Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring

Abstract

The utility model discloses a Beidou omnidirectional circularly polarized reconfigurable antenna device for monitoring the settlement and swing of a wind turbine, characterized in that: the device comprises a parallel circular cavity (6), three double arc arms (3) are distributed around the parallel circular cavity (6), and the double arc arms (3) are connected to the top edge of the parallel circular cavity (6); a circular antenna patch (8) is located at the center of the parallel circular cavity (6); the circular patch (8) is respectively connected to the three double arc arms (3) through three groups of PIN diodes 1 (1) and PIN diodes 2 (2); the technical problem that the antenna technology performs poorly when facing strong electromagnetic interference, resulting in interference with Beidou signal reception, thereby affecting the stability and reliability of the monitoring system, etc.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy space-time service system, and in particular relates to a Beidou omnidirectional circular polarization reconfigurable antenna device for monitoring the settlement and swing of wind turbines. Background Art

[0002] The existing Beidou terminal antenna may have insufficient accuracy, which affects the accuracy of monitoring data. Especially in offshore floating photovoltaic / wind power scenarios, the complexity of the offshore environment may further reduce the accuracy of the antenna. In addition, the existing antenna technology performs poorly in the face of strong electromagnetic interference, resulting in interference with Beidou signal reception, which in turn affects the stability and reliability of the monitoring system. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring, so as to solve the technical problems that the antenna technology performs poorly when facing strong electromagnetic interference, resulting in interference with Beidou signal reception, thereby affecting the stability and reliability of the monitoring system.

[0004] The technical solution of the utility model is:

[0005] A Beidou omnidirectional circularly polarized reconfigurable antenna device for monitoring wind turbine settlement and swing, the device comprises a parallel circular cavity, three double arc arms are distributed around the parallel circular cavity, the double arc arms are connected to the top edge of the parallel circular cavity; a circular antenna patch is located at the center of the parallel circular cavity; the circular patch is respectively connected to the three double arc arms through three groups of PIN diodes 1 and PIN diodes 2.

[0006] A chip inductor is connected between each double arc-shaped arm and the circular antenna patch.

[0007] The forward voltage drop of PIN diode 1 flows into the circular patch, and the forward voltage drop of PIN diode 2 flows out of the circular patch.

[0008] The devices are all mounted on a substrate, and the substrate is made of F4B material with a relative dielectric constant of 2.55.

[0009] The short-circuit via hole vertically passes through the substrate and is connected to the top and bottom layers of the parallel circular cavity to form a short-circuited parallel plate cavity structure.

[0010] The PIN diode 1 and the PIN diode 2 are model SMP1345-079.

[0011] The chip inductor is a 33nh chip inductor.

[0012] Beneficial effects of the utility model:

[0013] The utility model is a Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring. It is suitable for the Beidou system's omnidirectional circularly polarized reconfigurable antenna. The direction of the electric field vector rotation of the electromagnetic wave during propagation is left or right. The antenna can well meet the frequency band requirements of Beidou navigation BDS-1. It improves the monitoring positioning accuracy, the accuracy of the monitoring data, and the stability and reliability of the monitoring terminal. It also has the advantages of compact structure, small size, easy processing, and good antenna performance.

[0014] It solves technical problems such as the poor performance of antenna technology in the face of strong electromagnetic interference, which causes interference in Beidou signal reception and affects the stability and reliability of the monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the utility model;

[0016] Figure 2 This is a bottom perspective view of the utility model;

[0017] Figure 3 It is a side perspective view of the utility model;

[0018] Figure 4 This is a schematic diagram of an equivalent circuit of the utility model. DETAILED DESCRIPTION

[0019] The figure marks in the drawings of the specification include: PIN diode 1, PIN diode 2, double arc arm 3, short-circuit via 4, positive power supply electrode 5, parallel circular cavity 6, inductor 7, circular antenna patch 8, negative power supply electrode 9, antenna port 10.

[0020] The distance between the short-circuit via and the antenna center is a = 4 mm, and the radius of the top layer of the parallel circular cavity is R 1 =14.5mm, short-circuit via radius R 2 =0.8mm, parallel circular cavity bottom radius R 3 =15.5mm, antenna radius R 4 =24.8mm, PIN diode length W 1 =1.5mm, the thickness of the double arc arm W 1c =1.0mm,W 2c =1.0mm, distance between double arc arm and parallel circular cavity L 1 =2.5mm, double arc arm width L 2 =3.0mm, double arc arm angle θ 1 =110°, angle between double arc arms θ 2 =10°.

