Small broadband circular PCB television antenna

Abstract

The invention discloses a small broadband circular PCB (printed circuit board) television antenna, which comprises a substrate, and a first signal feed-in part, a first radiation unit, a second radiation unit, a third radiation unit, a fourth radiation unit and a second signal feed-in part which are arranged on the substrate and are connected in sequence, the first signal feed-in part, the first radiation unit and the second radiation unit are symmetrically arranged with the third radiation unit, the fourth radiation unit and the second signal feed-in part; the first radiation unit and the fourth radiation unit are of a convex structure and are both used for receiving signals of a UHF frequency band, and the second radiation unit and the third radiation unit are of a concave structure and are both used for adjusting the impedance of the antenna.

Description

Technical Field

[0001] The present invention relates to the technical field of television antennas, and particularly to a small broadband circular PCB television antenna. Background Art

[0002] In the field of antennas, especially in television antennas, due to the high manufacturing difficulty of small antennas, the receiving range of the bandwidth of many existing antennas is small, and the manufacturing cost is high. Among them, in the traditional antenna implementation scheme, the double-loop oscillator mode is adopted. However, due to size limitations, the circumference of this loop oscillator is only (resonant) λ / 2 wavelength, resulting in the defect of narrow bandwidth (see the attached Figure 2 shown, the receiving bandwidth is about 570 - 713 MHz); Therefore, based on the above technical problems, the present application specifically proposes a small broadband circular PCB television antenna that saves costs, increases the broadband receiving range, and has high gain. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a small broadband circular PCB television antenna that saves costs, increases the broadband receiving range, and has high gain.

[0004] To achieve the above purpose, a small broadband circular PCB television antenna provided by the present invention includes a substrate and a first signal feeding portion, a first radiation unit, a second radiation unit, a third radiation unit, a fourth radiation unit, and a second signal feeding portion that are sequentially connected on the substrate. The substrate is a circular structure. Among them, the first signal feeding portion, the first radiation unit, and the second radiation unit are symmetrically arranged with the third radiation unit, the fourth radiation unit, and the second signal feeding portion; the first radiation unit and the fourth radiation unit are convex structures and are both used to receive signals in the UHF band, and the second radiation unit and the third radiation unit are concave structures and are both used to adjust the impedance of the antenna.

[0005] Further, the diameter size of the substrate is less than 106 mm.

[0006] Further, the materials of the first signal feeding portion, the first radiation unit, the second radiation unit, the third radiation unit, the fourth radiation unit, and the second signal feeding portion are one of copper, iron, aluminum, and silver.

[0007] Further, the total length of the second radiation unit and the third radiation unit is greater than or equal to the length of the resonant wavelength.

[0008] The present invention adopts the above scheme, and its beneficial effects are as follows: The impedance of the antenna is adjusted by setting the first radiation unit and the fourth radiation unit with convex structures, so that the impedance of the antenna reaches 75 Ω, thereby obtaining a better standing wave ratio and improving the gain of the antenna. In addition, by setting the second radiation unit and the third radiation unit with concave structures and making their total length greater than or equal to the length of the resonant wavelength, the bandwidth of the antenna is broadened, realizing bandwidth reception in the receiving frequency band from 470 MHz to 860 MHz. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of a double-loop dipole in a traditional embodiment.

[0010] Figure 2 It is a schematic diagram of the standing wave ratio and frequency of the double-loop dipole at frequencies from 450 MHz to 900 MHz in the simulation.

[0011] Figure 3 It is a schematic structural diagram of the TV antenna in this embodiment.

[0012] Figure 4 It is a schematic diagram of the standing wave ratio and frequency of the TV antenna in this embodiment at frequencies from 45 MHz to 900 MHz in the physical test.

