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Antenna tuning circuit and mobile terminal

An antenna tuning and circuit technology, applied in the field of electronics, can solve problems such as stray excess

Active Publication Date: 2020-03-10
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the third harmonic energy of the radio frequency signal reaches the third resonance of the antenna, these useless harmonic energy will be radiated out, resulting in excessive spurious

Method used

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  • Antenna tuning circuit and mobile terminal
  • Antenna tuning circuit and mobile terminal
  • Antenna tuning circuit and mobile terminal

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Embodiment Construction

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0021] The terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For exam...

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Abstract

The invention discloses an antenna tuning circuit and a mobile terminal. The antenna tuning circuit comprises an antenna, a first matching circuit, a second matching circuit, a first switch, a secondswitch, a radio frequency signal transceiver and a third switch, wherein the antenna comprises a first feeding point and a second feeding point; the first matching circuit and the first switch are connected between the first feeding point and the ground in series, and the second matching circuit and the second switch are connected between the second feeding point and the ground in series; the radio-frequency signal transceiver is connected to the third switch; when the working frequency band is in a low frequency, the third switch is switched to the first feeding point, a radio frequency signal transmitted by the radio frequency signal transceiver is transmitted to the antenna through the first feeding point, the first switch is disconnected, and the second switch is conducted, wherein thefrequency band in the third frequency band range is smaller than the frequency band in the second frequency band range. According to the embodiments of the invention, radiation stray can be inhibited.

Description

technical field [0001] The present application relates to the field of electronic technology, and in particular to an antenna tuning circuit and a mobile terminal. Background technique [0002] As a mandatory certification indicator for current electronic equipment (such as smart phones, etc.), radiation spurious is the most complicated and difficult problem among all certifications. Especially in the Global System for Mobile Communication (GSM) frequency band, because the power of GSM itself is high, it is easy to excite strong energy in an instant, resulting in excessive radiation of spurious harmonics. In actual engineering, it is mainly the third harmonic of GSM900, the second harmonic of GSM1800 or the third harmonic of GSM1800 exceeds the standard. [0003] For radio frequency signals, the signal we transmit will not only contain usable signals (such as GSM900), but also often contain components of the second harmonic (such as 1800GHz) or the third harmonic (such as 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q5/28H01Q5/328H01Q5/50H01Q1/50H01Q23/00H04B1/00
CPCH01Q1/50H01Q5/28H01Q5/328H01Q5/50H01Q23/00H04B1/006
Inventor 杨怀
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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