FILTER CIRCUITS BASED ON NON-HOMOGENEOUS TRANSMISSION LINES
Keywords:non-uniform transmission line, wave impedance, filter circuit, characteristic impedance, zeros and poles of input impedance
One of the methods of constructing microwave filters is the method of characteristic parameters, in which a series capacitor is used as a filtering link with two sections of a uniform transmission line connected. In order to obtain different dependences of the characteristic frequency resistance, it is proposed to use lines with variable wave resistance instead of uniform lines. Meta stats - the designation of the injection of zeros and poles, spreading at the complex plane of the inlet, the support of a non-uniform line on the characteristic support of the filtering circuit. It is shown that by changing the impedance and capacitance, different frequency-dependent characteristic impedances can be obtained, which allows to increase the operating frequency range of filtering and matching circuits. To determine the wave resistance of non-uniform lines, it is proposed to use lines with a certain arrangement of zeros and poles of the input resistance. At the same time, the necessary wave resistance is formed by shifting the zeros and poles of the resistance of the loaded homogeneous line. The considered technique can be used to develop filters and matching devices for various frequency-dependentloads Examples of filters on symmetrical links, built by shifting the zero of the material input resistance of a loaded homogeneous line, are given.
Further research on how to induce filters and matching attachments with the use of the method of characteristic parameters in relation to the assigned infusion, the expansion of zeros and poles at the complex plane on the amplitude-frequency characteristics of the circuit in the filtering of the types of devices.
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