[0021] A Beidou omnidirectional circularly polarized reconfigurable antenna device for monitoring wind turbine settlement and swing includes an antenna consisting of a parallel circular cavity, three double arc arms, a short-circuit via, 6 PIN diodes, an inductor, a substrate and an antenna port.

[0022] The parallel circular cavity is the central part of the antenna, formed by connecting the top and bottom layers of the substrate through short-circuit vias.

[0023] Three double arc arms extend from the edge of the parallel circular cavity and are distributed around the parallel circular cavity. Each double arc arm is connected to the top edge of the parallel circular cavity and connected to the circular antenna patch through 6 PIN diodes at its head and end. (Each PIN diode is connected to the circular antenna patch and the double arc arm on the parallel circular cavity through a pad).

[0024] Short-circuit vias: Short-circuit vias pass vertically through the substrate, connecting the corresponding positions of the top and bottom layers of the parallel circular cavity to form a short-circuited parallel plate cavity structure, which helps to form the resonant characteristics of the antenna.

[0025] Substrate: All components of the antenna are mounted on the substrate. The substrate is F4B material with a relative dielectric constant of 2.55.

[0026] The polarization mode of the antenna is switched by controlling the bias state of the PIN diode through a DC control circuit.

[0027] Antenna port: The antenna port is the interface for connecting the antenna to the external RF circuit.

[0028] The circular antenna patch 8 is printed on a parallel circular cavity 6 made of an F4B substrate with a relative dielectric constant of 2.55; the circular patch 8 is connected to three double arc arms 3 through three groups of PIN diodes 1 and PIN diodes 2 respectively; the forward voltage drop of PIN diode 1 flows into the circular patch 8 of the double arc arm, and the forward voltage drop of PIN diode 2 flows out of the circular patch 8.

[0029] The diode model is: SMP1345-079.

[0030] Each double arc arm 3 and the bottom circular antenna patch 8 are connected to a 33nh chip inductor 7 to block the AC signal. The parameters of the PIN diode equivalent circuit are,

[0031] L int =0.6nH,R r =8000Ω, C j =0.15pF,R f =2Ω. Figure 4 shown.

[0032] The antenna unit is analyzed based on the composite left / right transmission line resonant cavity principle. The first-order resonance principle is adopted. The resonant angular frequency is:

[0033]

[0034] In the above formula, L m and L e are the inductances of the left and right transmission lines, C m is the transmission line capacitance.

[0035] Different lengths and positions of the short-circuit vias, as well as the radius of the parallel circular cavity and the size of the double arc arms can change L m , C m and L e (The length and position of the short-circuit via, the radius of the circular cavity and the size of the double-arc arm are determined during the design phase.) The design of the double-arc arm structure increases the scalability of Lm and ensures that the resonant frequency meets the circular polarization axis ratio requirement at 2492MHz.

[0036] The above design creates an inherent 90° phase difference between vertical and horizontal radiation. Good axial characteristics and impedance matching are achieved within the target frequency band. The antenna ensures omnidirectional radiation, has the advantages of compact structure, small size, easy processing, and good antenna performance, and can be used as a receiving terminal antenna.

Claims

1. A Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring, characterized in that: The device comprises a parallel circular cavity (6), three double arc-shaped arms (3) distributed around the parallel circular cavity (6), and the double arc-shaped arms (3) are connected to the top edge of the parallel circular cavity (6); a circular antenna patch (8) is located at the center of the parallel circular cavity (6); and the circular antenna patch (8) is respectively connected to the three double arc-shaped arms (3) through three groups of PIN diodes 1 (1) and PIN diodes 2 (2).

2. According to claim 1, a Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring is characterized in that: A chip inductor (7) is connected between each double arc-shaped arm (3) and the circular antenna patch (8).

3. The Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring according to claim 1, characterized in that: The forward voltage drop of the PIN diode 1 (1) flows into the circular antenna patch (8), and the forward voltage drop of the PIN diode 2 (2) flows out of the circular antenna patch (8).

4. The Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring according to claim 1, characterized in that: The devices are all mounted on a substrate, and the substrate is made of F4B material with a relative dielectric constant of 2.

55.

5. The Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring according to claim 4, characterized in that: The short-circuit via hole (4) vertically passes through the substrate and is connected to the top layer and the bottom layer of the parallel circular cavity, thereby forming a short-circuit parallel plate cavity structure.

6. The Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring according to claim 1, characterized in that: The PIN diode 1 (1) and PIN diode 2 (2) are model SMP1345-079.

7. The Beidou omnidirectional circularly polarized reconfigurable antenna device for wind turbine settlement and swing monitoring according to claim 2, characterized in that: The chip inductor (7) is a 33nh chip inductor.

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