Miniaturized indoor log-periodic antenna

Abstract

The invention discloses a miniaturized indoor log-periodic antenna, and relates to the technical field of log-periodic antennae, the miniaturized indoor log-periodic antenna comprises a first periodic antenna, a second periodic antenna and an oscillator arm group, the oscillator arm group comprises a first pair of oscillator arms, a second pair of oscillator arms, a third pair of oscillator arms and a fourth pair of oscillator arms, one of each pair of oscillator arms in the first pair of oscillator arms, the second pair of oscillator arms, the third pair of oscillator arms and the fourth pair of oscillator arms is connected with the first periodic antenna, the other one is connected with the second periodic antenna, and each oscillator arm is correspondingly connected with a loading piece. Under the index requirements of the same gain, the same working frequency band and the like, the transverse size and the longitudinal size can be reduced, the actual installation of the antenna is facilitated, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of log-periodic antennas, and particularly to a miniaturized indoor log-periodic antenna. Background Art

[0002] A log-periodic antenna is a multi-element directional non-frequency-variable antenna. The so-called non-frequency-variable means that within a relatively wide operating frequency band, the radiation characteristics, impedance characteristics, and other self-properties do not change with the change of frequency, and the overall structure does not change, and the shape and size only change in proportion.

[0003] Log-periodic antennas have the advantages of wide operating frequency band, simple structure, and easy design, and have a large application space in indoor antennas. However, the current log-periodic antennas have relatively large sizes, and the large volume occupies more space in actual installation and has a higher cost. Therefore, there is an urgent need to design a miniaturized indoor log-periodic antenna to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a miniaturized indoor log-periodic antenna to solve the defects that the current log-periodic antennas have relatively large sizes, the large volume occupies more space in actual installation, and the cost is higher as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A miniaturized indoor log-periodic antenna, including a first periodic antenna, a second periodic antenna, and a set of dipole arms. The set of dipole arms includes a first pair of dipole arms, a second pair of dipole arms, a third pair of dipole arms, and a fourth pair of dipole arms. One of each pair of dipole arms in the first pair of dipole arms, the second pair of dipole arms, the third pair of dipole arms, and the fourth pair of dipole arms is connected to the first periodic antenna, and the other is connected to the second periodic antenna, and a loading element is correspondingly connected to each dipole arm.

[0006] Preferably, when the operating frequency band is 880 - 960 MHz or / and 1710 - 2675 MHz, the lengths of the first pair of dipole arms plus the loading element, the second pair of dipole arms plus the loading element, the third pair of dipole arms plus the loading element, and the fourth pair of dipole arms plus the loading element are respectively less than the lengths of the first pair of dipole arms plus an additional length, the second pair of dipole arms plus an additional length, the third pair of dipole arms plus an additional length, and the fourth pair of dipole arms plus an additional length.

[0007] Preferably, the dipole arm group further includes a rear arm group. The first pair of dipole arms, the second pair of dipole arms, the third pair of dipole arms, and the fourth pair of dipole arms are parallel to each set of dipole arms in the rear arm group and have a length of L. The distance between each pair of dipole arms and the previous pair of dipole arms is d. Let the interval factor be σ, then d = 2L·σ.

[0008] Preferably, the dipole arm group has 12 to 24 pairs, and a slot is correspondingly opened on each dipole arm with a length of 5 mm to 15 mm. The slot is triangular.

[0009] Preferably, the first periodic antenna is connected with a first connecting plate, and the second periodic antenna is connected with a second connecting plate. A reflector is arranged on the side of the first connecting plate away from the first periodic antenna. Openings are formed on both the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate are installed on the reflector through the openings.

[0010] Preferably, a hole is penetrated through the reflector, and an antenna cover is arranged outside the first periodic antenna. The first periodic antenna and the second periodic antenna are fixed to the wall through the hole.

[0011] Preferably, a through hole is penetrated through the reflector, and the first connecting plate and the second connecting plate form a through slot.

[0012] Preferably, a feeding member is connected to one end of the first periodic antenna away from the first connecting plate, and the feeding member is connected to a coaxial feeder.

[0013] Preferably, a set of support blocks are correspondingly connected to both the first periodic antenna and the second periodic antenna.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Under the requirements of the same gain and working frequency band and other indicators, the horizontal size and vertical size of the miniaturized indoor log-periodic antenna will be reduced, which is beneficial to the actual installation of the antenna and reduces the production cost.

[0015] First, by setting a suitable distance between the first periodic antenna and the second periodic antenna, while reducing the overall volume, it does not affect the selection of the maximum gain and frequency band, and the first periodic antenna and the second periodic antenna are fixed to the reflector through the first connecting plate and the second connecting plate, and the reflector is fixed to the antenna cover to fix the positions of the first periodic antenna and the second periodic antenna to prevent them from shaking and collapsing inside the antenna cover.

