WO2022166444A1

WO2022166444A1 - Antenna and terminal device

Info

Publication number: WO2022166444A1
Application number: PCT/CN2021/139882
Authority: WO
Inventors: 张晓璐; 张琛; 李肖峰; 秦江弘
Original assignee: 华为技术有限公司
Priority date: 2021-02-08
Filing date: 2021-12-21
Publication date: 2022-08-11
Also published as: CN114914665B; CN114914665A

Abstract

The present application provides an antenna and a terminal device, so as to broaden the operating frequency band of the terminal device. The antenna comprises a dielectric substrate, a radiator, a feed end and a grounding end, the radiator being provided on the dielectric substrate, and the radiator comprising a first branch, a second branch, a third branch and a fourth branch, wherein the first branch is in an open ring shape, and a head end of the first branch is electrically connected to the grounding end; a head end of the second branch is electrically connected to the feed end, and a tail end of the second branch is in coupling connection with a tail end of the first branch; a head end of the third branch is electrically connected to the feed end, and a tail end of the third branch is in coupling connection with the first branch; and a head end of the fourth branch is connected to the first branch, and a tail end of the fourth branch is grounded.

Description

An antenna and terminal equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number 202110172915.0 and the application title "An Antenna and Terminal Equipment" filed with the China Patent Office on February 08, 2021, the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the technical field of terminal equipment, and in particular, to an antenna and a terminal equipment.

Background technique

Customer Premise Equipment (CPE), as a wireless broadband access device, can convert the signal sent by the base station into a common WiFi signal for mobile terminals such as smartphones, tablet computers, and laptops, and can support multiple mobile terminals at the same time. Internet access to the terminal. At present, with the development of 5G technology, CPE products have increased the coverage requirements of the 0.6GHz frequency band. However, the existing Sub-3G antenna solutions only support the 0.7GHz to 0.9GHz frequency band, which cannot meet the frequency coverage requirements of the products. Based on this, how to widen the working frequency band of CPE products is a technical problem to be solved urgently at present.

SUMMARY OF THE INVENTION

The present application provides an antenna and terminal equipment, which are used to widen the working frequency band of the terminal equipment and improve the working performance of the terminal equipment.

In a first aspect, the present application provides an antenna, the antenna may include a dielectric substrate, a radiator, a feed end and a ground end, the radiator may be arranged on the dielectric substrate, and the radiator may receive and transmit radio frequency current through the feed end Signal. In specific settings, the radiator may include a first branch, a second branch, a third branch and a fourth branch, wherein the first branch may be in an open ring shape, and the head end of the first branch is electrically connected to the ground terminal The head end of the second branch can be electrically connected to the feed end, and the end of the second branch and the end of the first branch can be coupled and connected through a capacitive structure, so that the current signal on the second branch can be coupled to the first branch The head end of the third branch is electrically connected to the feeding terminal, and the end of the third branch and the first branch can also be coupled and connected through a capacitive structure, so as to realize the coupling and feeding of the first branch; the fourth branch The head end of the branch is electrically connected with the first branch, and the end of the fourth branch is grounded.

The antenna provided by the present application can generate four There are two working modes, which are the left and right-handed composite antenna modes formed by the mutual coupling between the end of the first branch and the end of the second branch, the 1/4λ mode from the fourth branch to the end of the first branch, and the third branch to the The 3/4 wavelength mode of the first branch excited by a branch feed, and the loop antenna pattern formed by the first branch and the second branch. Through the four working modes, the antenna can achieve continuous coverage in the 0.6GHz-0.96GHz frequency band and the 1.427GHz-1.517GHz frequency band, thereby broadening the working frequency band of the terminal equipment and improving the working performance of the terminal equipment.

The radiator can be formed on the dielectric substrate by printing, photolithography, etc., which can simplify the manufacturing process of the antenna. Alternatively, the radiator can also be formed by stamping, cutting, etc., and then bonded and fixed on the dielectric substrate. In addition, the dielectric substrate may be a rigid substrate, a flexible substrate, or a rigid-flex substrate.

In some possible implementations, the shape of the split ring of the first branch may be a rectangle, a circle, an oval, or some other regular or irregular shape, which may be set according to the shape of the dielectric substrate. This is not limited.

Taking the first branch as a rectangular open ring as an example, the first branch may include a first connecting part, a second connecting part, a third connecting part and a fourth connecting part connected in sequence, and the end of the first connecting part is connected to the first connecting part. The ends of the four connecting parts are spaced to form openings of the split ring. In this case, the end of the first connecting part can be formed as the head end of the first branch, and the end of the fourth connecting part can be formed as the first branch of the first branch. end. At this time, the first connection part and the third connection part are arranged in parallel, and the first connection part and the third connection part can respectively extend in the first direction; the second connection part and the fourth connection part are arranged in parallel, and the second connection part The fourth connecting portion may extend along the second direction respectively, and it should be understood that the second direction is different from the first direction. With this design, the shape of the first branch is relatively regular, which is beneficial to improve the structural compactness of the antenna.

In a specific embodiment, the second branch may extend along the second direction, and the end of the second branch may be located between the fourth connection part and the second connection part, so that the structure of the antenna can be more compact. The end section of the second branch and the end section of the fourth connection portion may be arranged in parallel and have a first gap, so that the current signal on the second branch can be coupled to the first branch through the first gap.

In another specific embodiment, the end of the second branch may also be located on the side of the fourth connecting part away from the second connecting part, and at this time, the end of the second branch and the end of the fourth connecting part may also be parallel A certain gap is set and formed, so that the current signal on the second branch can be coupled to the first branch through the gap.

In some possible implementations, a first protruding portion may be provided at a section of the end of the fourth connecting portion, and the first protruding portion may be located on a side of the fourth connecting portion facing the second branch. The first protruding part can adjust the impedance matching of the antenna, which is beneficial to obtain a higher gain of the antenna.

In some possible implementations, a segment of the end of the second branch may be provided with a second protruding portion, and the second protruding portion may be located on a side of the second branch facing away from the fourth connecting portion. Similarly, the second protruding portion can also adjust the impedance matching of the antenna, which is beneficial to obtain a higher gain of the antenna.

In some possible implementations, the third branch may be disposed between the second branch and the second connection part, which can make the structure of the antenna more compact, which is beneficial to reduce the space occupied by the antenna in the terminal device.

In a specific design, the third branch may include a first branch, a second branch, a third branch and a fourth branch connected in sequence, wherein the first branch is arranged along the first direction, and the first branch is located in the second branch close to the first branch. One side of the two connecting parts; the second branch extends along the second direction; the third branch extends along the first direction, and the third branch is located on the side of the second branch close to the second connecting part; the fourth branch extends along the second direction, There is a second gap between the fourth branch and the second connecting part, and a distributed capacitive coupling structure can be formed between the fourth branch and the second connecting part through the second gap, so that the current signal on the third branch can pass through the second gap. Two gaps are coupled to the first branch.

