Multiband antenna for mobile phone

Abstract

A multi-frequency antenna for mobile telephone is composed of a planar induction part consisting of the HF induction area and LF one and an extended induction part consisting of signal feed-in point,ground point and two extended circuits respectively connected with said HF and LF induction areas to form HF and LF antenna loops. Its advantages are wide bandwidth, and small size.

Description

technical field [0001] The invention relates to a multi-frequency mobile phone antenna, in particular to an antenna structure that has sufficient electromagnetic wave induction bandwidth and can maintain a small size, so as to be applied to dual-frequency or even triple-frequency mobile phone handsets. Background technique [0002] Due to the convenience of mobile phones in communication, mobile phones have become one of the necessary supplies in daily life. With the vigorous development of mobile phones, the design form of mobile phones has also been constantly refurbished and evolved to become thinner, smaller, more beautiful and multi-functional. Therefore, the antenna structure of the mobile phone has gradually adopted the planar antenna design form that can be hidden in the mobile phone case from the previous helical antenna design protruding outside the mobile phone case, so as to conform to the overall shape of the mobile phone. Lightweight and...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned planar antenna 3 already has sufficient bandwidth response when it is applied to transmit and receive dual-frequency electromagnetic wave signals of 900MHz and 1800MHz. When electromagnetic wave signals are used to form a so-called tri-band mobile phone, the bandwidth response of the high-frequency planar antenna 31 of the above-mentioned antenna 3 often cannot cover 1900MHz electromagnetic wave signals, making it unsatisfactory when transmitting and receiving 1900MHz electromagnetic wave signals. The frequency planar antenna 31 uses a quarter-wavelength resonance to transmit and receive electromagnetic signals, and the bandwidth it can provide is too small to effectively produce an ideal resonance strength at 1900 MHz. Therefore, the only solution is to make high-frequency The planar antenna 31 uses half-wavelength or full-wavelength resonance to increase the response bandwidth in order to effectively cover the 1900MHz electromagnetic wave signal, but this will double the required area of ​​the high-frequency planar antenna 31, resulting in the overall planar antenna 3 The size has been greatly increased, but a larger mobile phone case is required to accommodate it. The result is contrary to the design trend of thin and light mobile phones, which makes the design of tri-band mobile phones with hidden antennas a dilemma between signal transmission and reception performance and light and compact appearance. situation, resulting in a situation that cannot be considered in design

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