Double frequency band-pass filter based on double branch line loading stepped -impedance resonator
A stepped-impedance, dual-band pass technology, applied in waveguide-type devices, electrical components, circuits, etc., can solve the problems of large occupied volume and narrow bandwidth, and achieve the effects of low insertion loss, easy processing and good repeatability
Active Publication Date: 2013-01-09
SOUTHEAST UNIV
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Problems solved by technology
Since most WLAN systems support at least two standards at the same time in practical applications, such as IEEE 802.11b and IEEE 802.11a, this requires the system to have dual-band operating functions. Traditional dual-band filters, such as cascading a bandpass filter and a band-stop filter to achieve a dual-band band-pass filter, but occupies a large volume; or a resonator is embedded in another half-wavelength open-loop filter to obtain two pass-bands, but the bandwidth is relatively narrow
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Embodiment Construction
[0018] see figure 1 , which is a schematic structural diagram of a dual-band bandpass filter 10 based on a dual-branch loaded stepped impedance resonator of the present invention.
[0019] In this embodiment, the dual-band bandpass filter 10 is disposed on the substrate 20, the dual-band bandpass filter 10 includes a first input and output terminal 1, a second input and output terminal 2, and a first open-loop ladder impedance resonator 3 , the second open-loop stepped impedance resonator 4 , the first loaded double branch line 5 , the second loaded double branch line 6 , the first parallel coupled microstrip line 7 , and the second parallel coupled microstrip line 8 . Wherein, the first open-loop stepped impedance resonator 3 and the second open-loop stepped impedance resonator 4 are symmetrically arranged side by side, and the openings of the open loops are oppositely arranged, and a second open-loop stepped impedance resonator 3 is provided on the opposite side of the openi...
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The invention discloses a double frequency band-pass filter based on a double branch line loading stepped impedance resonator, relating to a double frequency band-pass filter based on a double branch line loading stepped impedance resonator, which can be used for wireless local area networks, wherein a first open-loop stepped impedance resonator (3) and a second open-loop stepped impedance resonator (4) are symmetrically arranged side by side; the open-loop openings are arranged in opposite direction; a first loading double branch line (5) is arranged at the opposite side of the opening in the first open-loop stepped impedance resonator (3); a second loading double branch line (6) is arranged at the opposite side of the opening in the second open-loop stepped impedance resonator (4); the first input and output end (1) is connected with the first open-loop stepped impedance resonator (3); the second input and output end (2) is connected with the second open-loop stepped impedance resonator (4); the upper sides and the lower sides of the first open-loop stepped impedance resonator (3) and the second open-loop stepped impedance resonator (4) are respectively provided with a first parallel coupling microstrip line (7) and a second parallel coupling microstrip line (8).
Description
technical field [0001] The invention relates to a microwave dual-frequency band-pass filter, in particular to a dual-frequency band-pass filter based on a double-branch loaded stepped impedance resonator that can be used in wireless local area networks. Background technique [0002] In recent years, with the rapid development of various modern wireless communication applications, especially the wireless local area network (WLAN) system developed in recent years, the demand for using multi-band equipment in microwave communication systems is also increasing sharply, becoming the front end of these communication systems The dual-band filter of the important device is one of them. Wireless local area network (WLAN) has several different communication standards, such as IEEE 802.11b, IEEE 802.11g, which work in the 2.4 or 2.45GHz frequency band respectively, while IEEE 802.11a works in the 5.2-5.8GHz frequency band. Since most WLAN systems support at least two standards at the ...
Claims
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IPC IPC(8): H01P1/203
Inventor 周健义朱晨洪伟
Owner SOUTHEAST UNIV