Patch antenna capable of being operated in elliptical radiation mode

Abstract

The invention provides a patch antenna capable of being operated in an elliptical radiation mode, which is characterized by comprising a metal sheet capable of being operated in the elliptical radiation mode, a dielectric layer at the lower part of the metal sheet, and a power supply line connected with the metal sheet via a channel and used for transmitting message-reading signals to the metal sheet or receiving message-writing signals from the metal sheet.

Description

Technical field [0001] The present invention relates to a patch antenna, and more specifically, to a patch antenna having an elliptical radiation pattern applicable to indoor monitoring of vehicles. Background technique [0002] Generally, a vehicle intrusion sensing system uses a patch antenna to sense the intrusion of a vehicle. [0003] Generally, the radiation pattern of a patch antenna is close to a circular shape, and the sensing area is also close to a circular shape. [0004] Therefore, the vehicle intrusion sensing system utilizes the interference effect of two or more patch antennas in order to apply the sensing area of ​​the patch antenna in a vehicle close to a square. [0005] But like figure 1 As shown, a patch with a rectangular radiation pattern has a sensing area spread to the outside of the vehicle, so there is a problem of erroneous sensing of actions outside the vehicle (see figure 1 False sensing area). [0006] However, in order to prevent erroneous sensing of the...

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Problems solved by technology

[0005] However, if figure 1 As shown, the patch with a rectangular radiation pattern, the sensing area will spread to the outside of the vehicle, so there is a problem of false sensing of the movement outside the vehicle (refer to figure 1 false sensing area)

[0006] However, when the output power (Power) is reduced in order to prevent false sensing of the movement outside the vehicle, there will be a shadow area where the movement in the vehicle interior cannot be sensed, and the problem of intrusion detection in the vehicle interior cannot be performed normally.

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