Low loss adjustable band-pass filter based on left hand characteristic

A filter and low-loss technology, applied in the field of low-loss tunable band-pass filters, can solve the problems affecting the application performance of left-handed materials, the difficulty of tunable left-handed materials, and the increase of structural complexity, achieving mature production technology and low price. , the effect of simple structure

Inactive Publication Date: 2009-08-05
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding an adjustable device will greatly increase the complexity of the structure, and liquid crystals are fluid and corrosive, which brings great difficulties to the practical application of adjustable left-handed materials.
In addition, left-handed materials with SRR structures use the overlap of electric resonance and magnetic resonance to achieve left-handed characteristics. Therefore, the high loss caused by resonance dispersion is an unavoidable problem for this type of left-handed materials, which seriously affects the application performance of left-handed materials.

Method used

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  • Low loss adjustable band-pass filter based on left hand characteristic
  • Low loss adjustable band-pass filter based on left hand characteristic
  • Low loss adjustable band-pass filter based on left hand characteristic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ba was prepared using standard solid-phase ceramic techniques 2 co 2 Fe 12 o 22 Ferrite substrate, the sintered ferrite is finely processed into a sheet sample with a size of 22mm×10mm×4mm, and Al with a size of 22mm×10mm×1mm is inserted between the two ferrites. 2 o 3 As a dielectric layer, its magnetic permeability is 1, magnetic loss is less than 0.0001, dielectric constant is 6, dielectric loss is 0.001, and resistivity is higher than 1×10 12 Ωcm, two ferrites and Al 2 o 3 The layers fit closely together to form a sandwich filter. The filter is loaded into a standard rectangular waveguide test, using figure 1 The method shown applies an external magnetic field to the filter, and uses a vector network analyzer to test its microwave filtering characteristics. The results obtained are as follows figure 2 shown. The obtained microwave passband width is about 1GHz, and the insertion loss can be as low as below 1dB. The operating frequency band of the microwave...

Embodiment 2

[0017] Ba was prepared using standard solid-phase ceramic techniques 2 co 2 Fe 12 o 22 Ferrite substrate, the sintered ferrite is finely processed into a sheet sample with a size of 22mm×10mm×4mm, and Teflon with a size of 22mm×10mm×2mm is inserted between the two ferrites as a dielectric layer. 1, the magnetic loss is less than 0.0001, the dielectric constant is 2.6, the dielectric loss is 0.0001, and the resistivity is higher than 1×10 12 Ωcm, two ferrites and Teflon layers are closely bonded to form a sandwich structure filter. The filter is loaded into a standard rectangular waveguide for testing, and its microwave filtering characteristics are obtained. The microwave passband width is about 1GHz, and the insertion loss can be as low as below 1dB. The working frequency band of the microwave passband increases with the increase of the external magnetic field strength, and the change law of the passband center frequency with the external magnetic field is as follows: im...

Embodiment 3

[0019] Ba was prepared using standard solid-phase ceramic techniques 2 co 1.6 Cu 0.4 Fe 12 o 22 Ferrite substrate, the sintered ferrite is finely processed into a sheet sample with a size of 22mm×10mm×4mm, and organic glass is inserted between the two ferrites as a dielectric layer. The magnetic permeability is 1 and the magnetic loss is less than 0.0001, the dielectric constant is 4, the dielectric loss is 0.01, and the resistivity is higher than 1×10 12 Ωcm, two ferrites and plexiglass are closely bonded to form a sandwich structure filter. Change the dielectric layer in the sandwich structure, use 22mm×10mm×0.1mm, 22mm×10mm×1mm, 22mm×10mm×2mm, 22mm×10mm×4mm plexiglass and ferrite layer to composite, and obtain a series of test samples, The microwave transmission properties of these samples were tested, and the results were as follows Figure 4 shown. As the thickness of the dielectric layer increases, the passband width of the filter decreases and the insertion loss ...

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Abstract

The invention relates to a low-loss adjustable band-pass filter based on characteristics of the left-handed, and belongs to the field of a microwave component. The low-loss adjustable band-pass filter has a sandwich structure of ferrite / dielectric / ferrite; the thickness ratio of the three layers is 1 to (0.01 to 3) to 1; the resonant coupling of the two ferrite layers can realize the microwave transmission band with the left-handed characteristics; an external magnetic field can be used for the real-time regulation and control of the working frequency range of the microwave transmission band;and the structural parameters can be changed to effectively adjust the width and the insertion loss of the transmission band. The adjustable band-pass filter has the advantage of ultra-low loss whichcan be as low as below 1 dB; the real-time regulation of the working frequency range of the microwave transmission band can be realized; and the width and the insertion loss of the transmission band depend on the structural parameters. The adjustable band-pass filter has the advantages of simple structure, convenient application, easy production and convenient maintenance.

Description

technical field [0001] The invention belongs to the field of microwave components, in particular to a low-loss adjustable band-pass filter realized by using left-handed characteristics. Background technique [0002] In 1968, the former Soviet scientist Veselago theoretically proposed a material with both negative permittivity and negative magnetic permeability. Since the electric field direction, magnetic field direction, and wave vector direction of electromagnetic waves in this material are in a left-handed coordinate system, this material is called a left-handed material (LHM). In 2000, Smith et al. in the United States used Metallic wires and Split-ring Resonator (SRR) arrays to manufacture the first left-handed material with negative refraction characteristics, which caused a huge shock in the international academic community. Utilizing the singular electromagnetic properties of left-handed materials can break through the physical limits of traditional media and realiz...

Claims

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Application Information

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IPC IPC(8): H01P1/215H01P1/218
Inventor 白洋徐芳张丽晖乔利杰李金许
Owner UNIV OF SCI & TECH BEIJING
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