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Sensing parts and principles of antenna
Time:2020-10-29 Read: 66

Simply put, the inductive antenna is to increase the physical length of the antenna, that is, the height of the antenna, thereby improving the antenna efficiency.


The following are the induction parts and principles of the antenna:

(1) Concentrated inductance loading of antenna

The method of increasing the effective height of the antenna by inserting an inductive coil is called the inductive loading method. The concentrated loading of the antenna is to insert an inductive coil at a certain point in the middle of the antenna. The inductive reactance of this inductive coil can offset all or part of the capacitive reactance of the antenna element at this point, thereby increasing the increase The antenna current below the sensing point increases the effective height of the antenna. This method of inserting a coil in the middle of the antenna is commonly used in vehicle-mounted station antennas (chuck antennas).


(2) The distributed inductance loading method of the antenna

The distributed inductance loading of the antenna is to add inductance to the antenna evenly, an example of which is the spiral whip antenna widely used in mobile communications. The spiral whip antenna is made of spring steel wire and then coated with a layer of medium, such as rubber, etc. The main function of the medium is to fix the relative position between the coils, which forms a distributed loading antenna loading feeling Distributed at the beginning of the spiral coil of the whip antenna.

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