Branch knot loading compact type microstrip filter

A microstrip filter, compact technology, applied in the direction of waveguide devices, electrical components, circuits, etc., can solve the problems of multiplier harmonic interference, large volume, large volume of open-circuit loading lines, etc., to achieve low return loss, Good effect of harmonic suppression

Inactive Publication Date: 2013-12-25
HUBEI UNIV OF ARTS & SCI
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  • Abstract
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Problems solved by technology

The obvious disadvantage of this structure is that it is bulky and has serious harmonic interference problems.
[0003] After searching the relevant literature, it was found that in 2003, L.Zhu et al. published the Compact Microstrip Bandpass Filter With Two Transmission Zeros Using a Stub Tapped Half Wavelength Line Resonator in the journal IEEE

Method used

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  • Branch knot loading compact type microstrip filter
  • Branch knot loading compact type microstrip filter

Examples

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Embodiment Construction

[0011] figure 1 , 2 Shown: a filter composed of a metal surface layer 1, a metal bottom layer 3, and a valence layer 2 in the middle. Metal lines with left and right symmetrical patterns are arranged on the metal surface layer 1, and the metal lines include left and right symmetrical " The Z" shape sets the bent input and output ports 4, the bent and connected source end and load loading transmission line 5, and the bent inward input and output coupling 6; it also includes the "T" set up and down in the middle cross structure The upper transmission line 7 is loaded in a shape open circuit, the lower transmission line 8 is loaded in a "T" shape open circuit, and the uniform transmission line resonant unit 9 with left and right parallel downward bending structures.

[0012] figure 2 Shown: The figure shows the S-parameters of the filter simulation design. It can be seen from the S11 curve that the return loss of the passband reaches more than 20dB, indicating that the filter...

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Abstract

The invention provides a branch knot loading compact type microstrip filter. Metal circuits with left-right symmetrical patterns are arranged on a metal surface layer. The metal circuits comprise bent input-output ports which are left-right symmetrical and arranged in a Z shape, source end and load loading transmission lines and input-output couplers which are inwardsafter bending. The source end and the loading transmission lines are connected in a bending mode. The branch knot loading compact type microstrip filter further comprises a T-shaped opening circuit loading upper transmission line, a T-shaped opening circuit loading lower transmission line and left-right-parallel even transmission line resonance units of a downward bent structure. The T-shaped opening circuit loading upper transmission line and the T-shaped opening circuit loading lower transmission line are located at a middle position and of a cross-shaped crossing structure and arranged vertically. The branch knot loading compact type microstrip filter solves the problem that a traditional microstrip filter is large in size, low in stop band restrain level and high in loss.

Description

technical field [0001] The invention relates to a compact low-loss microstrip filter, in particular to a branch-loaded compact microstrip filter. Background technique [0002] In microwave integrated circuits, microstrip is the most widely used transmission line, and its structure is convenient for external microwave solid devices. Microstrip patch resonators are widely used to design filters. A common microstrip filter structure is a uniform parallel line coupling structure. The obvious disadvantage of this structure is that it is bulky and has serious harmonic interference problems. [0003] After searching the relevant literature, it was found that in 2003, L.Zhu et al. published the Compact Microstrip Bandpass Filter With Two Transmission Zeros Using a Stub Tapped Half Wavelength Line Resonator in the journal IEEE Microwave and Wireless Components Letters. The method of uniform transmission line resonant cavity realizes the out-of-band limited transmission zero po...

Claims

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Application Information

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IPC IPC(8): H01P1/212
Inventor 李刚胡旭胡明华
Owner HUBEI UNIV OF ARTS & SCI
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