Four-arm spiral antenna

Abstract

The invention discloses a four-arm spiral antenna. The four-arm spiral antenna comprises a spiral arm, and the spiral arm comprises a first spiral arm portion, at least one second spiral arm portion arranged at an interval from the first spiral arm portion, and a third spiral arm portion, wherein one end of the first spiral arm portion and one end of the second spiral arm portion are connected with one end of the third spiral arm portion, and the other end of the third spiral arm portion is connected with a spiral arm feed end feeding the spiral arm. The spiral antenna provided by the invention can realize multi-frequency-range work of more than two frequency ranges with quite large frequency intervals and can also adjust input impedance of the spiral antenna through structural adjustment of the spiral arm of the spiral antenna so as to realize impedance match between an input port and a feed pot, reduce energy loss and improve the overall gain of the antenna. The spiral antenna provided by the invention is compact in structure, light in weight, small in volume and easy to process.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a helical antenna, in particular to a four-arm helical antenna. Background technique [0002] With the development of the satellite navigation system, especially with the development and improvement of my country's Beidou satellite navigation system, the navigation and positioning and mobile communication based on the Beidou satellite have gained more and more applications in the military and civilian fields, such as transportation monitoring , hydrological monitoring, flood control and flood control, and providing comprehensive services such as positioning, communication and timing, thus playing an increasingly important role in people's work and life. [0003] In satellite navigation technology and satellite communication technology, as a receiving and transmitting antenna for satellite signals, a helical antenna, especially a quadrifilar helix antenna (Quadrifilar Helix Antenn...

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Problems solved by technology

[0004] However, the existing quadrifilar helical antenna is a narrow-bandwidth resonant antenna, and it is very difficult to achieve multi-band operation of broadband or more than two frequency bands, especially the existing quadrifilar helical antenna cannot realize the frequency separation Multi-band work with more than two frequency bands, and it is impossible to adjust the input impedance of the quadrifilar helical antenna, so as to achieve impedance matching between the input port and the feed port, so as to reduce energy loss and increase the overall gain of the antenna

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