Miniaturized controllable three-frequency filter based on open-circuit step impedance line loading
A step impedance and filter technology, applied in waveguide-type devices, circuits, resonators, etc., can solve the problems of difficult frequency and passband control, high cost, large size of multi-frequency filters, etc., to improve market competitiveness. , low cost, small size effect
Inactive Publication Date: 2013-07-03
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0006] Due to the defects of the existing design methods, the existing multi-frequency filters have disadvantages such as large size, high cost, and difficult control of frequency and passband.
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[0050] The structure of the three-pass band-pass filter of the miniaturized, highly selective, frequency-controllable center-loaded open-circuit step impedance line is as follows figure 1 As shown, the relevant dimensions and specifications are as follows figure 2 shown. The thickness of the dielectric substrate is 0.81mm, the relative permittivity is 3.38, and the loss tangent is 0.0027. Folding the resonator into an n-shaped structure and the filter into a center-symmetric structure can effectively reduce the size of the filter. from figure 2 The size parameters of each microstrip line of Zhongkan filter are as follows: L=25.4±0.2 mm, L 2 =15±0.2 mm, L 3 =23±0.2 mm, L 4 =21.3±0.2 mm, L 5 =8±0.2 mm, L 6 =14.2±0.2 mm, L 7 =23.5±0.2 mm, W 1 =1.92mm, W 2 =1±0.2 mm, W 3 =0.4±0.1 mm, W 4 =1±0.2mm, W 5 =0.4±0.1 mm, W 6 =0.4±0.1 mm, W 7 =1.4±0.2 mm, g 1 =0.2 mm, g 2 =0.3 mm, g 1 =0.9 mm. The overall size of this filter is 0.167λ g *0.24λ g , where λ g is the ...
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Abstract
The invention discloses a miniaturized controllable three-frequency filter based on open-circuit step impedance line loading. The miniaturized controllable three-frequency filter based on open-circuit step impedance line loading comprises an upper-layer micro-strip structure, a middle-layer dielectric substrate and a lower-layer grounding metal plate, wherein the upper-layer micro-strip structure is attached to the upper surface of the middle-layer dielectric substrate, and the lower-layer grounding metal plate is attached to the lower surface of the middle-layer dielectric substrate; the upper-layer micro-strip structure comprises a first feed line, a second feed line, a signal input end, a signal output end, a first resonator and a second resonator; the two resonators are arrayed into a centrosymmetric structure; and the first feed line and the second feed line are the same in structure and arrayed into a centrosymmetric structure, the first feed line is connected with the signal input end, the second feed line is connected with the signal output end, and coupling structures are formed between the first feed line and the first resonator, as well as between the second feed line and the second resonator respectively. The miniaturized controllable three-frequency filter based on open-circuit step impedance line loading disclosed by the invention has the advantages of being small in volume, high in selectivity, and convenient in controlling three centre frequencies.
Description
technical field [0001] The invention relates to a miniaturized three-band filter, in particular to a small volume, high selectivity, [0002] The three center frequencies are convenient to control, and can be applied to band-pass filters of multi-frequency communication systems in radio frequency front-end circuits. Background technique [0003] In today's society, with the rapid development of multi-system wireless communication and mobile communication technology, modern microwave and millimeter wave systems are rapidly developing in the direction of miniaturization, light weight, high reliability, multi-functionality and low cost. As a key component of the front-end of the RF system, the filter has also become a hot issue, and there is an extremely urgent need for a filter with miniaturization, multiple passbands, and high selectivity. [0004] At present, researchers at home and abroad have done a lot of research on radio frequency filters, and have achieved a lot of re...
Claims
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Login to View More IPC IPC(8): H01P1/203H01P7/08
Inventor 宁更新宁小娟韦岗高立
Owner SOUTH CHINA UNIV OF TECH