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A dielectric filter and balanced technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problem of insufficient suppression of filters in the high-frequency region of the stopband, and achieve insufficient improvement and common mode suppression. Effect
Inactive Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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The circular arc feed structure is adopted to excite the main mode TE in the differential mode state 01 mode, which is suppressed in the common-mode state; its common-mode rejection is improved, but the rejection of the filter in the high-frequency region of the stopband is not high enough
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[0029] refer to figure 1 and figure 2 , the HE of the present invention 11 A mode-balanced dielectric filter, including a first dielectric resonator 7 and a second dielectric resonator 14, a first tuning screw 8 and a second tuning screw 15, a first metal feed probe 3 coupled to a control port, a second metal Feed probe 6, third metal feed probe 10, fourth metal feed probe 13, first interface 2 for input and output, second interface 5, third interface 9, fourth interface 12, cavity The inter-coupling diaphragm structure 4, the coupling screw 11 for adjusting the coupling amount, and the metal shielding cavity 1 for accommodating the above-mentioned structure. in:
[0030] Above-mentioned first dielectric resonator 7 and second dielectric resonator 14 adopt dielectric material, and its dielectric constant is ε r =20, loss tangent angle tanδ=0.0002; such as figure 2 As shown, its height is 27mm, the outer diameter is 18mm, and the inner hole diameter is 9.4mm.
[0031] T...
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Abstract
The invention discloses an HE11 mode balanced dielectric filter, which comprises a first dielectric resonator 7, a second dielectric resonator 14, a first turning screw 8, a second tuning screw 15, a first metal feed probe 3, a second metal feed probe 6, a third metal feed probe 10, a fourth metal feed probe 13, a first interface 2, a second interface 5, a third interface 9, a fourth interface 12, an inter-cavity coupling diaphragm structure 4, a coupling screw 11 used for adjusting the coupling amount and a metal shielding cavity 1 used for accommodating the above structures, wherein the first metal feed probe 3, the second metal feed probe 6, the third metal feed probe 10 and the fourth metal feed probe 13 are used for controlling port coupling, and the first interface 2, the second interface 5, the third interface 9 and the fourth interface 12 are used for inputting and outputting The HE11 mode balanced dielectric filter has the advantages of high common-mode rejection degree, high out-of-band rejection, simple structure and the like, and mainly solves a technical problem that the existing balanced dielectric filter is low in common-mode rejection, great in loss and low in stop-band rejection.
Description
technical field [0001] The invention relates to the technical field of radio frequency communication filtering, in particular to a HE 11 Mode balanced dielectric filter. Background technique [0002] With the rapid development of mobile communication, communication spectrum resources are becoming more and more crowded, and communication systems often work in multiple frequency bands. The balanced filter, as a type of balanced circuit, can achieve filtering performance while suppressing internal active device noise and environmental noise; therefore, it has more prominent electromagnetic compatibility characteristics than a single-port unbalanced input / output circuit. Among the research results of balanced filters at home and abroad at this stage, PCB technology and LTCC balanced circuits have better effects, but the low Q value makes it impossible to apply to narrow-band systems; while the dielectric integrated waveguide has a high Q value, which can achieve less than 5% 3...
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