End-on-fire antenna
An end-fire antenna and antenna unit technology, which is applied in the field of railway communication equipment, can solve the problems of many signal blind spots, small size, and low profile, and achieve the effect of realizing antenna volume and reducing spacing
Active Publication Date: 2022-03-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
[0004] Aiming at the defects of too large volume and many signal blind areas in the prior art, the present invention discloses an end-fire antenna, which not only can supplement the blind area along the vertical tunnel wall, but also has the advantages of small volume, low section And other advantages, to meet the communication requirements in the closed environment of small spaces such as roads and railway tunnels
Method used
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Embodiment approach 1
[0038] refer to Figure 1 to Figure 3 , the present embodiment provides an end-fire antenna, including a substrate 1, the top surface and the bottom surface of the substrate 1 are respectively provided with a first antenna unit 2 and a second antenna unit 3, and the first antenna unit 2 includes a first vibrator 22 and the first reflective ground 21, the second antenna unit 3 includes a second vibrator 32 and a second reflective ground 31, the projection of the first reflective ground 21 in the vertical direction and the projection of the second reflective ground 31 in the vertical direction are completely overlap, thereby realizing the antipodal setting of the first antenna unit 2 and the second antenna unit 3;
[0039]At least two first bumps 211 and at least two first slots 212 are arranged on the first reflective ground 21, the first bumps 211 and the first slots 212 are arranged alternately, and the first The vibrator 22 is provided with at least two second bumps 221 and...
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Abstract
The end-on-fire antenna comprises a substrate, a first antenna unit and a second antenna unit are arranged on the front face and the back face of the substrate respectively, and guiding units matched with the first antenna unit and the second antenna unit are further symmetrically arranged on the front face of the substrate; the first antenna unit comprises a first oscillator and a first reflection ground which are mutually coupled and fed, and the first reflection ground is communicated with an external wire; the second antenna unit comprises a second oscillator and a second reflection ground which are coupled for feeding, and the second reflection ground and the first reflection ground are coupled for feeding; since the first oscillator, the second oscillator, the first reflection ground and the second reflection ground are all in the conductive state, and the electromagnetic waves generated by the reflection ground carry out phase compensation on the electromagnetic waves generated by the corresponding oscillators, compared with a traditional antenna, the antenna does not need to strictly comply with the requirement for the distance between the reflection ground and the oscillators, and the antenna is simple in structure and convenient to use. Therefore, the distance between the oscillator and the reflection ground is reduced, and the size of the antenna is reduced.
Description
technical field [0001] The invention relates to the technical field of railway communication equipment, in particular to an end-fire antenna. Background technique [0002] Yagi antennas have been widely used due to their good directivity, but the traditional Yagi antennas and improved quasi-Yagi antennas are equipped with dipoles, directors and reflectors. Due to the limitation of the working principle of Yagi antennas, in order to ensure that the directors For normal operation, the distance between the vibrator and the reflector is a fixed value (generally 0.25λ), plus the distance between the directors at all levels causes the volume of the Yagi antenna to be too large; [0003] In railway or road tunnels, due to the limited internal space, the above-mentioned antennas cannot be used normally; while the leaky cables commonly used in the prior art mainly transmit energy along the radial direction of the cable, and only radiate within a certain range around the cable during ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01Q1/22H01Q1/36H01Q1/50
CPCH01Q1/50H01Q1/22H01Q1/36Y02D30/70
Inventor 马征张思琦胡昌海罗宇吴彦良
Owner SOUTHWEST JIAOTONG UNIV