In some possible implementations, the midpoint of the fourth branch has a projection point on the side of the second connection portion facing the fourth connection portion, and the electrical length between the projection point and the first connection portion is the electrical length of the first branch node 1/3 of the length. With this design, the feed end feeds the RF current signal to the antenna at the head end of the third branch, and the end of the third branch couples and feeds the first branch near the projection point, thereby exciting the first branch 3/4λ mode.

In some possible implementations, the first branch, the second branch, and the third branch can all be disposed on the first surface of the dielectric substrate, which is beneficial to reduce the difficulty of positioning each branch on the dielectric substrate and simplify the manufacture of the antenna craft.

In some possible implementations, the fourth branch may be extended along the thickness direction of the dielectric substrate to reduce the cross-sectional area of the antenna in the direction perpendicular to the thickness of the dielectric substrate, so as to facilitate the installation of the antenna inside the terminal device.

In some possible implementations, the antenna generates a first resonance frequency through the first branch and the second branch; the antenna generates a second resonance frequency through the fourth branch and the first branch; the antenna generates a second resonance frequency through the fourth branch and the first branch; The third branch and the first branch generate a third resonance frequency; the antenna generates a fourth resonance frequency through the first branch and the second branch.

In a specific embodiment, the antenna generates a first resonance frequency in a left-handed composite mode in which the first branch and the second branch are coupled with each other, and the antenna is in a 1/4 wavelength mode from the fourth branch to the end of the first branch The second resonant frequency is generated, and the antenna generates the third resonance frequency in the 3/4 wavelength mode of the first branch excited by the coupling feed of the third branch, and the antenna is in the loop antenna mode formed by the first branch and the second branch. A fourth resonant frequency is generated.

The first resonant frequency is approximately 0.6GHz-0.7GHz, the second resonant frequency is approximately 0.7GHz-0.8GHz, the third resonant frequency is approximately 0.8GHz-0.96GHz, and the fourth resonant frequency is approximately 1.427GHz-1.517GHz. It can be seen that through the first three resonance modes, the antenna can achieve continuous coverage in the frequency band of 0.6GHz-0.96GHz, and through the fourth resonance mode, the antenna can achieve coverage in the frequency band of 1.427GHz-1.517GHz, which in turn can widen the terminal. The working frequency band of the equipment can improve the working performance of the terminal equipment.

In a second aspect, the present application also provides a terminal device, the terminal device includes a circuit board, a feeding transmission line, and an antenna in any of the foregoing possible embodiments, wherein a radio frequency transceiver circuit is provided on the circuit board, and a radiator can It is electrically connected with the radio frequency transceiver circuit through the feeder transmission line, so that the current energy fed into the antenna by the radio frequency transceiver circuit through the feeder transmission line is converted into electromagnetic energy and radiated out, and the electromagnetic energy received by the antenna is converted into current energy and transmitted through the feeder transmission line To the radio frequency transceiver circuit, so that the terminal equipment realizes the signal transceiver function. The terminal device can transmit and receive signals in a relatively wide working frequency band, and can be suitable for multi-purpose application scenarios.

In some possible implementations, the circuit board may be a multi-layer board. In the multi-layer structure of the circuit board, one or more ground layers may be included. Specifically, the fourth branch of the antenna may be connected to the ground layer to achieve grounding. In this case, The antenna can be supported on the circuit board through the fourth branch, so that the antenna can be fixed inside the terminal device and the grounding scheme of the fourth branch can be conveniently realized.

Description of drawings

FIG. 1 is a schematic partial structure diagram of a terminal device provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an antenna provided by an embodiment of the present application;

Figure 3a is an equivalent circuit diagram of a right-hand transmission line;

Figure 3b is an equivalent circuit diagram of a left-hand transmission line;

Figure 3c is an equivalent circuit diagram of a left-handed composite transmission line;

4 is a schematic diagram of the current distribution on the radiator of the antenna in the first working mode;

Fig. 5 is the partial enlarged view of A place in Fig. 4;

6 is a schematic diagram of the current distribution on the radiator of the antenna in the second working mode;

7 is a schematic diagram of the current distribution on the radiator of the antenna in the third working mode;

Fig. 8 is a partial enlarged view at B in Fig. 7;

9 is a schematic diagram of the current distribution on the radiator of the antenna in the fourth operating mode;

FIG. 10 is an S-parameter curve diagram of an antenna provided by an embodiment of the present application;

FIG. 11 is an antenna efficiency curve diagram of an antenna provided by an embodiment of the present application;

FIG. 12 is an S-parameter curve diagram after antenna debugging provided by an embodiment of the present application;

FIG. 13 is a graph of antenna efficiency after antenna debugging provided by an embodiment of the present application.

Reference number:

1-terminal equipment; 100-shell; 200-circuit board; 300-antenna; 10-dielectric substrate; 20-radiator;

30-feed point transmission line; 21-first branch; 22-second branch; 23-third branch; 24-fourth branch;

211-first connection part; 212-second connection part; 213-third connection part; 214-fourth connection part; 2141-first protruding part;

221 - the second protrusion; 231 - the first branch; 232 - the second branch; 233 - the third branch; 234 - the fourth branch.

Detailed ways

In order to facilitate understanding of the antenna provided by the embodiments of the present application, an application scenario of the antenna is first described below. The antenna provided in this embodiment of the present application can be applied to a terminal device, and is used to enable the terminal device to implement a signal sending and receiving function. The terminal device may be a CPE, a router, a long term evolution (long term evolution, LTE) device, or a world interoperability for microwave access (world interoperability for microwave access, WiMAX) device, or the like. Taking the CPE as an example, the CPE is a communication device located at the premises of a terminal user, which may be a mobile station (mobile station, MS) or a subscriber station (subscriber station, SS). CPE can convert cellular signals such as LTE, wideband code division multiple access (W-CDMA), global system for mobile communications (GSM), and 5G mobile networks (5G new radio, 5G NR). , converted into Ethernet or a common WiFi signal for mobile terminals such as smart phones, tablet computers, notebook computers, etc., and can support multiple mobile terminals surfing the Internet at the same time.

