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Double-frequency microstrip cross branch-line coupler

A branch line and coupler technology, applied in waveguide-type devices, circuits, connecting devices, etc., can solve the problems of small application range and large design size, and achieve the effect of large frequency ratio range, good amplitude balance, and flexible structural design.

Inactive Publication Date: 2016-07-20
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The present invention aims at the shortcomings of the dual-frequency branch line coupler in the prior art, such as small frequency ratio and large design size, etc. Dual-frequency branch line coupler with balanced amplitude, and each port achieves good matching

Method used

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  • Double-frequency microstrip cross branch-line coupler
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  • Double-frequency microstrip cross branch-line coupler

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Embodiment Construction

[0019] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0020] Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

[0021] combine figure 1 As shown, a dual-frequency microstrip cross-type branch line coupler is characterized in that it in...

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Abstract

The invention provides a double-frequency microstrip cross branch-line coupler comprising a base, and an input port, a direct-through output port, a coupling output port and an isolation port which are arranged on the base. The double-frequency microstrip cross branch-line coupler also comprises a first microstrip cross joint, a second microstrip cross joint, a third microstrip cross joint and a fourth microstrip cross joint. The first microstrip cross joint is connected between the input port and the direct-through output port. The second microstrip cross joint is connected between the direct-through output port and the coupling output port. The third microstrip cross joint is connected between the coupling output port and the isolation port. The fourth microstrip cross joint is connected between the isolation port and the input port. The conventional 1 / 4 wavelength impedance converter is replaced by a cross resonator model based on the conventional branch-line coupler structure, and the parameter values of corresponding elements are obtained through ABCD matrix analysis deduction and calculation so that port matching and port isolation can be realized, and the double-frequency microstrip cross branch-line coupler also has advantages of large frequency ratio range and small size.

Description

technical field [0001] The invention relates to the field of couplers in microwave communication, in particular to a double-frequency microstrip cross-shaped branch line coupler. Background technique [0002] With the rapid development of wireless communication technology, couplers, as an important part of passive devices in the field of wireless communication, have attracted more and more researchers' attention. Especially the application of dual-frequency devices is becoming more and more widespread, and many wireless communication standards are based on two or more frequency bands, so it is of great significance to study dual-frequency couplers. [0003] The branch line coupler has excellent isolation and good port matching, and is widely used in various microwave and radio frequency circuits. But for the traditional branch line coupler, its bandwidth is single, which is not suitable for dual-frequency communication system. The dual-frequency branch line coupler propose...

Claims

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Application Information

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IPC IPC(8): H01P5/12H01P5/16
CPCH01P5/12H01P5/16
Inventor 康炜林军张皓周恺
Owner NANJING UNIV OF SCI & TECH
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