CN221151325U - Tunable thin film microstrip filter - Google Patents

Abstract

The utility model relates to the technical field of filters, and discloses a tunable thin-film microstrip filter which comprises a Port1, and a capacitor C1, a capacitor C3, a capacitor C5, a capacitor C7, a capacitor C9, a capacitor C7, a capacitor C5, a capacitor C3 and a capacitor C1 which are arranged on one side of the Port1, wherein a capacitor C2 is electrically connected between the capacitor C1 and the capacitor C3. This tunable thin film microstrip filter, through the Port1 all with electric capacity C1, electric capacity C3, electric capacity C5, electric capacity C7, electric capacity C9, electric capacity C7, electric capacity C5, electric capacity C3 and electric capacity C1's setting, can solve current filter when using, in its circuit that contains electric capacity and inductance, if electric capacity and inductance are parallelly connected, probably appear in a certain very little time quantum, the voltage of electric capacity rises gradually, and the electric current is but gradually reduced, the electric current of inductance is but gradually increased, the voltage of inductance is but gradually reduced, lead to resonant frequency increase's problem easily like this.

Description

Tunable thin film microstrip filter

Technical Field

The utility model relates to the technical field of filters, in particular to a tunable thin film microstrip filter.

Background

The filter is a filter circuit composed of a capacitor, an inductor and a resistor, and can effectively filter the frequency point of the specific frequency or the frequency outside the frequency point in the power line to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency.

However, when the conventional filter is used, in a circuit including a capacitor and an inductor, if the capacitor and the inductor are connected in parallel, the voltage of the capacitor gradually increases and the current gradually decreases, the current of the inductor gradually increases and the voltage of the inductor gradually decreases, which easily causes the resonant frequency to increase, thus reducing the practicality of the filter.

The microstrip filter is converted according to the chebyshev principle, is a standard chebyshev filter, adopts step impedance to further effectively reduce resonance frequency, and therefore, a tunable thin film microstrip filter is provided by a person skilled in the art to solve the problems in the background art.

Disclosure of utility model

The present utility model is directed to a tunable thin film microstrip filter, which solves the problems set forth in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The utility model provides a tunable thin film microstrip filter, includes Port1 and sets up in electric capacity C1, electric capacity C3, electric capacity C5, electric capacity C7, electric capacity C9, electric capacity C7, electric capacity C5, electric capacity C3 and electric capacity C1 of Port1 one side, electric connection has electric capacity C2 between electric capacity C1 and the electric capacity C3, electric connection has electric capacity C4 between electric capacity C3 and the electric capacity C5, electric connection has electric capacity C6 between electric capacity C5 and the electric capacity C7, electric connection has electric capacity C8 between electric capacity C7 and the electric capacity C9, electric connection has electric capacity C8 between electric capacity C9 and the electric capacity C7, electric connection has electric capacity C6 between electric capacity C5 and the electric capacity C3, electric connection has electric capacity C4 between electric capacity C3 and the electric capacity C1.

As still further aspects of the utility model: the Port1 is electrically connected with the capacitor C1, the capacitor C3, the capacitor C5, the capacitor C7, the capacitor C9, the capacitor C7, the capacitor C5, the capacitor C3 and the capacitor C1.

As still further aspects of the utility model: the induction coil L1 is electrically connected to the capacitor C2, the capacitor C4, the capacitor C6, the capacitor C8, the capacitor C6, the capacitor C4 and the capacitor C2.

Compared with the prior art, the utility model has the beneficial effects that:

1. According to the utility model, through the arrangement of the Port1, the capacitor C3, the capacitor C5, the capacitor C7, the capacitor C9, the capacitor C7, the capacitor C5, the capacitor C3 and the capacitor C1, the problems that when the conventional filter is used, if the capacitor and the inductor are connected in parallel, the voltage of the capacitor is gradually increased, the current is gradually reduced, the current of the inductor is gradually increased, and the voltage of the inductor is gradually reduced, so that the resonant frequency is easily increased in a circuit containing the capacitor and the inductor can be solved.

Drawings

FIG. 1 is a circuit diagram of a tunable thin film microstrip filter;

Fig. 2 is a diagram showing the structure of a resonant rod in a tunable thin-film microstrip filter.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, a tunable thin film microstrip filter includes a Port1, a capacitor C3, a capacitor C5, a capacitor C7, a capacitor C9, a capacitor C7, a capacitor C5, a capacitor C3 and a capacitor C1 disposed at one side of the Port1, a capacitor C2 electrically connected between the capacitor C1 and the capacitor C3, a capacitor C4 electrically connected between the capacitor C3 and the capacitor C5, a capacitor C6 electrically connected between the capacitor C5 and the capacitor C7, a capacitor C8 electrically connected between the capacitor C7 and the capacitor C9, and a capacitor C8 electrically connected between the capacitor C9 and the capacitor C7, electric connection has electric capacity C6 between electric capacity C7 and the electric capacity C5, electric connection has electric capacity C4 between electric capacity C5 and the electric capacity C3, electric connection has electric capacity C2 between electric capacity C3 and the electric capacity C1, port1 all with electric capacity C1, electric capacity C3, electric capacity C5, electric capacity C7, electric capacity C9, electric capacity C7, electric capacity C5, electric capacity C3 and electric capacity C1 electric connection, all electric connection has induction coil L1 in electric capacity C2, electric capacity C4, electric capacity C6, electric capacity C8, electric capacity C6, electric capacity C4 and the electric capacity C2, wherein carry out the frequency adjustment through the length of adjusting open end tuning post, be equivalent to changing the capacitance to ground in the chebyshev equivalent model.

The working principle of the utility model is as follows: the microstrip filter is converted according to the chebyshev principle, is a standard chebyshev filter, an equivalent circuit model is shown in figure 1, a grounding inductance is equivalent to a resonant rod of the microstrip filter according to the model shown in figure 1, loading refers to equivalent grounding capacitance, the resonant rod adopts step impedance, the resonant frequency is further effectively reduced, and finally the length of a tuning column at an open end is adjusted to perform frequency adjustment, which is equivalent to changing the capacitance to ground in the chebyshev equivalent model.

The foregoing description is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical solution of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (3)

1. The utility model provides a tunable film microstrip filter, includes Port1 and sets up in electric capacity C1, electric capacity C3, electric capacity C5, electric capacity C7, electric capacity C9, electric capacity C7, electric capacity C5, electric capacity C3 and electric capacity C1 of Port1 one side, its characterized in that: the capacitor is characterized in that a capacitor C2 is electrically connected between the capacitor C1 and the capacitor C3, a capacitor C4 is electrically connected between the capacitor C3 and the capacitor C5, a capacitor C6 is electrically connected between the capacitor C5 and the capacitor C7, a capacitor C8 is electrically connected between the capacitor C7 and the capacitor C9, a capacitor C8 is electrically connected between the capacitor C9 and the capacitor C7, a capacitor C6 is electrically connected between the capacitor C7 and the capacitor C5, a capacitor C4 is electrically connected between the capacitor C5 and the capacitor C3, and a capacitor C2 is electrically connected between the capacitor C3 and the capacitor C1.

2. A tunable thin film microstrip filter as in claim 1 wherein: the Port1 is electrically connected with the capacitor C1, the capacitor C3, the capacitor C5, the capacitor C7, the capacitor C9, the capacitor C7, the capacitor C5, the capacitor C3 and the capacitor C1.

3. A tunable thin film microstrip filter as in claim 1 wherein: the induction coil L1 is electrically connected to the capacitor C2, the capacitor C4, the capacitor C6, the capacitor C8, the capacitor C6, the capacitor C4 and the capacitor C2.