Communication equipment and tunable microstrip filter

Abstract

The invention discloses a communication device and an adjustable microstrip filter, wherein the adjustable microstrip filter includes a dielectric substrate, at least a first microstrip line and a second microstrip line and a first switch element, and one side of the dielectric substrate The surface is provided with a grounded conductive layer, at least the first microstrip line and the second microstrip line are arranged on the other surface of the dielectric substrate facing away from the grounded conductive layer, and the two ends of the first microstrip line are respectively connected to the signal input terminal and the signal output terminal ; One end of the second microstrip line is connected between the input end and the output end, and the other end is the first electrical floating end, and the first switch element is coupled to the first preset position of the second microstrip line for controlling the second Whether the effective length of the microstrip line ends at a first preset position. Through the above method, the present invention can change the effective length of the second microstrip line under the action of the external control signal, and then make the filter output microwave signals of different frequencies, thereby changing the characteristic parameters of the filter.

Description

technical field [0001] The present application relates to the technical field of microwave transmission, and in particular, to a communication device and a tunable microstrip filter. Background technique [0002] Microstrip filters are usually used in radio frequency circuits, and are sometimes called microstrip line filters, which refer to filters built on microstrip lines. Typically, microstrip filters are fabricated on printed circuit boards. The microstrip line is a wire with a certain width. After the printing is completed, it means that the filter debugging is completed and can be put into use. At this time, the length, width and thickness of the microstrip line are fixed. [0003] Because the various parameters of the microstrip line are fixed, the parameters of the filter cannot be adjusted during use. Therefore, if the parameters of the filter need to be adjusted, it is necessary to reprint a new circuit board according to the change of the parameters. The producti...

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Problems solved by technology

[0003] Because the various parameters of the microstrip line are fixed, the parameters of the filter cannot be adjusted during use. Therefore, if you need to adjust the parameters of the filter, you need to reprint a new circuit board according to the changes in the parameters. The production process If you make a new printed circuit board, it will be very time-consuming and laborious, and the cost will increase accordingly

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