[0016] Second, by connecting loading members to the first pair of dipole arms, the second pair of dipole arms, the third pair of dipole arms, and the fourth pair of dipole arms, the occupied volume on both sides of the periodic antenna can be further reduced without affecting the frequency band and gain, and the rigidity of each dipole arm is improved and the quality is improved through the triangular slots. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view structural schematic diagram of the present invention;

[0018] Figure 2 for the present invention Figure 1 is a structural schematic diagram of part A in the present invention;

[0019] Figure 3 for the present invention Figure 1 is a structural schematic diagram of the reflector in the present invention;

[0020] Figure 4 for the present invention Figure 1 is a separated view of the first - cycle antenna and the second - cycle antenna in the present invention;

[0021] Figure 5 is a structural schematic diagram of the antenna cover of the present invention.

[0022] In the figure: 1, the first - cycle antenna; 2, the second - cycle antenna; 3, the oscillator arm group; 301, the first pair of oscillator arms; 302, the second pair of oscillator arms; 303, the third pair of oscillator arms; 304, the fourth pair of oscillator arms; 305, the rear - arm group; 4, the loading member; 5, the slot; 6, the first connecting plate; 7, the second connecting plate; 8, the reflector; 9, the opening; 10, the hole; 11, the through - hole; 12, the feeding member; 13, the support block; 14, the antenna cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1-5 , an embodiment provided by the present invention: a miniaturized indoor log - periodic antenna, including a first - cycle antenna 1, a second - cycle antenna 2, and an oscillator arm group 3. The oscillator arm group 3 includes a first pair of oscillator arms 301, a second pair of oscillator arms 302, a third pair of oscillator arms 303, and a fourth pair of oscillator arms 304. One of each pair of oscillator arms in the first pair of oscillator arms 301, the second pair of oscillator arms 302, the third pair of oscillator arms 303, and the fourth pair of oscillator arms 304 is connected to the first - cycle antenna 1, and the other is connected to the second - cycle antenna 2, and a loading member 4 is correspondingly connected to each oscillator arm;

[0025] When the operating frequency band is 880 - 960 MHz or / and 1710 - 2675 MHz, the lengths of the first pair of dipole arms 301 plus the loading member 4, the second pair of dipole arms 302 plus the loading member 4, the third pair of dipole arms 303 plus the loading member 4, and the fourth pair of dipole arms 304 plus the loading member 4 are respectively less than the lengths of the first pair of dipole arms 301 plus an additional length, the second pair of dipole arms 302 plus an additional length, the third pair of dipole arms 303 plus an additional length, and the fourth pair of dipole arms 304 plus an additional length.

[0026] It should be noted that the additional length mentioned above is not drawn in the figure, and the loading member 4 is for reducing the antenna size while not affecting the antenna performance. When the antenna operates in the 880 - 960 MHz frequency band, without the loading member 4, the maximum gain will be lower than that with the loading member 4 by 1 dB, and the front-to-back ratio will also be very poor. While in the 1710 - 2675 MHz frequency band, without the loading member 4, the gain will be 0.1 - 0.3 dB lower at some frequency points.

[0027] Furthermore, the dipole arm group 3 further includes a rear arm group 305. The first pair of dipole arms 301, the second pair of dipole arms 302, the third pair of dipole arms 303, and the fourth pair of dipole arms 304 are parallel to each group of dipole arms in the rear arm group 305 and have a length of L. The distance between each pair of dipole arms and the previous pair of dipole arms is d. Let the spacing factor Then

[0028] Furthermore, the dipole arm group 3 has 12 to 24 pairs, and a slot 5 is correspondingly opened on each dipole arm with a length of 5 mm to 15 mm. The slot 5 is triangular, and the triangular slot 5 is for increasing the rigidity of each pair of dipole arms.

[0029] Furthermore, the first periodic antenna 1 is connected with a first connecting plate 6, the second periodic antenna 2 is connected with a second connecting plate 7. On the side of the first connecting plate 6 away from the first periodic antenna 1, a reflector 8 is provided. Openings 9 are provided on both the first connecting plate 6 and the second connecting plate 7. The first connecting plate 6 and the second connecting plate 7 are installed on the reflector 8 through the openings 9.

[0030] Furthermore, a hole 10 penetrates through the reflector 8. An antenna cover 14 is provided outside the first periodic antenna 1. The first periodic antenna 1 and the second periodic antenna 2 are fixed to the wall through the hole 10.

[0031] Furthermore, a through hole 11 penetrates through the reflector 8. The first connecting plate 6 and the second connecting plate 7 form a through slot. The through hole 11 and the through slot facilitate the coaxial feeder to pass through.

[0032] Furthermore, one end of the first periodic antenna 1 away from the first connecting plate 6 is connected with a feeding member 12, and the feeding member 12 is connected with a coaxial feeder.

[0033] Furthermore, a group of supporting blocks 13 are correspondingly connected to the first periodic antenna 1 and the second periodic antenna 2 .

