The microstrip narrowband filter contains a dielectric base, one side of which is metallized, and on the second side there is a signal conductor and two open loops galvanically connected to it, located on opposite sides of the signal conductor; wherein the length of one of the stubs is greater than the second – less than a quarter of the resonant wavelength, the wave impedances of the stubs are smaller than the wave impedance of the signal conductor, and the stubs are adjacent to two sections of the signal conductor with a wave impedance greater than the wave impedance of the rest of the signal conductor, and the sections of the signal conductor are made in length of a quarter of the resonant wavelength.
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