High-gain double-fed double-frequency omnidirectional array antenna

Abstract

The invention discloses a high-gain double-fed double-frequency omnidirectional array antenna, which comprises a first antenna unit arranged on the front surface of a substrate and a second antenna unit arranged on the back surface of the substrate, and is characterized in that the first antenna unit comprises a plurality of dipole units which are connected in series through a first coaxial cable; the second antenna unit comprises a plurality of dipole units which are connected in series by a second coaxial cable; and the central positions of at least one pair of dipole units of the first antenna unit and the second antenna unit correspondingly coincide on the front surface and the back surface of the substrate. According to the invention, the two antenna units formed by series feed connection of the coaxial cables are respectively arranged on the two surfaces of the substrate, interference is reduced, the centers of part of the dipole units coincide, the isolation degree is increased, dual-frequency signal isolation is realized without a duplexer, and the space is saved.

Description

Technical Field

[0001] The invention relates to an omnidirectional array antenna, belonging to the technical field of antennas. Background Art

[0002] With the rapid development of communication and electronic technology, various antennas have been widely used in terminal devices such as smartphones, navigation, and wireless routers. The styles and specifications of antennas are mostly designed according to the performance of the terminal devices used. Currently, most existing antennas are 2.4GHz single-frequency antennas or 2.4 / 5GHz dual-frequency antennas. Dual-frequency antennas generally require circuit components such as duplexers to achieve isolation of two frequency signals, which increases the complexity of the antenna structure and also increases the manufacturing cost. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, the present invention provides a high-gain dual-feed dual-frequency omnidirectional array antenna, the purpose of which is to achieve isolation of two frequency signals of the dual-frequency antenna without using a duplexer.

[0004] The technical solution of the present invention is as follows: a high-gain dual-feed dual-frequency omnidirectional array antenna, comprising a first antenna unit arranged on the front side of a substrate and a second antenna unit arranged on the back side of the substrate, the first antenna unit comprising a plurality of dipole units connected by first coaxial cable series feeding, the second antenna unit comprising a plurality of dipole units connected by second coaxial cable series feeding, and the first antenna unit and the second antenna unit having at least one pair of dipole units whose center positions overlap correspondingly on the front side and the back side of the substrate.

[0005] Furthermore, the plurality of dipole units of the first antenna unit are fed in phase with respect to the center frequency.

[0006] Furthermore, the plurality of dipole units of the second antenna unit are fed in phase with respect to the center frequency.

[0007] Furthermore, the first antenna unit includes a first dipole unit, a second dipole unit and a third dipole unit which are arranged in sequence in a series-feed connection order, and the second antenna unit includes a fourth dipole unit and a fifth dipole unit which are arranged in sequence in a series-feed connection order, and the center positions of the second dipole unit and the fifth dipole unit overlap correspondingly on the front and back sides of the substrate.

[0008] Further, the first coaxial cable includes a first cable segment and a second cable segment, the first dipole unit is provided with a first electrical connection point and two first dipoles, the shielding wires of the first cable segment and the second cable segment are respectively connected to a first dipole of the first dipole unit, and the core wires of the first cable segment and the second cable segment are commonly connected to the first electrical connection point.

[0009] Furthermore, the second dipole unit includes two second dipoles, the shielding line of the second cable segment is divided into a first part and a second part, and the first part and the second part are respectively connected to a second dipole of the second dipole unit.

[0010] Furthermore, the second coaxial cable includes a third cable segment and a fourth cable segment, the fourth dipole unit is provided with a second electrical connection point and two fourth dipoles, the shielding wires of the third cable segment and the fourth cable segment are respectively connected to a fourth dipole of the fourth dipole unit, and the core wires of the first cable segment and the second cable segment are commonly connected to the second electrical connection point.

[0011] Furthermore, the first coaxial cable and the second coaxial cable are located opposite to each other on the front and back sides of the substrate.

[0012] Furthermore, the first antenna unit operates in a 5 GHz frequency band, and the second antenna unit operates in a 2.4 GHz frequency band.

[0013] Furthermore, the substrate is a PCB substrate.

[0014] Compared with the prior art, the advantages of the technical solution provided by the present invention are: The present invention adopts coaxial cable series feeding connection to form antenna units for two working frequencies, and they are respectively located on the front and back sides of the substrate. The center positions of some dipole units of the two antenna units are overlapped in a corresponding manner, which reduces interference and enhances signal isolation. No duplexer is required to save space and cost. The dipole units of the two antenna units are connected by coaxial cable series feeding. The center frequency between each dipole unit is fed in phase. The in-phase electromagnetic waves are radiated in the air to form a superposition effect, and the gain is strengthened to form an omnidirectional field type.

