SU1376140A1 - Microstrip filter - Google Patents

Abstract

The invention relates to radio engineering and provides for the expansion of an obstacle band by suppressing the second parasitic bandwidth. The microstrip filter is a diele. substrate 1, on one side of which a metal coating is applied, and on the other side are semi-wave strip resonators (SPR) 4, open at the ends and electromagnetically interconnected, and communication elements 3 with external circuits. The signal arriving at the communication element 3 interacts with the extreme RCC 4, is transmitted from it through other RR 4 to the latter, and then it enters the RDC 3. When choosing the length of the communication section between RR 4, exceeding half the RR length and selecting from a certain ratio, the second spurious bandwidth is suppressed. 2 Il. e

Description

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The invention relates to the field of radio engineering and can be used for frequency selection of microwave signals.

The aim of the invention is to expand the barrier bandwidth by suppressing the second parasitic bandwidth.

FIG. 1 shows the microstrip filter design; FIG. 2 is a view A of FIG. one.

The microstrip filter contains a dielectric substrate 1, one side of which has a metal coating 2. On the other side of the dielectric substrate 1, there are elements 3 of communication with external circuits and half-wave strip resonators 4 that are open at the ends and are electromagnetically coupled to each other in the area length

lj.g which is superior

half their length from the ratio

1- and determined

oh 7-0

18 1

- (5 + o, i6o) / h

R

where c is the width of a half-wave strip resonator 4;

thirty

35

S is the gap between adjacent half-wave strip resonators 4;

h is the thickness of the dielectric substrate 1. The microstrip filter works in the following way.

When a signal arrives at the coupling element 3, the signal interacts with the extreme half-wave strip resonator 4. Each half-wave strip d resonator 4 resonates if its resonator. The frequency coincides with the frequency of the incoming signal. Thanks

between them, the electromagnetic P in the frequency range corresponding to the first pass band of the microstrip filter, the signal is transmitted from the first half-wave strip resonator 4 to the last and goes to the communication element 3.

With this choice of length 1, there is no connection between the half-wave strip resonators 4 in the vicinity of the doubled average frequency of the first passband, i.e. the second spurious bandwidth is suppressed.

Claims (1)

Invention Formula A microstrip filter containing a dielectric substrate, metallized on one side, on the other side of which there are communication elements with external circuits and half-wave strip resonators open at the ends and electromagnetically connected with each other, in order to extend the obstacle band by suppressing the second parasitic band, the transmission, the half-wave strip resonators are connected in a region of length C6 exceeding half their length 1p and determined from the relation l. .o.7-0, Sl 1 ,, where co is the width of a half-wave strip resonator; S is the gap between adjacent half-wave strip resonators; h is the thickness of the dielectric substrate.