At this stage, with the development of 5G technology, the NR frequency band has been further expanded, and CPE products have added 0.6GHz frequency band coverage requirements. However, the existing product Sub-3G antenna solution only supports 0.7GHz ~ 0.9GHz, which cannot meet the product frequency band coverage requirements. . Based on this, the present application provides an antenna and a terminal device using the antenna. The antenna can generate four working modes, and can achieve continuous coverage in the 0.6GHz-0.96GHz frequency band and the 1.427GHz-1.517GHz frequency band, thereby It can widen the working frequency band of the terminal equipment and improve the working performance of the terminal equipment. Referring to FIG. 1 , FIG. 1 is a schematic partial structure diagram of a terminal device 1 provided by an embodiment of the present application. The terminal device 1 includes a casing 100 , a circuit board 200 and an antenna 300 disposed in the casing 100 . The circuit board 200 is provided with a radio frequency chip (not shown in the figure) and a radio frequency transceiver circuit, and the radio frequency chip can be disposed on the circuit board 200 by means of wafer level packaging or flip-chip packaging. RF port connection. The antenna 300 includes a dielectric substrate 10 and a radiator 20, the dielectric substrate 10 can be used to support and fix the radiator 20, the radiator 20 is arranged on the dielectric substrate 10, and the radiator 20 can be electrically connected to the radio frequency transceiver circuit through the feeding transmission line 30, The current energy fed into the antenna 300 by the radio frequency transceiver circuit through the feed transmission line 30 is converted into electromagnetic energy and radiated out, and the electromagnetic energy received by the antenna 300 is converted into current energy and transmitted to the radio frequency transceiver circuit through the feed transmission line 30, so that the terminal equipment 1 to realize the function of signal transmission and reception. It should be understood that the electrical connections described in the embodiments of the present application include direct connections and coupled connections. It should be noted that FIG. 1 and the following related drawings only schematically show some components included in the terminal device 1, and the actual shape, actual size, actual position and actual structure of these components are not affected by FIG. 1 and the following drawings. limited.

In this embodiment, the circuit board 200 may be a rigid circuit board, a flexible circuit board, or a flexible-rigid circuit board. The circuit board 200 may use an FR-4 dielectric board, a Rogers (Rogers) dielectric board, or a mixed FR-4 and Rogers dielectric board, and so on. Here, FR-4 is the code name for a flame-resistant material grade, and the Rogers dielectric board is a high-frequency board. In some embodiments, the circuit board 200 may be a multi-layer board, and the radio frequency chip may be specifically disposed on the top board or the bottom board of the circuit board 200 . In addition, in the multilayer structure of the circuit board 200, one or more ground layers may also be included. The cross-sectional shape of the circuit board 200 perpendicular to its thickness direction is not limited to the rectangle shown in FIG. A regular shape, which is not limited in this application. When the cross-sectional shape of the circuit board 200 is rectangular, the cross-sectional size of the circuit board 200 may be approximately 90mm*145mm. It should be noted that the orientation terms such as "top" and "bottom" used by the terminal device in the embodiments of the present application are mainly described based on the display orientation of the terminal device in FIG. The limitation of the orientation in .

Similarly, the dielectric substrate 10 may be a rigid substrate, a flexible substrate, or a rigid-flex substrate. It can be understood that when the dielectric substrate 10 is a flexible substrate or a rigid-flex substrate, a reinforcing plate may be provided on the side of the dielectric substrate 10 away from the radiator 20 to achieve reliable support for the radiator 20 . The dielectric substrate 10 can be an FR-4 dielectric board, a Rogers dielectric board, or a mixed FR-4 and Rogers dielectric board, and so on. In addition, the cross-sectional shape of the dielectric substrate 10 is not limited to the rectangle shown in FIG. 1 . In other embodiments, the cross-sectional shape of the dielectric substrate 10 may also be circular, oval, or other regular or irregular shapes. , this application does not limit it.

In some embodiments, the feeder transmission line 30 may be a coaxial line, and the feeder transmission line 30 includes an inner conductor and an outer conductor wrapped outside the inner conductor, wherein the inner conductor of the feeder transmission line can be used for feeding, and the outer conductor is For grounding, the inner conductor and the outer conductor are separated by an insulating medium layer. In specific setting, one end of the inner conductor of the feeder transmission line 30 is electrically connected to the radio frequency transceiver circuit, and the other end is electrically connected to the radiator 20; one end of the outer conductor of the feeder transmission line 30 is electrically connected to the grounding member of the terminal device 1, The other end is electrically connected to the radiator 20 . In some embodiments, the grounding member may be the ground layer of the circuit board 200 , and at this time, the outer conductor of the feed transmission line 30 is connected to the ground layer of the circuit board 200 to achieve grounding. In other embodiments, the grounding member may also be other metal components such as a heat sink of the terminal device 1, and the outer conductor of the feeding transmission line 30 may also be grounded by connecting with these metal components.

Referring to FIG. 2 , FIG. 2 is a schematic structural diagram of an antenna provided by an embodiment of the present application. In the embodiment of the present application, the radiator 20 may be formed on the dielectric substrate 10 by a printing process, a photolithography process, or the like, or may be formed by a process such as stamping or cutting, and then fixed to the dielectric substrate by bonding or other fixing methods. 10 on. The present application does not limit the specific forming manner of the radiator. The radiator 20 may include four branches, which are a first branch 21, a second branch 22, a third branch 23 and a fourth branch 24. The structure and arrangement of each branch will be described in detail below with reference to FIG. 2 . .

The first branch 21 may include a first connection part 211 , a second connection part 212 , a third connection part 213 and a fourth connection part 214 . When specifically arranged, the head end of the first connection part 211 is the ground end of the antenna 300 . The head end s1 of the first connection part 211 is connected to the outer conductor of the feeding transmission line 30, the end f1 of the first connection part 211 is connected to the head end s2 of the second connection part 212, and the end f2 of the second connection part 212 is connected to the third connection part 212. The head end s3 of the connection part 213 is connected, the end f3 of the third connection part 213 is connected with the head end s4 of the fourth connection part 214 , and the end f4 of the fourth connection part 214 is connected with the head end s1 of the first connection part 211 . interval. It should be noted that the “head end” and “end” of each connecting portion of the first branch 21 can be determined according to the direction in which they are sequentially connected (for example, the clockwise direction in FIG. 2 ). The upstream end can be defined as the "head end", and the downstream end can be defined as the "end". It can be understood that the head end s1 of the first connection part 211 is also the head end of the first branch 21 , and the end f4 of the fourth connection part 214 is also the end of the first branch 21 .

In some embodiments, each connection portion may be disposed on the same surface of the dielectric substrate 10 . For example, in the embodiment shown in FIG. 2 , each connecting portion is disposed on the first surface 11 of the dielectric substrate 10 , and the head ends and the ends of two adjacent connecting portions can be directly connected. In this case, the first The branch 21 can be an integral structure, which is beneficial to simplify the manufacturing process of the antenna 300 .

