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A seven-pass band-pass filter

A filter and microstrip technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problem that the passband frequency cannot be designed to the usable frequency, and achieve optimized miniaturization and integration, controllable structure, and circuit saving area effect

Active Publication Date: 2020-10-16
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides a seven-band band-pass filter, the purpose of which is to solve the problem that the existing multi-band band-pass filter uses multiple Resonator integration leads to the technical problem that the passband frequency cannot be designed to a usable frequency

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  • A seven-pass band-pass filter
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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0028] figure 2 The structural representation of the multi-passband band-pass filter provided by the present invention, the multi-pass band band-pass filter comprises a T-shaped resonator, M upper branches and N lower branches; M upper branches are recorded as the first upper The branch, the second upper branch, ..., the Mth upper branch, and the N lower branches are recorded as the first lowe...

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Abstract

The invention discloses a multi-passband band-pass filter. Multi-passband can be realized, and the filter also has the characteristics of low insertion loss and compact structure. The filter comprises a T-shaped resonator of which the head end and the tail end are connected in parallel through a microstrip line, multiple upper branches and multiple lower branches so as to form a single resonator structure. Compared with the band-pass filter of which multiple resonators are mutually coupled, the resonant frequency is easier to adjust, and the passband can be effectively designed to the useful frequency band by changing the length of the microstrip line and the microstrip coupling space on the filter. The conventional source-load coupling structure is eliminated so that coupling can be reduced and the insertion loss can be reduced. Besides, the filter can be popularized to other frequency bands or the multi-passband band-pass filter of more passbands so as to have wide application prospect and practical value.

Description

technical field [0001] The invention belongs to the field of band-pass filters, and more specifically relates to a seven-pass band-pass filter. Background technique [0002] In recent years, wireless communication, as a medium of information dissemination, can be said to cover various fields. However, various fields, such as GSM, WLAN, 3G / 4G / 5G communications, etc., work in different frequency bands. At the same time, the development of miniaturization and integration requires radio frequency devices to support multiple frequency bands at the same time. In this context, the research on multi-frequency communication systems is particularly important. As an important component of communication systems, microwave filters play a vital role in channel selection, interference suppression, and noise attenuation. Therefore, bandpass filters with more frequency bands should be a development direction in the future. In recent years, for the design of multi-passband filters, there a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/20381
Inventor 毕晓君马强
Owner HUAZHONG UNIV OF SCI & TECH
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