Microstrip dual-mode filter with features of wide stop band and low spurious
A low-spurity, filter technology, applied in the field of RF front-end, can solve problems such as deteriorating passband frequency response characteristics, deteriorating passband transmission characteristics, reducing filter bandwidth, etc., to improve response symmetry and reduce in-band insertion loss. , the effect of increasing spurious suppression and stopband width
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[0029] Example: a dual-mode microstrip bandpass filter based on a novel L-shaped coupling structure, the center frequency is 3.5GHz, the 3dB relative bandwidth is 20%, and the minimum insertion loss in the passband is 1.52dB.
[0030] The filter structure is as figure 1 shown. The dielectric substrate material used in the middle filter of this embodiment is TLX-8-0310 plate, the dielectric constant is 2.55, the tangent loss is 0.002, and the thickness is 0.7874mm. The measurement results of broadband transmission coefficient and broadband reflection coefficient of Example 1 are as follows: Figure 2 to Figure 3 shown.
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