[0013] Wherein, 1 - substrate, 2 - first signal feeding part, 3 - first radiation unit, 4 - second radiation unit, 5 - third radiation unit, 6 - fourth radiation unit, 7 - second signal feeding part. Detailed Embodiments

[0014] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0015] See the attached Figure 3As shown in the figure, in this embodiment, a small broadband circular PCB TV antenna includes a substrate 1 and a first signal feeding part 2, a first radiation unit 3, a second radiation unit 4, a third radiation unit 5, a fourth radiation unit 6, and a second signal feeding part 7 that are sequentially connected on the substrate 1. The substrate 1 is of a circular structure. Among them, the diameter size of the substrate 1 is less than 106 mm; the first signal feeding part 2, the first radiation unit 3, and the second radiation unit 4 are symmetrically arranged with the third radiation unit 5, the fourth radiation unit 6, and the second signal feeding part 7; the first radiation unit 3 and the fourth radiation unit 6 are of a convex structure and are both used to receive signals in the UHF band, and the second radiation unit 4 and the third radiation unit 5 are of a concave structure and are both used to adjust the impedance of the antenna. Specifically, different from the traditional antenna using a double-loop dipole mode, due to size limitations (see appendix Figure 1 shown), the perimeter of the above-mentioned loop dipole is half the length of the resonant wavelength (λ / 2 wavelength), so there is a defect of a narrow bandwidth (see appendix Figure 2 shown, the receiving bandwidth is about 570 - 713 MHz, and the voltage standing wave ratio (VSWR) is below 2.516); See appendix Figure 3 shown. In the TV antenna of this embodiment, by setting the first radiation unit 3 and the fourth radiation unit 6 to adjust the impedance of the antenna, the impedance of the antenna reaches 75 Ω, so as to obtain a better voltage standing wave ratio and improve the gain of the antenna. In addition, by setting the second radiation unit 4 and the third radiation unit 5, and making the total length of the second radiation unit 4 and the third radiation unit 5 greater than or equal to the length of the resonant wavelength, on the circular structure substrate 1 with a small size, the total length (electrical length of the antenna dipole) of the second radiation unit 4 and the third radiation unit 5 is increased, thereby broadening the bandwidth of the antenna and achieving bandwidth reception in the receiving frequency band of 470 MHz to 860 MHz.

[0016] Furthermore, the materials of the first signal feeding part 2, the first radiation unit 3, the second radiation unit 4, the third radiation unit 5, the fourth radiation unit 6, and the second signal feeding part 7 are one of copper, iron, aluminum, and silver, and the material can be selected according to actual production.

[0017] See appendix Figure 4 shown. In the frequency band (470 MHz to 860 MHz), the voltage standing wave ratio (VSWR) of the TV antenna in this embodiment is below 2.

[0018] In the TV antenna of this embodiment, the absolute gain is 1 dBi to 2 dBi.

[0019] The embodiments described above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, may make more possible changes, refinements or modifications to the technical solution of the present invention by using the technical content disclosed above, which are all equivalent embodiments of the present invention. Therefore, all equivalent changes made according to the idea of the present invention without departing from the content of the technical solution of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A small broadband circular PCB TV antenna, characterized in that: It includes a substrate (1), and a first signal feeding part (2), a first radiation unit (3), a second radiation unit (4), a third radiation unit (5), a fourth radiation unit (6) and a second signal feeding part (7) which are sequentially connected on the substrate (1). The substrate (1) is of a circular structure. Among them, the first signal feeding part (2), the first radiation unit (3) and the second radiation unit (4) are symmetrically arranged with respect to the third radiation unit (5), the fourth radiation unit (6) and the second signal feeding part (7); the first radiation unit (3) and the fourth radiation unit (6) are of convex structures and are both used for receiving signals in the UHF band, and the second radiation unit (4) and the third radiation unit (5) are of concave structures and are both used for adjusting the impedance of the antenna.

2. A small broadband circular PCB TV antenna according to claim 1, characterized in that: The diameter dimension of the substrate (1) is less than 106 mm.

3. A small broadband circular PCB TV antenna according to claim 1, characterized in that: The materials of the first signal feeding part (2), the first radiation unit (3), the second radiation unit (4), the third radiation unit (5), the fourth radiation unit (6) and the second signal feeding part (7) are one of copper, iron, aluminum and silver.

4. A small broadband circular PCB TV antenna according to claim 1, characterized in that: The total length of the second radiation unit (4) and the third radiation unit (5) is greater than or equal to the length of the resonant wavelength.

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