CN219067239U

CN219067239U - Three-frequency band loop antenna and mobile terminal

Info

Publication number: CN219067239U
Application number: CN202223597506.4U
Authority: CN
Inventors: 马保军; 张治宇; 吴佳俊; 罗田
Original assignee: Emdoor Digital Technology Co ltd
Current assignee: Emdoor Digital Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-23
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a tri-band loop antenna and a mobile terminal, wherein the tri-band loop antenna comprises: a radio frequency main board and a metal plate; the antenna comprises a metal plate, wherein a feeding point and a feeding point are respectively arranged on the metal plate at two sides of one end of the metal plate, the feeding point and the feeding point are electrically connected with a radio-frequency main board through the metal plate, the metal plate at two sides of the other end of the metal plate is electrically connected through a parallel capacitor, the feeding point and the parallel capacitor divide the metal plate at the position of the gap into a first radiation section, a second radiation section and a third radiation section, the gap between the first radiation sections is the first radiation gap, the gap between the second radiation sections is the second radiation gap, and the gap between the third radiation sections is the third radiation gap.

Description

Three-frequency band loop antenna and mobile terminal

Technical Field

The utility model relates to the technical field of loop antennas, in particular to a tri-band loop antenna and a mobile terminal.

Background

Along with the development of the communication industry, the existing consumer electronic products basically carry functions such as GPS/WiFi/BT and the like, and the functions are realized based on the antenna, meanwhile, in the design process of the mobile terminal, in order to make the appearance more attractive, an internal antenna is generally adopted, namely, the antenna is placed in the shell of the mobile terminal, but the radiation energy of the existing internal antenna is mostly absorbed by the shell due to the influence of the shell, so that the radiation efficiency of the antenna is influenced.

Disclosure of Invention

The utility model mainly aims to provide a tri-band loop antenna and a mobile terminal, and aims to solve the problem that the radiation efficiency of an existing mobile terminal built-in antenna is low.

In order to achieve the above object, the present utility model provides a tri-band loop antenna, which includes: a radio frequency main board and a metal plate;

the metal plates at two sides of one end of the slot are respectively provided with a feeding point and a feeding point, the feeding points and the feeding points are electrically connected with the radio-frequency main board through the metal plates, the metal plates at two sides of the other end of the slot are electrically connected through parallel capacitors, the feeding points and the parallel capacitors divide the metal plates at the slot into a first radiation section, a second radiation section and a third radiation section, the slots between the first radiation sections are first radiation slots, the slots between the second radiation sections are second radiation slots, and the slots between the third radiation sections are third radiation slots.

Optionally, the first radiation segment includes: a first radiating arm and a first reference ground;

the first radiating arm is arranged in parallel with the first reference ground, the first radiating arm is electrically connected with the feed point, and the first reference ground is electrically connected with the feed point.

Optionally, the width of the first radiation gap is 1.8mm, the length of the first radiation arm is L1, wherein L1 is less than or equal to 10mm and less than 14.5mm, and the first radiation arm is used for radiating and/or receiving electromagnetic waves with the frequency f1, wherein f1 is less than or equal to 5100MHz and less than or equal to 5825MHz.

Optionally, the second radiation section includes: a second radiating arm and a second reference ground;

the second radiating arm is arranged in parallel with the second reference ground, one end of the second radiating arm is electrically connected with the feed point, the other end of the second radiating arm is connected with one end of the parallel capacitor, one end of the second reference ground is connected with the feed point, and the other end of the second reference ground is connected with the other end of the parallel capacitor.

Optionally, the width of the second radiation gap is 1.8mm, the length of the second radiation arm is L2, wherein L2 which is 40mm less than or equal to 62.5mm, and the second radiation arm is used for radiating and/or receiving electromagnetic waves with the frequency f2, wherein f2 which is 2400MHz less than or equal to 2500MHz.

