CN117791090A - Dual-frenquency circular polarization location antenna and wearable electronic equipment - Google Patents

Abstract

The invention relates to the technical field of antennas, and provides a dual-frequency circularly polarized positioning antenna and wearable electronic equipment, wherein the dual-frequency circularly polarized positioning antenna comprises: a first antenna radiator, a second antenna radiator and a circuit board; the first antenna radiator and the second antenna radiator are configured to sequentially extend along the circumferential direction of the electronic equipment body, and the tail end of the first antenna radiator and the head end of the second antenna radiator are coupled in a gap; the circuit board is configured to be arranged on the electronic equipment body, and is provided with a feed terminal, a first grounding terminal and a second grounding terminal; the first ground terminal and the feed terminal are connected at a position between the head end and the tail end of the first antenna radiator, and the second ground terminal is connected with the second antenna radiator. The positioning antenna can realize the circular polarization performance of dual frequency bands at the same time, has strong multipath interference resistance, effectively improves the receiving efficiency and the antenna performance of the positioning antenna, and is beneficial to ensuring the positioning accuracy of the antenna.

Description

Dual-frenquency circular polarization location antenna and wearable electronic equipment

Technical Field

The invention relates to the technical field of electronic equipment, in particular to a dual-frequency circularly polarized positioning antenna and wearable electronic equipment.

Background

With the development of smart wearable devices, satellite positioning functions have become an indispensable function. Commonly used satellite positioning systems include the global satellite positioning system (GPS), the Beidou satellite navigation system (BDS), and the GLONASS. In order to enhance the transmission efficiency of the satellite to the ground (e.g., enhance penetration and coverage, etc.), the transmitting antenna of the satellite to the ground takes the form of circular polarization. Meanwhile, in order to enhance the receiving capability of the positioning antenna, the receiving antenna of the device should also employ the same circularly polarized antenna as the transmitting antenna.

However, in the related art, the intelligent wearable device is limited by volume or industrial design, and is difficult to realize a circular polarized antenna, but a linear polarized antenna is generally adopted, so that satellite positioning performance of the device is poor, and grasping of a motion track is not accurate enough. Although the antenna on part of intelligent wearable equipment can realize the reception of circularly polarized signals, the signal receiving frequency of the antenna is single, and the positioning accuracy of the antenna is difficult to ensure.

Disclosure of Invention

The invention provides a dual-frequency circularly polarized positioning antenna and a wearable electronic device, which are used for solving the problems of single antenna frequency and lower antenna positioning precision of the existing wearable electronic device.

In a first aspect, the present invention provides a dual-frequency circularly polarized positioning antenna comprising: a first antenna radiator, a second antenna radiator and a circuit board;

the first antenna radiator and the second antenna radiator are configured to sequentially extend along the circumferential direction of the electronic equipment body, and the tail end of the first antenna radiator and the head end of the second antenna radiator are coupled in a gap;

the circuit board is configured to be arranged on the electronic equipment body, and a feed terminal, a first grounding terminal and a second grounding terminal are arranged on the circuit board; the first ground terminal and the feed terminal are connected at a position between a head end and a tail end of the first antenna radiator, and the second ground terminal is connected with the second antenna radiator.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, along the extending direction of the first antenna radiator, the distance between the head end of the first antenna radiator and the first grounding terminal is larger than the distance between the feed terminal and the tail end of the first antenna radiator.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, along the extending direction of the first antenna radiator, the distance between the head end of the first antenna radiator and the first grounding terminal is smaller than the distance between the feed terminal and the tail end of the first antenna radiator.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the first antenna radiator and the second antenna radiator are in circular arc shapes, and the first antenna radiator and the second antenna radiator are configured to be circumferentially arranged relative to the center of the electronic equipment body.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the arc length between the head end of the first antenna radiator and the first grounding terminal corresponds to 1/4 working wavelength of the L5 frequency band of the GPS.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the arc length between the feed terminal and the tail end of the first antenna radiator corresponds to 1/4 working wavelength of the L1 frequency band of the GPS.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the arc length of the first antenna radiator between the feed terminal and the tail end of the first antenna radiator is larger than that of the second antenna radiator.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the central angle of the part of the first antenna radiator between the feed terminal and the first grounding terminal relative to the center is 7-13 degrees.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the circuit board is circular and is coaxially arranged with the electronic equipment body;

the first antenna radiator and the second antenna radiator extend along the circumference of the circuit board, and the feed terminal, the first ground terminal and the second ground terminal are arranged along the circumference of the circuit board.