In other embodiments, each connection portion may also be disposed on two opposite sides of the dielectric substrate 10 . For example, the first connection portion 211 and the second connection portion 212 may be provided on the first surface 11 of the dielectric substrate 10, and the third connection portion 213 and the fourth connection portion 214 may be provided on the second surface of the dielectric substrate 10 (not shown in the figure). shown), at this time, the end of the second connection part 212 and the head end of the third connection part 213 can be electrically connected through a via hole. Alternatively, the first connecting portion 211 and the third connecting portion 213 may be disposed on the first surface 11 of the dielectric substrate 10, and the second connecting portion 212 and the fourth connecting portion 214 may be disposed on the second surface of the dielectric substrate 10. In this case, The end of the first connection part 211 and the head end of the second connection part 212 , the end of the second connection part 212 and the head end of the third connection part 213 , the end of the third connection part 213 and the head end of the fourth connection part 214 Electrical connections can be achieved through vias. It should be noted that the specific setting positions of each connection part are not limited to the two listed above, and can be designed according to actual needs during the specific implementation, as long as the connection parts can be connected in sequence, and there is no need for too much here. Repeat.

It can be understood that when each connection part is arranged on the same surface of the dielectric substrate 10, the first connection part 211, the second connection part 212, the third connection part 213 and the fourth connection part 214 are connected in sequence, which can form a split ring-like At this time, the opening of the split ring is the distance between the end of the fourth connection portion 214 and the head end of the first connection portion 211 . When each connecting portion is provided on the first surface 11 and the second surface of the dielectric substrate 10 , the first connecting portion 211 , the second connecting portion 212 , the third connecting portion 213 and the fourth connecting portion 214 are on the first surface of the dielectric substrate 10 . The projections of 11 are connected in sequence, and a structure similar to a split ring can also be formed. At this time, the opening of the split ring is the distance between the projection of the end of the fourth connecting portion 124 and the head end of the first connecting portion 211 on the first surface 11 .

In some embodiments, the first connecting portion 211 and the third connecting portion 213 may be respectively disposed along the first direction (ie, the x-axis direction), and the second connecting portion 212 and the fourth connecting portion 214 may be respectively disposed along the second direction (ie, the x-axis direction). y-axis direction) setting. When the cross section of the dielectric substrate 10 is rectangular, the first direction may be the width direction of the dielectric substrate 10 , and the second direction may be the length direction of the dielectric substrate 10 . At this time, the first connection portion 211 is opposite to the third connection portion 213 The second connecting portion 212 is disposed opposite to the fourth connecting portion 214, and the first branch is generally in the shape of a rectangular split ring structure. The length of the second connection portion 212 may be between 75mm˜76mm, for example, the length of the second connection portion 212 may be 75mm, 75.5mm, 76mm, and so on. The length of the third connecting portion 213 may be between 16.5 mm and 17.5 mm, for example, the length of the third connecting portion 213 may be 16.5 mm, 17 mm, 17.5 mm and so on. The length of the first connecting part 211 may be slightly smaller than the length of the third connecting part 213 . At this time, the projection of the head end of the first connecting part 213 on the first projection plane is located between the head end and the end of the third connecting part 213 , The first projection surface can be understood as the plane where the surface of the third connecting portion 213 facing the first connecting portion 211 is located. The length of the fourth connection part 214 is smaller than the length of the second connection part 212 , and the projection of the end of the fourth connection part 214 on the second projection surface is located between the head end and the end of the second connection part 212 , wherein the second projection surface It can be understood as the plane where the side of the second connecting portion 212 facing the fourth connecting portion 214 is located. Exemplarily, the projection of the end of the fourth connection part 214 on the second projection surface may be disposed close to the central area of the second connection part 212 .

In other embodiments, the first branch 21 may also be an open ring of other shapes, such as a circle, an oval, or other regular or irregular shapes, which may be determined by the shape of the substrate and the internal space of the terminal device. settings, which will not be repeated here.

The second branch 22 may be disposed at the opening of the split ring formed by the first branch 21 , and the second branch 22 is disposed along the y-axis direction. The second branch 22 may be disposed on the first surface 11 of the dielectric substrate 10 or may be disposed on the second surface of the dielectric substrate 10 , which is not limited in the present application. Taking the second branch 22 and the first branch 21 both disposed on the first surface 11 of the dielectric substrate 10 as an example, the second branch 22 is located between the first connecting part 211 and the third connecting part 213 , and the head of the second branch 22 is The end is disposed close to the head end of the first connection part 211 and is spaced apart from the head end of the first connection part 211 . The head end of the second branch 22 is connected to the inner conductor of the feeding transmission line 30 . The end is formed as the feeding end of the antenna 300 ; the end of the second branch 22 is located between the fourth connecting part 214 and the second connecting part 212 , that is, the second branch 22 is located in the split ring formed by the first branch 21 This arrangement can make the structure of the antenna 300 more compact; the end section of the second branch 22 is arranged in parallel with the end section of the fourth connecting portion 214, and the end section of the second branch 22 is parallel to the fourth connecting portion. There is a first gap d ₁ between the segments. It can be understood that the width direction of the first gap d ₁ is the x-axis direction.

In other embodiments, the end of the second branch 22 may also be located on the side of the fourth connecting portion 214 away from the second connecting portion 212 , that is, the second branch 22 is located outside the split ring formed by the first branch 21 . At this time, the end section of the second branch section 22 and the end section of the fourth connecting portion 214 may also be arranged in parallel and form a certain gap, and the width direction of the gap is also the x-axis direction.

In other embodiments, the second branch 22 and the fourth connecting portion 214 may also be located on the same straight line, and the end of the second branch 22 and the end of the fourth connecting portion 214 are spaced apart. The width direction of the gap between the ends of the fourth connection portion 214 is the y-axis direction.

It can be understood that when the second branch 22 and the first branch 21 are located on different surfaces of the dielectric substrate 10, the projections of the second branch 22 and the first branch 21 on the first surface 11 of the dielectric substrate 10 can satisfy the above-mentioned requirements. Positional relationship.

The third branch 23 may be disposed on the first surface 11 of the dielectric substrate 10 or may be disposed on the second surface of the dielectric substrate 10 , which is not limited in the present application. Taking the first branch 21 , the second branch 22 and the third branch 23 all disposed on the first surface 11 of the dielectric substrate 10 as an example, the third branch 23 may be located between the second branch 22 and the second connecting portion 212 , and the third branch 23 is also arranged approximately along the y-axis direction, which can make the structure of the antenna 300 more compact, which is beneficial to reduce the space occupied by the antenna 300 in the terminal device. The head end of the third branch 23 is connected to the head end of the second branch 22 , that is, the head end of the third branch 23 is also electrically connected to the inner conductor of the feeding transmission line 30 . In some embodiments, the end of the third branch 23 is electrically connected to the second connection portion 212 . Optionally, there is a second gap d ₂ between the end of the third branch 23 and the second connecting portion 212 .

Similarly, when the third branch 23 and the first branch 21 or the second branch 22 are disposed on different surfaces of the dielectric substrate 10 , the third branch 23 and the first branch 21 or the second branch 22 can be placed on the medium The projection of the first surface 11 of the substrate 10 satisfies the above positional relationship, and the head end of the third branch 23 and the head end of the second branch 22 can be electrically connected through via holes.

