Unlock instant, AI-driven research and patent intelligence for your innovation.

Frequency range adjustable antenna and frequency range adjustable antenna system and mobile terminal

An antenna system and frequency band technology, applied in the field of mobile terminals, can solve the problems of difficult antenna performance, changing antenna resonance, and insufficient bandwidth range, etc., to achieve the effect of realizing bandwidth

Inactive Publication Date: 2012-07-25
HUAQIN TECH CO LTD
View PDF6 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Especially when the CMMB antenna is used in the mobile terminal, because the bandwidth of the working frequency band of the CMMB antenna is very wide, that is, the CMMB antenna belongs to an ultra-wideband antenna, so in the capacitance-inductance matching circuit using a fixed capacitance-inductance value, the generated fixed frequency The bandwidth covered by the resonance is not enough, so the antenna resonance cannot be changed with the change of the working channel of the mobile terminal, so the resonance bandwidth of the antenna cannot cover the entire frequency band, so the antenna performance is often difficult to meet the standard

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Frequency range adjustable antenna and frequency range adjustable antenna system and mobile terminal
  • Frequency range adjustable antenna and frequency range adjustable antenna system and mobile terminal
  • Frequency range adjustable antenna and frequency range adjustable antenna system and mobile terminal

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0042] Such as figure 1 As shown, the frequency band adjustable antenna of this embodiment includes an antenna element 1 , a resonant circuit 2 , a second capacitor 3 and a third capacitor 4 .

[0043] The resonant circuit 2 includes a first inductor 21 , a first varactor 22 and a first capacitive element 23 . and if figure 1 As shown, the first inductance 21 in this embodiment is an inductance, the first varactor device 22 is a varactor diode, and the first capacitive element 23 is a capacitor. In addition, the first capacitive The element 23 can also use a capacitive variable element, such as a varactor diode or the like. Both the second capacitor 3 and the third capacitor 4 are capacitors.

[0044] Wherein the first inductor 21 is connected in series with the first varactor element 22 , and the first capacitive element 23 is connected in parallel with the first inductor 21 . The first varactor device 22 is connected to the antenna element 1 through the second capacitor ...

no. 2 example

[0053] Such as image 3 As shown, the difference between the frequency band adjustable antenna in this embodiment and the frequency band adjustable antenna in the first embodiment is that the resonant circuit 2 in this embodiment includes a first inductor 21, a first varactor device 22 and a The second inductor 24 . The first inductor 21 is connected in series with the first varactor element 22 , and the first varactor element 22 is connected in parallel with the second inductor 24 .

[0054] If the inductance value of the second inductor 24 in this embodiment is L 2 , the following resonance formula 2 can be obtained:

[0055] Z ( ω ) = jω L 2 + jω L 1 ( 1 jω C ...

no. 3 example

[0059] Such as Figure 4 As shown, the difference between the frequency band adjustable antenna in this embodiment and the frequency band adjustable antenna in the first embodiment is:

[0060] The resonant circuit 2 of this embodiment includes a first inductor 21 , a first varactor 22 , a third inductor 25 , a second varactor 26 and a third capacitor 27 . Both the first inductor 21 and the third inductor 25 are inductors, and the first varactor element 22 and the second varactor element 26 are both varactor diodes.

[0061] Wherein the first inductance 21 and the first varactor element 22 are connected in series, the second varactor element 26 is connected in series with the third capacitor 27, and the third capacitor 27 connected in series and the second varactor element 26 are connected in series with the The third inductor 25 is connected in parallel, the first varactor element 22 is grounded through the third inductor 25 , and the antenna element 1 is also grounded throu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a frequency range adjustable antenna which comprises an antenna element and a resonant circuit, wherein the antenna element is electrically connected with the resonant circuit, the resonant circuit comprises a first inductor and a first capacity-variable element with variable capacitance capacity, and the first inductor is serially connected with the first capacity-variable element. The invention also discloses a frequency range adjustable antenna system comprising the frequency range adjustable antenna, a frequency detection unit and a processor, wherein the frequency detection unit is used for detecting a communication frequency of a communication channel, and the processor is used for changing the capacitance capacity of the first capacity-variable element on the basis of the communication frequency detected by the frequency detection unit. The invention also discloses a mobile terminal using the frequency range adjustable antenna system. According to the frequency band adjustable antenna, the resonant frequency in the matched resonant circuit is changed through a capacitive element capable of changing the capacitance, thus bandwidth movement is realized. The frequency range adjustable antenna system adapts to the communication frequency of the communication channel through changing the resonant frequency.

Description

technical field [0001] The present invention relates to an antenna, an antenna system and a mobile terminal, in particular to an antenna with an adjustable frequency band as a CMMB (China Mobile Multimedia Broadcasting) antenna and an antenna system with an adjustable frequency band including the antenna, and an antenna system including the antenna System mobile terminal. Background technique [0002] At present, antennas in mobile terminals generally adopt two forms: external antennas or internal antennas, wherein the external antennas are generally telescopic antennas, but telescopic antennas greatly limit the appearance of mobile terminals. In addition, if a built-in antenna is used, a larger headroom area is required in the mobile terminal, and the requirement for stacking space of the mobile terminal is relatively high. [0003] Especially when the CMMB antenna is used in the mobile terminal, because the bandwidth of the working frequency band of the CMMB antenna is ve...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01Q23/00H01Q1/22
Inventor 张小荣
Owner HUAQIN TECH CO LTD