Microstrip bandpass filter with sector open-circuit structure

A band-pass filter and fan-shaped technology, applied in the field of microwave/millimeter wave devices, can solve the problems of high processing technology requirements, increased filter length, unfavorable miniaturization of millimeter wave integrated circuits, etc.

A band-pass filter and fan-shaped technology, applied in the field of microwave/millimeter wave devices, can solve the problems of high processing technology requirements, increased filter length, unfavorable miniaturization of millimeter wave integrated circuits, etc.

CN101694899AInactive Publication Date: 2010-04-14UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Microstrip bandpass filter with sector open-circuit structure
  • Microstrip bandpass filter with sector open-circuit structure
  • Microstrip bandpass filter with sector open-circuit structure

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[0035]The design center frequency is 34GHz, and the microstrip bandpass filter with fan-shaped open circuit structure has good suppression to 30GHz. The entire microstrip bandpass filter structure is fabricated on Rogers’ polytetrafluoroethylene dielectric substrate Duriod5880, and the relative permittivity of the substrate ε r =2.22, substrate thickness d=0.254mm, filter circuit size is 2.3x3.67mm 2 (Dimensions of 50 ohm microstrip and waveguide to microstrip transition are not included). In order to facilitate assembly, the size of the substrate is expanded, such as Figure 5 shown. In order to test, the two ports of the filter adopt the microstrip-to-waveguide antipolar fin-line transition 5, assemble the dielectric substrate and the circuit into the cavity, and the signal is input and output from the waveguide through the microstrip-waveguide conversion 5. The simulation test results of the fan-shaped open circuit bandpass filter are as follows: Figure 6 As shown, the...

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Abstract

The invention relates to a microstrip bandpass filter with a sector open-circuit structure, belonging to the technical field of microwave / millimeter wave devices and relating to a microwave / millimeter wave integrated circuit. Based on a traditional parallel coupling microstrip line filter, the microstrip bandpass filter with the sector open-circuit structure adds two sections of sector open-circuit shunts; either sector open-circuited shunt is a one-fourth wavelength terminal open-circuit line with a sector-structure end terminal; and the start terminals of the two sections of sector open-circuit shunts are perpendicularly connected with a center point of an auxiliary microstrip line. The invention has the advantages of simple form, compact structure and high beyond-strip attenuation, not only can be used in a microwave / millimeter wave integrated circuit, but also can be used in a submillimeter wave band with higher frequency. Meanwhile, an input microstrip line and an output microstrip line of the microstrip bandpass filter with the sector open-circuit structure are on the same straight line, thereby facilitating the application in practical projects.

Description

technical field [0001] The invention belongs to the technical field of microwave / millimeter wave devices, relates to microwave / millimeter wave integrated circuits, in particular to a microstrip bandpass filter used in microwave / millimeter wave integrated circuits. Background technique [0002] The filter has a frequency selection function, passing the required frequency signal and suppressing the unwanted frequency signal. For the RF transceiver system, the filter is one of the widely used passive devices, and its performance will directly affect the performance of the entire system. With the increasing application of millimeter-wave technology in wireless communication and radar systems, the demand for millimeter-wave bandpass filters with small circuit size and simple fabrication is also increasing. Due to the convenience of microstrip in planar drawing and plate making, and easy integration with other circuits, microstrip bandpass filters have been widely used in the mil...

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Application Information

Patent Timeline
14 Apr 2010
Publication
CN101694899A
IPC
H01P1/203
Inventors
喻梦霞; 李桂萍