The fourth branch 24 may be connected to the outside of the second connecting portion 212 , and the extending direction of the fourth branch 24 may be at a certain angle with the first surface 11 of the dielectric substrate 10 , or may be parallel to the first surface 11 of the dielectric substrate 10 , This application does not limit this. For example, in the embodiment shown in FIG. 2 , the fourth branch 24 extends in a direction away from the first surface 11 of the dielectric substrate 10 , that is, the extending direction of the fourth branch 24 is perpendicular to the first surface 11 of the dielectric substrate 10 . The length of the fourth branch may be between 39.5 mm and 40.5 mm, for example, the length of the fourth branch may be 39.5 mm, 40.2 mm, 40.5 mm, and so on. The head end of the fourth branch 24 is connected to the second connection part 212, and the end of the fourth branch 24 is connected to the ground member of the terminal device. Exemplarily, the end of the fourth branch 24 may be connected to the ground layer of the circuit board 200 to achieve grounding, and at this time, the antenna 300 may be supported on one side of the circuit board 200 through the fourth branch 24 . Alternatively, the end of the fourth branch 24 may also be connected to a metal component such as a heat sink of the terminal device to realize grounding.

In some other embodiments, the fourth branch 24 may also be connected to the inner side of the second connecting portion 212 . In this case, the extending direction of the fourth branch 24 may also be arranged at a certain angle with the first surface 11 of the dielectric substrate 10 , Alternatively, it may be arranged in parallel with the first surface 11 of the dielectric substrate 10 , which is not limited in this application.

In addition, in this embodiment, the number of the fourth branches 24 may also be multiple, and the plurality of fourth branches 24 may be arranged at intervals. In a specific implementation, the plurality of fourth branches 24 may all be connected to the inner side of the second connection portion 212 , or may all be connected to the outer side of the second connection portion 212 , or may be partially connected to the inner side of the second connection portion 212 . Parts are connected to the outside of the second connecting portion 212 .

The antenna 300 provided in the embodiment of the present application uses the feeder transmission line 30 to feed power, the outer conductor of the feeder transmission line 30 is connected to the first stub, and the inner conductor of the feeder transmission line 30 feeds the second stub 22 and the third stub 23 , and connect the fourth branch 24 which is grounded on the first branch 21, four working modes can be generated, and the four working modes are: 1) The end of the first branch 21 and the end of the second branch 22 are mutually coupling, the left-handed composite antenna mode is formed, in this mode, the antenna 300 can generate the first resonant frequency; 2) the fourth branch 24 is connected to the first branch 21 through the connection position of the first branch 21 and the fourth branch 24 1/4λ mode at the end, in this mode, the antenna 300 can generate the second resonant frequency; 3) The third branch 23 couples and feeds the first branch 21 to excite the 3/4λ mode of the first branch 21 , in this mode, the antenna 300 can generate the third resonant frequency; 4) the coupling loop of the first branch 21 and the second branch 22 generates a 1λ mode like a loop antenna, in this mode, the antenna 300 can A fourth resonant frequency is generated. Through the first three working modes, the antenna can meet the high-efficiency broadband coverage in the 0.6GHz-0.96GHz frequency band, and through the fourth working mode, the antenna can meet the high-efficiency coverage in the 1.4GHz-1.6GHz frequency band.

It should be noted that the left-handed composite transmission line can be understood as applying a series capacitor and a parallel inductance on the right-handed transmission line to realize the left-handed working mode. Referring to Figures 3a, 3b and 3c together, Figure 3a is an equivalent circuit diagram of a right-handed transmission line, Figure 3b is an equivalent circuit diagram of a left-handed transmission line, and Figure 3c is an equivalent circuit diagram of a left-handed composite transmission line. The right-hand transmission line model can be represented as a combination of series inductance _LR and shunt capacitance _CR . The realization of the left-handed material is realized by loading the series capacitance _CL and the shunt _inductance LL in the conventional right-handed transmission line. Due to the inevitable existence of parasitic series inductance and parallel capacitance in the conventional transmission line, this material is not a pure left-handed material. , but a left-handed composite material, that is, a left-handed composite transmission line. The left-handed composite transmission line model can be expressed as a combination of an inductor L _R in series with a capacitor _CL , and a capacitor _CR in parallel with an inductor L _L to realize the work of the left hand. model.

Hereinafter, the four operating modes of the antenna 300 will be described in detail by taking as an example that the first branch 21 , the second branch 22 and the third branch 23 are all disposed on the first surface 11 of the dielectric substrate 10 .

Referring to FIG. 4 and FIG. 5 together, FIG. 4 is a schematic diagram of the current distribution on the radiator in the first working mode of the antenna, and FIG. 5 is a partial enlarged view of A in FIG. 4 . In the first working mode, the feed transmission line 30 feeds the RF current signal to the antenna 300 through the head end of the second stub 22, and the end section of the second stub 22 is connected to the end section of the first stub 21 (ie, the fourth connection A distributed capacitive coupling structure is formed between the end sections of the parts 214 through the first gap d ₁ , the current signal on the second branch 22 can be coupled to the first branch 21 through the first gap d ₁ , and the current in the second branch 22 Flow on the approximately annular branch formed with the first branch 21 (shown by the solid arrow in FIG. 4 ), forming a left-handed composite antenna pattern. It is equivalent to a series capacitor, and the entire first branch 21 can be equivalent to a parallel inductance, so as to realize the left-handed composite antenna mode and realize the miniaturization of the antenna. It can be seen that the current from the first branch 21 to the second branch 22 is always in the same direction, and the current amplitude does not change significantly except for the end of the branch. In addition, in this mode, the current on the fourth branch 24 is relatively weak, and the fourth branch 24 can function as a distributed inductance, which does not affect the generation of this mode.

Continuing to refer to FIG. 4 and FIG. 5, in this embodiment, the resonant frequency of the antenna in the left-handed composite antenna mode can be set by f=c/λ, and

Two formulas are determined, where f is the resonant frequency, c is the signal wave speed, λ is the wavelength, L is the equivalent inductance of the left and right hand composite antenna, and C is the equivalent capacitance of the left and right hand composite antenna. It can be understood that the wavelength λ is related to the length of the approximately annular branch formed by the second branch 22 and the first branch 21, and the equivalent capacitance C is related to the coupling amount of the first branch 21 and the second branch 22, so that it can be It can be seen that the resonant frequency f in the left-handed composite antenna mode is mainly determined by the length of the approximately annular stub formed by the first stub 21 and the second stub 22, and the coupling amount of the first stub 21 and the second stub 22. Therefore, by The resonant frequency can be adjusted by changing the length of the annular branch and the coupling amount between the first branch 21 and the second branch 22 .

