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Independently Controllable Pass-Band Dual-Passband Filter Based on Zero-degree Feed Structure

A dual passband filter and passband technology, applied in the filter field, can solve the problem that the filter cannot realize the passband bandwidth

Active Publication Date: 2021-11-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the filter can generate seven transmission zeros in the stopband, the filter cannot achieve independently controllable passband bandwidth due to the close distance between the embedded two pairs of half-wavelength resonators
[0006] At present, there are few reports in the literature on microstrip dual-band filters with compact size, high frequency selectivity and passband isolation, and independently controllable passbands.

Method used

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  • Independently Controllable Pass-Band Dual-Passband Filter Based on Zero-degree Feed Structure
  • Independently Controllable Pass-Band Dual-Passband Filter Based on Zero-degree Feed Structure
  • Independently Controllable Pass-Band Dual-Passband Filter Based on Zero-degree Feed Structure

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Embodiment Construction

[0026] The center frequency of the filter involved in the invention is 9GHz, the relative bandwidth is 5%, the return loss is better than 30dB, and the transmission zero point is located at 9.6GHz. According to the above indicators, the coupling coefficient of the filter (M 12 = M 23 =0.0637, M 13 =0.0425) and external quality factor (Q e =10.69) and specific physical dimensions.

[0027]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0028] The microstrip double-passband filter based on the zero-degree feed structure of the present invention operates at 2GHz and 3.5GHz, and its performance indicators include center frequency, relative bandwidth, return loss, transmission zero point position, and the like.

[0029] T...

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Abstract

The invention discloses an independently controllable microstrip double-passband filter based on a zero-degree feed structure. The whole structure includes two symmetrical terminal capacitively coupled first open-circuit stub-loaded dual-mode resonators 1 and second open-circuit stub-loaded dual-mode resonators 2, a λ / 2 stepped impedance resonator 3, and a λ / 2 uniform impedance Resonator 4, input circuit 5 and output circuit 6, wherein λ / 2 stepped impedance resonator 3 and λ / 2 uniform impedance resonator 4 are embedded in the first open-circuit stub-loaded dual-mode resonator 1 and the second open-circuit stub-loaded dual-mode inside of the resonator 2 to make the circuit compact.

Description

technical field [0001] The filter of the present invention relates to the fields of wireless communication and filter design, in particular to a filter design method that needs to be compatible with different communication standards and can support work in different frequency bands. Background technique [0002] In recent decades, with the development and evolution of 1G communication technology to 5G communication technology, a single communication device needs to be compatible with and support the work of multiple communication standards, such as GSM, WIFI, WiMAX, CDMA and LTE. In order to achieve this goal, the most conventional solution is that the radio frequency front end of the communication equipment is composed of multiple radio frequency circuits, each radio frequency circuit contains independent filters, amplifiers and other devices, with different center frequencies and bandwidths. Use RF switches to select filters with different center frequencies for communicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 崔晓冬徐军张帆张翊肖跃格
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA