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Planar Low-Pass Band-Pass Dual-Band Filter

A filter and passband technology, applied in the field of planar microstrip filters, can solve the problems of complex structure, increased filter design cost, large filter size, etc., and achieve good filtering characteristics, low insertion loss, and out-of-band selectivity Good results

Inactive Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The design method of the above achievements is to combine two band-pass filters with different frequencies, but the size of this filter is large and requires an additional connection network, the structure is more complicated and the design cost of the filter is increased.

Method used

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  • Planar Low-Pass Band-Pass Dual-Band Filter
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  • Planar Low-Pass Band-Pass Dual-Band Filter

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Embodiment

[0034] Such as Figure 4 Shown is a schematic diagram of an ideal transmission line model of a low-pass band-pass dual-frequency filter in the present invention. This embodiment discloses a planar low-pass band-pass dual-frequency filter, which is fabricated on a dielectric substrate in the form of a printed circuit board. On the same surface of the dielectric substrate, the input feeder head port1 for inputting electromagnetic wave signals, the output end feeder head port2 for outputting electromagnetic wave signals, the first transmission line 1, the second transmission line 2, the third transmission line 3, and the fourth transmission line are made respectively. 4. The fifth transmission line 5, the sixth transmission line 6, and the seventh transmission line 7. The other side of the dielectric substrate is a grounding plate.

[0035] In this embodiment, the dielectric substrate adopts a double-sided copper microstrip board, and the transmission line adopts a microstrip lin...

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Abstract

The invention discloses a planar low-pass band-pass dual-frequency filter, which is fabricated on a dielectric substrate in the form of a printed circuit board, and the same surface of the dielectric substrate is respectively fabricated with an input terminal feeder head port1 for inputting electromagnetic wave signals, Output feeder head port2 for outputting electromagnetic wave signals, first transmission line (1), second transmission line (2), third transmission line (3), fourth transmission line (4), fifth transmission line (5), sixth transmission line (6) The seventh transmission line (7), the other side of the dielectric substrate is a ground plate. The planar low-pass band-pass dual-band filter disclosed by the present invention can adjust the band-pass center frequency in a large range under the premise of ensuring that the low-pass characteristics remain unchanged. The filter is composed of an open-circuit transmission line and a high-impedance line. The length and characteristic impedance enable the band-pass center frequency to be independently adjusted within a wide range, and has the advantages of adjustable frequency, good selectivity, low loss, and simple structure.

Description

technical field [0001] The invention relates to the technical field of planar microstrip filters, in particular to a planar low-pass band-pass dual-frequency filter. Background technique [0002] With the rapid development of wireless communication technology, whether it is the popularity of 3G technology, the popularity of the Internet of Things or the arrival of 4G, it marks that wireless technology will usher in a peak period of vigorous development. In recent years, radio frequency / microwave communication systems that can work in two frequency bands at the same time have become a research hotspot, and microwave dual-frequency filters, as the key components of these communication systems, have also attracted more and more attention. Traditional dual-frequency filters have a general passband It is fixed, and sometimes it cannot meet the needs of wireless communication application systems for high-performance microwave dual-band filters. Therefore, it is of great significan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
Inventor 陈付昌吴文斌庄晓敏褚庆昕
Owner SOUTH CHINA UNIV OF TECH
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