A broadband miniaturized dipole antenna

Abstract

The present invention discloses a broadband miniaturized dipole antenna, belonging to the field of antenna technology. It is composed of a dipole antenna, a metal reflector, a short-circuit structure and a lumped element. The dipole antenna is composed of two bent metal arms. Two L-shaped short-circuit structures are respectively located on the left and right sides of the metal arm structure, and are connected to a transmitting board through a lumped element. By optimizing the structure of each part and the parameters of the lumped element, the matching performance of the antenna can be adjusted, and finally a VHF / UHF antenna with excellent performance is obtained. The present invention realizes miniaturization characteristics by adopting bending and grounding technology, and realizes broadband characteristics by loading lumped element technology.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a broadband miniaturized dipole antenna. Background Art

[0002] On the one hand, in order to meet different communication needs, the carrier platform needs to use multiple antennas working in different frequency bands. However, the use of multiple antennas not only increases complexity and cost, but also affects each other's performance. Therefore, there is an increasing demand for wideband antennas that can cover multiple communication frequency bands at the same time. On the other hand, the size of the antenna is related to the antenna frequency, that is, the lower the frequency, the larger the size, especially for VHF / UHF bands. Due to the limited space on the carrier platform, there is an increasing demand for miniaturized antennas.

[0003] Commonly used VHF / UHF wideband antennas include log-periodic antennas, slot antennas, horn antennas, and dipole antennas. Although log-periodic antennas and slot antennas have wideband, they are large in size. Horn antennas can achieve wideband, but they are heavy. Dipole antennas not only have wideband, but also have the advantages of simple structure and light weight. Therefore, dipole antennas are widely used.

[0004] With the development of technology and the increase of engineering needs, the bandwidth of existing dipole antennas still cannot meet the requirements for limited space carrier platforms. Therefore, it is necessary to study the miniaturization of dipole antennas and expand their bandwidth. Summary of the invention

[0005] In view of this, the present invention provides a broadband miniaturized dipole antenna. The antenna achieves miniaturization characteristics by adopting bending and grounding technology, and achieves broadband characteristics by loading lumped element technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A broadband miniaturized dipole antenna, comprising a metal reflector and a dipole antenna, and also comprising a short-circuit structure with an L-shaped cross section, comprising a sheet-like short branch and a sheet-like long branch connected at the ends and perpendicular to each other; the dipole antenna comprises two mirror-symmetrical dipoles; the dipole comprises a sheet-like vertical branch, an upper horizontal branch and a lower horizontal branch; the upper horizontal branch and the lower horizontal branch are respectively located on the opposite sides of the sheet-like vertical branch, and the upper horizontal branch is connected to the top of the sheet-like vertical branch, and the lower horizontal branch is connected to the bottom of the sheet-like vertical branch; wherein the upper horizontal branch, the lower horizontal branch and the sheet-like short branch are parallel to each other;

[0008] The lower horizontal branches of the two dipoles are connected through a feeding structure; the short-circuit structure is provided on both sides of the left and right sides of the dipole antenna, and the sheet-like short branches of the short-circuit structure are located directly above the corresponding upper horizontal branches of the dipole, and the sheet-like long branches extend downward through lumped elements to be connected to the metal reflector; the sheet-like vertical branches and the sheet-like long branches are parallel to each other.

[0009] Furthermore, the lumped element is a capacitor component or a resistor component.

[0010] Furthermore, the opposite sides of the two lower horizontal branches are arc-shaped sides.

[0011] Furthermore, the upper transverse branch nodes are in close contact with the corresponding sheet-like short branch nodes.

[0012] The beneficial effects of the above technical solution of the present invention are:

[0013] The present invention realizes miniaturization characteristics by adopting bending and grounding technology; the matching performance of the antenna can be adjusted by optimizing the structure of each part and the parameters of the lumped element; and has the advantages of simple structure, wide frequency band and miniaturization. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of an embodiment of the present invention.

[0015] Figure 2 2 is a top view of an embodiment of the present invention.

[0016] Figure 3 is the voltage standing wave ratio of the antenna in the embodiment of the present invention.