The invention provides a dual-frequency circularly polarized positioning antenna, which further comprises: a third antenna radiator; the third antenna radiator is connected with the circuit board to form a Bluetooth antenna or a wifi antenna; the third antenna radiator is configured to extend in a circumferential direction of the electronic device body and is located between a head end of the first antenna radiator and a tip end of the second antenna radiator.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, one second grounding terminal is arranged, and the second grounding terminal is connected with the head end of the second antenna radiator to form an inverted-L-shaped parasitic antenna;

or the second grounding terminal is provided with one, and the second grounding terminal is connected with the middle part of the second antenna radiator to form a T-shaped parasitic antenna;

or two second grounding terminals are arranged, one of the second grounding terminals is connected with the head end of the second antenna radiator, and the other second grounding terminal is connected with the middle part of the second antenna radiator so as to form an inverted-F parasitic antenna.

According to the dual-frequency circularly polarized positioning antenna provided by the invention, the first antenna radiator and the second antenna radiator are arranged on the same side of the circuit board, and the gap between the first antenna radiator and the circuit board and between the second antenna radiator and the circuit board is configured to be 1-4 mm.

In a second aspect, the present invention also provides a wearable electronic device, comprising: the dual-frequency circularly polarized positioning antenna comprises an electronic equipment body and the dual-frequency circularly polarized positioning antenna which is arranged on the electronic equipment body.

According to the dual-frequency circularly polarized positioning antenna and the wearable electronic device, the first antenna radiator and the second antenna radiator which are sequentially arranged along the circumferential direction of the electronic device body are arranged, and under the condition that the circuit board gives excitation signals to the first antenna radiator through the feed terminal, the first antenna radiator can generate circularly polarized radiation of one frequency band based on resonance of two parts positioned at two sides of the feed terminal, and the first antenna radiator and the second antenna radiator can generate circularly polarized radiation of another frequency band based on resonance between the first antenna radiator and the second antenna radiator, so that the positioning antenna can simultaneously realize the circularly polarized performance of the dual-frequency band, the multipath interference resistance is high, the receiving efficiency and the antenna performance of the positioning antenna are effectively improved, and the positioning accuracy of the antenna is guaranteed.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a dual-frequency circularly polarized positioning antenna provided by the invention;

FIG. 2 is an S11 graph of the dual-frequency circularly polarized positioning antenna provided by the invention;

FIG. 3 is a graph showing the axial ratio of a radiation signal of a dual-frequency circularly polarized positioning antenna according to the present invention as a function of frequency;

FIG. 4 is a right-hand circularly polarized component direction diagram of a radiation signal of the dual-frequency circularly polarized positioning antenna in a GPS L5 frequency band;

FIG. 5 is a right-hand circularly polarized component direction diagram of a radiation signal of the dual-frequency circularly polarized positioning antenna in a GPS L1 frequency band;

FIG. 6 is a schematic diagram of orthogonal current components generated by the dual-band circularly polarized positioning antenna in the GPS L5 frequency band;

FIG. 7 is a schematic diagram of orthogonal current components generated by the dual-band circularly polarized positioning antenna in the GPS L1 frequency band;

reference numerals:

100. a circuit board;

1. a first antenna radiator; 11. a first ground terminal; 12. a power supply terminal;

2. a second antenna radiator; 21. and a second ground terminal.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The dual-band circularly polarized positioning antenna and the wearable electronic device provided by the embodiment of the invention are described in detail below with reference to fig. 1 to 7 through specific embodiments and application scenarios thereof.

