Asymmetric DGS (Defected Ground Structure) structure cascaded filter

An asymmetric and filter technology, applied to waveguide devices, electrical components, circuits, etc., can solve the problems of unsatisfactory S-parameter waveform shape, only a single point of suppression frequency point, and narrow bandwidth of suppression curve, etc., to improve microwave Power device performance, good effect, effect of suppressing higher harmonics

Inactive Publication Date: 2010-12-29
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0014] The technical problem to be solved by the present invention is that suppressing the harmonics formed due to the nonlinear characteristics of the circuit is a difficult problem in microwave circuit design. For the defective grounding structure in the existing microwave design field, or there is a suppression f

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  • Asymmetric DGS (Defected Ground Structure) structure cascaded filter
  • Asymmetric DGS (Defected Ground Structure) structure cascaded filter
  • Asymmetric DGS (Defected Ground Structure) structure cascaded filter

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Embodiment Construction

[0024] refer to figure 1 , figure 2 , which represents the schematic diagram of symmetrical DGS structure filters in the prior art. The higher harmonics of microwave power devices suppressed by these filters are limited to a single frequency point, and the application range is too narrow. 1 in the figure is a rectangle The dielectric plate has a side length of L, and a grounding panel 3 on its lower side, on which a figure 4 is etched, and a, b, d, and s on the figure are all geometric dimensions of the etched figure, and the middle part of the upper side is 50 ohm microstrip line 2, the width of the microstrip line is W, figure 2 It is a symmetrical T-type DGS structure filter, refer to image 3 It is a schematic diagram of an asymmetric T-shaped DGS structure. The asymmetrical characteristics in the figure are reflected in the fact that the distance from the etched part to the microstrip line is unequal, marked by unequal distances 11 and 12. The filter in the figure is ...

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Abstract

The invention relates to an asymmetric DGS (Defected Ground Structure) structure cascaded filter, belonging to the field of microwave devices. A T-shaped defected grounding structure asymmetric to a microstrip line is etched on a rectangular dielectric slab as an asymmetric T-shaped DGS structure of a single unit, and the asymmetric T-shaped DGS structures of two or three single units are cascaded in parallel to form the filter. Compared with the traditional dumbbell and T-shaped DGS structures, the asymmetric DGS structure filter can effectively inhibit secondary harmonic waves and third harmonic waves of the microwave devices in a specific frequency range, and the volume of the filter is not increased greatly. Multiple symmetric and asymmetric DGSs can be cascaded, and the cascaded product can obtain higher inhibition action on wide stopband of secondary harmonic waves and third harmonic waves of the microwave devices.

Description

technical field [0001] The invention belongs to the field of microwave components, and in particular relates to an asymmetrical DGS structure cascaded filter used in a communication system. Background technique [0002] In communication systems and electronic equipment, filters are widely used, especially in wireless communication systems and microwave equipment, it is one of the indispensable microwave components. Using the DGS structure (Defected Ground Structure, defined as "defective ground structure") to further define the filter also defines its structure and performance characteristics. The filter is the throat of the communication system. It can realize functions such as image elimination, harmonic suppression, parasitic filtering and channel selection. It can selectively allow signals with certain frequencies to pass through, suppress unnecessary frequency signals, and ensure accurate communication. No interference, safe and reliable electromagnetic environment and...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 张金玲吕英华李莉郑占奇杨金生
Owner BEIJING UNIV OF POSTS & TELECOMM
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