Horizontal polarization omnidirectional antenna based on composite right-left hand transmission line
A technology of left and right hands compounding and horizontal polarization, which is applied in the direction of antenna array, antenna support/installation device, radiation element structure and other directions that are energized separately, and can solve the problem of small radiation resistance, high reactance, and inability to generate horizontal polarization omnidirectional Direction diagram and other issues to achieve the effect of good omnidirectional radiation characteristics and promote development
Inactive Publication Date: 2013-12-04
TSINGHUA UNIV
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Problems solved by technology
However, due to its small radiation resistance and high reactance, the impedance matching of the electric small loop antenna is difficult to achieve
Although the electric large loop antenna can obtain the ideal impedance bandwidth, the magnitude and direction of the current on the loop are not uniform, so that the omnidirectional pattern of horizontal polarization cannot be produced.
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[0023] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0024] In recent years, Left-Handed Metamaterial has been a research hotspot in the fields of materials science and physics. The direction of electric field strength, magnetic field strength and wave vector direction of electromagnetic waves in left-handed materials satisfy the left-handed rule. The left-handed material has a negative dielectric constant and a negative permeability, and it has many special properties that the right-handed medium does not have. The left-handed composite transmission line is a typical application of left-handed materials in the electromagnetic field. Due to the characteristics of both left-handed and right-handed media, the antenna constructed according to it can achieve resonance in positi...
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The invention provides a zero-order resonance loop antenna based on a composite right-left hand transmission line, and the antenna provided by the invention can achieve horizontal polarization omnidirectional coverage by utilizing the zero-order resonance characteristics of the composite right-left hand transmission line and can be used for supporting a communication system of a wireless local area network; and the basic units of the horizontal polarization omnidirectional antenna need the current distribution which has the equal magnitude and the same direction. By adopting the zero-order mode resonance of the composite right-left hand transmission line, because the phase speed of the composite right-left hand transmission line is zero and the current of each section on the loop antenna does not have phase deviation and is uniform and synclastic, the problem of non-uniform current distribution of a radio antenna is solved, and the good impedance bandwidth is obtained. By changing the dimension of the zero-order mode loop antenna, the zero-order mode loop antenna can achieve the coverage of different frequency ranges, has the advantages of simple structure, easiness in realization and good horizontal polarization omnidirectional radiation characteristics of the antenna, provides polarization diversity units for the antenna of a wireless local area network system or a small-sized base station and promotes the development of a novel antenna technique, thus the omnidirectional antennan which has the advantages of miniaturization, multi-polarization and low cost is realized.
Description
Technical field [0001] The invention belongs to the technical field of antenna design of wireless communication technology, and particularly relates to a horizontally polarized omnidirectional antenna based on a left-handed composite transmission line. Background technique [0002] Antenna, as the throat of the mobile communication system, is a system component that radiates and receives electromagnetic waves. The performance of the antenna plays a decisive role in the overall performance of the mobile communication system. With the continuous improvement and development of wireless communication technology, antenna performance must not only meet the characteristics of light weight, small size, simple production, and low cost, but also support the application of distributed antennas, MIMO multiple antennas and other technologies. For a multipath-rich communication environment, polarization diversity has been considered as one of the most optimal multiple input multiple output (M...
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IPC IPC(8): H01Q1/38H01Q21/06H01Q1/22
Inventor 魏鲲鹏张志军冯正和
Owner TSINGHUA UNIV