All-metal-ring narrow-frame 4G smart phone antenna

Abstract

The invention discloses an all-metal-ring narrow-frame 4G smart phone antenna. The smart phone antenna comprises a PCB and a system floor; a metal ring is wound around the periphery of the PCB; a gap is formed between the metal ring and the PCB; a feed port used for dividing the metal ring into two annular antennas is formed in the metal ring; the base modes and higher order modes of the two annular antennas jointly cover six frequency bands; the smart phone antenna also comprises a grounding metal sheet and a matching circuit which is formed by a capacitive element and an inductive element connected in parallel; the matching circuit is arranged between the grounding metal sheet and the system floor; the metal ring and the matching circuit jointly form a radiation unit of the antenna; and the self resonance of the capacitive element and the inductive element influences the input impedance value of the dual annular antennas in a low frequency, so that the resonant points at the low frequency band are increased. By adoption of the structure, when the antenna is applied to all-metal-ring surrounding, the metal structure is not damaged while seven-frequency-band 4G coverage can be realized; and meanwhile, the smart phone antenna is more in frequency bands, high in radiation efficiency, narrow in frame, and maintains completeness of the metal ring without damage, so that the smart phone antenna is quite suitable for the modern mobile phone.

Description

technical field [0001] The invention relates to an antenna for a smart phone that is surrounded by a full metal ring, in particular to a 4G smart phone antenna with a full metal ring and narrow frame, and belongs to the technical field of wireless communication antennas. Background technique [0002] With the continuous development of communication systems from 1G to 4G, the frequency bands that modern smartphones need to cover also increase. To cover GSM850 / 900 / DCS / PCS / UMTS2100 / LTE2300 / 2500 working frequency bands, for commonly used built-in mobile phone antennas So many and wide frequency bands are always a big challenge. Although the system motherboards of modern smartphones are getting bigger and bigger, the chips and other modules with entertainment functions, such as cameras, MP3 and some sensors, occupy most of the space on the floor, leaving more space for antennas. Smaller and smaller, so miniaturization has always been a requirement for mobile phone antenna design...

AI Technical Summary

Problems solved by technology

However, in order to ensure the performance of the mobile phone antenna, the complete metal ring is generally disconnected through the gap, and a part of it is used as a part of the antenna, but this not only destroys the original metal ring's aesthetics and metal strength, but also makes the antenna Performance is difficult to guarantee when being held by hand

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