Antenna device

Abstract

The invention relates to the field of communications, and discloses an antenna device. The antenna device comprises a circuit board provided with a feed point and a ground point and a shell containing the circuit board, an antenna radiator is arranged on the shell and comprises a loop antenna working in a multiband and a capacitive feed unit which is separated from the loop antenna in a spaced mode and works in a high-frequency band; one end of the loop antenna is electrically connected with a matching circuit arranged on the circuit board, and the other end of the loop antenna is connected with the ground point; the capacitive feed unit is connected with the feed point, the capacitive feed unit and the partial loop antenna are arranged in parallel to achieve capacitive feed; the matching circuit comprises an inductor and a radio frequency adjustable capacitor electrically connected with the inductor in parallel to achieve low-frequency tuning on the loop antenna so as to cover the whole low frequency. Compared with the prior art, communication full band covering can be achieved simply by switching three to four states.

Description

Technical field [0001] The present invention relates to the field of communication, in particular to an antenna device. Background technique [0002] With the rapid development of communication technology, LTE (Long Term Evolution) requires antennas to cover more and more frequency bands, while the low frequency (698-960MHz) and high frequency (LTE band11&21) frequency bands are more difficult to achieve. In the prior art, the above low frequency and high frequency are usually realized by adding an RF switch or tuner divided state, or realized by dividing frequency bands by multiple antennas. However, the inventor of the present invention found that, in the prior art, when the state is implemented, it is difficult to meet the CA requirements or needs to switch many states to achieve, and the process is extremely cumbersome; and when multiple antennas are implemented in frequency bands, the multiple antennas will not only Occupies more area, increases the complexity of stacking, ...

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention have found that, in the prior art, it is difficult to meet the requirements of CA or many states need to be switched to achieve the implementation in the prior art, and the process is extremely cumbersome. Occupies more area, increases the complexity of stacking, and introduces the problem of isolation between multiple antennas

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