Piezoelectric antenna for increasing far-field radiation

Abstract

The utility model designs a piezoelectric antenna capable of increasing far-field radiation. The piezoelectric antenna is of a cuboid structure, external voltage is applied up and down to excite antenna radiation, and the resonant frequency of the antenna is 54.67 kHz; a square-shaped hollow cuboid is arranged around the piezoelectric antenna to improve a radiation pattern, and the piezoelectric antenna and the square-shaped hollow cuboid are fixedly connected through a rectangular bottom. The designed antenna works in a 54.67 kHz low-frequency band, the two-dimensional far field of a radiation pattern is 8-shaped, the maximum far field mode is 1.65 * 10 < 5 > V / m, and the minimum far field mode is 4.32 * 10 < 3 > V / m; the maximum value of the far-field mode of a radiation pattern can reach 1.16 * 10 < 7 > V / m and the minimum value of the far-field mode can reach 1.94 * 10 < 3 > V / m through the square hollow cuboid; the far-field mode achieves approximately 10-fold enhancement. And the far-field radiation of the piezoelectric low-frequency antenna is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of antenna technology for wireless communication, and specifically relates to a piezoelectric antenna that increases far-field radiation. Background Technology

[0002] A piezoelectric antenna is a device that generates electromagnetic waves using the piezoelectric effect. Its technological background primarily involves utilizing the mechanical vibration of piezoelectric materials to achieve electromagnetic radiation. Piezoelectric materials such as quartz and PVDF undergo mechanical deformation when excited by an external electric field, driving the movement of bound charges on their surface and forming a dipole current, thereby generating electromagnetic waves. This gives piezoelectric antennas significant advantages in low-frequency wireless communication, especially in terms of size and power consumption. Enhancing the far-field radiation of piezoelectric antennas can greatly improve their performance, and piezoelectric antennas have enormous potential in portable, miniaturized, and high-performance wireless communication devices in the future. Summary of the Invention

[0003] This invention designs a piezoelectric antenna to enhance far-field radiation, enabling the far-field mode of the piezoelectric antenna radiation pattern to reach a maximum of 1.16 × 10⁻⁶. 7 V / m, the minimum value can reach 1.94×10 3 V / m gives the piezoelectric antenna better radiation characteristics.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The piezoelectric antenna is composed of a cuboid. A U-shaped hollowed-out cuboid surrounds the piezoelectric antenna, and the antenna and the U-shaped hollowed-out cuboid are fixedly connected by a rectangular base. The materials of the U-shaped hollowed-out cuboid and the rectangular base are Aluminium. The piezoelectric antenna is excited to radiate by applying a bias voltage of 100V to its upper surface, and a sphere simulates the external air domain of the piezoelectric antenna.

[0005] The advantages of this utility model are: the piezoelectric antenna resonant frequency is 54.67kHz; a "U"-shaped hollowed-out cuboid around the piezoelectric antenna improves the radiation pattern; the designed antenna operates in the low-frequency band of 54.67kHz, and the radiation direction... Figure 2 The far-field shape is "8", and its maximum far-field modulus is 1.65 × 10⁻⁶. 5 V / m, minimum is 4.32×10 3 V / m; By using a rectangular prism with a "U"-shaped cutout to increase the far-field mode of the radiation pattern, the maximum value can reach 1.16 × 10⁻⁶. 7 V / m, the minimum value can reach 1.94×10 3 V / m; enhances the far-field radiation of the piezoelectric antenna.

[0006] The cuboid piezoelectric antenna mentioned above refers to: one located at the coordinate center with a length L1 = 2.2 cm, a width W1 = 2.2 cm, and a height H1 = 9.6 cm.

[0007] The "mouth"-shaped hollow cuboid structure mentioned above refers to: a "mouth"-shaped hollow cuboid formed by subtracting a small cuboid with a length L3 = 4 cm, a width W3 = 4 cm, and a height H3 = 9.6 cm from a large cuboid with a length L2 = 5 cm, a width W2 = 5 cm, and a height H2 = 9.6 cm, both located at the coordinate center.

[0008] The rectangular bottom mentioned above refers to: one located below the piezoelectric antenna and the "mouth"-shaped hollow cuboid with a length L4 = 10 cm, a width W4 = 10 cm, and a height H4 = 0.2 cm. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of a piezoelectric low-frequency antenna of the present utility model.

[0010] Figure 2 It is a front view of a piezoelectric low-frequency antenna of the present utility model.

[0011] Figure 3 It is a top view of a piezoelectric low-frequency antenna of the present utility model.

[0012] Figure 4 It is a two-dimensional radiation pattern of a piezoelectric low-frequency antenna of the present utility model without the "mouth"-shaped hollow cuboid structure at 54.67 kHz.

[0013] Figure 5 It is a three-dimensional radiation pattern of a piezoelectric low-frequency antenna of the present utility model without the "mouth"-shaped hollow cuboid structure at 54.67 kHz.

[0014] Figure 6 It is a two-dimensional radiation pattern of a piezoelectric low-frequency antenna of the present utility model at 54.67 kHz.

[0015] Figure 7 It is a three-dimensional radiation pattern of a piezoelectric low-frequency antenna of the present utility model at 54.67 kHz. Detailed Embodiment

[0016] The present utility model will be further described in detail below with reference to the drawings in the specification.

