Radiation pattern measuring method and system for internal antenna of wireless smoke detector

Abstract

The embodiment of the invention provides a radiation pattern measuring method and system for an internal antenna of a wireless smoke detector. The method comprises the following steps: obtaining a reference point location and test point locations according to the distance between an auxiliary antenna and the wireless smoke detector; enabling the axis of an internal antenna in the wireless smoke detector to be parallel to the ground plane, and testing a radiation signal of the internal antenna through the auxiliary antenna to obtain a first test data set; enabling the axis of the internal antenna in the wireless smoke detector to be perpendicular to the ground plane, and testing a radiation signal of the internal antenna through the auxiliary antenna to obtain a second test data set; obtaining first relative field intensity corresponding to each test point location according to the first test data set, and obtaining second relative field intensity corresponding to each test point location according to the second test data set; and obtaining a radiation pattern of the internal antenna in the wireless smoke detector according to the first relative field intensity and the second relative field intensity. According to the embodiment of the invention, the radiation pattern of the internal antenna of a finished wireless smoke detector can be measured more quickly and accurately.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a radiation pattern measurement method and system for an internal antenna of a wireless smoke detector. Background technique [0002] Smoke detectors are the most commonly used fire detection alarms. Compared with traditional smoke detectors, the new wireless smoke detectors in recent years are characterized by the integration of wireless transmission modules, which send alarm signals through internal antennas, thereby No wiring is required, and it can be combined with Internet of Things technology, becoming one of the important aspects of smart city construction. Among them, the distance range and success rate of the wireless smoke detector to send the alarm signal mainly depend on the radiation characteristics of the internal antenna. [0003] The radiation pattern is a graphical description method for the radiation characteristics of the antenna, which refers to the graph of...

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Problems solved by technology

[0004] However, the existing antenna radiation pattern measurement method cannot be used for the internal antenna of the finished wireless smoke detector. The main reason is that the existing measurement method cannot make the internal antenna accurately radiate a fixed-sized field.

Specifically, the internal antenna is welded on the circuit board and cannot be connected to an external signal generator. Even if a signal is sent to the internal antenna through the wireless smoke detector's own circuit, the signal size cannot be accurately maintained due to its own circuit principle. At a fixed value, and the signal is an instantaneous signal, it is not suitable for observation by a spectrum analyzer

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