Tri-polarized slot antenna of grid slit ground coplanar waveguide feed capacitor loaded step impedance
A step impedance and waveguide feeding technology, which is applied to slot antennas, antennas, antenna grounding devices, etc., can solve the difficulties in impedance matching of slot antenna feeding transmission lines, the decline of spectral efficiency and channel capacity, and the deterioration of antenna port isolation, etc. problem, achieve the effect of improving isolation between ports, realizing miniaturization, and reducing electrical size
Inactive Publication Date: 2016-06-22
SOUTHEAST UNIV
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Problems solved by technology
A large metal ground will have a shielding effect on the radiation of the antenna, making the slot antenna unsuitable for co-located multiple-input multiple-output (MIMO) applications, especially when used as a multi-polarized antenna, a large metal ground will cause the antenna to Poor cross-polarization, poor isolation between antenna ports, which will lead to a decrease in spectral efficiency and channel capacity
At the same time, the impedance of the slot is very large, which also makes the impedance matching of the slot antenna feeding transmission line more difficult.
Method used
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Embodiment Construction
[0016] The present invention will be further described below in conjunction with drawings and embodiments.
[0017] The embodiment adopted by the present invention is: the three-polarization slot antenna of the coplanar waveguide feeding capacitively loaded step impedance of the grid slot includes three vertically placed single-polarized grid slot ground capacitance loaded step impedance antennas 13 ; The capacitively loaded step impedance antenna 13 of each single-polarized grid slot includes a dielectric substrate 1, a metal ground 2 disposed on the dielectric substrate 1, a radiation slot 3, and a coplanar waveguide feeder 4; one side of the dielectric substrate 1 is The metal ground 2 and the coplanar waveguide feeder 4, the ground plane 5 of the coplanar waveguide feeder 4 is the metal ground 2; there is a radiation slot 3 on the metal ground 2, the shape of the radiation slot 3 is rectangular, and the radiation slot 3 is located on the metal ground The center of 2; the g...
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The invention discloses a tri-polarized slot antenna of grid slit ground coplanar waveguide feed capacitor loaded step impedance, belongs to a slot antenna. The antenna is composed of three single-polarized antennas (13) vertical to each other; each antenna (13) comprises a dielectric substrate (1), a metal ground (3) and a radiation slot (3) on the dielectric substrate, and a coplanar waveguide feeder; the metal ground (2) is provided with the radiation slot (3) and a plurality of parallel grid slits (6); two ends of the radiation slot (3) are short-circuited; a plurality of capacitors (7) are connected in parallel in the middle of the radiation slot (3) and bridged at the edge thereof to form a low-impedance slot (8); the rest part of the radiation slot (3) is the high-impedance slot (9); a conductor (5) out of the coplanar waveguide feeder (4) is connected with the metal ground (2), the conductor (12) in the tail end thereof is connected with the metal ground (2) after bridging at the edge (11) of the high-impedance slot (9). The antenna is in multiband working, capable of reducing antenna size, cross polarization and shielding and improving isolation.
Description
technical field [0001] The invention relates to a slot antenna, in particular to a three-polarization slot antenna in which the coplanar waveguide feeding capacitance of the grid slot loads a step impedance. Background technique [0002] The slot antenna is the dual antenna of the dipole antenna and has a wide range of applications. However, the ordinary slot antenna not only needs half the wavelength of the radiation slot itself, but also needs a large metal ground area around the radiation slot, usually the length of the metal ground is 1 / 2 larger than the length of the slot One wavelength, the width of the metal ground is one-half wavelength larger than the width of the slot. Multi-polarization MIMO can effectively improve spectrum efficiency and channel capacity. In order to apply MIMO technology to small terminals, antennas with different polarizations need to be co-located. A large metal ground will have a shielding effect on the radiation of the antenna, making the ...
Claims
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IPC IPC(8): H01Q1/38H01Q1/48H01Q13/10H01Q5/10
CPCH01Q1/38H01Q1/48H01Q5/10H01Q13/10
Inventor 殷晓星李筱赵洪新
Owner SOUTHEAST UNIV