In a first aspect, as shown in fig. 1, an embodiment of the present invention provides a dual-frequency circularly polarized positioning antenna, including: a first antenna radiator 1, a second antenna radiator 2 and a circuit board 100.

The first antenna radiator 1 and the second antenna radiator 2 are configured to be disposed to extend in the circumferential direction of the electronic device body in order, and the tip of the first antenna radiator 1 and the head of the second antenna radiator 2 are coupled in a slit.

The circuit board 100 is configured to be provided on the electronic device body, and the circuit board 100 is provided with a power supply terminal 12, a first ground terminal 11, and a second ground terminal 21; the first ground terminal 11 and the feed terminal 12 are connected to a position between the head end and the tail end of the first antenna radiator 1, and the second ground terminal 21 is connected to the second antenna radiator 2.

It can be appreciated that the dual-frequency circularly polarized positioning antenna shown in this embodiment can be applied to a wearable electronic device and disposed on an electronic device body of the wearable electronic device. The wearable electronic device may be a smart watch, a smart bracelet, or the like.

The electronic device body may be a circular body, a rectangular body, and a regular polygon body with sides greater than four, which is not particularly limited. The first antenna radiator 1 and the second antenna radiator 2 are adaptively arranged according to the shape of the periphery of the electronic apparatus body, respectively, and the first antenna radiator 1 and the second antenna radiator 2 are sequentially arranged along the circumferential direction of the electronic apparatus body.

In practical application, the metal frames such as the decorative ring and the fixing ring around the electronic device body can be directly used as the first antenna radiator 1 or the second antenna radiator 2, so that the integrated design of the dual-frequency circularly polarized positioning antenna on the wearable electronic device is realized.

The circuit board 100 may be a printed circuit board (Printed circuit boards, PCB) as known in the art, and a feeding module is disposed on the circuit board 100, and the feeding module is electrically connected to the first antenna radiator 1 through the feeding terminal 12. The circuit board 100 is further provided with a grounding module, which can be electrically connected with the first grounding terminal 11 through a first capacitor, and can be electrically connected with the second grounding terminal 21 through a second capacitor.

As shown in fig. 1, the dual-frequency circularly polarized positioning antennas shown in the present embodiment are set to be distributed in a three-dimensional space constructed by an x-axis, a y-axis and a z-axis, the x-axis, the y-axis and the z-axis being perpendicular to each other, and the circuit board 100 is disposed parallel to the front surface of the electronic device body and distributed in a plane formed by the x-axis and the y-axis.

The AD section is set as a first antenna radiator 1, the point A is used as the head end of the first antenna radiator 1, and the point D is used as the tail end of the first antenna radiator 1; the EF section is set as the second antenna radiator 2, the point e is the head end of the second antenna radiator 2, and the point F is the end of the second antenna radiator 2.

Meanwhile, points A and D of the AD section are in an open circuit state of the circuit board 100, point B is a grounding point of the first antenna radiator 1, and point C is a feeding point of the first antenna radiator 1; the F point of the EF section is in an open circuit state with respect to the circuit board 100, and the E point is a ground point of the second antenna radiator 2.

Wherein the end of the first antenna radiator 1 and the head end of the second antenna radiator 2 are close to each other and form a slot so as to resonate by a coupling effect, so that an excitation signal on the CD section can be loaded to the EF section through the slot. In practical application, the coupling degree between the CD section and the EF section can be adjusted by adjusting the width of the gap between the tail end of the first antenna radiator 1 and the head end of the second antenna radiator 2, so as to realize the matching tuning of the antennas.

As shown in fig. 1 and 6, in the case where the circuit board 100 feeds the first antenna radiator 1 through the feed terminal 12, the first antenna radiator 1 operates in a differential mode and a common mode under the excitation of a feed signal.

