A horizontally polarized dielectric antenna for indoor distribution

Abstract

The application provides a horizontally polarized dielectric antenna applied to indoor distribution, characterized by comprising, from bottom to top, a dielectric substrate, a metal ground and a dielectric resonator, wherein the lower surface of the dielectric substrate is provided with a feeding structure, the dielectric resonator is annular in shape and has a circular truncated cone-shaped gap in the center, and the radius of the circular truncated cone-shaped gap gradually decreases from the side far away from the dielectric substrate to the side close to the dielectric substrate; the metal ground is symmetrically provided with a pair of arc-shaped metal dipoles above the dielectric substrate, the arc-shaped metal dipole comprises two dipole arms and an open-circuit stub located at the end of the dipole arm far away from the metal ground, the dipole arm is completely covered by the dielectric resonator, and the upper surface of the open-circuit stub is exposed to the outside. The combination of the dielectric resonator and the arc-shaped metal dipole ensures wideband omnidirectional radiation while greatly reducing the planar size of the antenna, and greatly makes up for the defect of large structure size of the existing indoor distribution antenna.

Description

Technical Field

[0001] This invention specifically relates to the field of antenna technology, and more particularly to a horizontally polarized dielectric antenna for indoor distribution. Background Technology

[0002] Indoor communication, as one of the main communication scenarios in daily life, relies heavily on a well-developed indoor distributed antenna system to ensure its communication quality. Indoor distributed antennas can provide signals for indoor communication and have broad application prospects in 2G / 3G / LTE / 5G frequency bands. Generally, every terminal in an indoor environment needs to receive a good signal, which requires indoor distributed antennas to have good omnidirectional radiation characteristics, i.e., low non-circularity in the omnidirectional plane.

[0003] Current vertically polarized indoor distribution antennas often adopt a conical structure, which makes it easy to achieve a wider frequency coverage. In contrast, horizontally polarized indoor distribution antennas usually cannot achieve a working bandwidth comparable to that of a conical antenna, and their planar size is relatively large, with few miniaturized designs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a horizontally polarized dielectric antenna for indoor distribution, thereby achieving antenna miniaturization.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A horizontally polarized dielectric antenna for indoor distribution, characterized in that it comprises: a dielectric substrate, a metal ground, and a dielectric resonator stacked sequentially from bottom to top; a feeding structure is provided on the lower surface of the dielectric substrate; characterized in that: the dielectric resonator is annular in shape and has a frustum-shaped notch in its center, the radius of the frustum-shaped notch gradually decreasing from the side away from the dielectric substrate to the side close to the dielectric substrate; a pair of arc-shaped metal elements are symmetrically arranged on both sides of the metal ground above the dielectric substrate, the arc-shaped metal elements comprising two arms and an open-circuit stub located at the end of the arms away from the metal ground, the arms being completely covered by the dielectric resonator; the open-circuit stub being exposed to the outside.

[0006] The frustum-shaped notch of the ring dielectric resonator in this invention helps to extend the antenna's operating bandwidth and facilitates the embedding of traditional vertically polarized monoconical antennas to meet the application requirements of dual polarization. The arms of the arc-shaped metal oscillator are completely covered by the dielectric resonator, and the dielectric covering the arms effectively reduces the waveguide wavelength of the arms, thus enabling miniaturization. Simultaneously, the two arc-shaped metal oscillators are arranged "face-to-face," forming an equivalent current loop that provides excellent omnidirectional radiation performance. Therefore, the planar size of the horizontally polarized dielectric antenna for indoor distribution can be reduced to 0.35λ. low ×0.35λlow (λ low The wavelength in free space (the lowest operating frequency of the antenna) largely compensates for the large structural panel size defect that is common in existing similar antennas. Attached Figure Description

[0007] Figure 1 This invention relates to a structural perspective view of a horizontally polarized dielectric antenna used in indoor distribution;

[0008] Figure 2 This invention relates to a top view of a horizontally polarized dielectric antenna used in indoor distribution;

[0009] Figure 3 This invention relates to a bottom view of a horizontally polarized dielectric antenna used in indoor distribution;

[0010] Figure 4 This is a perspective view of the dielectric resonator of the antenna of the present invention.