[0017] As Figure 1 shown, the low-frequency piezoelectric antenna consists of three parts: a cuboid piezoelectric antenna (101), a "mouth"-shaped hollow cuboid structure formed by subtracting a large cuboid (201) from a small cuboid (202), and a rectangular bottom (301).

[0018] As Figure 2 As shown, the structure of the cuboid piezoelectric antenna (101) is that it is located at the coordinate center with a height of H1 = 9.6 cm, and the material is Lead Zirconate Titanate (PZT-5H); the large cuboid (201) located at the coordinate center has a height of H2 = 9.6 cm, and the material is Aluminium, and the small cuboid (202) located at the center has a height of H3 = 9.6 cm, and the material is Aluminium. The "mouth"-shaped hollow cuboid is formed by subtracting them, and the bottom is a rectangular bottom (301) with a material of Aluminium and a height of H4 = 0.2 cm.

[0019] As Figure 3 shown, the structure of the cuboid piezoelectric antenna (101) is that there is one at the coordinate center with a length of L1 = 2.2 cm and a width of W1 = 2.2 cm; the large cuboid (201) located at the coordinate center has a length of L = 5 cm and a width of W2 = 5 cm, and the small cuboid (202) located at the center has a length of L3 = 4 cm and a width of W3 = 4 cm. The "mouth"-shaped hollow cuboid is formed by subtracting them, and the bottom is a rectangular bottom (301) with a material of Aluminium, a length of L4 = 10 cm, and a width of W4 = 10 cm; the distance b between the cuboid piezoelectric antenna (101) and the "mouth"-shaped hollow cuboid structure formed by subtracting the large cuboid (201) and the small cuboid (202) is 0.9 cm.

[0020] As Figure 4 shown, for a piezoelectric low-frequency antenna of the present utility model without the "mouth"-shaped hollow cuboid structure, the two-dimensional radiation pattern at 54.67 kHz. The radiation pattern of this antenna is an "8" shape, θ = 90 deg, Ф = 45 deg.

[0021] As Figure 5 shown, for a piezoelectric low-frequency antenna of the present utility model without the "mouth"-shaped hollow cuboid structure, the two-dimensional radiation pattern at 54.67 kHz. The three-dimensional radiation pattern of this antenna shows an omnidirectional radiation pattern, and its far-field mode is maximum 1.65×10 5 V / m and minimum 4.32×10 3 V / m.

[0022] As Figure 6 shown, for a piezoelectric low-frequency antenna of the present utility model, the two-dimensional radiation pattern at 54.67 kHz. The radiation pattern of this antenna is an "8" shape, θ = 90 deg, Ф = 32 deg.

[0023] As Figure 7As shown, this utility model combines a piezoelectric low-frequency antenna with a "U"-shaped hollowed-out cuboid structure in a two-dimensional radiation pattern at 54.67 kHz. The antenna's three-dimensional radiation pattern exhibits omnidirectional radiation, with a maximum far-field mode of 1.16 × 10⁻⁶. 7 V / m, the minimum value can reach 1.94×10 3 V / m.

[0024] The above description is merely a specific embodiment of this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. This utility model may also have other various embodiments. Without departing from the spirit and essence of this invention, those skilled in the art can make various corresponding changes and modifications according to this invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims of this invention.

Claims

1. A piezoelectric antenna for increasing far field radiation, characterized by, The antenna comprises: a cuboid piezoelectric antenna (101); a "mouth" type hollow cuboid formed by subtracting a small cuboid (202) from a large cuboid (201); a rectangular base (301).

2. A piezoelectric antenna for increasing far field radiation according to claim 1, wherein, The cuboid piezoelectric antenna (101) has a length L1=2.2 cm, a width W1=2.2 cm, a height H1=9.6 cm, and is made of Lead Zirconate Titanate (PZT-5H).

3. The piezoelectric antenna of claim 1, wherein, The "mouth" type hollow cuboid is formed by subtracting a small cuboid (202) from a large cuboid (201) located at the center of coordinates, wherein the large cuboid (201) has a length L2=5 cm, a width W2=5 cm, a height H2=9.6 cm, and is made of Aluminium; the small cuboid (202) has a length L3=4 cm, a width W3=4 cm, a height H3=9.6 cm, and is made of Aluminium.

4. The piezoelectric antenna of claim 1, wherein, The rectangular base (301) is located below the cuboid piezoelectric antenna and the "mouth" type hollow cuboid, has a length L4=10 cm, a width W4=10 cm, and a height H4=0.2 cm.

5. The piezoelectric antenna of claim 1, wherein, The cuboid piezoelectric antenna (101) is excited by applying external voltage to stimulate antenna radiation, and the antenna resonance frequency is 54.67 kHz; the "mouth" type hollow cuboid is formed by subtracting a small cuboid (202) at the center from a large cuboid (201) at the center, and the cuboid piezoelectric antenna and the "mouth" type hollow cuboid are fixedly connected through the rectangular bottom (301); the designed antenna works in the 54.67 kHz frequency band, and the two-dimensional far field of the radiation pattern is "8" shape, the maximum of which is 1.65×10 5 V / m, and the minimum is 4.32×10 3 V / m; by a "mouth" type hollow cuboid, the maximum of the far field of the radiation pattern can reach 1.16×10 7 V / m, and the minimum can reach 1.94×10 3 V / m.

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