Optionally, the third radiation segment includes: a third radiating arm, a third reference ground, and the shunt capacitance;

the third radiating arm is arranged in parallel with the third reference ground, the third radiating arm is connected with one end of the parallel capacitor, and the third reference ground is connected with the other end of the parallel capacitor.

Optionally, the width of the third radiation slit is 1.8mm, the length of the third radiation arm is L3, wherein 34mm is less than or equal to L3<47.5mm, and the third radiation arm is used for radiating and/or receiving electromagnetic waves with frequency f3, wherein f3=1575.42 MHz.

Optionally, the feeding point includes an antenna thimble.

Optionally, the capacitance value of the parallel capacitor is smaller than 5PF.

In addition, to achieve the above object, the present utility model also proposes a mobile terminal including: a tri-band loop antenna as hereinbefore described.

The tri-band loop antenna provided by the utility model comprises: a radio frequency main board and a metal plate; the metal plates at two sides of one end of the slot are respectively provided with a feeding point and a feeding point, the feeding points and the feeding points are electrically connected with the radio-frequency main board through the metal plates, the metal plates at two sides of the other end of the slot are electrically connected through parallel capacitors, the feeding points and the parallel capacitors divide the metal plates at the slot into a first radiation section, a second radiation section and a third radiation section, the slots between the first radiation sections are first radiation slots, the slots between the second radiation sections are second radiation slots, and the slots between the third radiation sections are third radiation slots. Because the metal plate is used as a part of the antenna, the utility model radiates and receives signals through the first radiating section, the second radiating section and the third radiating section on the metal plate.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a first embodiment of a tri-band loop antenna provided by the present utility model;

fig. 2 is an equivalent circuit diagram of a tri-band loop antenna according to a first embodiment of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				1	Metal plate	b2	A second radiation arm
2	Gap(s)	b3	Second reference ground
				3	Feed point	c1	Third radiation slit
4	Feed point	c2	Third radiating arm
				C	Parallel capacitor	c3	Third reference ground
a	A first radiation section	L1	First inductor
				b	A second radiation section	L2	Second inductor
c	A third radiation section	L3	Third inductor
				a1	First radiation slit	C1	First capacitor
a2	A first radiating arm	C2	Second capacitor
				a3	First reference ground	C3	Third capacitor
b1	Second radiation slit

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the case where a directional instruction is involved in the embodiment of the present utility model, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a tri-band loop antenna according to the present utility model.

As shown in fig. 1, the tri-band loop antenna includes: a radio frequency main board (not shown in the figure) and a metal plate 1;

the metal plate 1 is provided with a gap 2, the metal plates 1 on two sides of one end of the gap 2 are respectively provided with a feeding point 3 and a feeding point 4, the feeding point 3 and the feeding point 4 are electrically connected with the radio-frequency main board through the metal plates 1, the metal plates 1 on two sides of the other end of the gap 2 are electrically connected through a parallel capacitor C, the feeding point 3, the feeding point 4 and the parallel capacitor C divide the metal plates 1 at the gap 2 into a first radiation section a, a second radiation section b and a third radiation section C, the gap 2 between the first radiation sections a is a first radiation gap a1, the gap 2 between the second radiation sections b is a second radiation gap b1, and the gap 2 between the third radiation sections C is a third radiation gap C1.

It should be noted that the three-band loop antenna of the present embodiment may be applied to any scenario where an antenna is used to radiate and receive radio frequency signals, and the material of the metal plate 1 may include an almag or may further include other metal materials, which is not limited in this embodiment.

It is understood that the slot 2 may be any position of the metal plate 1, and in this embodiment, the slot 2 is disposed at an edge position of the metal plate 1 for convenience of appearance, and the rf main board is electrically connected to the feeding point 3 and the feeding point 4 through the metal plate 1, so that the first radiating section a, the second radiating section b, and the third radiating section c of the metal plate 1 can transmit and receive rf signals.

