Miniature wide stop band dual-mode balance band-pass filter based on annular resonator
A ring resonator, wide stopband technology, applied in resonators, waveguide-type devices, circuits, etc., can solve problems such as difficulty in meeting the requirements of high-performance wireless communication systems, and achieve wide-band suppression effect, small size, and insertion loss. small effect
Inactive Publication Date: 2017-03-22
NANJING UNIV OF SCI & TECH
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[0004] At present, most of the disclosed balanced bandpass filters can only achieve one or some of the characteristics of miniaturization, high frequency selectivity, differential mode signal rejection bandwidth, and common mode signal rejection frequency bandwidth, which will be difficult to meet The growing demand for high-performance wireless communication systems
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[0036] combine Figure 3-5 , taking a ring resonator-based miniaturized wide stopband dual-mode balanced bandpass filter with a center frequency of 2.33GHz as an example, the dielectric substrate 10 used has a relative permittivity of 3.38, a thickness of 0.508mm, and a loss tangent of 0.0027 . Each size parameter of this balanced bandpass filter is as follows: the characteristic impedance of the first and second input end microstrip line conduction bands 11, 21 and the first and second output end microstrip line conduction bands 31, 41 is 50 ohms. Width is W 1 =1.05mm, the widths of the first and second input end microstrip coupling lines 12,22 and the first and second output end microstrip coupling lines 32,42 are W 2 =0.2mm, the width of the first microstrip stub 521, the second microstrip stub 522, the third microstrip stub 523, the fourth microstrip stub 524, the width of the four sides of the square resonance ring 51 Both are W 6 =1mm, the width of the fifth microstr...
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The invention discloses a miniature wide stop band dual-mode balance band-pass filter based on an annular resonator, and the band-pass filter comprises a dielectric substrate. A metal plate on one surface of the dielectric substrate serves as a metal grounding plate, and a metal plate on the other surface of the dielectric substrate is provided with a first input end feed line, a second input end feed line, a first output end feed line, a second output end feed line, a capacitor loading square resonant ring, a first infinitesimal disturbance stub, a second infinitesimal disturbance stub, a first microstrip coupling line and a second microstrip coupling line through etching. A capacitor loading structure and an infinitesimal disturbance unit are introduced in the annular resonator, thereby achieving the dual-mode, miniature and wide stop band balance band-pass filter. The band-pass filter is compact in circuit structure, is small in size, is high in frequency selectivity, is wide in different-mode signal stop band, is wide in common-mode signal inhibition bandwidth, and is very suitable for a miniature high-performance modern wireless communication system.
Description
technical field [0001] The invention belongs to the technical field of microwave passive devices, and in particular relates to a miniaturized wide stopband dual-mode balanced bandpass filter based on a ring resonator. Background technique [0002] In recent years, with the rapid development of mobile communication, wireless local area network, satellite communication, radar, and remote sensing technology, miniaturization requirements have been put forward for radio frequency microwave devices in communication systems. [0003] In the microwave filter industry, a dual-mode filter can be used as a double-tuned resonant circuit by introducing a dual-mode resonator, so for a filter with the same performance index, the number of resonators required is halved , so that the structure of the filter can be made more compact and the size smaller, and because of this, it is increasingly used in the design of modern wireless communication systems. Balanced bandpass filters can efficien...
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IPC IPC(8): H01P1/203H01P7/08
Inventor 顾辉王建朋葛磊许丽洁陆佳元
Owner NANJING UNIV OF SCI & TECH