SU1215147A1 - Bandpass filter - Google Patents

Abstract

The invention relates to radio engineering and can be used in transceiver and measuring devices, increases selectivity. Dielectric resonators (DR) 1, forming a band-pass filter, are made in the form of a cube. placed on the grounding base 2 and placed in the shield 10. The PD has a mod mode communication element. The grounding base 2 is placed on one side of the dielectric substrate 3, and the input and output strip conductors (PP) 4 and 5 are located on the other side. PP 4 and 5 are connected with each other by a reactive coupling, for example, a gap 6, and with dielectric resonators - 1 - through the slits 7 and 8 in the grounding base 2. The middle of the slits 7 and 8 intersect the slit 9. Electromagnetic oscillation, which enters the PP 4, through slit 7 excites DP1. Due to inhomogeneities in the DP1 itself, degenerate vibrations are excited in it. The mode of this oscillation through slit 9 excites another DR 1. The mode of degenerate oscillation through slit 8 excites the output AC 5, the distance from the ends of AC 4.5 to the corresponding slit equals an odd number of wavelengths. 1 3.p, f-ly, 2 ill. i (L (Rig. 2

Description

The invention relates to a radio equipment and can be used in receiving and transmitting and measuring devices.

The aim of the invention is to increase selectivity.

Fig. 1 shows the design of the algae filter; and FIG. 2 shows a dielectric substrate on the side of a grounding base. YU

The band-pass filter contains two dielectric resonators 1, made in the form of a cube and equipped with mode coupling elements in it, for example, in the form of some kind of inhomogeneity (Figures 1 and 2 are not shown).

Dielectric resonators 1 are placed on the grounding base 2 located on one side of the dielectric substrate 3, on the other side of which the input and output strip conductors 4 and 5, respectively, are interconnected by a reactive 25 connection, for example, a gap Bis dielectric resonators 1 through the slots 7 and 8, made in the ground of the base 2 and placed perpendicular to the input and output strips 4 and 5, respectively, parallel to the edges of the electric resonators 1 - ary relation to their centers. The midpoints of slots 7 and 8 intersect with the third slot 9, while the distance from the ends of the input and output strip conductors 4 and 5 to the corresponding slot 7 and 8 is equal to an odd number of wavelengths.

Dielectric resonators 1 are placed in the screen W. I

Band-pass filter works as follows.

An electromagnetic oscillation is applied to the input strip conductor 4. Through the slit 7, the corresponding dielectric resonator 1 is excited. The plane of polarization of the oscillations excited 7, 50 perpendicular to the plane of FIG. Dielectric resonators 1 are made in the form of a cube, which ensures the equality of the resonant frequencies in degenerate (perpendicular) modes. 55 Due to inhomogeneities in the dielectric resonator 1 itself, V oscillates are excited in it.

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five

the polarization plane of the second mode of which is in the plane of FIG. 1. The third slit 9 connects the second oscillation mode of one dielectric resonator 1 with another dielectric resonator 1. Oscillations are excited in it, the plane of polarization of which coincides with the plane of Fig. 1. Due to the existing inhomogeneities are excited. degenerate oscillations, and the polarization plane of another mode is perpendicular to the plane of FIG. This mode, through slot 8, excites the output strip conductor 5. Distance 2 (n -) A / 4 from the ends of the input and output strip stripes 4 and 5 to slots 7 and 8 provides the best conditions for the connection of the dielectric resonators 1 with the input and output strip conductors 4 and 5, respectively. Screen 10 eliminates unwanted Electromagnetic coupling between dielectric resonators 1.

I

The proposed two-tier band pass filter is equivalent to a four-link with an additional link. Additional coupling is provided by a capacitive gap 6.

Claims (2)

1. A band-pass filter containing two dielectric resonators, an input and an output strip conductors, which are connected between the reactive coupling and are located on one side of the dielectric substrate, on the other side of which there is a grounding base, characterized in that In order to increase the selectivity, the dielectric resonators are made in the form of a cube, are equipped with mode coupling elements in them and are located on. a grounding base, in which two slots are additionally made, the electromagnetically connected correspondingly. with input and output strip conductors and arranged perpendicularly and parallel to the edges of the corresponding dielectric resonators symmetrically with respect to their centers, and a third slit intersecting the middle of two slits under an angle of 90 °. 2. The filter according to claim I, of which is Yu and y, so that the distance from the ends of the input and output strip conductors to the corresponding slot is equal to an odd number of lengths .