Wherein, the length of the annular branch is roughly the sum of the length of the first branch 21 and the length of the second branch 22, therefore, according to f=c/λ, the length of the first branch 21 is increased, or the length of the second branch 22 is increased. Length, or increase the length of the first stub 21 and the second stub 22 together, the resonant frequency f in the left-handed composite antenna mode can be shifted to the low frequency; on the contrary, reduce the length of the first stub 21, or reduce the first stub 21. The lengths of the two stubs 22, or the lengths of the first stubs 21 and the second stubs 22 are reduced together, so that the resonance frequency f in the left-handed composite antenna mode can be shifted to a high frequency. It should be noted that when the length of the first branch 21 is increased or decreased, one or more of the first connecting portion 211 , the second connecting portion 212 , the third connecting portion 213 and the fourth connecting portion 214 can be adjusted by adjusting length to achieve.

The coupling amount between the first branch 21 and the second branch 22 can be represented by the coupling length and the coupling gap. It can be understood that the larger the coupling length is, the larger the equivalent capacitance C is, and the smaller the coupling length is, the smaller the equivalent capacitance C is; The larger the coupling gap is, the smaller the equivalent capacitance C is, and the smaller the coupling gap is, the larger the equivalent capacitance C is. according to

Increasing the relative length l ₁ between the end section of the fourth connection portion 214 and the end section of the second branch 22 , that is, the coupling length, can shift the resonant frequency f of the left-handed composite antenna mode to a low frequency; on the contrary, reducing the fourth connection portion 214 The relative length l ₁ of the end section of the second branch section 22 and the end section of the second branch section 22 can make the resonant frequency f of the left-hand composite antenna mode shift to a high frequency. And, increasing the first gap d ₁ between the end section of the fourth connection portion 214 and the end section of the second stub 22 , that is, the coupling gap, can make the resonant frequency f of the left-hand composite antenna mode shift to the high frequency; The first gap d ₁ between the end section of the small fourth connecting portion 214 and the end section of the second branch 22 can make the resonant frequency f of the left-hand composite antenna mode shift to a low frequency.

In some embodiments, the fourth connecting portion 214 is shifted toward a direction close to the second branch 22 , or the second branch 22 is offset toward a direction close to the fourth connecting portion 214 , or the fourth connecting portion 214 is connected to the second branch 214 . By offsetting the two branches 22 together, the first gap d ₁ between the end of the fourth connecting part 214 and the end of the second branch 22 can be reduced; the fourth connecting part 214 is offset in a direction away from the second branch 22 , or offset the second branch 22 in a direction away from the fourth connecting part 214 , or offset the fourth connecting part 214 and the second branch 22 together, the end of the fourth connecting part 214 and the second branch 22 can be added. The first gap d ₁ between the ends of .

In other embodiments, a first protruding portion 2141 may also be provided at the end of the fourth connecting portion 214 , and the first protruding portion 2141 is located on the side of the fourth connecting portion 214 facing the second branch 22 , and can be used for Adjusting the impedance matching of the antenna 300 is beneficial to enable the antenna 300 to obtain a higher gain. In addition, with this structure, in the design stage, by increasing or decreasing the width of the first protruding portion 2141 along the x-axis direction, the space between the end section of the fourth connecting portion 214 and the end section of the second branch 22 can be adjusted. The first gap d ₁ of the antenna can reduce the design difficulty of the antenna.

In some embodiments, a second protruding portion 221 may be provided at the end of the second branch 22 , and the second protruding portion 221 is located on the side of the second branch 22 facing away from the fourth connecting portion 214 . Similarly, the second protruding portion 221 can also be used to adjust the impedance matching of the antenna 300, so that the antenna 300 can obtain a higher gain, and in specific settings, the length of the second protruding portion 221 along the y-axis direction can be greater than The relative length l ₁ of the first branch 21 and the second branch 22 .

After testing, the first resonant frequency of the antenna 300 in the first operating mode (the left-handed composite antenna mode) can be roughly adjusted to be 0.7GHz˜0.8GHz.

Referring to FIG. 6 , FIG. 6 is a schematic diagram of the current distribution on the radiator of the antenna in the second working mode. In the second working mode, the current flows between the fourth branch 24 and the connection position m between the first branch 21 and the fourth branch 24 to the end of the first branch 21, forming the connection from the fourth branch 24 through the connection position m 1/4λ mode to the end of the first branch 21 . It can be understood that the length of the fourth branch 24 and the electrical length from the connection position m to the end of the first branch 21 are one quarter of the signal wavelength of the mode. The thickness of the solid arrow in FIG. 6 is used to represent the magnitude of the current. It can be seen from FIG. 6 that the current on the fourth branch 24 is relatively large, and the current to the end of the first branch 21 is the weakest, which is consistent with the 1/4λ mode. current distribution.

It should be noted that the electrical length can be understood as the ratio of the physical length of the transmission line to the transmitted signal wavelength. Specifically, in the embodiment of the present application, the physical length of the transmission line is the length of the fourth branch 24 and the connection position m to the first The sum of the lengths of the ends of the branches 21 .

In this embodiment, the resonant frequency of the antenna 300 in the above-mentioned 1/4λ mode can be determined by f=c/λ. Among them, the wavelength λ is related to the length of the fourth branch 24 and the length of the connection position m to the end of the first branch 21 , therefore, increase the length of the fourth branch 24 or increase the connection position m to the end of the first branch 21 , or increase the lengths of these two parts together, the resonant frequency f in the 1/4λ mode can be shifted to a low frequency; on the contrary, reducing the length of the fourth branch 24, or reducing the connection position m to the first branch The length of the end of 21, or reducing the lengths of these two parts together, can make the resonant frequency f in the 1/4λ mode shift to high frequencies.

In some other embodiments, the fourth branch 24 is moved in a direction close to the first branch 21, that is, the connecting position m is moved in a direction close to the first branch 21, and the connecting position m can also be increased to the first branch 21. 21, so that the resonant frequency f in the 1/4λ mode can be shifted to a low frequency; on the contrary, the fourth branch 24 is moved to the direction close to the third branch 23, that is, the connection position m is moved closer to the third branch The direction of the branch node 23 is moved, and the length from the connection position m to the end of the first branch node 21 can be reduced, so that the resonance frequency f in the 1/4λ mode can be shifted to a high frequency.

After testing, the second resonant frequency of the antenna 300 in the second working mode (the 1/4λ mode of the fourth branch through the connection position m between the first branch and the fourth branch to the end of the first branch) can be roughly adjusted as 0.7GHz～0.8GHz.