It should be understood that the feeding point 3 can be directly fed by an antenna thimble, so that the use of a feeder is avoided, the installation space occupied by the antenna is reduced, the feeding point 3 is used for transmitting an electric signal, and the feeding point 4 is connected with the grounding end of the radio-frequency main board.

Further, in order to achieve radiation and reception of the 5G signal, the first radiation segment a includes: a first radiating arm a2 and a first reference ground a3;

the first radiating arm a2 is arranged in parallel with the first reference ground a3, the first radiating arm a2 is electrically connected with the feeding point 3, and the first reference ground a3 is electrically connected with the feeding point 4.

The side of the first radiating section a near the feeding point 3 may be the first radiating arm a2, one end of the first radiating arm a2 may be electrically connected to the feeding point 3, the side of the first radiating section a near the feeding point 4 may be the first reference ground a3, and the first reference ground a3 may be electrically connected to the feeding point 4.

It is understood that the width of the first radiation slit a1 is 1.8mm, the length of the first radiation arm a2 is L1, wherein L1 is 10mm <14.5mm, and the first radiation arm a2 is used for radiating and/or receiving electromagnetic waves with frequency f1, wherein f1 is 5100MHz < 5825MHz.

It should be understood that when the width of the first radiation slit a1 is 1.8mm, the length of the first radiation arm a2 is less than 10mm, the electromagnetic wave with the frequency range of 5100MHz to 5825MHz cannot be called out, and when the length of the first radiation arm a2 is greater than 14.5mm, the electromagnetic wave with the frequency range of 5100MHz to 5825MHz cannot be called out, but when the length of the first radiation arm a2 is equal to 14.5mm, the electromagnetic wave with the frequency range of 5100MHz to 5825MHz can be called out under theoretical conditions (similar to the condition that light is under vacuum), but the actual environment of the specific application is not theoretical conditions, and therefore the length of the first radiation arm a2 is L1, wherein L1 is less than or equal to 10mm <14.5mm.

For ease of understanding, fig. 2 is an equivalent circuit diagram of the tri-band loop antenna in the first embodiment of the tri-band loop antenna provided by the present utility model.

As shown in fig. 2, the first radiating arm a2 may be equivalent to a first inductor L1, the first radiating gap a1 between the first radiating arm a2 and the first reference ground a3 may be equivalent to a first capacitor C1, the first inductor L1 and the first capacitor C1 are connected in parallel to form an LC parallel resonant circuit, a connection point of the first inductor L1 and the first capacitor C1 at the same end is connected to a power supply, and a connection point of the first inductor L1 and the first capacitor C1 at the other end is grounded.

In another embodiment, the width of the first radiation slit a1 may be 2.5mm, and when the width of the first radiation slit a1 is 2.5mm, the length of the first radiation arm a2 is L1', where 7.5mm is equal to or less than L1' <14.5mm.

Further, the second radiation section b includes: a second radiating arm b2 and a second reference ground b3;

the second radiating arm b2 is arranged in parallel with the second reference ground b3, one end of the second radiating arm b2 is electrically connected with the feeding point 3, the other end of the second radiating arm b2 is connected with one end of the parallel capacitor C, one end of the second reference ground b3 is connected with the feeding point 4, and the other end of the second reference ground b3 is connected with the other end of the parallel capacitor C.

The side of the second radiating section b near the feeding point 3 may be the second radiating arm b2, one end of the second radiating arm b2 is electrically connected to the feeding point 3, the other end of the second radiating arm b2 is connected to one end of the parallel capacitor C, the side of the second radiating section b near the feeding point 4 may be the second reference ground b3, one end of the second reference ground b3 is connected to the feeding point 4, and the other end of the second reference ground b3 is connected to the other end of the parallel capacitor C.

It is understood that the width of the second radiation slit b1 is 1.8mm, the length of the second radiation arm b2 is L2, wherein 40mm < L2<62.5mm, and the second radiation arm b2 is used for radiating and/or receiving electromagnetic waves with frequency f2, wherein 2400MHz < f 2< 2500MHz.

