Multi-antenna synthetic circularly polarized antenna and multi-antenna synthetic orthogonal circularly polarized antenna

Abstract

The utility model relates to a multi-antenna synthetic circularly polarized antenna, which is characterized by comprising a first antenna unit arranged on a first frame of a mobile phone, and the first antenna unit comprises a first horizontal antenna part and a first feed unit, the phase shift unit shifts the phase of a transmission signal of the first antenna or the fourth antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the first antenna is 90 degrees; the second antenna unit is arranged on a second frame, perpendicular to the first frame, of the mobile phone, and the second antenna unit comprises a second horizontal antenna part perpendicular to the first horizontal antenna part and a second feed unit; and the phase shift unit is used for shifting the phase of a transmission signal of the first antenna or the second antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is 90 degrees.

Description

Technical Field

[0001] The present application relates to the field of wireless communications, and more specifically to a multi-antenna synthetic circularly polarized antenna. Background Art

[0002] When linearly polarized electromagnetic waves pass through the atmospheric ionosphere, their polarization plane rotates. In addition, the ground terminal antenna also rotates in direction during movement. Therefore, there is a polarization mismatch problem when using linearly polarized antennas in satellite communication systems. Circular polarization can overcome the above problems well, so satellite communication antennas generally use circular polarization.

[0003] In addition, satellites are hundreds to tens of thousands of kilometers away from the ground, and space losses are large due to long distances. The built-in antenna gain of mobile phone terminals is also difficult to increase due to size and structural limitations. Summary of the invention

[0004] The present application provides a multi-antenna synthetic circular polarization antenna, characterized in that it includes: a first antenna unit, which is arranged on a first frame of a mobile phone, the first antenna unit includes a first horizontal antenna part, and a first feeding unit, which moves the phase of the transmission signal of the first antenna or the fourth antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the first antenna is 90 degrees; a second antenna unit, which is arranged on a second frame of the mobile phone that is perpendicular to the first frame, the second antenna unit includes a second horizontal antenna part that is perpendicular to the first horizontal antenna part, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna or the second antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is 9 0 degrees; a third antenna unit is arranged on a third frame of the mobile phone that is perpendicular to the second frame, the third antenna unit includes a third horizontal antenna part that is perpendicular to the second horizontal antenna part, and a third feeding unit, which is used to move the phase of the transmission signal of the second antenna or the third antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the second antenna is 90 degrees; a fourth antenna unit is arranged on a fourth frame of the mobile phone that is perpendicular to the third frame, the fourth antenna unit includes a fourth horizontal antenna part that is perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna or the third antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the third antenna is 90 degrees.

[0005] The circularly polarized antenna synthesized by multiple linearly polarized antennas has a significantly improved gain compared to the built-in antenna of a mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the invention of the present application, any of the currently described embodiments or preferred methods.

[0007] Figure 1 This is the schematic diagram of a circularly polarized antenna.

[0008] Figure 2 It is a schematic diagram of a single antenna implementation.

[0009] Figure 3 It is a schematic diagram of a four-antenna synthetic circularly polarized antenna.

[0010] Figure 4 It is a two-antenna synthetic circularly polarized antenna.

[0011] Figure 5 It is a data diagram of single antenna gain and axial ratio.

[0012] Figure 6 The relationship between a single antenna 3D pattern and a mobile phone is shown.

[0013] Figure 7 It is the axial ratio and gain diagram of the four-antenna synthetic circularly polarized antenna.

[0014] Figure 8 This is the relationship between the 3D directional pattern after the four antennas are synthesized and the position of the mobile phone.

[0015] Fig. 9 It is the axial ratio and gain diagram of the two-antenna synthetic circularly polarized antenna.

[0016] Fig.10 This is the relationship diagram between the 3D radiation pattern of the right-hand circularly polarized antenna formed by antenna 1 and antenna 2 and the position of the mobile phone.

[0017] Fig.11 It is the left-hand circular polarization pattern synthesized by the two antennas.

[0018] Fig.12 It is a diagram showing the relationship between the left-hand circular polarization 3D radiation pattern formed by antenna 3 and antenna 4 and the position of the mobile phone. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] This design can use two pairs of antennas to form a group to realize two orthogonal circularly polarized antennas, left-handed and right-handed, on the same mobile phone.