[0015] In summary, the present invention can achieve a higher isolation without additionally setting up circuit devices such as a duplexer, obtain better gain and omnidirectionality, and has the advantages of low cost and easy mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front structural schematic diagram of the high-gain dual-feed dual-frequency omnidirectional array antenna of an embodiment.

[0017] Figure 2 It is a schematic diagram of the back structure of the high-gain dual-feed dual-frequency omnidirectional array antenna of an embodiment.

[0018] Figure 3 Schematic diagram of the distribution of dipole units of the first antenna unit.

[0019] Figure 4Schematic diagram of the dipole unit distribution of the second antenna unit.

[0020] Figure 5 It is a schematic diagram of the overlapping position of the dipole unit of the first antenna unit and the dipole unit of the second antenna unit.

[0021] Figure 6 Schematic diagram of the structure of a first coaxial cable.

[0022] Figure 7 Schematic diagram of the structure of a second coaxial cable. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading this description, various equivalent modifications to this description by those skilled in the art fall within the scope defined by the claims attached to this application.

[0024] Please combine Figures 1 to 5 As shown, the high-gain dual-feed dual-frequency omnidirectional array antenna of this embodiment includes a first antenna unit 1 and a second antenna unit 2, wherein the first antenna unit 1 and the second antenna unit 2 are antenna units operating in two different frequency bands. The first antenna unit 1 and the second antenna unit 2 are respectively located on the front and back of a substrate 3. The substrate 3 can be made of various types of substrate 3 materials in the prior art antenna, for example, in this embodiment, a PCB substrate 3 is used.

[0025] The first antenna unit 1 is composed of a plurality of dipole units connected by a first coaxial cable 104 in a series-feeding manner, and similarly, the second antenna unit 2 is composed of a plurality of dipole units connected by a second coaxial cable 203 in a series-feeding manner. It can be understood that the first coaxial cable 104 and the plurality of dipole units of the first antenna unit 1 are all located on the front side of the substrate 3, and the second coaxial cable 203 and the plurality of dipole units of the second antenna unit 2 are all located on the back side of the substrate 3. Among them, the center positions of the first antenna unit 1 and a dipole unit and the second antenna unit 2 are exactly coincident on the front side and the back side of the substrate 3. By means of the coaxial cable series-feeding arranged on both sides of the substrate 3 and having a group of dipole units with correspondingly coincident positions, the signal isolation between the two antenna units can be enhanced, mutual interference can be reduced, and dual-frequency operation without a duplexer can be realized.

[0026] In this embodiment, please combine Figures 3 to 5As shown, the first antenna unit 1 has three dipole units, namely, a first dipole unit 101, a second dipole unit 102 and a third dipole unit 103 arranged in sequence, wherein the first dipole unit 101 includes two first dipoles 101a and a first electrical connection point 101b, the second dipole unit 102 includes two second dipoles 102a, and the third dipole unit 103 includes two third dipoles 103a. The second antenna unit 2 has two dipole units, namely, a fourth dipole unit 201 and a fifth dipole unit 202 arranged in sequence, wherein the fourth dipole unit 201 includes two fourth dipoles 201a and a second electrical connection point 201b, and the fifth dipole unit 202 includes two fifth dipoles 202a. The shape of the dipole in each dipole unit is determined according to the operating frequency and the antenna polarization direction. In this embodiment, the first antenna unit 1 operates in the 5 GHz frequency band, and the second antenna unit 2 operates in the 2.4 GHz frequency band. The center positions of the second dipole unit 102 and the fifth dipole unit 202 coincide with each other on the front and back sides of the substrate 3 .

[0027] Please combine Figure 6 and Figure 7 As shown, on the front side of the substrate 3, the first dipole unit 101, the second dipole unit 102 and the third dipole unit 103 are connected in series in sequence by the first coaxial cable 104, and on the back side of the substrate 3, the fourth dipole unit 201 and the fifth dipole unit 202 are connected in series in sequence by the second coaxial cable 203. The first coaxial cable 104 and the second coaxial cable are opposite to each other on the front side and the back side of the substrate 3.

[0028] The first coaxial cable 104 includes a first cable segment 1041 and a second cable segment 1042, wherein a core wire 1041a at a first end of the first cable segment 1041 is connected to a first electrical connection point 101b, and a shield wire 1041b at a first end of the first cable segment 1041 is connected to a first dipole 101a of the first dipole unit 101 far from the second dipole unit 102. A core wire 1042a at a first end of the second cable segment 1042 is connected to the first electrical connection point 101b, and a shield wire 1042b at a first end of the second cable segment 1042 is connected to a first dipole 101a of the first dipole unit 101 near the second dipole unit 102. The core wire 1042c at the second end of the second cable segment 1042 is connected to the third dipole 103a of the third dipole unit 103 away from the second dipole unit 102, and the shielding wire 1042d at the second end of the second cable segment 1042 is connected to the third dipole 103a of the third dipole unit 103 close to the second dipole unit 102. The middle portion of the second cable segment 1042 corresponding to the position of the second dipole unit 102 is stripped, that is, a portion of the annular shielding wire is removed to divide the shielding wire into two unconnected parts, and the two shielding wires 1042e are respectively connected to one of the second dipoles 102a in the second dipole unit 102.

