Quadrangle feeding-based dual-layer waveguide gap near-field focusing array antenna

Abstract

The invention relates to a quadrangle feeding-based dual-layer waveguide gap near-field focusing array antenna, and relates to a waveguide gap antenna. The quadrangle feeding-based dual-layer waveguide gap near-field focusing array antenna comprises a lower-layer feeding waveguide and an upper-layer radiation waveguide, an incident wave sequentially passes through the feeding waveguide, a couplinggap and the radiation waveguide from a feeding port and is finally radiated to an external space by a radiation gap, the feeding port and the feeding waveguide are fed through a central hole from a back surface by employing a standard feeding wave, quadrangle feeding is employed to substitute traditional central feeding, a signal is extended to four antenna angles from the center by the feeding waveguide with four arms, uniform-amplitude and same-direction feeding is performed from two ends to a middle part, a PMC boundary can be formed in the center of the feeding waveguide, thus, a metal boundary is substituted, the size is reduced, and the design cost is reduced. The length of the feeding waveguide is 44.8 millimeters, the width of the feeding waveguide is 5 millimeters, and the heightof the feeding waveguide is 2 millimeters.

Description

technical field [0001] The invention relates to a waveguide slot antenna, in particular to a double-layer waveguide slot near-field focusing array antenna based on four-corner feeding, which can be used in the fields of radio communication, near-field communication, medical detection and the like. Background technique [0002] An antenna array (or array antenna) is an antenna system composed of many identical individual antennas arranged in a certain order to transmit or receive radio waves. Each antenna element is connected to a single receiver or transmitter by a feedline that feeds energy to each antenna element in a specific phase relationship. The radio waves radiated by each individual antenna combine and add up, adding together (possibly by human control) to boost the power radiated in the desired direction and reduce the power radiated in other directions. Among them, the waveguide array antenna refers to an antenna that has a slit on the wide or narrow side of the ...

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Problems solved by technology

[0007] However, most of these waveguide slot arrays have feed ports at the center. When the array is large in size, it is difficult to control the excitation of the array elements to achieve the common Taylor distribution, Gaussian distribution, etc.

Moreover, these antennas work in the far field, and there are few near-field focusing methods. Generally, metal is used as the isolation terminal, and copper is used as the material for isolating electromagnetic waves in most cases, which will increase the cost in some cases.

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