It should be understood that when the width of the second radiation slot b1 is 1.8mm, the length of the second radiation arm b2 is less than 40mm, the electromagnetic wave with the frequency band of 2400MHz less than or equal to f2 less than or equal to 2500MHz cannot be called out, and when the length of the second radiation arm b2 is greater than 62.5mm, the electromagnetic wave with the frequency band of 2400MHz less than or equal to f2 less than or equal to 2500MHz cannot be called out, but when the length of the second radiation arm b2 is equal to 62.5mm, the electromagnetic wave with the frequency band of 2400MHz less than or equal to f2 less than or equal to 2500MHz can be called out under theoretical conditions (similar to light under vacuum conditions), but the practical environment of specific application is not theoretical conditions, and therefore the length of the second radiation arm b2 is L2, wherein L2 is 40mm less than or equal to 62.5mm.

For easy understanding, as shown in fig. 2, the second radiating arm b2 may be equivalent to a second inductor L2, a second radiating slot b1 between the second radiating arm b2 and the second reference ground b3 may be equivalent to a second capacitor C2, the second inductor L2 and the second capacitor C2 are connected in series to form an LC series resonant circuit, one end of the second inductor L2 is connected to a power supply, the other end of the second inductor L2 is connected to the second capacitor C2, and the other end of the second capacitor C2 is grounded.

In another embodiment, the width of the second radiation slit b1 may be 2.5mm, and when the width of the second radiation slit b1 is 2.5mm, the length of the second radiation arm b2 is L2', where 29mm is equal to or less than L2' <62.5mm.

Further, the third radiation section c includes: a third radiating arm C2, a third reference ground C3 and said parallel capacitance C;

the third radiating arm C2 is arranged in parallel with the third reference ground C3, the third radiating arm C2 is connected with one end of the parallel capacitor C, and the third reference ground C3 is connected with the other end of the parallel capacitor C. Specifically, the third radiating arm C2 is connected to the end of the parallel capacitor C to which the second radiating arm b2 is connected, and the third reference ground C3 is connected to the end of the parallel capacitor C to which the second reference ground b3 is connected.

The side of the third radiating section C near the second radiating arm b2 may be the third radiating arm C2, one end of the third radiating arm C2 is connected to one end of the parallel capacitor C connected with the second radiating arm b2, the side of the third radiating section C near the second reference ground b3 may be the third reference ground C3, and one end of the third reference ground C3 is connected to one end of the parallel capacitor C connected with the second reference ground b 3.

It is understood that the width of the third radiation slit c1 is 1.8mm, the length of the third radiation arm c2 is L3, where 34mm is less than or equal to L3<47.5mm, and the third radiation arm c2 is configured to radiate and/or receive electromagnetic waves with a frequency f3, where f3=1575.42 MHz.

It should be understood that when the width of the third radiating slit c1 is 1.8mm, the length of the third radiating arm c2 is less than 34mm, the electromagnetic wave with the frequency band of 1575.42MHz cannot be called out, and when the length of the third radiating arm c2 is greater than 47.5mm, the electromagnetic wave with the frequency band of 1575.42MHz cannot be called out, but when the length of the third radiating arm c2 is equal to 47.5mm, the electromagnetic wave with the frequency band of 1575.42MHz can be called out under theoretical conditions (similar to the condition that light is under vacuum), but the actual environment of the specific application is not theoretical conditions, and therefore the length of the third radiating arm c2 is L3, wherein 34mm is less than or equal to L3<47.5mm.

For easy understanding, as shown in fig. 2, the third radiating arm C2 may be equivalent to a third inductor L3, a third radiating slot C1 between the third radiating arm C2 and the third reference ground C3 may be equivalent to a third capacitor C3, the third capacitor C3 is parallel to the parallel capacitor C, the third inductor L3, the third capacitor C3 and the parallel capacitor C are parallel to form an LC parallel resonant circuit, one end of the third inductor L3 is connected to one end of the third capacitor C3 and then connected to one end of the second inductor L2, and the other end of the third inductor L3 is connected to the other end of the third capacitor C3 and then grounded.

