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Broadband filter based on artificial local surface plasmons

A local surface plasmon and filter technology, applied to waveguide devices, electrical components, circuits, etc., can solve the problems of difficult compression length, unfavorable circuit miniaturization design, slenderness, etc., and achieve good group delay and well-balanced Effect of shape, compact circuit area

Inactive Publication Date: 2018-11-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most ideal bandwidth in the traditional microstrip filter is the step impedance line filter, but its shape is always very slender, and the length is difficult to compress, which is not conducive to the miniaturization design of the circuit

Method used

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  • Broadband filter based on artificial local surface plasmons
  • Broadband filter based on artificial local surface plasmons
  • Broadband filter based on artificial local surface plasmons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 of the present invention, the structure is as Figure 1-4 As shown, the upper dielectric substrate 4 and the lower dielectric substrate 6 are both 0.508mm thick Rogers RT5880 (prepreg) with a dielectric constant of 3.5, a dielectric loss angle of 0.004, and a thickness of 0.1mm. The microstrip excitation structure 1, the artificial localized surface plasmon 2 and the large-area metal ground 3 are all copper with a thickness of 0.018 mm. The parameters of the artificial localized surface plasmon structure in this embodiment are: r=2.5mm, R=10mm, N=32, a / d=0.6, that is, a=0.82mm, d=1.96mm; the microstrip excitation structure The parameter is: w 1 = 3.5mm, w 2 =0.2mm, l=12.5mm, s=3mm.

[0036] The simulation and test S parameter of embodiment one are as Figure 5 shown. The band-pass filter in the present embodiment, center frequency 4.3GHz, 3dB bandwidth 53% (3dB bandwidth is defined as S21 >-3dB corresponds to the frequency bandwidth divided by the cent...

Embodiment 2

[0038] In the second embodiment of the present invention, the materials and material thicknesses used are the same as those in the first embodiment. Among them, the structural parameters of artificial localized surface plasmons are: r=2.5mm, R=5mm, N=32, a / d=0.6; the structural parameters of microstrip excitation are: w 1 = 3.5mm, w 2 =0.2mm, l=7.5mm, s=2mm.

[0039] The simulation of embodiment two and test S parameter such as Figure 6 shown. The center frequency of the bandpass filter in this embodiment is 11.7GHz, and the 3dB bandwidth is 73%. (Tested S 21 The data is lower than the simulated value at high frequency, because the SMA connector used in the test has a low operating frequency and a large loss above 10GHz. ) The group delay in the passband of this filter is 1ns, and the initial edge of the parasitic passband is at 31GHz (about 3.6 times the center frequency).

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Abstract

The invention discloses a broadband filter based on artificial local surface plasmons. The uppermost layer of the filter is a microstrip excitation structure (1); an upper dielectric substrate (4) isdisposed under the microstrip excitation structure (1); the lowermost layer of the filter is a large-area metal ground (3); an underlying dielectric substrate (6) is arranged above the large-area metal ground (3); an artificial local surface plasmon (2) and a prepreg (5) are disposed between the upper dielectric substrate (4) and the underlying dielectric substrate (6). The center of the artificial local surface plasmon coincides with the center of the microstrip excitation structure. The broadband bandpass filter has a symmetrical shape and a compact size, and has considerable bandwidth, insertion loss and spurious band suppression; and broad application prospects are achieved in miniaturized and highly integrated microwave circuits and devices.

Description

technical field [0001] The invention relates to a broadband bandpass filter technology, which belongs to the technical fields of microwave and millimeter wave, communication, radar and integrated circuit. Background technique [0002] Filters are an essential type of device in microwave systems, and their performance has a crucial impact on the indicators of the entire microwave system. Bandpass filter is the most commonly used type of filter. Narrowband bandpass filters (relative bandwidth <20%) can be designed based on filter circuit synthesis methods, such as coupled line filters, coupled resonator filters, etc. Broadband bandpass filters are often based on multimode resonators, such as stepped impedance lines, stepped impedance resonant rings, etc., and introduce structural symmetry breaking to split degenerate modes, thereby further increasing bandwidth. The most ideal bandwidth in the traditional microstrip filter is the step impedance line filter, but its shape i...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 崔铁军张璇如鲍迪
Owner SOUTHEAST UNIV
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