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Low pass filter for high frequency application

A low-pass filter, capacitor technology, applied in waveguide-type devices, impedance networks, electrical components, etc., can solve problems such as disappearance of effectiveness

Inactive Publication Date: 2004-11-10
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, beyond the target specific frequency band, its effectiveness disappears in another frequency band or another spurious signal characteristic may appear

Method used

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  • Low pass filter for high frequency application
  • Low pass filter for high frequency application
  • Low pass filter for high frequency application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] refer to Figure 4 , the low pass filter according to the preferred embodiment of the present invention is a circuit consisting of open-terminated microstrips 420, 440 and 460 and distributed resistances 421, 422, 441, 442, 461 and 462. Distributed resistors are inserted into open-terminated microstrips.

[0024] and figure 2 Compared with the conventional low-pass filter without resistors, the low-pass filter of the present invention has distributed resistors 421, 422, 441, 442, 461 and 462. Distributed resistance affects the spurious signal response of the low-pass filter. The effect of inserting resistors has a greater impact on impedance at higher frequency bands. This effect is insignificant in the passband of the low-pass filter, however, by amplifying the band it has a greater influence on the spurious behavior in the stopband.

[0025] Each of the open-terminated microstrips 420, 440, and 460 operates as a capacitor, wherein each of the open-terminated micr...

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PUM

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Abstract

The present invention relates to a lowpass filter for effectively suppress a spurious in stop-band. The lowpass filter includes an input port microstrip element; an output port microstrip element; a first open-ended microstrip element; a second open-ended microstrip element; a first connector microstrip element; and, a second connector microstrip element. The each open-ended microstrips of the present invention is composed of distributed elements and distributed resistances connected each others in series and operated as a capacity, has a large impedance of the microstrip by low influence of a resistance in case of a low frequency, and has a small impedance of the microstrip by high influence of a resistance value in case of a high frequency. The present invention can effectively suppress the spurious characteristic, which is a disadvantage of the conventional lowpass filter composed of transmission lines at the RF band or the microwave band, by inserting resistance elements in open-ended microstrips.

Description

technical field [0001] The present invention relates to a low-pass filter; more particularly, to a low-pass filter for effectively suppressing spurious signals in the stop band, which are generated by the filter in the band including the radio frequency (RF) band. or generated by operation in the high frequency band of the microwave band. Background technique [0002] Typically, conventional low-pass filters are constructed of transmission lines in radio frequency RF or microwave bands, and have spurious characteristics due to the periodic nature of the transmission lines in the stop band. [0003] refer to figure 1 and 2 , in a conventional low pass filter implemented using microstrips, the input port 210 and the output port 270 are microstrips having a characteristic impedance as the input / output port impedance. [0004] figure 1 The capacitors 120, 140 and 160 in the figure 2 The microstrips 220, 240, and 260 are implemented as open-circuite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203
CPCH01P1/2039H01P1/203
Inventor 李文揆柳根官廉仁福李圣八
Owner ELECTRONICS & TELECOMM RES INST