Referring to FIG. 7 and FIG. 8 together, FIG. 7 is a schematic diagram of the current distribution on the radiator in the third working mode of the antenna, and FIG. 8 is a partial enlarged view of B in FIG. 7 . In the third working mode, the feed transmission line 30 feeds the radio frequency current signal to the antenna 300 through the head end of the third branch 23, and the end of the third branch 23 couples and feeds the first branch 21 near the position n, The 3/4λ mode of the first branch 21 is excited. It can be understood that the electrical length of the first branch 21 is approximately three quarters of the signal wavelength λ of the mode. In the specific design, the electrical length between the position n and the head end of the first branch 21 is approximately one-third of the overall electrical length of the first branch 21, and the head end of the first branch 21 is the point where the current is larger, 1/4λ reaches the small current point (that is, the position n), and then reaches a large current point (the position o on the third connection part) after 1/4λ, and finally reaches the small current point (that is, the first branch after 1/4λ). end of the junction), which conforms to the current distribution of the 3/4λ mode.

In the embodiment of the present application, the third branch 23 may include a first branch 231 , a second branch 232 , a third branch 233 and a fourth branch 234 . When specifically arranged, the first branch 231 may be arranged along the first direction, and the first branch 231 The branch 231 is located on the side of the second branch 22 facing the second connection portion 212 of the first branch 21 , and the head end of the first branch 231 is connected to the head end of the second branch 22 and the inner conductor of the feeding transmission line 30 . The end of the branch 231 is connected to the head end of the second branch 232 ; the second branch 232 can be arranged along the second direction, and the second branch 232 is spaced apart from the second branch 22 and the second connecting portion 212 of the first branch 21 respectively , in the specific setting, the distance between the second branch 232 and the second connecting part 212 may not be less than 0.025λ; the third branch 233 is arranged along the first direction, and the third branch 233 is located in the second branch 232 close to the first branch 21 On one side of the second connecting portion 212, the head end of the third branch 233 is connected with the end of the second branch 232, and the end of the third branch 233 is connected with the head end of the fourth branch 234; the fourth branch 234 is arranged along the second direction , there is a second gap d ₂ between the fourth branch 234 and the second connection part 212 of the first branch 21 , and a distributed capacitive coupling structure is formed between the fourth branch 234 and the second connection part through the second gap d ₂ , The current signal on the third branch 23 can be coupled to the first branch 21 through the second gap d ₂ , thereby exciting the 3/4λ mode of the first branch 21 .

In some embodiments, in order to achieve a better coupling effect, the midpoint n' of the fourth branch 234 is set opposite to the position n, that is, the projection and position of the midpoint n' of the fourth branch on the second projection surface n coincides, or it can be understood that the position n is the projection point of the midpoint n' of the fourth branch on the second projection surface.

Continuing to refer to FIG. 7 and FIG. 8, in this embodiment, the resonant frequency of the antenna in the above-mentioned 3/4λ mode may be f=c/λ, and

Two formulas are determined. Among them, the wavelength λ is related to the length of the first branch 21 , L is the equivalent inductance of the antenna 300 when it works in the 3/4λ mode, and C is the equivalent capacitance when the antenna works in the 3/4λ mode. It can be understood that, The equivalent capacitance C is related to the coupling amount of the first branch 21 and the third branch 23 . It can be seen from this that the resonant frequency of the antenna 300 in the 3/4λ mode is mainly determined by the length of the first branch 21 and the coupling amount between the first branch 21 and the third branch 23 .

In the specific design, according to f=c/λ, increasing the length of the first branch 21 can make the resonant frequency f in the 3/4λ mode shift to a low frequency; on the contrary, reducing the length of the first branch 21 can make 3 The resonant frequency f in /4λ mode is shifted to high frequency.

The coupling amount between the first branch 21 and the third branch 23 can be represented by the coupling length and the coupling gap, wherein the coupling length is the length of the fourth branch 234 of the third branch 23 , and the coupling gap is the third branch 23 The second gap d ₂ between the fourth branch 234 of the first branch 234 and the second connecting portion 212 of the first branch 21 . according to

Increasing the length l ₂ of the fourth branch 234 can shift the resonant frequency f in the 3/4λ mode to a low frequency; on the contrary, decreasing the length of the fourth branch 234 can make the resonant frequency f in the 3/4λ mode move to a high frequency partial. And, by increasing the second gap d ₂ between the fourth branch 234 and the second connection part 212 , the resonant frequency f in the 3/4λ mode can be shifted to a high frequency; on the contrary, reducing the fourth branch 234 and the second connection The second gap d ₂ between the parts 212 can shift the resonant frequency f in the 3/4λ mode to a lower frequency.

In the specific design, increasing the length of the first branch 231 or the third branch 233 of the third branch 23 can make the fourth branch 234 shift toward the direction close to the second connecting portion 212 , and reduce the distance between the fourth branch 234 and the second branch 234 . the third gap d ₂ between the connecting parts 212 ; reducing the length of the first branch 231 or the third branch 233 of the third branch 23 can make the fourth branch 234 shift away from the second connecting part 212 , The second gap d ₂ between the fourth branch 234 and the second connection portion 212 is increased.

In some embodiments, the second gap d ₂ between the fourth branch 234 and the second connection portion 212 may be between 0.001λ˜0.025λ, for example, the second gap d ₂ may be 0.001λ, 0.005λ , 0.01λ, 0.015λ, 0.02λ, 0.025λ, and so on.

After testing, the third resonant frequency of the antenna 300 in the third working mode (the 3/4λ mode of the first branch) can be roughly adjusted to be 0.8GHz˜0.96GHz.

Referring to FIG. 9 , FIG. 9 is a schematic diagram of the current distribution on the radiator in the fourth working mode of the antenna. In the fourth working mode, the current flows on the approximately annular stub formed by the second stub 22 and the first stub 21 to form a 1λ mode like a Loop antenna. It can be understood that the sum of the length of the first branch 21 and the length of the second branch 22 is approximately equal to the signal wavelength λ of the mode. It can be seen that there is a large current point near the head end of the first branch 21, and after 1/4λ reaches the small current point (position p on the second connection part), the current reverses at this position, and then passes through 1/4λ It reaches a current high point (the position q on the third connection part 213), and then reaches a small current point (the position r on the fourth connection part 214) after 1/4λ, and the current reverses again at this position, based on the first In the coupling connection relationship between the end of a branch 21 and the end of the second branch 22 , the current flows to the second branch 22 and reaches the head end of the second branch 22 after approximately 1/4λ. That is, there are two large current points and two small current points on the annular branch, and the adjacent large current points and small current points are separated by 1/4λ, which conforms to the current distribution of the 1λ mode.

In this embodiment, the resonant frequency of the antenna 300 in the above-mentioned 1λ mode of the annular branch can be determined by f=c/λ. Among them, the wavelength λ is related to the length of the first branch 21 and the length of the second branch 22, therefore, the length of the first branch 21 is increased, or the length of the second branch 22 is increased, or the first branch 21 is also increased. Compared with the length of the second branch 22, the resonant frequency f in the 1λ mode can be shifted to a low frequency; on the contrary, the length of the first branch 21 can be reduced, or the length of the second branch 22 can be reduced, or the first branch 22 can be reduced together. The lengths of the branch 21 and the second branch 22 can make the resonant frequency f in the 1λ mode shift to a high frequency.