Specifically, when the first antenna radiator 1 works in the differential mode, the current flow direction of the AB section is a point a to a point B, and the current flow direction of the CD section is a point C to a point D, that is, the current on the first antenna radiator 1 flows through the point a, the point B, the point C and the point D in sequence, and no commutation is generated; at this time, the current of the AB segment is distributed in the second quadrant of the xy coordinate plane, and has a horizontal component in the negative direction of the y-axis and a vertical component in the positive direction of the x-axis; the current of the CD segment is distributed in a first quadrant of the xy coordinate plane and has a horizontal component along the positive direction of the y-axis and a vertical component along the positive direction of the x-axis; the horizontal component of the current in the AB section and the horizontal component of the current in the CD section cancel each other out to some extent, and the vertical component of the current in the AB section and the vertical component of the current in the CD section overlap each other to some extent, so that the equivalent current of the first antenna radiator 1 faces the positive direction of the x-axis when operating in the differential mode.

When the first antenna radiator 1 works in the common mode, the current flow direction of the AB section is A point to B point, the current flow direction of the CD section is D point to C point, namely the current on the first antenna radiator 1 is commutated; at this time, the current of the AB segment is distributed in the second quadrant of the xy coordinate plane, and has a horizontal component in the negative direction of the y-axis and a vertical component in the positive direction of the x-axis; the current of the CD segment is distributed in the third quadrant of the xy coordinate plane and has a horizontal component along the negative direction of the y-axis and a vertical component along the negative direction of the x-axis; the vertical component of the current in the AB section and the vertical component of the current in the CD section cancel each other out to some extent, and the horizontal component of the current in the AB section and the horizontal component of the current in the CD section overlap each other to some extent, so that the equivalent current of the first antenna radiator 1 faces the negative direction of the y-axis when operating in the common mode.

Thus, in the case where the circuit board 100 is fed to the first antenna radiator 1 through the feed terminal 12, the first antenna radiator 1 can perform resonance in the orthogonal mode, and the CD section serves as a parasitic antenna of the AB section, the AB section and the CD section resonate in the vicinity of the operating frequency point, the current amplitudes of the AB section and the CD section are equal, the current phases of the AB section and the CD section differ by 90 °, and circular polarized radiation can be generated.

As shown in fig. 1 and 7, the CD section and the EF section can also operate in a differential mode and a common mode in the case where the circuit board 100 feeds the first antenna radiator 1 through the feed terminal 12.

Specifically, when the CD section and the EF section operate in the differential mode, the current flow direction of the CD section is C point to D point, and the current flow direction of the EF section is E point to F point, i.e. the current on the CD section and the EF section does not generate commutation; at this time, the current of the CD segment is distributed in the first quadrant of the xy coordinate plane, and has a horizontal component in the positive direction of the y-axis and a vertical component in the positive direction of the x-axis; the current of EF section is distributed in the fourth quadrant of xy coordinate plane and has horizontal component along positive direction of y-axis and vertical component along negative direction of x-axis; the vertical component of the current of the CD section and the vertical component of the current of the EF section are offset to some extent, and the horizontal component of the current of the CD section and the horizontal component of the current of the EF section are superimposed to some extent, so that when the CD section and the EF section operate in the differential mode, the equivalent current of the CD section and the EF section faces the positive direction of the y axis.

When the CD section and the EF section work in the common mode, the current flow direction of the CD section is C point-D point, and the current flow direction of the EF section is F point-E point, namely the current on the CD section and the EF section generates commutation; at this time, the current of the CD segment is distributed in the first quadrant of the xy coordinate plane, and has a horizontal component in the positive direction of the y-axis and a vertical component in the positive direction of the x-axis; the current of EF section is distributed in the second quadrant of xy coordinate plane and has horizontal component along negative direction of y-axis and vertical component along positive direction of x-axis; the horizontal component of the current of the CD section and the horizontal component of the current of the EF section are offset to some extent, and the vertical component of the current of the CD section and the vertical component of the current of the EF section are superimposed to some extent, so that when the CD section and the EF section operate in the differential mode, the equivalent current of the CD section and the EF section faces the positive direction of the x axis.