[0021] Figure 1 This is the schematic diagram of the circular polarization antenna. The principle and implementation of the circular polarization antenna are introduced below. Four linear polarization antennas are made along the four sides of the mobile phone. By adjusting the phase difference of the four antennas, the phase of the electric field generated by the four antennas is made to lag 90 degrees or lead 90 degrees in sequence, so that right-hand circular polarization or left-hand circular polarization can be formed in the plane normal direction, and left-hand circular polarization or right-hand circular polarization can be formed in the symmetrical direction, and the gain is significantly improved compared to a single antenna.

[0022] Next, we introduce the principle and implementation of orthogonal dual circular polarization antenna. Four antennas are made along the four sides of the mobile phone. Two mutually perpendicular antennas form a group. The phase relationship of the two groups of antennas is 90 degrees ahead and 90 degrees behind. This can generate an orthogonal dual circular polarization antenna with one left-handed and the other right-handed on a mobile phone, and the gain is improved compared to a single antenna. Figure 1 , antenna 1 and antenna 2 are a group, antenna 3 and antenna 4 are a group (antenna 1 and antenna 4 are a group, antenna 2 and antenna 3 can also be a group).

[0023] In one embodiment, a multi-antenna synthetic circular polarization antenna is provided, characterized in that it includes: a first antenna unit, which is arranged on a first frame of a mobile phone, the first antenna unit includes a first horizontal antenna part, and a first feeding unit, which moves the phase of the transmission signal of the first antenna or the fourth antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the first antenna is 90 degrees; a second antenna unit, which is arranged on a second frame of the mobile phone that is perpendicular to the first frame, the second antenna unit includes a second horizontal antenna part that is perpendicular to the first horizontal antenna part, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna or the second antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is is 90 degrees; a third antenna unit is arranged on a third frame of the mobile phone that is perpendicular to the second frame, the third antenna unit includes a third horizontal antenna part that is perpendicular to the second horizontal antenna part, and a third feeding unit, which is used to move the phase of the transmission signal of the second antenna or the third antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the second antenna is 90 degrees; a fourth antenna unit is arranged on a fourth frame of the mobile phone that is perpendicular to the third frame, the fourth antenna unit includes a fourth horizontal antenna part that is perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna or the third antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the third antenna is 90 degrees.

[0024] In another embodiment, a multi-antenna synthetic circularly polarized antenna is provided, including a first antenna unit, a second antenna unit, a third antenna unit, and a fourth antenna unit, which are one of a monopole antenna and an inverted F antenna, and the implementation process is one of a flexible printed circuit antenna, a laser direct forming antenna, or a frame antenna.

[0025] In another embodiment, a multi-antenna synthetic circular polarization antenna is provided, wherein the phase of the mobile feeding unit is a phase shifter or a feeding network, so as to realize left-hand circular polarization or right-hand circular polarization.

[0026] In one embodiment, a multi-antenna synthetic circular polarization antenna is provided, characterized in that it includes: a first antenna unit, which is arranged on a first frame of a mobile phone, the first antenna unit includes a first arc-shaped antenna part and a first horizontal antenna part, and a first feeding unit, which moves the phase of the transmission signal of the first antenna or the fourth antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the first antenna is 90 degrees; a second antenna unit, which is arranged on a second frame of the mobile phone that is perpendicular to the first frame, the second antenna unit includes a second arc-shaped antenna part and a second horizontal antenna part that is perpendicular to the first horizontal antenna part, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna or the second antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is is 90 degrees; a third antenna unit is arranged on a third frame of the mobile phone that is perpendicular to the second frame, the third antenna unit includes a third arc antenna part and a third horizontal antenna part that is perpendicular to the second horizontal antenna part, and a third feeding unit, which is used to move the phase of the transmission signal of the second antenna or the third antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the second antenna is 90 degrees; a fourth antenna unit is arranged on a fourth frame of the mobile phone that is perpendicular to the third frame, the fourth antenna unit includes a fourth arc antenna part and a fourth horizontal antenna part that is perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna or the third antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the third antenna is 90 degrees.

[0027] Figure 2 This is a schematic diagram of a single antenna implementation. The following describes a single antenna implementation. Use one of the sides of the phone frame, either horizontal or vertical, to design a single antenna according to the figure below. The antenna axis is relatively high and has obvious linear polarization characteristics in most angle ranges. For details, see the single antenna gain and axis ratio data chart.