After testing, the fourth resonant frequency of the antenna 300 in the fourth working mode (the 1λ mode of the Loop antenna generated by the coupling loop of the first branch and the second branch) can be roughly adjusted to be 1.427GHz-1.517GHz.

Referring to FIG. 10 , FIG. 10 is an S-parameter curve diagram of an antenna provided by an embodiment of the present application. It should be noted that the S parameter is the scattering parameter, and S1,1 is the input reflection coefficient, that is, the input return loss, which indicates how much energy is reflected back to the source. The antenna provided by this embodiment of the present application can simultaneously generate a left-handed composite antenna pattern, a 1/4λ pattern in which the fourth branch passes through the connection position of the first branch and the fourth branch to the end of the first branch, and a 3 /4λ mode, as can be seen from Figure 10, through these three modes, the antenna can generate three resonances: resonance 1 (resonant frequency 0.61GHz), resonance 2 (resonant frequency 0.77GHz), and resonance 3 (resonant frequency 0.96GHz). , so as to achieve continuous coverage in the frequency band of 0.6GHz to 0.96GHz, thereby broadening the working frequency band of the terminal equipment and improving the working performance of the terminal equipment. In addition, the antenna also has a loop antenna-like 1λ mode generated by the coupling loop of the first branch and the second branch. In this mode, the antenna can generate resonance 4 (resonant frequency 1.48GHz), and achieve a range of 1.427GHz-1.517GHz. The coverage of the frequency band, so that the antenna can also send and receive signals in this frequency band, which is beneficial to broaden the application scenarios of the terminal equipment.

Referring to FIG. 11 together, FIG. 11 is an antenna efficiency curve diagram of an antenna provided by an embodiment of the present application. It can be seen that in the 0.6GHz-0.7GHz frequency band, the antenna efficiency is higher than -4dB; in the 0.7GHz-0.96GHz frequency band, the antenna efficiency is higher than -3dB; in the 1.427GHz-1.517GHz frequency band, the antenna efficiency is higher than -3dB.

Referring to FIG. 12 , FIG. 12 is an S-parameter curve diagram after antenna debugging provided by an embodiment of the present application. In the first three working modes, the antenna of the embodiment of the present application can satisfy S1,1<6dB in the frequency band of 0.6GHz-1.3GHz, and the relative bandwidth (ie, the signal bandwidth and The ratio of center frequency) reaches 73.6%. With reference to FIG. 13, FIG. 13 is a graph of the antenna efficiency after antenna debugging provided by an embodiment of the present application. It can be seen that in the 0.6GHz-0.7GHz frequency band, the antenna efficiency is higher than -4dB; in the 0.7GHz-1.3GHz frequency band , the antenna efficiency is higher than -3dB.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and should cover within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

An antenna, characterized in that it includes a dielectric substrate, a radiator, a feeding terminal and a ground terminal, the radiator is arranged on the dielectric substrate, and the radiator includes a first branch, a second branch, a third branch branch and the fourth branch, of which:

The first branch is in an open ring shape, and the head end of the first branch is electrically connected to the ground terminal;

The head end of the second branch is electrically connected to the feed end, and the end of the second branch is coupled and connected to the end of the first branch;

The head end of the third branch is electrically connected to the feed end, and the end of the third branch is coupled and connected to the first branch;

The head end of the fourth branch is connected to the first branch, and the end of the fourth branch is grounded.
The antenna according to claim 1, wherein the first branch comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part which are connected in sequence, and the first connecting part has a The end part and the end part of the fourth connection part are spaced apart from each other to form the opening of the split ring, the end part of the first connection part is the head end of the first branch, and the end part of the fourth connection part is the head end of the first branch. The part is the end of the first branch.
The antenna of claim 2, wherein the first connection portion and the third connection portion are arranged in parallel, and the first connection portion and the third connection portion extend in a first direction respectively; The second connecting portion and the fourth connecting portion are arranged in parallel, and the second connecting portion and the fourth connecting portion respectively extend along a second direction, and the second direction is different from the first direction.
The antenna according to claim 3, wherein the second branch extends along the second direction, and an end section of the second branch is opposite to an end section of the fourth connecting portion and has a first gap.
The antenna according to claim 4, characterized in that, a first protruding part is provided on a section of the end of the fourth connecting part, and the first protruding part is located on the fourth connecting part and faces the second branch. side.
The antenna according to claim 4 or 5, wherein a section of the end of the second branch is provided with a second protrusion, and the second protrusion is located on the second branch away from the fourth side of the connector.
The antenna according to any one of claims 3 to 6, wherein the third branch comprises a first branch, a second branch, a third branch and a fourth branch connected in sequence, and the first branch is along the The first direction is arranged, and the first branch is located on the side of the second branch close to the second connecting part; the second branch extends along the second direction; the third branch extends along the The first branch extends in the first direction, and the third branch is located on the side of the second branch close to the second connecting portion; the fourth branch extends along the second direction, and the fourth branch is connected to the second branch. There is a second gap between the second connection parts.
The antenna according to claim 7, wherein a midpoint of the fourth branch has a projection point on the side of the second connection portion facing the fourth connection portion, and the projection point is different from the first connection portion. The electrical length between the connection parts is 1/3 of the electrical length of the first branch.
The antenna according to any one of claims 1 to 8, wherein the first branch, the second branch, and the third branch are provided on the first surface of the dielectric substrate.
The antenna according to any one of claims 1 to 9, wherein the fourth branch is extended along the thickness direction of the dielectric substrate.
The antenna according to any one of claims 1 to 10, wherein the antenna generates a first resonance frequency through the first branch and the second branch;

the antenna generates a second resonance frequency through the fourth branch and the first branch;

the antenna generates a third resonance frequency through the third branch and the first branch;

The antenna generates a fourth resonance frequency through the first branch and the second branch.
The antenna according to claim 11, wherein the first resonance frequency is 0.6GHz-0.7GHz, the second resonance frequency is 0.7GHz-0.8GHz, and the third resonance frequency is 0.8GHz-0.96 GHz, the fourth resonance frequency is 1.427GHz-1.517GHz.
A terminal device, characterized in that it includes a circuit board, a feeder transmission line, and the antenna according to any one of claims 1 to 12, wherein the circuit board is provided with a radio frequency transceiver circuit, and one end of the feeder transmission line is connected to all The radio frequency transceiver circuit is connected, and the other end is connected to the feed end.
The terminal device of claim 13, wherein the circuit board comprises a ground plane, and an end of the fourth branch is connected to the ground plane.