Dual-mode antenna array and matching method for dual-mode antenna array

Abstract

The invention discloses a dual-mode antenna array, comprising a dual-mode antenna, a switch, a conducting transmission line, an antenna unit and an open-circuit transmission line. The switch has a first terminal, a second terminal and a third terminal. The first terminal of the switch is connected to the dual-mode antenna. The switch is controlled by a control signal to select an operating state to conduct the first terminal to the third terminal or the second terminal. The impedance of the dual-mode antenna in the first frequency band and the second frequency band is one half to one time the impedance of the conducting transmission line. The antenna unit is connected to the second end of the switch through a conducting transmission line. An open-circuit transmission line whose impedance is one-half the impedance of the conducting transmission line is connected to the third end of the switch. In mode zero, the impedance in the first frequency band and the impedance in the second frequency band measured by the first feeding end of the dual-mode antenna have a first reactance value and a second reactance value, respectively, and the length of the open-circuit transmission line is used to make the first Both the first reactance value and the second reactance value are further away from zero reactance. At the same time, the control of the radiation field pattern and the reduction of the manufacturing cost are realized.

Description

technical field [0001] The invention relates to an antenna array and a matching method of the antenna array, in particular to a matching method of a dual-mode antenna array. Background technique [0002] The radiation pattern of the antenna varies according to the basic working principle of the antenna. For example, a dipole antenna (Dipoleantenna) can produce an omnidirectional (Omnidirectional) radiation pattern, and a patch antenna (Patch antenna) can produce lateral (Broadside) radiation. field type. Various radiation patterns have different applications. For example, an omnidirectional radiation pattern is suitable for terminal devices so that the terminal devices can receive wireless signals from all directions. For another example, base station antennas, such as wireless access point antennas, may need to be able to generate radiation patterns in specific directions, so as to perform wireless communication with terminal devices located in various specific locations. ...

AI Technical Summary

Problems solved by technology

If you want to use a design with multiple antennas (arrays), but also have multi-band operation at the same time, such as the operation requirements of the 2.4GHz frequency band and 5GHz frequency band commonly used in wireless area networks, choose the multi-band antenna design used in traditional array antennas. In addition to considering the transmission loss in detail for each switch and multiple feed-in networks, it is also necessary to consider the impact characteristics of the impedance of the feed-in network stubs on different frequency bands when they are working at multiple frequencies (or dual frequencies), especially in current electronic devices. When the antenna is required to be light, thin and small, the circuit area of ​​the feed-in network that provides dual-band or higher operation is quite large (maybe larger than the antenna array, which makes it difficult to reduce the overall size of the antenna array module), which makes traditional use require complex feed-in networks. When accessing the network to achieve dual-frequency (or multi-frequency) operation, it will cause a substantial increase in the manufacturing cost of antenna array products

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