[0028] Figure 3 This is a schematic diagram of a four-antenna synthetic circular polarization antenna. Figure 3 As shown, antennas 1, 2, 3, and 4 are designed respectively. In one embodiment, a phase shifter or a feeding network can be used to generate a phase difference of decreasing by 90° or increasing by 90° to feed the four antennas respectively. In one embodiment, due to changes in the environment in which the mobile phone is located, the phase difference needs to be adjusted, and left-hand circular polarization or right-hand circular polarization can be achieved, which has a significant improvement in gain compared to a single antenna.

[0029] Figure 4 It is a two-antenna synthetic circular polarization antenna. In one embodiment, antennas 1 and 2 form a group, and antennas 3 and 4 form another group. In one embodiment, antennas 1 and 4 form a group, and antennas 2 and 3 form another group. A phase shifter or a feeding network is used between each group of antennas to generate a 90° phase difference, so that a circular polarization antenna can be realized with two antennas.

[0030] In another embodiment, orthogonal dual circular polarization antennas may be used. Figure 4 The two antennas of antenna group 1 (antenna 1, 2) are phase-advanced by 90°, and the two antennas of antenna group 2 (antenna 3, 4) are phase-lagged by 90°, that is, one group of antennas forms a left-hand rotation, and the other group of antennas forms a right-hand rotation, and the two groups are used together to form an orthogonal dual circular polarization antenna. In a MIMO communication system, an orthogonal dual circular polarization antenna can multiply the communication performance. In addition, in another embodiment, the phase of antenna group 1 lags by 90°, and the phase of antenna group 2 leads by 90°.

[0031] In one embodiment, a multi-antenna synthetic orthogonal circular polarization antenna is provided, comprising: a first antenna unit, arranged on a first frame of a mobile phone, the first antenna unit comprising a first horizontal antenna part, and a first feeding unit; a second antenna unit, arranged on a second frame of the mobile phone perpendicular to the first frame, the second antenna unit comprising a second horizontal antenna part perpendicular to the first horizontal antenna part, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is 90 degrees; a third antenna unit, arranged on a third frame of the mobile phone, the third antenna unit comprising a third horizontal antenna part, and a third feeding unit; a fourth antenna unit, arranged on a fourth frame of the mobile phone perpendicular to the third frame, the fourth antenna unit comprising a fourth horizontal antenna part perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the fourth antenna is -90 degrees.

[0032] Figure 5 This is a data diagram of single antenna gain and axial ratio. According to the single antenna structure, the maximum antenna gain is 1.5dBi, the axial ratio is basically above 10dB, and most of the angle range is obviously linearly polarized. For details, see Figure 5 Single antenna axial ratio and gain data.

[0033] Figure 6 The relationship between the 3D radiation pattern of a single antenna and the mobile phone is shown. The gain is low and it is basically an omnidirectional antenna with no obvious directionality, which is consistent with the performance of the built-in antenna of an ordinary mobile phone.

[0034] Figure 7This is the axial ratio and gain diagram of the four-antenna synthetic circular polarization antenna. The four antennas are fed at 0°, 90°, 180°, and 270° to form circular polarization. The axial ratio of the antenna drops below 8.5dB in the range of Theta=90±30°, and the lowest is 4.8dB. The gain of a single antenna is 1.5dBi, and the gain of right-hand circular polarization after synthesis is increased to 6.5dBi (the symmetrical position is left-hand circular polarization). See the red frame range in the figure below for details. The gain is significantly improved and the circular polarization effect is significant.

[0035] Figure 8 This is the relationship between the 3D directional pattern after the four antennas are synthesized and the position of the mobile phone. In this holding position, the circular polarization gain in the zenith direction is 6.5dBi, which is significantly improved and has obvious directivity. The four antennas formed along the four frames of the mobile phone are perpendicular to each other. The phases of the four antennas increase or decrease in sequence to form a rotating excited electric field, which makes the antenna form circular polarization. The superposition of multiple antennas also improves the antenna gain.

[0036] Fig. 9 It is the axial ratio and gain diagram of the two-antenna synthetic circularly polarized antenna.

[0037] Two antennas synthesize right-hand circular polarization. Here, antenna 1 and antenna 2 are used as a group. Antenna 2 lags 90° in phase to form right-hand circular polarization. In the range of Theta = 25° to 170°, there is a good axial ratio and gain. After antenna 1 and antenna 2 are synthesized, the right-hand circular polarization gain is 4.4dBi. The gain and axial ratio data are shown in the red box range in the figure below. The gain is significantly improved and the circular polarization effect is significant.

[0038] Fig.10 The relationship between the 3D radiation pattern of the right-hand circularly polarized antenna formed by antenna 1 and antenna 2 and the position of the mobile phone is as follows: in this holding posture, the right-hand circularly polarized gain in the zenith direction is 4.4dBi.

