Reconfigurable Sensing Antenna Based on Contactless Rotational Coupling

Abstract

The invention, which belongs to the technical field of antennas, particularly relates to a reconfigurable sensing antenna based on non-contact rotational coupling. The antenna is composed of a metal patch, a dielectric plate, a grounding plate and a back cavity that are arranged successively from top to bottom. The back cavity is a cylindrical cavity with the empty upper top surface. The groundingplate is connected with the back cavity in a matching manner as the upper top surface of the cylinder; and a feed slot is etched in the grounding plate and is connected with an RFID chip. A support rotating shaft is arranged at the center of the back cavity and is connected with the dielectric plate. The metal patch is in close contact with the dielectric plate; and the support rotating shaft drives the metal patch by the dielectric plate to move relatively to the feed slot. The feed slot generates a radiation filed after being excited by the RFID chip and is coupled to the metal patch; the support rotating shaft converts the mechanical rotator of the sensor into the rotation angle of the metal patch, so that the resonant frequency of the antenna is changed; and the reader reads the resonant frequency of the antenna to obtain the mechanical rotator of the sensor.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a reconfigurable sensing antenna based on non-contact rotational coupling. Background technique [0002] Nowadays, people pay attention to changes in the natural environment, and there are a large number of sensors used for environmental monitoring, such as temperature, humidity, pressure, etc. With the development of technology, more and more environmental variables can be monitored, and sensors tend to be miniaturized. Digital, intelligent, multi-functional, systematic and networked. [0003] In practical sensor applications, various mechanical sensors, such as bimetal thermometers, water pressure gauges, barometers and other sensors that rely on pointers to indicate the dial still occupy a large proportion. Such a mechanical dial needs to be manually read at a close distance. In special environments (dangerous environments such as high temperature and high pressu...

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Problems solved by technology

Such mechanical dials need to be read manually at close range. In special environments (dangerous environments such as high temperature and high pressure, or insufficient manpower in large-scale pipelines), this kind of instrument has great disadvantages: First, dangerous environments are not suitable for humans to enter. Distance reading is easy to endanger people's safety; second, the reading of large-scale instruments requires more manpower and material resources

[0004] At present, there are also some occasions where digital active sensors are used. These sensors need to carry batteries, which also have three disadvantages: first, the size of the sensor cannot be further reduced, and cannot be used in some special environments; second, the battery power limits the effective time of the sensor , the battery needs to be replaced frequently; the third is that active devices in high-risk environments are more likely to be affected by the environment, and battery damage is likely to cause huge battery pollution

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