[0011] Figure 5 This is a top view of the metal vibrator and metal ground of the antenna of the present invention.

[0012] Figure 6 The present invention relates to a reflection coefficient and gain curve of a horizontally polarized dielectric antenna for indoor distribution;

[0013] Figure 7 This invention relates to a radiation pattern of a horizontally polarized dielectric antenna for indoor distribution at a frequency of 700MHz;

[0014] Figure 8 This invention relates to a radiation pattern of a horizontally polarized dielectric antenna for indoor distribution at a frequency of 760MHz;

[0015] Figure 9 This invention relates to a radiation pattern of a horizontally polarized dielectric antenna for indoor distribution at a frequency of 880MHz;

[0016] In the attached diagram, 1-dielectric resonator; 2-metal ground; 21-central circular hole of metal ground; 22-rectangular slot; 3-arc-shaped metal oscillator; 31-oscillator arm; 32-open circuit stub; 4-dielectric substrate; 41-central circular hole of dielectric substrate; 5-feed structure; 51-input port; 52-power divider; 53-feed arm. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1This invention relates to a structural perspective view of a horizontally polarized dielectric antenna for indoor distribution, comprising a dielectric resonator 1, a metal ground 2, a pair of arc-shaped metal elements 3, a dielectric substrate 4, and a feeding structure 5. The metal ground 2 and the arc-shaped metal elements 3 are printed on the upper surface of the dielectric substrate 4, and both arc-shaped metal elements 3 are connected to the metal ground 2; the feeding structure 5 is printed on the lower surface of the dielectric substrate 4, and excites the arc-shaped metal elements 3 and the dielectric resonator 1 through coupled feeding.

[0019] like Figure 2 As shown, the dielectric resonator 1 is ring-shaped with a frustum-shaped notch in the middle. The radius of the frustum-shaped notch gradually decreases from the side away from the dielectric substrate 4 to the side close to the dielectric substrate 4. The frustum-shaped notch is beneficial for expanding the operating bandwidth of the antenna and facilitates the embedding of traditional vertically polarized monoconical antennas to meet the application requirements of dual polarization. Each of the arc-shaped metal elements 3 includes two elements arms 31 and two open-circuit stubs 32. The open-circuit stubs are located at the ends of the two arc-shaped elements arms 31 away from the metal ground 2. The two arc-shaped metal elements 3 are arranged in a "face-to-face" manner, forming an equivalent current loop, which can provide good omnidirectional radiation performance. The metal ground 2 has a circular notch 21 in the center, and two rectangular slots 22 are symmetrically distributed at both ends of the metal ground 2 near the arc-shaped metal elements 3.

[0020] like Figure 3 As shown, the dielectric substrate 4 is circular in shape and has a central circular hole 41. The central circular hole 41 is completely overlapped with the central circular hole 21 of the metal ground 2 printed on the upper surface of the dielectric substrate 4. The power supply structure 5 is printed on the lower surface of the dielectric substrate 4 and includes an input port 51, a power divider 52 and two power supply arms 53. The power supply structure 5 excites the arc-shaped metal oscillator 3 and the dielectric resonator 1 through coupling.

[0021] The dielectric resonator 1 partially covers the arc-shaped metal oscillator 3 to achieve miniaturization of the arc-shaped metal oscillator 3. Specifically, the oscillator arm 31 of the arc-shaped metal oscillator 3 is completely covered by the dielectric resonator 1 (the upper surface of the open stub 32 is exposed to the outside world), and is located between the dielectric resonator 1 and the substrate 4. The dielectric covering the oscillator arm 31 can effectively reduce the waveguide wavelength of the oscillator arm 31 to achieve miniaturization of the oscillator arm 31.

