Small-size lifesaving antenna

Abstract

The invention relates to a small-size lifesaving antenna which comprises a loaded circuit. The loaded circuit is composed of at least three loaded circuit bodies which are connected through circuit metal connecting conductors. The three loaded circuit bodies are connected with one another through the at least three metal connecting conductors of different lengths. One loaded circuit body comprises a first PCB, a resistor R10, an inductor L10 and a capacitor C10, wherein the resistor R10, the inductor L10 and the capacitor C10 are welded to the first PCB. Another loaded circuit body comprises a second PCB, a resistor R20, an inductor L20 and a capacitor C20, wherein the resistor R20, the inductor L20 and the capacitor C20 are welded to the second PCB. The rest loaded circuit body comprises a third PCB, an inductor L31, an inductor L32, an inductor L33, a resistor R31, a resistor R32, a resistor R33, a capacitor C31, a capacitor C32, a capacitor C33 and a transmission line transformer T, wherein the inductor L31, the inductor L32, the inductor L33, the resistor R31, the resistor R32, the resistor R33, the capacitor C31, the capacitor C32, the capacitor C33 and the transmission line transformer T are welded to the third PCB. The small-size lifesaving antenna is simple and reasonable in structural design, small in size, capable of being arranged in the system, convenient to use, capable of effectively lowering the wave influence of a wind turbine, and capable of meeting the using demands for the small antenna, wide bands and large gains by loading.

Description

technical field [0001] The invention relates to a communication antenna, in particular to a small-sized lifesaving antenna. Background technique [0002] At present, the lifesaving antennas used in my country's surface lifesaving systems are all external whip antennas. This type of antenna has the following disadvantages and problems to be solved: [0003] (1) The size is too long [0004] The lifesaving antenna (frequency ranges from 120MHz to 123MHz & 240MHz to 250MHz) is limited by its own frequency band. Generally, the minimum size of the antenna is about 550mm. Because this size is too long, it cannot be installed inside the lifesaving system. [0005] (2) The antenna is easily scratched and collided by external objects [0006] The antenna should be installed at the highest point of the shell after the lifesaving system is stationary on the water surface, so that the antenna is not shielded and reflected, so as to realize the effective transmission of electromagnetic...

AI Technical Summary

Problems solved by technology

[0004] The lifesaving antenna (frequency is 120MHz~123MHz&240MHz~250MHz) is limited by its own frequency band. Generally, the minimum size of the antenna is about 550mm. Because this size is too long, it cannot be installed inside the lifesaving system.

[0005] (2) The antenna is easily scratched and collided by external objects

However, the antenna is placed outside the system and is located at a high point, which is easily scratched and collided by external objects, which will cause damage or even failure of the antenna, and ultimately affect the normal operation of the entire lifesaving system.

[0007] (3) The antenna is easy to swing

Because the antenna itself is a whip antenna, the radiation direction of the antenna is not omnidirectional in space, so that the pattern of the antenna changes during the swing process, which ultimately affects the normal operation of search and rescue.

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