[0039] Fig.11 This is the left-hand circular polarization diagram of the two antennas. Antenna 3 and antenna 4 are used as a group, and antenna 4 leads the phase by 90° to form left-hand circular polarization. In the range of Theta = 15° to 75°, there is a good axial ratio and gain. After antenna 3 and antenna 4 are combined, the left-hand polarization gain is 3dBi. The gain and axial ratio data are shown in the red box range in the figure below.

[0040] Fig.12 This is the relationship between the left-hand circular polarization 3D pattern formed by antenna 3 and antenna 4 and the position of the mobile phone. In this holding posture, the left-hand circular polarization gain in the zenith direction is 3dBi.

[0041] In another embodiment, orthogonal dual circular polarization antennas can be used. Antennas 1 and 2 form a group, and a feed network or phase shifter is used to form a 90° lagging phase difference. Antennas 3 and 4 form a group, and a feed network or phase shifter is used to form a 90° leading phase difference. In the Theta = 25° to 75° beam overlap area, both groups of antennas have good gain and axial ratio. One group is left-handed and the other group is right-handed to form two orthogonal circular polarization antennas. When the two groups of antennas are used at the same time, orthogonal dual circular polarization is formed, which can double the communication performance in the MIMO communication system.

[0042] In another embodiment, if a single antenna uses other antennas different from those in this example, such as a monopole antenna, an FPC antenna, an LDS antenna, etc., the same effect can be achieved as long as the four antennas are positioned perpendicular to each other and the feeding is decreased or increased in phase.

[0043] In another embodiment, two or more antennas may also be used.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A multi-antenna synthetic circularly polarized antenna, characterized in that: include: A first antenna unit is arranged at a first frame of the mobile phone, and the first antenna unit includes a first horizontal antenna part and a first feeding unit, which moves the phase of the transmission signal of the first antenna or the fourth antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the first antenna is 90 degrees; A second antenna unit is arranged on a second frame of the mobile phone that is perpendicular to the first frame, the second antenna unit includes a second horizontal antenna portion that is perpendicular to the first horizontal antenna portion, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna or the second antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is 90 degrees; a third antenna unit, arranged at a third frame of the mobile phone that is perpendicular to the second frame, the third antenna unit comprising a third horizontal antenna portion that is perpendicular to the second horizontal antenna portion, and a third feeding unit, which is used to move the phase of the transmission signal of the second antenna or the third antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the second antenna is 90 degrees; The fourth antenna unit is arranged on the fourth frame of the mobile phone perpendicular to the third frame. The fourth antenna unit includes a fourth horizontal antenna part perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna or the third antenna so that the phase difference between the transmission signal of the fourth antenna unit and the transmission signal of the third antenna is 90 degrees.

2. The multi-antenna synthetic circularly polarized antenna according to claim 1, characterized in that: The first antenna unit, the second antenna unit, the third antenna unit, and the fourth antenna unit are one of monopole antennas and inverted F antennas, and the implementation process is one of flexible printed circuit antennas, laser direct forming antennas, or frame antennas.

3. The multi-antenna synthetic circularly polarized antenna according to claim 1, characterized in that: The phase of the feeding unit is moved by using a phase shifter or a feeding network to achieve left-hand circular polarization or right-hand circular polarization.

4. A multi-antenna synthetic orthogonal circularly polarized antenna, characterized in that: include: A first antenna unit is arranged on a first frame of the mobile phone, and the first antenna unit includes a first horizontal antenna part and a first feeding unit; A second antenna unit is arranged on a second frame of the mobile phone that is perpendicular to the first frame, the second antenna unit includes a second horizontal antenna portion that is perpendicular to the first horizontal antenna portion, and a second feeding unit, which is used to move the phase of the transmission signal of the first antenna so that the phase difference between the transmission signal of the second antenna unit and the transmission signal of the first antenna is 90 degrees; A third antenna unit is arranged on a third frame of the mobile phone, and the third antenna unit includes a third horizontal antenna part and a third feeding unit; The fourth antenna unit is arranged on the fourth frame of the mobile phone perpendicular to the third frame. The fourth antenna unit includes a fourth horizontal antenna part perpendicular to the third horizontal antenna part, and a fourth feeding unit, which is used to move the phase of the transmission signal of the fourth antenna so that the phase difference between the transmission signal of the third antenna unit and the transmission signal of the fourth antenna is -90 degrees.

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