[0029] The second coaxial cable 203 includes a third cable segment 2031 and a fourth cable segment 2032, wherein a core wire 2031a at a first end of the third cable segment 2031 is connected to the second electrical connection point 201b, and a shield wire 2031b at a first end of the third cable segment 2031 is connected to a fourth dipole 201a of the fourth dipole unit 201 far from the fifth dipole unit 202. A core wire 2032a at a first end of the fourth cable segment 2032 is connected to the second electrical connection point 201b, and a shield wire 2032b at a first end of the fourth cable segment 2032 is connected to a fourth dipole 201a of the fourth dipole unit 201 close to the fifth dipole unit 202. The core wire 2032 c of the second end of the fourth cable segment 2032 is connected to the fifth dipole 202 a of the fifth dipole unit 202 away from the fourth dipole unit 201 , and the shielding wire 2032 d of the second end of the fourth cable segment 2032 is connected to the fifth dipole 202 a of the fifth dipole unit 202 close to the fourth dipole unit 201 .

[0030] It should be noted that it is not necessary for the first coaxial cable 104 and the second coaxial cable 203 to be segmented. For example, the first coaxial cable 104 can also be stripped multiple times so that the two first dipoles are connected to the shielding wire of the first coaxial cable 104 respectively. In this case, it is not necessary to set the first electrical connection point 101b in the first dipole unit 101. The second coaxial cable 203 can also be stripped multiple times so that the two fourth dipoles are connected to the shielding wire of the second coaxial cable 203 respectively. In this case, it is not necessary to set the second electrical connection point 201b in the fourth dipole unit 201. The segmented first coaxial cable 104 and the second coaxial cable 203 can reduce the difficulty of processing and producing the entire antenna.

[0031] The high-gain dual-fed dual-frequency omnidirectional array antenna of this embodiment does not require a duplexer to achieve dual-frequency operation, which reduces the loss of the antenna. The current direction in the vertical direction remains consistent, and the antenna energy produces a superposition effect, thereby obtaining an omnidirectional high-gain field effect.

Claims

1. A high-gain dual-feed dual-frequency omnidirectional array antenna, characterized in that: It includes a first antenna unit arranged on the front side of the substrate and a second antenna unit arranged on the back side of the substrate, the first antenna unit includes a plurality of dipole units connected by a first coaxial cable series feed, the second antenna unit includes a plurality of dipole units connected by a second coaxial cable series feed, and there is at least one pair of dipole units in the first antenna unit and the second antenna unit whose center positions overlap correspondingly on the front side and the back side of the substrate.

2. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The plurality of dipole units of the first antenna unit are fed in phase with the center frequency.

3. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The plurality of dipole units of the second antenna unit are fed in phase with the center frequency.

4. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The first antenna unit includes a first dipole unit, a second dipole unit and a third dipole unit which are arranged in sequence in a series-feed connection order; the second antenna unit includes a fourth dipole unit and a fifth dipole unit which are arranged in sequence in a series-feed connection order; and the center positions of the second dipole unit and the fifth dipole unit overlap correspondingly on the front and back sides of the substrate.

5. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 4, characterized in that: The first coaxial cable includes a first cable segment and a second cable segment, the first dipole unit is provided with a first electrical connection point and two first dipoles, the shielding wires of the first cable segment and the second cable segment are respectively connected to a first dipole of the first dipole unit, and the core wires of the first cable segment and the second cable segment are commonly connected to the first electrical connection point.

6. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 5, characterized in that: The second dipole unit includes two second dipoles, and the shielding line of the second cable segment is divided into a first part and a second part, and the first part and the second part are respectively connected to a second dipole of the second dipole unit.

7. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 4, characterized in that: The second coaxial cable includes a third cable segment and a fourth cable segment, the fourth dipole unit is provided with a second electrical connection point and two fourth dipoles, the shielding wires of the third cable segment and the fourth cable segment are respectively connected to a fourth dipole of the fourth dipole unit, and the core wires of the first cable segment and the second cable segment are commonly connected to the second electrical connection point.

8. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The first coaxial cable and the second coaxial cable are located opposite to each other on the front and back sides of the substrate.

9. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The first antenna unit operates in a 5 GHz frequency band, and the second antenna unit operates in a 2.4 GHz frequency band.

10. The high-gain dual-feed dual-frequency omnidirectional array antenna according to claim 1, characterized in that: The substrate is a PCB substrate.

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