[0017] In the figure: 1. Dipole antenna, 2. Inverted L-shaped short-circuit structure, 3. Lumped element, 4. Metal reflector, 5. Feed structure. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] A broadband miniaturized dipole antenna, comprising a metal reflector and a dipole antenna, and also comprising a short-circuit structure with an L-shaped cross section, comprising a sheet-like short branch and a sheet-like long branch connected at the ends and perpendicular to each other; the dipole antenna comprises two mirror-symmetrical dipoles; the dipole comprises a sheet-like vertical branch, an upper horizontal branch and a lower horizontal branch; the upper horizontal branch and the lower horizontal branch are respectively located on the opposite sides of the sheet-like vertical branch, and the upper horizontal branch is connected to the top of the sheet-like vertical branch, and the lower horizontal branch is connected to the bottom of the sheet-like vertical branch; wherein the upper horizontal branch, the lower horizontal branch and the sheet-like short branch are parallel to each other;

[0021] The lower horizontal branches of the two dipoles are connected through a feeding structure; the short-circuit structure is provided on both sides of the left and right sides of the dipole antenna, and the sheet-like short branches of the short-circuit structure are located directly above the corresponding upper horizontal branches of the dipole, and the sheet-like long branches extend downward through lumped elements to be connected to the metal reflector; the sheet-like vertical branches and the sheet-like long branches are parallel to each other.

[0022] Furthermore, the lumped element is a capacitor component or a resistor component.

[0023] Furthermore, the opposite sides of the two lower horizontal branches are arc-shaped sides.

[0024] Furthermore, the upper transverse branch nodes are in close contact with the corresponding sheet-like short branch nodes.

[0025] A broadband miniaturized dipole antenna is composed of a dipole antenna, a metal reflector, a short-circuit structure and a lumped element. The dipole antenna is composed of two bent metal arms. Two L-shaped short-circuit structures are located on the left and right sides of the metal arm structure, respectively, and are connected to the transmitting board through the lumped element. By optimizing the structure of each part and the parameters of the lumped element, the matching performance of the antenna can be adjusted, and finally a VHF / UHF antenna with excellent performance is obtained.

[0026] Reference Figures 1 to 3 This embodiment includes a dipole antenna 1, a metal reflector 4, an inverted L-shaped short-circuit structure 2, a lumped element 3 and a metal reflector. The dipole is located above the metal reflector; the feeding structure 5 feeds in the middle of the dipole antenna; the two inverted L-shaped short-circuit structure parts are parallel to the dipole antenna part; the two ends of the lumped element are respectively connected to the inverted L-shaped short-circuit structure and the metal reflector. The size of the final antenna is 380mm (L) × 360mm (W) × 200mm (H).

[0027] Figure 3 The bandwidth of the antenna is given. It can be seen from the figure that the bandwidth of the antenna is 143%.

[0028] Brief working principle of the present invention:

[0029] The dipole antenna achieves miniaturization by adopting a bent structure and a loaded short-circuit structure; the impedance matching of the dipole antenna is improved by loading lumped elements, thereby achieving a wide-band characteristic.

Claims

1. A broadband miniaturized dipole antenna, comprising a metal reflector and a dipole antenna, characterized in that: It also includes a short-circuit structure with an L-shaped cross section, the short-circuit structure includes a sheet-like short branch and a sheet-like long branch connected at the ends and perpendicular to each other; the dipole antenna includes two mirror-symmetrical dipoles; the dipole includes a sheet-like vertical branch, an upper horizontal branch and a lower horizontal branch; the upper horizontal branch and the lower horizontal branch are respectively located on the opposite sides of the sheet-like vertical branch, and the upper horizontal branch is connected to the top of the sheet-like vertical branch, and the lower horizontal branch is connected to the bottom of the sheet-like vertical branch; wherein the upper horizontal branch, the lower horizontal branch and the sheet-like short branch are parallel to each other; The lower horizontal branches of the two dipoles are connected through a feeding structure; the short-circuit structure is provided on both sides of the left and right sides of the dipole antenna, and the sheet-like short branches of the short-circuit structure are located directly above the corresponding upper horizontal branches of the dipole, and the sheet-like long branches extend downward through the lumped element to be connected to the metal reflector; the sheet-like vertical branches and the sheet-like long branches are parallel to each other; The lumped element is a capacitor or a resistor; The opposite sides of the two lower horizontal branches are arc-shaped sides.

2. A broadband miniaturized dipole antenna according to claim 1, characterized in that: The upper transverse branch nodes are in close contact with the corresponding sheet-like short branch nodes.

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