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Miniaturized tunable bandstop filter

A filter and band modulation technique applied to signal filtering. , In the field of miniaturized adjustable band-stop filters, it can solve the problems of large size, small adjustable range of band-stop, and difficulty in applying DC, and achieve the effect of small size, large adjustable range of band-stop, and small insertion loss.

Inactive Publication Date: 2013-12-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies and defects of the above-mentioned prior art, the present invention proposes a miniaturized adjustable band-stop filter to overcome the large size of the existing adjustable band-stop filter based on the defects of the coplanar waveguide, and the band-stop Disadvantages such as small adjustable range and difficult application of DC bias

Method used

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  • Miniaturized tunable bandstop filter
  • Miniaturized tunable bandstop filter
  • Miniaturized tunable bandstop filter

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Embodiment Construction

[0016] The miniaturized adjustable band-stop filter proposed by the present invention, the front structure layout of an embodiment is as follows figure 1 As shown, its overall structure diagram is shown in figure 2 shown.

[0017] figure 1 and figure 2 The coplanar waveguide transmission line in is composed of a central conductor strip [1] on a dielectric layer [10] and grounding units [2] on both sides. The width of the notch formed by the central conductor strip [1] and the grounding units [2] on both sides is determined by the required characteristic impedance, and depends on the dielectric constant and thickness of the dielectric layer [10] and the width of the central conductor strip [1] . In this embodiment, the dielectric constant of the dielectric layer [10] is 9.6, the thickness is 0.8 mm, and the width of the central conductor strip [1] is 3 mm. In order to achieve a characteristic impedance of 50 ohms, the width of the notch is selected as 0 .8mm.

[0018] ...

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Abstract

The invention relates to a miniaturized tunable bandstop filter, which belongs to the technical field of microwave communication. The filter comprises three parts, i.e. a coplanar waveguide transmission line, a defected ground unit and realization of tunable bandstop, wherein the defected ground unit is formed by two square ring resonator structures etched on grounded units at two sides of the coplanar waveguide transmission line, and the tunable bandstop is realized through a variable capacitance diode across the outside square ring resonator structure and applied direct-current bias. The miniaturized tunable bandstop filter provided by the invention has the advantages of small size, simple structure, large internal inhibition in a stop band, large tuning range of bandstop, easiness in integration with other radio frequency circuits and the like.

Description

technical field [0001] The invention relates to a miniaturized adjustable band-stop filter, which belongs to the technical field of microwave communication and can be applied to signal filtering in ultra-wideband wireless communication systems and wideband radar systems. Background technique [0002] With the emergence of wireless communication systems such as GSM, WLAN, and UWB, the available spectrum is very limited. In order to improve the performance of existing and future wireless systems, adjustable band-stop filters have received extensive attention and are widely used in wireless communication systems. play an important role. For example, the emerging UWB technology requires a very wide frequency spectrum, but limited frequency spectrum resources are often used in multiple occasions, which means that there are a large number of unnecessary signals in the UWB wireless communication system, and the signal will change over time. and location changes may be constantly c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
Inventor 宁焕生汪俊何伟
Owner BEIHANG UNIV