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Ultra-wideband filter based on simplified left hand transmission line structure

A technology of ultra-wideband filter and left-handed transmission line, applied in waveguide devices, electrical components, circuits, etc., to achieve good out-of-band performance, low precision requirements, and small in-band insertion loss

Inactive Publication Date: 2008-08-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a big challenge to design an ultra-wideband bandpass filter with small size, good filtering performance, simple design method, and convenient fabrication.

Method used

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  • Ultra-wideband filter based on simplified left hand transmission line structure
  • Ultra-wideband filter based on simplified left hand transmission line structure
  • Ultra-wideband filter based on simplified left hand transmission line structure

Examples

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Embodiment 1

[0018] The technical solutions of the present invention will be described in detail through specific embodiments below in conjunction with the accompanying drawings. Example 1: first refer to Figure 1~2 The structure diagram of the UWB bandpass filter utilizing the simplified left-handed transmission line structure of the present invention is described.

[0019] The ultra-wideband filter utilizing a simplified left-handed transmission line structure in the present invention includes an input port 1, an output port 2 and at least one simplified left-handed transmission line structure unit on a PCB. The input end is connected to the first microstrip line structural unit through a 50-ohm microstrip line 3 , and the output end is connected to the last microstrip line structural unit through a 50-ohm microstrip line 4 . Each microstrip line structure unit is composed of series inductors, parallel capacitors and parallel inductors. The equivalent circuit model is shown in image ...

Embodiment 2

[0022] Embodiment 2: Referring to FIG. 8 , the grounded short microstrip line stubs of the filter of the present invention can have many different distribution forms. The grounded narrow microstrip transmission line can be distributed on the same side or above and below the main transmission line. It can be a straight line, a broken line, or other shapes. The curved segment of the zigzag type can be directed towards the input or towards the output. Other than that, the rest are the same as in Example 1.

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Abstract

The present invention relates to an ultra-wideband filter with simplified left hand transmit line structure which belongs to field of microwave communication equipment. The filter comprises of input port, output port and at least one microstrip transmission line structure cell on PCB board. Feeders of input port and output port are connected with the first and the last microstrip transmission line structure cell respectively by microstrip transmission line of 50 ohmic. Each microstrip transmission line structure cell can be equivalent to cascade of inductance in serial, capacitance in parallel and inductance in serial, wherein, the inductance in serial and capacitance in parallel can be realized by narrow microstrip transmission line and board microstrip transmission line, inductance in parallel is realized by narrow microstrip transmission line whose end passed the metal through hole to grounding. The filter of present invention has easy design, convenient production, small dimension and better out-band and in-band filtering capability.

Description

Technical field: [0001] The invention relates to an ultra-wideband band-pass filter using a simplified left-hand transmission line structure, belongs to the technical field of microwave communication equipment, and particularly relates to the design of an ultra-wideband microwave filter. Background technique: [0002] After the U.S. Federal Communications Commission (FCC) freed and opened the frequency band from 3.1GHz to 10.6GHz for applications in the communication field in 2002, ultra-wideband short-distance wireless communication has attracted great attention in the field of global communication technology. The filter is an indispensable and widely used passive device in the communication system, and it has become one of the research hotspots. Since the ultra-wideband filter is required to work in a relatively wide frequency band of 3.1GHz to 10.6GHz, and the filter is required to have a small size, traditional filter design methods cannot design such a wideband filter. ...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 韩文佳冯一军姜田徐晓非陈罡
Owner NANJING UNIV
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