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Coupling structure, resonator excitation structure and filter for coplanar-waveguide circuit

A coupling structure and resonator technology, applied in resonators, circuits, electrical components, etc., can solve the problems of resonant frequency variation of resonator 6, and achieve the effect of miniaturization and area saving

Inactive Publication Date: 2006-08-30
NTT DOCOMO INC
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Problems solved by technology

from Figure 5 It can be seen that the value of external Q can be adjusted by increasing the gap width g at the excitation line side, but at the same time the resonant frequency of the resonator 6 also changes

Method used

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  • Coupling structure, resonator excitation structure and filter for coplanar-waveguide circuit
  • Coupling structure, resonator excitation structure and filter for coplanar-waveguide circuit
  • Coupling structure, resonator excitation structure and filter for coplanar-waveguide circuit

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Embodiment Construction

[0042] Hereinafter, preferred embodiments of the present invention will be described.

[0043] Figure 6 It is a plan view showing the excitation structure of the first embodiment of the present invention. exist Figure 6 In (a), ground conductors 2 and 3 are arranged on both sides of the coplanar planar circuit 1, and the excitation line 4 as a signal input and output line is arranged at the central part of the coplanar planar circuit 1, so that the cut-off waveguide of the accommodating circuit substrate Unnecessary propagation patterns are not generated within. In addition, the end of the excitation line 4 is bent into an L-shape and short-circuited to the ground conductor 2, and the short-circuit line is close to and opposed to the current concentration part of the resonator 6 via a gap part having a width of α. An excitation part 5 as an inductive coupling part is formed. The external coupling strength is determined by the width α of the gap, the length β of the short...

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Abstract

Disclosed is a coupling structure for coupling to an arbitrary circuit in the coplanar plane circuit board having ground conductors arranged on both sides, the coupling structure equipped with the signal input / output line provided in the center of the coplanr plane circuit and an inductive coupling portion which is formed by short-circuiting one end of the signal input / output line to one of the ground conductor and opposed to a portion of the circuit portion through a gap.

Description

technical field [0001] The invention mainly relates to a coplanar circuit inner coupling structure, a resonator excitation structure and a filter used in a microwave / millimeter wave coplanar circuit. Background technique [0002] Conventionally, capacitive coupling in which the end of the excitation line is opened to approach the resonator, and inductive coupling in which the excitation line is directly connected to the resonator have been mainly used as the resonator excitation structure constituting the input / output portion of a coplanar planar circuit such as a filter. sexual coupling. [0003] figure 1 It is a plan view showing a conventional excitation structure using capacitive coupling (for example, refer to non-patent document 1), and the end of the excitation line 4 passing through the center of the coplanar planar circuit 1 is developed into a T-shape, separated in an open state. The elongated void portion faces a portion at one end of the resonator 6 that also d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P7/08
CPCH01P1/213H01P1/2013H01P1/20H01P7/08
Inventor 小泉大辅佐藤圭楢桥祥一
Owner NTT DOCOMO INC
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