[0034] In some embodiments, after determining the distance between the first periodic antenna 1 and the second periodic antenna 2, a suitable distance proportional factor τ is set. By selecting a smaller distance proportional factor τ, the overall size of the antenna can be reduced, and the longest vibrator length L can be determined by the minimum operating frequency. 1 , according to the relationship between the proportional factor τ, the spacing factor σ and the gain, the values ​​of the proportional factor and the spacing factor are determined. The dipole arm can make each pair of dipole arms equivalent to the current antinode on a dipole move upward through the loading component 4, reduce the input impedance of the dipole, and then increase the effective length of the dipole. In this way, the corresponding length L of the dipole arm is reduced, achieving the purpose of size reduction;

[0035] According to the above formula Get n =2L n σ, where the spacing factor σ has been determined to be a constant. When the length of the vibrator arm decreases, the longitudinal dimension will also decrease. Therefore, when the length of the vibrator arm decreases, the lateral dimension will decrease, and the reduction in the longitudinal dimension is not as obvious as the lateral dimension.

[0036] In some embodiments, rivets are passed through openings 9 to fix the first connecting plate 6 and the second connecting plate 7 to the reflector 8, and mounting nails or other devices that can lock at both ends are used to fix the reflector 8 to the inner wall of the antenna cover 14 through openings 10. Due to the through holes 11, two sets of support blocks 13 are required to support the first periodic antenna 1 and the second periodic antenna 2 to prevent shaking and collapse.

[0037] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A miniaturized indoor log-periodic antenna, Characterized in that, Comprising: A first periodic antenna (1), a second periodic antenna (2) and an oscillator arm group (3), the oscillator arm group (3) includes a first pair of oscillator arms (301), a second pair of oscillator arms (302), a third pair of oscillator arms (303) and a fourth pair of oscillator arms (304). One of each pair of oscillator arms in the first pair of oscillator arms (301), the second pair of oscillator arms (302), the third pair of oscillator arms (303) and the fourth pair of oscillator arms (304) is connected to the first periodic antenna (1), and the other is connected to the second periodic antenna (2), and a loading member (4) is correspondingly connected to each oscillator arm; When the operating frequency band is 880 - 960 MHz or / and 1710 - 2675 MHz, the lengths of the first pair of oscillator arms (301) plus the loading member (4), the second pair of oscillator arms (302) plus the loading member (4), the third pair of oscillator arms (303) plus the loading member (4) and the fourth pair of oscillator arms (304) plus the loading member (4) are respectively less than the lengths of the first pair of oscillator arms (301) plus other lengths, the second pair of oscillator arms (302) plus other lengths, the third pair of oscillator arms (303) plus other lengths and the fourth pair of oscillator arms (304) plus other lengths.

2. The miniaturized indoor log-periodic antenna according to claim 1, Characterized in that, The oscillator arm group (3) further includes a rear arm group (305). The first pair of oscillator arms (301), the second pair of oscillator arms (302), the third pair of oscillator arms (303), and the fourth pair of oscillator arms (304) are parallel to each other and have a length of L with each group of oscillator arms in the rear arm group (305). The distance between each pair of oscillator arms and the previous pair of oscillator arms is d. Let the spacing factor Then 3. The miniaturized indoor log-periodic antenna according to claim 1, Characterized in that, The oscillator arm group (3) is 12 - 24 pairs, and a slot (5) is correspondingly opened on each oscillator arm with a length of 5 mm - 15 mm, and the slot (5) is triangular.

4. The miniaturized indoor log-periodic antenna according to claim 1, Characterized in that, The first periodic antenna (1) is connected with a first connecting plate (6), the second periodic antenna (2) is connected with a second connecting plate (7), a reflector (8) is arranged on one side of the first connecting plate (6) away from the first periodic antenna (1), through holes (9) are opened on both the first connecting plate (6) and the second connecting plate (7), and the first connecting plate (6) and the second connecting plate (7) are installed on the reflector (8) through the through holes (9).

5. The miniaturized indoor log-periodic antenna according to claim 4, Characterized in that, A hole (10) penetrates through the reflector (8), an antenna cover (14) is arranged outside the first periodic antenna (1), and the first periodic antenna (1) and the second periodic antenna (2) are fixed to the wall through the hole (10).

6. The miniaturized indoor log-periodic antenna according to claim 5, Characterized in that, A through hole (11) penetrates through the reflector (8), and the first connecting plate (6) and the second connecting plate (7) form a through slot.

7. The miniaturized indoor log-periodic antenna according to claim 6, Characterized in that, One end of the first periodic antenna (1) far from the first connecting plate (6) is connected with a feeding element (12), and the feeding element (12) is connected with a coaxial feeder.

8. The miniaturized indoor log-periodic antenna according to claim 1, characterized in that a set of support blocks (13) are correspondingly connected to both the first periodic antenna (1) and the second periodic antenna (2).

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