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Miniaturization coupler capable of adjusting coupling coefficients

A coupling coefficient and coupler technology, applied in the field of radio frequency couplers, can solve the problems of increased structural insertion loss, less coverage and weak coupling, and more adjustable components, and achieves the effect of reducing electrical length, achieving adjustable, and wide versatility.

Inactive Publication Date: 2018-02-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing couplers that adjust the coupling coefficient still have some disadvantages: (1) the circuit size is relatively large; (2) more adjustable elements are used, resulting in an increase in the insertion loss of the structure; (3) less coverage of weak coupling range (above 10dB)

Method used

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  • Miniaturization coupler capable of adjusting coupling coefficients
  • Miniaturization coupler capable of adjusting coupling coefficients
  • Miniaturization coupler capable of adjusting coupling coefficients

Examples

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Embodiment 1

[0029] In this embodiment, the size of the dielectric substrate is 60.5mm*48.0mm*0.76mm, and the dielectric constant of the dielectric substrate is 3.38. figure 1 The second microstrip line 2 has a length of 45.5mm and a width of 1.82mm, the third microstrip line 4 has a length of 5.8mm and a width of 0.48mm, and the fourth microstrip line 5 has a length of 11.6mm and a width of 0.48mm. mm; the value of series inductance 3 is 10nH, the value of varactor diode 7 is SMV1233 of Skyworks Company, the value of fixed inductance 6 is 3nH, the value of isolation capacitor 9 is 100pF, and the coupling coefficient is changed by adjusting the value of varactor diode 7.

[0030] The central frequency of the miniaturized adjustable coupling coefficient coupler of this embodiment is 1GHz, figure 2 , image 3 and Figure 4 Respectively, the S parameter response curves when the coupling coefficient is 9.0dB, 13.3dB and 18.4dB, Figure 5 is the measured output port phase difference under d...

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Abstract

The invention discloses a miniaturization coupler capable of adjusting coupling coefficients and belongs to the field of radio frequency couplers. The coupler comprises an upper layer micro belt structure, a middle layer medium base plate and lower layer grounding metal. The upper layer micro belt structure, the middle layer medium base plate and the lower layer grounding metal are up-down successively arranged. The upper layer micro belt structure comprises two mutually parallel first transmission lines and two mutually parallel second transmission lines and is symmetrical with respect to themiddle line of the two first transmission lines. The second transmission lines are arranged on two sides of the middle line of the first transmission lines. Two ends of each second transmission lineare vertically connected with the first transmission lines. Middle points of the second transmission lines are connected with one end of an adjustable electrical susceptance structure through isolation capacitors. According to the invention, the coupler is capable of adjusting coupling coefficients through the adjustable electrical susceptance structure, and by use of serially connected inductors,equivalent micro belt lines are formed, so the electrical length of the micro belt lines is reduced and the effect of achieving miniaturization is achieved.

Description

technical field [0001] The invention relates to the field of radio frequency couplers, in particular to a miniaturized coupler with adjustable coupling coefficient. Background technique [0002] With the rapid development of wireless communication technology, various communication services require radio frequency systems to work in different frequency bands and different modes. Especially in communication systems such as radar and electronic countermeasures, a reconfigurable RF front-end is required to meet the requirements of various modes of communication systems. The tunable coupler is one of the key components of the tunable RF front-end, which can be applied in the power detection of the circuit and the reconfigurability of the antenna array pattern. Many scholars have studied and designed frequency-tunable couplers of different structures, such as literature 1 (C.S.Kim, J.S.Park, D.Ahn, and J.B.Lim, "Variable directionalcoupler with LC resonator," Electron.Lett., Vol....

Claims

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Application Information

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IPC IPC(8): H01P5/04
CPCH01P5/04
Inventor 张天羽车文荃陈海东
Owner NANJING UNIV OF SCI & TECH
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