Segmentation-line-based high-isolation bipolarized MIMO loop antenna
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A high-isolation, loop antenna technology, applied in loop antennas, antennas, antenna coupling and other directions, can solve difficulties and affect antenna radiation efficiency, and achieve high isolation, simple structure, easy processing and realization
Inactive Publication Date: 2017-06-30
COMMUNICATION UNIVERSITY OF CHINA
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[0004] 1) There is a large coupling between antennas that are very close to each other, which affects the radiation efficiency of the antenna. Therefore, how to obtain a low-coupling and co-point orthogonal dual-polarized electric and magnetic dipole antenna through the design of the antenna structure exists more difficult;
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Embodiment 1
[0034] A segmented line-based high-isolation dual-polarized MIMO loop antenna is composed of a segmented line-based loop structure and two feed structures.
[0035] A high-isolation dual-polarized MIMO loop antenna based on a segmented line, based on a periodic structure of a segmented line, consisting of two inner and outer rings, such as figure 1 As shown, both the outer ring 20 and the inner ring 30 are located on the upper surface of the dielectric layer, they have a similar structure, and are composed of a first outer ring segment line 21, a second outer ring segment line 22, a third outer ring segment line, and a third outer ring segment line. Ring segment line 23, fourth outer ring segment line 24, fifth outer ring segment line 25, sixth outer ring segment line 26, seventh outer ring segment line 27, eighth outer ring segment line 28 , the first inner ring segment line 31, the second inner ring segment line 32, the third inner ring segment line 33, the fourth inner rin...
Embodiment 2
[0039] A high-isolation dual-polarized MIMO loop antenna based on segmented lines. To obtain a loop antenna that can be equivalent to an ideal magnetic dipole, the current distribution on the loop should be equal in magnitude and in the same direction. By using a segmented line antenna with a periodic structure, when the current direction on the loop antenna is reversed, as shown in Figure 4(a), its radiation can be equivalent to an electric dipole antenna. directional, as shown in Figure 4(b), its radiation is equivalent to a magnetic dipole antenna.
[0040] refer to figure 1 , is the three-dimensional picture , including the first outer ring segment line 21, the second outer ring segment line 22, the third outer ring segment line 23, the fourth outer ring segment line 24, and the fifth outer ring segment line of the segmented metal ring on the upper surface. Segmented line 25, the sixth outer ring segmented line 26, the seventh outer ring segmented line 27, the eighth ou...
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Abstract
The invention, which relates to the antenna design field of the communication technology, provides a segmentation-line-based high-isolation bipolarized MIMO loop antenna. On the basis of a same annular structure, two kinds of orthogonal radiating modes are obtained by different exciting points and structures, thereby realizing an electro-magnetic dipole with concurrent orthogonality and an orthogonal directional diagram. When feeding is carried out by using coplanar parallel transmission lines at a first port 100, the loop antenna based on segmented periodic structure with equivalent capacitance loading will generate ring currents with uniform amplitudes and same directions, wherein the radiation characteristic of the loop antenna is equivalent to that of a magnetic dipole. An equiamplitude and inverted excitation current is inputted at a second port 101 by using a T type microstrip feeder structure; and the radiation characteristic of the loop antenna is equivalent to that of an electric dipole. The bipolarized antenna has high isolation and does not need any extra coupling reducing structure. Moreover, the bipolarized MIMO loop antenna having a single-layer planar structure has advantages of having simple and compact structure and being easy to process and realize.
Description
technical field [0001] The invention relates to a segmented line-based high-isolation dual-polarization MIMO loop antenna, which belongs to the antenna design field of communication technology. Background technique [0002] In recent years, with people's requirements for high-speed data transmission, the multiple-input multiple-output (MIMO) system has been widely used in the actual communication field because it can greatly improve the reliability and throughput of the communication system. When radio waves propagate indoors or outdoors with multiple paths, the polarization mode may change greatly after complex reflection, scattering and diffraction. In order to effectively transmit and receive signals, the receiving and transmitting ends adopt The MIMO system composed of antennas with polarization diversity characteristics is particularly important. Compared with the MIMO system composed of single-polarized antennas, the MIMO system composed of dual-polarized antennas can ...
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