Near-field active mirror image focusing antenna

Abstract

The invention discloses a near-field active mirror image focusing antenna, which comprises a receiving antenna array, a transmitting antenna array, a phase conjugate circuit module, an illuminating antenna, a base and an illuminating antenna mobile station. The near-field active mirror image focusing antenna can be used for microwave hyperthermia, microwave detection and microwave energy transmission. The near-field active mirror image focusing antenna has the advantages that a focal position is controllable, multiple focuses can be formed, low side-lobe amplitude distribution is formed on a transmitting aperture surface in a self-adaptive manner, and the focusing effect is excellent.

Description

technical field [0001] The invention belongs to the field of microwave and millimeter wave systems, in particular to a near-field active image focusing antenna. Background technique [0002] Focusing antennas have the ability to focus electromagnetic energy in a certain space range. Because they can concentrate a large amount of energy in a very small space range, they are widely used in microwave hyperthermia, microwave energy transmission, near-field communication, and microwave detection. [0003] Traditional focusing antennas are mainly based on passive arrays, which are divided into planar focusing antennas and non-planar focusing antennas. Most planar focusing antennas use metal patches as array elements. By controlling the phase of the radiation field of the metal patch, the phase of the entire aperture surface satisfies the spherical distribution, and the near-field electromagnetic energy is focused. Non-planar focusing antennas mostly use dielectric lenses, parabol...

AI Technical Summary

Problems solved by technology

However, the phase conjugate circuit of the lens needs to be frequency-converted twice, and the phase-locking technology is adopted at the same time, so the whole circuit structure is relatively complicated.

At the same time, due to the use of phase-locking technology, the signal amplitude of each output is the same, so the amplitude cannot be adjusted

In addition, the phase-locked loop can only lock one signal, so the lens cannot form a multi-focus spot

Moreover, the lens is only composed of a one-dimensional line array, so it cannot form a focal spot, but can only form a cylinder with relatively concentrated energy at a fixed position.

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