Thus, in the case where the circuit board 100 is fed to the first antenna radiator 1 through the feed terminal 12, the CD section and the EF section can perform resonance in an orthogonal mode, and the EF section serves as a parasitic antenna of the CD section, the CD section and the EF section resonate in the vicinity of the operating frequency point, the current amplitudes of the CD section and the EF section are equal, the current phases of the CD section and the EF section differ by 90 °, and circular polarized radiation can be generated.

In some embodiments, the distance between the head end of the first antenna radiator 1 and the first ground terminal 11 may be set to be smaller than the distance between the feed terminal 12 and the tail end of the first antenna radiator 1 along the extending direction of the first antenna radiator 1, so that the AB section of the first antenna radiator 1 implements right-hand circularly polarized radiation of the GPS L5 band, and the CD section of the first antenna radiator 1 implements right-hand circularly polarized radiation of the GPS L1 band.

Accordingly, in this embodiment, by setting the distance between the head end of the first antenna radiator 1 and the first ground terminal 11 to be greater than the distance between the feed terminal 12 and the tail end of the first antenna radiator 1 along the extending direction of the first antenna radiator 1, the AB segment of the first antenna radiator 1 realizes the left-hand circularly polarized radiation of the GPS L5 band, and the CD segment of the first antenna radiator 1 realizes the left-hand circularly polarized radiation of the GPS L1 band.

It should be noted that the GPS satellite navigation system uses carrier frequency signals of three frequency bands in total, and the three frequency bands are all in the L frequency band of the radio spectrum and are divided into an L1 frequency band, an L2 frequency band and an L5 frequency band in sequence.

Wherein, the frequency range corresponding to the GPS L1 frequency band is 1575.42+ -1.023 MHz, and the frequency range corresponding to the GPS L5 frequency band is 1176.45+ -1.023 MHz.

As can be seen from the above, in the dual-band circularly polarized positioning antenna shown in the present embodiment, by arranging the first antenna radiator 1 and the second antenna radiator 2 that extend in sequence along the circumferential direction of the electronic device body, when the circuit board 100 gives an excitation signal to the first antenna radiator 1 through the feed terminal 12, not only can the first antenna radiator 1 generate circular polarized radiation of one frequency band based on the resonance of two portions located at two sides of the feed terminal 12, but also circular polarized radiation of another frequency band based on the resonance between the first antenna radiator 1 and the second antenna radiator 2 can be generated, so that the positioning antenna shown in the present invention can simultaneously realize the circular polarized performance of the dual frequency band, not only has strong anti-multipath interference capability, effectively improves the receiving efficiency and the antenna performance of the antenna, but also is beneficial to ensuring the accuracy of the positioning of the antenna.

In some embodiments, as shown in fig. 1, considering that the signals sent by the navigation satellites reach the ground mostly in the form of right-hand circularly polarized signals after passing through the ionosphere, in order to ensure that the dual-frequency circularly polarized positioning antenna can receive the signals sent by the navigation satellites, the distance between the front end of the first antenna radiator 1 and the first ground terminal 11 is smaller than the distance between the feed terminal 12 and the end of the first antenna radiator 1 along the extending direction of the first antenna radiator 1.

Obviously, by configuring the layout positions of the first grounding terminal 11 and the feeding terminal 12 relative to the first antenna radiator 1 so that the equivalent length of the AB section is greater than that of the CD section, the positioning antenna shown in the embodiment can be ensured to simultaneously realize double right-hand circularly polarized radiation of the GPS L5 frequency band and the GPS L1 frequency band.

In some embodiments, as shown in fig. 1, the first antenna radiator 1 and the second antenna radiator 2 are each in a circular arc shape, and the first antenna radiator 1 and the second antenna radiator 2 are configured to be circumferentially arranged with respect to the center of the electronic device body.

It can be understood that, for electronic device bodies of wearable devices such as smart watches and bracelets, the first antenna radiator 1 and the second antenna radiator 2 are generally configured in a disc shape, so that the first antenna radiator 1 and the second antenna radiator 2 are arranged in a circular arc shape, so that the first antenna radiator 1 and the second antenna radiator 2 extend along the circumferential direction of the electronic device body, the design is not only beneficial to ensuring the aesthetic property of the wearable device, but also can utilize the inherent metal frame on the electronic device body to construct the first antenna radiator 1 and the second antenna radiator 2 shown in the embodiment, so as to realize compact combination of the positioning antenna and the electronic device body.

