Miniaturized dual-band microstrip circularly polarized antenna

Abstract

The embodiment of the invention provides a miniaturized dual-band microstrip circularly polarized antenna. The miniaturized dual-band microstrip circularly polarized antenna comprises an antenna radiation module, an equivalent magnetic medium module, a decoupling isolation module and a power division feed network module. By loading the equivalent magnetic medium module, the gain of the antenna inthe working frequency band is effectively improved, and the out-of-band filtering of the working band is realized. According to the invention, the slot structure is loaded to be combined with the decoupling isolation module, so that the isolation degree between the antenna and the polarized port is improved. By loading the power division feed network module to be matched with the overall design, the miniaturization and double-frequency design of the antenna is realized. The antenna is compact in structure and small in size, and the problems that an existing microstrip circularly polarized antenna is large in size, high in profile, limited in bandwidth and low in gain are solved.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a miniaturized dual-band microstrip circularly polarized antenna. Background technique [0002] The antenna is a device that effectively radiates electromagnetic waves into space, and the size of the antenna is closely related to the operating frequency of the antenna. When the operating frequency of the antenna is low, the overall size of the antenna is too large to become an important factor restricting the application of the antenna. Commonly used circularly polarized antennas mostly use the multi-feed method combined with the coupled feed form to achieve broadband, multi-frequency, and miniaturization; [0003] Existing microstrip circularly polarized antennas have at least the following problems: [0004] 1. Existing broadband microstrip circularly polarized antennas are often implemented by multi-feed method. While using four-feed method and more feed points, the couplin...

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Problems solved by technology

[0004] 1. Existing broadband microstrip circularly polarized antennas are often implemented by multi-feed method. While using four-feed method and more feed points, the coupling between the same polarization ports is too large to make the gain of the microstrip circularly polarized antenna cannot be effectively reflected

[0005] 2. Existing broadband microstrip circularly polarized antennas mostly form broadband and multi-frequency bands by combining different resonant points corresponding to different positions on the antenna radiation patch, which makes it impossible to flexibly expand the operating frequency of the antenna to wider frequency bands

[0006] 3. The existing broadband microstrip circularly polarized antenna realizes dual-band and mostly uses active devices for filtering, which makes the working environment of the antenna more complicated and increases the design cost

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