Circular polarization spiral antenna with high low elevation gain

Abstract

The invention discloses a circular polarization spiral antenna with high low elevation gain, which comprises a cylindrical spiral antenna radiator, a cross-shaped cross vibrator parasitic unit and a power division phase shift broadband microstrip feed network. The power division phase shift broadband microstrip feed network is positioned below the cylindrical spiral antenna radiator and is connected with the bottom of the cylindrical spiral antenna radiator; and the cross-shaped cross vibrator parasitic unit is positioned above the cylindrical spiral antenna radiator, and comprises two vertical vibrators, wherein when the vibrators are used as antenna directors, the length of the vibrators is less than half wavelength; and when the vibrators are used as antenna reflectors, the length of the vibrators is greater than the half wavelength. The antenna has the advantages of wide frequency band, excellent directional diagram performance, high low elevation gain, compact structure and light weight.

Description

technical field

[0001] The invention relates to a circularly polarized helical antenna, in particular to a circularly polarized helical antenna with high and low elevation angle gain. Background technique

[0002] At present, the application of global positioning and navigation systems is becoming more and more extensive. China's Beidou second-generation system has basically covered the Asia-Pacific region and is expected to cover the whole world in the next ten years. Circularly polarized antennas play a vital role in this system. effect. According to the positioning principle, the low elevation signal close to the ground contributes the most to the positioning accuracy, while the zenith signal is easy to accept but does not contribute much to the positioning accuracy. With the improvement of positioning accuracy requirements, the antenna is generally required to have a higher low-elevation gain, especially for the Beidou system, which has relatively few satellites, and pu...

Examples

Embodiment 1

[0034] Such as figure 1 As shown, a circularly polarized helical antenna with high and low elevation angle gain in the present invention includes a cylindrical helical antenna radiator, a cross-shaped cross-shaped dipole parasitic unit 23 and a power-division phase-shifting broadband microstrip feed network 8, and the cross-shaped cross-shaped dipole The parasitic unit 23 is located above the cylindrical helical antenna radiator, and the distance between the cross-shaped crossed oscillator parasitic unit 23 and the cylindrical helical antenna radiator is 0.25 wavelengths, and the power division phase-shifting broadband microstrip feed network 8 is located at The bottom of the cylindrical helical antenna radiator is connected with the bottom of the cylindrical helical antenna radiator.

[0035] The cylindrical helical antenna radiator includes four metal helical arms 4~7, and the four metal helical arms 4~7 are placed orthogonally in space along the side of the cylinder and wo...

Embodiment 2

[0042] Except for the distance between the parasitic unit of the cross-shaped crossed oscillator and the radiator of the cylindrical helical antenna, and the length of the oscillator, other features of this embodiment are the same as those of Embodiment 1.

[0043] In this embodiment, the distance between the parasitic unit of the cross-shaped cross oscillator and the radiator of the cylindrical helical antenna is 0.4 wavelengths.

[0044] The vibrator of this embodiment is used as an antenna director, the length is 0.42 wavelengths, and its right-handed gain curve is as follows Image 6 shown.

Embodiment 3

[0046] Except for the length of the vibrator in this embodiment, other features are the same as those in Embodiment 1.

[0047] The vibrator of this embodiment is used as an antenna reflector with a length of 0.7 wavelengths, and its right-handed gain curve is as follows Figure 7 shown.

technical field

[0001] The invention relates to a circularly polarized helical antenna, in particular to a circularly polarized helical antenna with high and low elevation angle gain. Background technique

[0002] At present, the application of global positioning and navigation systems is becoming more and more extensive. China's Beidou second-generation system has basically covered the Asia-Pacific region and is expected to cover the whole world in the next ten years. Circularly polarized antennas play a vital role in this system. effect. According to the positioning principle, the low elevation signal close to the ground contributes the most to the positioning accuracy, while the zenith signal is easy to accept but does not contribute much to the positioning accuracy. With the improvement of positioning accuracy requirements, the antenna is generally required to have a higher low-elevation gain, especially for the Beidou system, which has relatively few satellites, and pu...

Examples

Embodiment 1

[0034] Such as figure 1 As shown, a circularly polarized helical antenna with high and low elevation angle gain in the present invention includes a cylindrical helical antenna radiator, a cross-shaped cross-shaped dipole parasitic unit 23 and a power-division phase-shifting broadband microstrip feed network 8, and the cross-shaped cross-shaped dipole The parasitic unit 23 is located above the cylindrical helical antenna radiator, and the distance between the cross-shaped crossed oscillator parasitic unit 23 and the cylindrical helical antenna radiator is 0.25 wavelengths, and the power division phase-shifting broadband microstrip feed network 8 is located at The bottom of the cylindrical helical antenna radiator is connected with the bottom of the cylindrical helical antenna radiator.

[0035] The cylindrical helical antenna radiator includes four metal helical arms 4~7, and the four metal helical arms 4~7 are placed orthogonally in space along the side of the cylinder and wo...

Embodiment 2

[0042] Except for the distance between the parasitic unit of the cross-shaped crossed oscillator and the radiator of the cylindrical helical antenna, and the length of the oscillator, other features of this embodiment are the same as those of Embodiment 1.

[0043] In this embodiment, the distance between the parasitic unit of the cross-shaped cross oscillator and the radiator of the cylindrical helical antenna is 0.4 wavelengths.

[0044] The vibrator of this embodiment is used as an antenna director, the length is 0.42 wavelengths, and its right-handed gain curve is as follows Image 6 shown.

Embodiment 3

[0046] Except for the length of the vibrator in this embodiment, other features are the same as those in Embodiment 1.

[0047] The vibrator of this embodiment is used as an antenna reflector with a length of 0.7 wavelengths, and its right-handed gain curve is as follows Figure 7 shown.

Images