In some embodiments, the arc length between the head end of the first antenna radiator 1 and the first ground terminal 11 corresponds to 1/4 of the operating wavelength of the L5 band of GPS.

The arc length between the feed terminal 12 and the end of the first antenna radiator 1 corresponds to 1/4 of the operating wavelength of the L1 band of the GPS.

It can be understood that, as shown in fig. 1, in this embodiment, by setting the equivalent length of the AB segment to be substantially equal to 1/4 of the operating wavelength of the L5 band of the GPS, the frequency point corresponding to the L5 band of the GPS can be ensured for the AB segment resonance.

Meanwhile, in this embodiment, by setting that the equivalent length of the CD segment is substantially equal to 1/4 of the operating wavelength of the L1 band of the GPS, the frequency point corresponding to the L1 band of the GPS at which the CD segment resonates can be ensured.

Specifically, the present embodiment illustrates in fig. 2 an S11 curve obtained by simulation of the positioning antenna without any matching device added. Wherein, S11 curve is used for representing the return loss characteristic of positioning antenna.

According to the curve shown in fig. 2, the gain of the positioning antenna reaches a peak value, specifically-5.385637 dB, near the frequency of 1.182GHz, that is, the positioning antenna shown in this embodiment resonates near the frequency of 1.182GHz, and can realize right-hand circularly polarized radiation in the L5 frequency band of the GPS based on the AB segment, so as to realize good reception of the navigation satellite signal.

According to the graph shown in fig. 2, the gain of the positioning antenna reaches another peak value, specifically-4.663845 dB, near the frequency of 1.60867GHz, that is, the positioning antenna shown in this embodiment resonates near the frequency of 1.60867GHz, and can realize right-hand circularly polarized radiation in the GPS L1 frequency band based on the CD segment, so as to realize good reception of the navigation satellite signal.

Further, as shown in fig. 3, when the angle phi=0° in the azimuth plane and the angle they=45° in the elevation plane, the positioning antenna is in the L1 band (1.612951 GHz) of the GPS with an axial ratio of 3.060695dB, and the positioning antenna is in the L5 band (1.22 GHz) of the GPS with an axial ratio of 4.157729dB.

Therefore, the positioning antenna in the embodiment realizes the requirement that the axial ratio is smaller than 6dB in both the L1 frequency band and the L5 frequency band of the GPS, has good axial ratio characteristics and better right-hand circular polarization characteristics, and meets the performance requirement of the positioning antenna.

Further, according to the direction diagram shown in fig. 4, the radiation signal of the positioning antenna in the frequency band of 1.18GHz in this embodiment achieves better right-hand circular polarization. The main lobe amplitude of the directional diagram is 0.403, the angle of the main lobe direction is 41 degrees, the angle width of the main lobe is 111.6 degrees, and the side lobe amplitude is-3.3 dB.

According to the pattern shown in fig. 5, the radiation signal of the positioning antenna in the frequency band of 1.6GHz in this embodiment also achieves better right-hand circular polarization. The main lobe amplitude of the directional diagram is 1.21, the angle of the main lobe direction is 6 degrees, the angle width of the main lobe is 94.4 degrees, and the side lobe amplitude is-5.2 dB.

In some embodiments, as shown in fig. 1, the arc length of the first antenna radiator 1 between the feed terminal 12 and the end of the first antenna radiator 1 is greater than the arc length of the second antenna radiator 2.

It can be understood that, in this embodiment, by setting the equivalent length of the CD segment to be greater than that of the EF segment, when the CD segment and the EF segment are coupled by the slot, it can be ensured that the EF segment resonates in a capacitive loading manner with respect to the CD segment, and the design more easily excites the right-hand circular polarization performance of the CD segment.

In some embodiments, as shown in fig. 1, the circuit board 100 in this embodiment is circular and is disposed coaxially with the electronic device body.

