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Horizontal polarization hyper-frequency band high-gain minitype flat printing isotropic antenna

A horizontally polarized, omnidirectional antenna technology, which is applied to antennas, electrical components, radiating elements, etc., can solve problems such as difficult to use, and achieve the effect of increasing gain, high gain, and reducing antenna size

Inactive Publication Date: 2005-12-21
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if its horizontally polarized radiation characteristics are recognized and the requirements for other electrical performance parameters are relaxed, structures larger than twice the wavelength are difficult to use in actual vehicle systems in the UHF band

Method used

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  • Horizontal polarization hyper-frequency band high-gain minitype flat printing isotropic antenna
  • Horizontal polarization hyper-frequency band high-gain minitype flat printing isotropic antenna
  • Horizontal polarization hyper-frequency band high-gain minitype flat printing isotropic antenna

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] according to figure 1 The structure shown actually processed a pair of basic planar printed antennas, and the main electrical performance parameters S of the antennas were measured experimentally. 11 , VSWR, gain and radiation pattern. The example antenna design is tuned to 722MHz. The frequency range of standing wave ratio less than 1.5 is 706~742MHz, and the standing wave ratio is the smallest at 723.5MHz, which is 1.16. The measured antenna gain is greater than 3dB. The inhomogeneity of the E-plane (θ=90°) pattern is less than 4.5dB, and occurs at the feeder outlet port and the 45° inclined coplanar waveguide.

Embodiment 2

[0038] according to figure 2 The structure shown actually processed a pair of planar printed antennas with parasitic slot lines, and experimentally measured the main electrical performance parameters S of the antenna 11 , VSWR, gain and radiation pattern. The example antenna design is tuned to 722MHz. The frequency range of standing wave ratio less than 1.5 is 699~738MHz, and the standing wave ratio is the smallest at 719.5MHz, which is 1.20. The measured antenna gain is greater than 4.5dB. The inhomogeneity of the E-plane (θ=90°) pattern is less than 5.0dB, and occurs at the feeder outlet port and the 45° inclined coplanar waveguide.

Embodiment 3

[0040] according to image 3 The structure shown actually processed a pair of planar printed antennas with a 45° inclined coplanar waveguide gap connected to the capacitance, and the main electrical performance parameters S of the antenna were measured experimentally. 11 , VSWR, gain and radiation pattern. The example antenna design is tuned to 722MHz. The frequency range of standing wave ratio less than 1.5 is 708-758MHz, and the standing wave ratio is the smallest at 725.3MHz, which is 1.12. The measured antenna gain is greater than 6.0dB. The inhomogeneity of the E-plane (θ=90°) pattern is less than 8.0dB, which occurs at the feeder outlet port and the 45° inclined coplanar waveguide.

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Abstract

A small planar printed omnidirectional antenna with high gain in the horizontally polarized ultra-high frequency band, which uses a combination of coplanar waveguide and slot line to form a planar printed antenna structure with a mixed radiating part and feeding part. The antenna and its feeding structure are composed of two A vertically intersecting coplanar waveguide, four slot lines connected to the port of the coplanar waveguide, and every two slot line ends are bent to form four inclined coplanar waveguides with short-circuit terminals. The antenna consists of the center point where the coplanar waveguide intersect Connected coaxial cable excitation. In addition, parasitic slot lines can be placed in parallel on the outside of each slot line, and a capacitor can be connected to the terminal of the inclined coplanar waveguide to further improve radiation efficiency and antenna gain. The antenna of the invention realizes horizontal polarization and omnidirectional radiation along the substrate plane, and can be used in mobile digital TV reception, especially in various vehicle mobile TV reception systems limited by size and installation conditions.

Description

Technical field: [0001] The invention relates to a small horizontally polarized antenna, in particular to a horizontally polarized ultra-high frequency (UHF) band high-gain small flat-printed omnidirectional antenna for multimedia digital communication. Background technique: [0002] At present, wireless communication represented by mobile communication is developing rapidly. With the improvement of communication capacity, quality, content and other requirements and the development of integrated circuit technology, people pay more and more attention to multimedia digital communication methods. At the same time, mobile reception has become one of the main communication methods because it can greatly meet the needs of users. Therefore, higher and higher requirements are placed on the receiving antenna. For example, after the broadcast of digital TV, buses and various cars will be one of the main users. Most of my country's TV transmission adopts horizontal polarization, so r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/38H01Q13/08
Inventor 金荣洪周旭竹
Owner SHANGHAI JIAOTONG UNIV