | 2021-09-07 | 2021-12-31 | 许昌许继软件技术有限公司 | PCB antenna |
| CN113991280B (en) * | 2021-09-30 | 2022-11-01 | 歌尔科技有限公司 | Intelligent wearable device antenna device and intelligent wearable device |
| CN113972487B (en) * | 2021-10-22 | 2023-12-26 | 歌尔科技有限公司 | Antenna and electronic equipment |
| CN114094326B (en) * | 2021-11-04 | 2024-07-05 | 天津大学 | UWB antenna gain improvement structure for WLAN applications |
| CN114336032B (en) * | 2022-01-13 | 2024-05-03 | 昆山睿翔讯通通信技术有限公司 | Broadband omnidirectional watch antenna |
| CN115101931B (en) * | 2022-07-25 | 2022-11-01 | 南京隼眼电子科技有限公司 | Antenna and radar apparatus |
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