Elliptical Slot Circularly Polarized Microstrip Antenna

Abstract

The invention discloses an elliptical slot circularly polarized microstrip antenna, which relates to the fields of communication and measurement and control. The microstrip antenna includes a reflection floor 1, a dielectric board 2 and a coaxial cable 3, the upper surface of the dielectric board 2 is provided with a microstrip feeder 4, the lower surface of the dielectric board 2 is provided with an elliptical gap 5 formed by corrosion, and the microstrip feeder 4 The projected length in the elliptical slit 5 is less than half of the long axis of the elliptical slit 5 . The invention is designed according to the requirements of communication, measurement and control on polarization purity and installation space, and has the characteristics of wide standing wave bandwidth and wide axial ratio bandwidth; the invention also has the characteristics of low profile, small size, easy integration, etc., and is especially suitable for communication, measurement and control Fabrication of High Performance Low Profile Circularly Polarized Antennas for Aircraft Carriers in Systems.

Description

technical field [0001] The invention relates to an elliptical slot circularly polarized microstrip antenna in the fields of communication and measurement and control. The invention is more suitable for use in communication and measurement and control systems requiring circularly polarized radiation antennas. Background technique [0002] At present, the microstrip antennas that can form circular polarization in communication and measurement and control systems mainly have the following structural forms. Although they have their own characteristics in performance, they all have certain shortcomings. [0003] 1. Cutting angle circularly polarized microstrip antenna: This type of antenna has a simple structure and a low profile, but the axial ratio and standing wave bandwidth of the antenna are less than 2%. [0004] 2. Circularly polarized microstrip antenna form with external circularly polarized bridge. The axial ratio and standing wave bandwidth of this form of microstrip a...

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Problems solved by technology

[0004] 2. Circularly polarized microstrip antenna form with external circularly polarized bridge. The axial ratio and standing wave bandwidth of this form of microstrip antenna are generally wider than 3dB. The axial ratio bandwidth is greater than 15%, and the standing wave bandwidth of less than 2 is greater than 20. %, but the external circular polarization bridge takes up a lot of space, the feeder is long, and the difference loss is large, which is not conducive to the integrated design of antenna and network

[0005] 3. Slot-coupled circularly polarized microstrip antenna. Compared with the traditional circularly polarized microstrip antenna, this form of circularly polarized microstrip antenna has the characteristics of wide impedance and axial ratio bandwidth, but due to the asymmetry of the slot structure, It is often necessary to load an isolation resistor to achieve a wider axial ratio bandwidth, which creates two problems: on the one hand, the isolation resistor requires manual welding, and when the array scale is large, it requires a huge workload, and it is difficult to ensure the consistency of unit welding On the other hand, the isolation resistance will produce a certain difference loss, resulting in different degrees of decline in radiation gain

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