The first antenna radiator 1 and the second antenna radiator 2 are disposed to extend in the circumferential direction of the circuit board 100, and the feed terminal 12, the first ground terminal 11, and the second ground terminal 21 are disposed in this order in the circumferential direction of the circuit board 100.

In order to ensure that the positioning antenna generates double right-handed circularly polarized radiation based on the AB segment and the CD segment more stably, the present embodiment may provide that the central angle of the portion of the first antenna radiator 1 between the feed terminal 12 and the first ground terminal 11 is 7 ° to 13 ° with respect to the center of the electronic device body. Namely, the central angle of the BC segment on the first antenna radiator 1 relative to the center of the electronic equipment body is 7-13 degrees.

In practical applications, the present embodiment may specifically set the central angle of the BC segment with respect to the center of the electronic device body to be 7 °, 8 °, 10 °, 12 °, 13 °, and the like, which is not limited specifically.

In some embodiments, the positioning antenna shown in this embodiment further includes: a third antenna radiator; the third antenna radiator is not specifically illustrated in fig. 1.

The third antenna radiator is connected with the circuit board 100 to form a bluetooth antenna or a wifi antenna; the third antenna radiator is configured to extend in the circumferential direction of the electronic device body and is located between the head end of the first antenna radiator 1 and the tip end of the second antenna radiator 2.

It can be appreciated that, this embodiment can also utilize the vacant space between the first antenna radiator 1's head end and the second antenna radiator 2's end, carry out bluetooth antenna or wifi antenna's layout to make wearable electronic equipment realize short distance communication and locate function based on bluetooth antenna or wifi antenna.

In this embodiment, the layout of the third antenna radiator may also be implemented by using a metal frame on the periphery of the electronic device body, which is not described here in detail.

In practical applications, the second antenna radiator 2 may be disposed in various parasitic antenna forms with respect to the circuit board 100, as follows:

in some examples, the second ground terminal 21 is provided with one, and the second ground terminal 21 and the head end of the second antenna radiator 2 are connected to form an inverted-L parasitic antenna.

In some examples, the second ground terminal 21 is provided with one, and the second ground terminal 21 and the middle portion of the second antenna radiator 2 are connected to form a T-type parasitic antenna.

In some examples, the second ground terminals 21 are provided in two, one of the second ground terminals 21 being connected to the head end of the second antenna radiator 2, and the other second ground terminal 21 being connected to the middle of the second antenna radiator 2 to form an inverted-F parasitic antenna.

It should be noted here that, in this embodiment, the end of the first antenna radiator 1 and the head end of the second antenna radiator 2 are slot-coupled, so that the coupling degree of various parasitic antennas can be adjusted by adjusting the slots, and matching tuning can be realized more easily by using slot coupling feeding.

In some embodiments, as shown in fig. 1, the first and second antenna radiators 1 and 2 are provided on the same side of the circuit board 100, and a gap between the first and second antenna radiators 1 and 2 and the circuit board 100 is configured to be 1 to 4mm.

It is understood that, in the case that the circuit board 100 is disposed horizontally, the first antenna radiator 1 and the second antenna radiator 2 are disposed on the upper side of the circuit board 100, respectively, and the first antenna radiator 1 and the second antenna radiator 2 may be disposed at the same height with respect to the circuit board 100, so as to ensure that a uniform gap is formed between the first antenna radiator 1 and the second antenna radiator 2 and the circuit board 100.

The width of the gap shown in this embodiment may be 1mm, 2mm, 3mm or 4mm, which is not particularly limited.

In a second aspect, the present invention also provides a wearable electronic device, comprising: the electronic equipment body and the double-frequency circularly polarized positioning antenna arranged on the electronic equipment body.

It can be understood that, since the wearable electronic device includes the dual-frequency circularly polarized positioning antenna, and the specific structure of the dual-frequency circularly polarized positioning antenna refers to the above embodiment, the wearable electronic device of this embodiment includes all the technical solutions of the above embodiment, so at least all the beneficial effects obtained by all the technical solutions of the above embodiment are not described in detail herein.