[0022] This invention relates to a horizontally polarized dielectric antenna for indoor distribution, which utilizes an arc-shaped metal vibrator 3 and a dielectric resonator 1 to achieve broadband omnidirectional radiation performance. The structural parameters of the dielectric resonator 1 are as follows: Figure 4 As shown, the structural parameters of the associated metal oscillator 3 and metal ground 2 are as follows: Figure 5 As shown, the values ​​of each structural parameter are listed in the table below:

[0023] parameter <![CDATA[d1]]> <![CDATA[d2]]> <![CDATA[d3]]> <![CDATA[d4]]> <![CDATA[h1]]> <![CDATA[h2]]> Value (mm) 144 64 124.3 8 40.5 30.2 parameter <![CDATA[w1]]> <![CDATA[w2]]> <![CDATA[l1]]> <![CDATA[l2]]> <![CDATA[g1]]> <![CDATA[g2]]> Value (mm) 1.5 0.5 21.2 3.6 5 0.7

[0024] This invention relates to a horizontally polarized dielectric antenna for indoor distribution, with an overall planar dimension of only 0.35λ. low ×0.35λ low (λ low Miniaturization offers significant advantages, as it operates at the lowest frequency of the antenna (wavelength in free space).

[0025] Figure 6 The present invention demonstrates the reflection coefficient and gain curve of a horizontally polarized dielectric antenna for indoor distribution, and the results show that the relative bandwidth of the design is 26.4% (690MHz to 900MHz) and the in-band gain is between 0dBi and 3dBi.

[0026] Figure 7 , Figure 8 and Figure 9 The radiation patterns of this design at three different frequency points are shown. The results show that the design has good consistency in radiation patterns within the operating frequency band, with a non-circularity of less than 2 dB in the main polarization pattern in the horizontal plane, a cross-polarization level below -25 dB within the band, and good omnidirectional radiation performance in horizontal polarization.

[0027] The specific implementation schemes described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific implementation schemes of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A horizontally polarized dielectric antenna for indoor distribution, characterized in that, include: The dielectric substrate (4), the metal ground (2), and the dielectric resonator (1) are stacked sequentially from bottom to top. A feeding structure (5) is provided on the lower surface of the dielectric substrate (4). The dielectric resonator (1) is annular in shape and has a frustum-shaped notch in the center. The radius of the frustum-shaped notch gradually decreases from the side away from the dielectric substrate (4) to the side close to the dielectric substrate (4). A pair of arc-shaped metal oscillators (3) are symmetrically arranged on both sides of the metal ground (2) above the dielectric substrate (4). The arc-shaped metal oscillator (3) includes two oscillator arms (31) and an open-circuit stub (32) located at the end of the oscillator arm (31) away from the metal ground (2). The oscillator arm (31) is completely covered by the dielectric resonator (1), and the upper surface of the open-circuit stub (32) is exposed to the outside. The two arc-shaped metal oscillators (3) are arranged in a "face-to-face" manner to form an equivalent current loop.

2. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: The metal ground (2) and the dielectric substrate (4) have overlapping central circular holes (21, 41), and the projections of the central circular holes (21, 41) and the inner hole of the ring dielectric resonator (1) on the dielectric substrate (4) are concentric.

3. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: Two rectangular slots (22) are symmetrically provided at both ends of the metal ground (2) near the arc-shaped metal oscillator (3).

4. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: The power supply structure (5) includes an input port (51), a power divider (52) and two power supply arms (53).

5. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: The metal ground (2) and the arc-shaped metal oscillator (3) are printed on the upper surface of the dielectric substrate (4).

6. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: The power supply structure (5) is printed on the lower surface of the dielectric substrate (4).

7. The horizontally polarized dielectric antenna for indoor distribution according to claim 1, characterized in that: The feeding structure (5) excites the arc-shaped metal oscillator (3) and the dielectric resonator (1) through coupling.

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