TM dual-mode balanced band-pass filter based on SIW (substrate integrated waveguide)

A balanced band and filter technology, applied in the field of filters, to achieve good wide-stop band suppression performance, high common-mode rejection capability, and high selectivity

Active Publication Date: 2019-02-12
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inevitable generation of high-order modes when using TM dual-mode or multi-mode design filters, one or more parasitic passbands appear not far from the passband. How to reduce the parasitic passband or make the parasitic passband Band far away from the center frequency is an important issue

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  • TM dual-mode balanced band-pass filter based on SIW (substrate integrated waveguide)
  • TM dual-mode balanced band-pass filter based on SIW (substrate integrated waveguide)
  • TM dual-mode balanced band-pass filter based on SIW (substrate integrated waveguide)

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0041] The balanced bandpass filter of the present invention is illustrated by taking a WLAN system operating at a center frequency of 5.2 GHz as an example, and its 3dB relative bandwidth is 4%.

[0042] Such as figure 1 As shown, a SIW-based TM dual-mode balanced bandpass filter includes a dielectric substrate 10, a metal plate 20, a dielectric substrate 2 30, a metal plate 2 40, and a dielectric substrate 3 arranged coaxially from top to bottom. 50.

[0043] Assuming that the center of each dielectric substrate or metal plate is taken as the origin, the direction passing through the origin and parallel to the side length of the bandpass filter is taken as the x-axis, and the direction passing through the origin and perpendicular to the x-axis is taken as the y-axis, a coordinate system is established. In this case, it i...

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Abstract

The invention discloses a TM dual-mode balanced band-pass filter based on SIW (substrate integrated waveguide). The band-pass filter comprises a first dielectric substrate, a first metal plate, a second dielectric substrate, a second metal plate and a third dielectric substrate which are sequentially and coaxially arranged from top to bottom, micro-strip lines are arranged on the first dielectricsubstrate and the third dielectric substrate, a first rectangular gap rotating anticlockwise by 38 degrees is formed in the first metal plate, the second dielectric substrate is provided with a metalthrough-hole array and two perturbation metal holes, and a second rectangular gap rotating clockwise by 38 degrees is formed in the second metal plate. According to the band-pass filter, two poles aregenerated in a pass band, a transmission zero is generated on each side of the pass band, and the band-pass filter has high selectivity. Besides, the position and the size of a coupling gap are designed, six modes near TM120 and TM210 modes are effectively inhibited, and good wide stop-band inhibition performance is achieved. Magnetic walls are formed in the middles of the micro-strip lines underexcitation of a common mode, and magnetic current cannot enter a resonant cavity through the coupling gap, so that high common mode rejection is achieved within a wide frequency band range.

Description

technical field [0001] The invention relates to a filter, in particular to an SIW-based TM dual-mode balanced band-pass filter. Background technique [0002] In modern wireless communication systems, balanced devices have received more and more attention, because balanced devices can effectively suppress environmental noise and system internal noise. The filter is an essential device for communication system equipment. Balanced bandpass filters can effectively suppress the noise generated in the environment and within the system, so they are widely used in modern wireless communication circuits. A new type of balanced band-pass filter with high selectivity, miniaturization and high common-mode rejection is an urgent demand in the market, and it is also an inevitable trend in the development of balanced band-pass filters. [0003] Substrate-integrated waveguide (SIW) technology has attracted more and more attention because of its advantages of miniaturization, easy integrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/212
CPCH01P1/212
Inventor 孙亮薛一凡刑思贝朱家明邓宏伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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