The wearable electronic device can be an intelligent watch, an intelligent bracelet and the like, the electronic device body is a dial plate on the wearable electronic device, and the electronic device body can be circular or rectangular in shape, which is not particularly limited.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the invention has been described in detail with reference to the foregoing embodiments, it will be appreciated by those skilled in the art that variations may be made in the techniques described in the foregoing embodiments, or equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A dual-band circularly polarized positioning antenna, comprising: a first antenna radiator, a second antenna radiator and a circuit board;

the first antenna radiator and the second antenna radiator are configured to sequentially extend along the circumferential direction of the electronic equipment body, and the tail end of the first antenna radiator and the head end of the second antenna radiator are coupled in a gap;

the circuit board is configured to be arranged on the electronic equipment body, and a feed terminal, a first grounding terminal and a second grounding terminal are arranged on the circuit board; the first ground terminal and the feed terminal are connected at a position between a head end and a tail end of the first antenna radiator, and the second ground terminal is connected with the second antenna radiator.

2. The dual-band circularly polarized positioning antenna of claim 1, wherein a distance between a head end of the first antenna radiator and the first ground terminal is greater than a distance between the feed terminal and a tail end of the first antenna radiator along an extension direction of the first antenna radiator.

3. The dual-band circularly polarized positioning antenna of claim 1, wherein a distance between a head end of the first antenna radiator and the first ground terminal is smaller than a distance between the feed terminal and a tip end of the first antenna radiator in an extending direction of the first antenna radiator.

4. The dual-band circularly polarized positioning antenna of claim 1, wherein the first antenna radiator and the second antenna radiator are each in a circular arc shape, and the first antenna radiator and the second antenna radiator are configured to be circumferentially arranged with respect to a center of the electronic device body.

5. The dual-band circularly polarized positioning antenna of claim 4, wherein an arc length between the head end of the first antenna radiator and the first ground terminal corresponds to 1/4 of an operating wavelength of an L5 band of GPS.

6. The dual-band circularly polarized positioning antenna of claim 4, wherein an arc length between the feed terminal and the end of the first antenna radiator corresponds to 1/4 of an operating wavelength of an L1 band of GPS.

7. The dual-band circularly polarized positioning antenna of claim 4, wherein an arc length of the first antenna radiator between the feed terminal and the end of the first antenna radiator is greater than an arc length of the second antenna radiator.

8. The dual-band circularly polarized positioning antenna of claim 4, wherein a portion of the first antenna radiator between the feed terminal and the first ground terminal is at a central angle of 7 ° to 13 ° with respect to the center.

9. The dual-frequency circularly polarized positioning antenna of any of claims 1-8, further comprising: a third antenna radiator;

the third antenna radiator is connected with the circuit board to form a Bluetooth antenna or a wifi antenna; the third antenna radiator is configured to extend in a circumferential direction of the electronic device body and is located between a head end of the first antenna radiator and a tip end of the second antenna radiator.

10. The dual-band circularly polarized positioning antenna as claimed in any one of claims 1 to 8, wherein the second ground terminal is provided with one, and the second ground terminal is connected to the head end of the second antenna radiator to form an inverted-L parasitic antenna;

or the second grounding terminal is provided with one, and the second grounding terminal is connected with the middle part of the second antenna radiator to form a T-shaped parasitic antenna;

or two second grounding terminals are arranged, one of the second grounding terminals is connected with the head end of the second antenna radiator, and the other second grounding terminal is connected with the middle part of the second antenna radiator so as to form an inverted-F parasitic antenna.

11. The dual-band circularly polarized positioning antenna of any one of claims 1 to 8, wherein the first and second antenna radiators are disposed on the same side of the circuit board, and a gap between the first and second antenna radiators and the circuit board is configured to be 1-4 mm.

12. A wearable electronic device, comprising: an electronic device body and a dual-frequency circularly polarized positioning antenna according to any one of claims 1 to 11 provided to the electronic device body.