A Broadband Circularly Polarized Microstrip Antenna Array

Abstract

The invention discloses a broadband circularly polarized microstrip antenna array. The specific structure includes: a dielectric substrate, a circularly polarized antenna, a feeding network and a metal floor; the circularly polarized antenna is fixedly connected to the upper surface of the dielectric substrate, and the The metal floor is fixedly connected to the lower surface of the dielectric substrate; the circularly polarized antenna includes four side-coupled circularly polarized antenna units of the same structure; the side-coupled circularly polarized antenna unit includes a square cut-angle radiation patch , microstrip coupling line, microstrip stub line I, microstrip stub line II and microstrip connection line I; due to the use of side-coupled antenna elements, the matching bandwidth of the antenna is improved; by adjusting both sides of the side coupling line The loaded vertical stub line widens the 3dB axial ratio bandwidth of the circularly polarized antenna; in addition, the feed network with circularly polarized wave radiation function is used to reduce the antenna size and increase the antenna gain, and it has a compact structure and is easy to manufacture Features such as low cost.

Description

technical field

[0001] The invention relates to the technical field of antennas, in particular to a broadband circularly polarized microstrip antenna array. Background technique

[0002] Circularly polarized antennas can suppress the interference of external waves, reduce multipath propagation effects, and eliminate polarization distortion, so they are widely used in wireless communication systems such as radar, satellite, WIFI, RFID, and Bluetooth. With the rapid development of wireless communication technology, circularly polarized antennas are developing in the direction of broadband, low cost, and miniaturization.

[0003] Microstrip antennas are widely used in the field of wireless communication due to their advantages of easy processing and light weight. There are many technical measures for microstrip antennas to achieve circular polarization, which can be roughly divided into single-point feeding and dual-point feeding, such as cutting angle perturbation, slotting o...

Examples

Embodiment Construction

[0025] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0026] like figure 1 A broadband circularly polarized microstrip antenna array is shown, figure 1 It is a top view of the broadband circularly polarized microstrip antenna array of the present invention. figure 2 It is a side view of the broadband circularly polarized microstrip antenna array of the present invention. like figure 1 and 2 As shown, the antenna array includes a dielectric substrate 1 , a circularly polarized antenna 2 , a feeding network 3 and a metal floor 4 .

[0027] The circularly polarized antenna 2 is printed on the upper surface of the dielectric substrate 1 , and the metal floor 4 is printed on the lower surface of the dielectric substrate 1 .

[0028] The circul...

technical field

[0001] The invention relates to the technical field of antennas, in particular to a broadband circularly polarized microstrip antenna array. Background technique

[0002] Circularly polarized antennas can suppress the interference of external waves, reduce multipath propagation effects, and eliminate polarization distortion, so they are widely used in wireless communication systems such as radar, satellite, WIFI, RFID, and Bluetooth. With the rapid development of wireless communication technology, circularly polarized antennas are developing in the direction of broadband, low cost, and miniaturization.

[0003] Microstrip antennas are widely used in the field of wireless communication due to their advantages of easy processing and light weight. There are many technical measures for microstrip antennas to achieve circular polarization, which can be roughly divided into single-point feeding and dual-point feeding, such as cutting angle perturbation, slotting o...

Examples

Embodiment Construction

[0025] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0026] like figure 1 A broadband circularly polarized microstrip antenna array is shown, figure 1 It is a top view of the broadband circularly polarized microstrip antenna array of the present invention. figure 2 It is a side view of the broadband circularly polarized microstrip antenna array of the present invention. like figure 1 and 2 As shown, the antenna array includes a dielectric substrate 1 , a circularly polarized antenna 2 , a feeding network 3 and a metal floor 4 .

[0027] The circularly polarized antenna 2 is printed on the upper surface of the dielectric substrate 1 , and the metal floor 4 is printed on the lower surface of the dielectric substrate 1 .

[0028] The circul...

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