Low Profile uhf Broadband Circularly Polarized Handheld Terminal Antenna

Abstract

The invention provides a low profile UHF broadband circular polarization hand-held terminal antenna; the hand-held terminal antenna comprises an intersect dipole and a feed network; the intersect dipole antenna comprises symmetrically intersecting two arms and a microstrip line connecting portion; the feed network is connected with an upper end microstrip line through a floor through hole. The low profile UHF broadband circular polarization hand-held terminal antenna is simple in structure, low in making cost, thus reducing the antenna profile while ensuring the sizes, realizing a very wide work frequency range and high radiation gains, realizing circular polarization radiation in the same time, ensuring a very wide 3dB axial ratio bandwidth, and providing wide application prospects.

Description

technical field [0001] The invention relates to a handheld terminal antenna, in particular to a low-profile UHF broadband circularly polarized handheld terminal antenna. In particular, it relates to a low-profile broadband circularly polarized crossed dipole antenna, which works in the UHF frequency band and can be applied to some specific UHF handheld terminal antennas. Background technique [0002] With the development of wireless communication technology, wireless electronic products are becoming thinner and thinner, and the space left for antennas in design is also smaller, and more need to be integrated with radio frequency circuits, so the demand for miniaturized antenna systems is increasing more. [0003] In this context, the miniaturization design of miniaturized UHF handheld terminal antennas has received more and more attention. Due to the low operating frequency and long wavelength in this frequency band, it is difficult for traditional antennas to meet the appl...

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Problems solved by technology

[0003] In this context, the miniaturization design of miniaturized UHF handheld terminal antennas has received more and more attention. Due to the low operating frequency and long wavelength in this frequency band, it is difficult for traditional antennas to meet the application requirements of small terminals. At the same time, there is an antenna bandwidth , the problem of small gain

As far as the current technology is concerned, most of the UHF terminal handheld antennas use four-arm dipole antennas to generate circular polarization, but they have the disadvantages of high profile and difficult integration

[0004] After literature search, it was found that in 2008, Teniger et al. published "Research on New Loaded Broadband Line Antenna" in the 10th issue of Volume 30 of the journal "Systems Engineering and Electronic Technology", which works in the UHF frequency band and covers the frequency of the handheld terminal antenna. Through the loading of resistors and wafers, broadband characteristics are realized, but the antenna itself is based on a monopole structure, so the size is large and the profile is high, and the loading of resistors leads to a loss of gain.

[0005] It was also found in the search that the patent application number 201520490232.X, the patent name is: miniaturized mobile satellite communication handheld terminal antenna, and the patent publication number 204760536. The antenna in this patent document is applied to the handheld terminal of the satellite communication system, using a four-armed helical antenna Form, to achieve circular polarization, but the profile is high, not easy to integrate design, and because of the shape characteristics of the helix, it is more sensitive to deformation

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