In another embodiment, the width of the third radiating slit C1 may be 2.5mm, and when the width of the third radiating slit C1 is 2.5mm, the length of the third radiating arm C2 is L3', where 24.2mm is equal to or less than L3' <47.5mm, and the capacitance value of the shunt capacitor C needs to be less than 5PF.

The tri-band loop antenna provided in this embodiment includes: a radio frequency main board and a metal plate 1; the antenna comprises a metal plate 1, wherein a slot 2 is arranged on the metal plate 1, a feeding point 3 and a feeding point 4 are respectively arranged on the metal plate 1 at two sides of one end of the slot 2, the feeding point 3 and the feeding point 4 are electrically connected with a radio-frequency main board through the metal plate 1, the metal plate 1 at two sides of the other end of the slot 2 is electrically connected through a parallel capacitor C, the feeding point 3, the feeding point 4 and the parallel capacitor C divide the metal plate 1 at the slot 2 into a first radiation section a, a second radiation section b and a third radiation section C, the slot 2 between the first radiation section a is the first radiation slot a1, the slot 2 between the second radiation section b is the second radiation slot b1, and the slot 2 between the third radiation section C is the third radiation slot C1, and then a loop antenna supporting three-frequency band emission is formed.

In addition, the utility model also provides a mobile terminal which comprises the tri-band loop antenna in the scheme.

It should be noted that the mobile terminal may be a notebook computer, a mobile phone, a tablet computer, or other electronic devices that need to use an antenna to radiate and receive radio frequency signals.

It can be understood that the structure of the tri-band loop antenna in the mobile terminal can refer to the above-mentioned tri-band loop antenna embodiment, and will not be described herein again; because the mobile terminal provided by the utility model uses the tri-band loop antenna, the embodiment of the mobile terminal provided by the utility model comprises all the technical schemes of all the embodiments of the tri-band loop antenna, and the achieved technical effects are identical, and are not repeated here.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A tri-band loop antenna, comprising: a radio frequency main board and a metal plate;

2. The tri-band loop antenna of claim 1 wherein said first radiating segment comprises: a first radiating arm and a first reference ground;

3. The tri-band loop antenna of claim 2 wherein said first radiating slot has a width of 1.8mm, said first radiating arm has a length L1, wherein 10mm +.l1 <14.5mm, said first radiating arm is for radiating and/or receiving electromagnetic waves having a frequency f1, wherein 5100MHz +.f1 +.5825 MHz.

4. The tri-band loop antenna of claim 1 wherein said second radiating segment comprises: a second radiating arm and a second reference ground;

5. The tri-band loop antenna of claim 4 wherein said second radiating slot has a width of 1.8mm, said second radiating arm has a length of L2, wherein 40mm +.l2 <62.5mm, said second radiating arm is for radiating and/or receiving electromagnetic waves having a frequency f2, wherein 2400MHz +.f2 +.2500 MHz.

6. The tri-band loop antenna of claim 1 wherein said third radiating segment comprises: a third radiating arm, a third reference ground, and the shunt capacitance;

7. The tri-band loop antenna of claim 6 wherein said third radiating slot has a width of 1.8mm, said third radiating arm has a length L3, wherein 34mm +.l3 <47.5mm, said third radiating arm is for radiating and/or receiving electromagnetic waves having a frequency f3, wherein f3=1575.42 MHz.

8. The tri-band loop antenna of claim 1 wherein said feed point comprises an antenna pin.

9. The tri-band loop antenna of claim 1 wherein said shunt capacitance has a capacitance value of less than 5PF.

10. A mobile terminal, the mobile terminal comprising: the tri-band loop antenna of any of claims 1 to 9.