Abstract-A novel compact microstrip resonator based on interdigital structure is proposed. The resonator has several times higher quality factor than similar resonators presented earlier. It is shown that the size of the resonator can be significantly reduced with substantial increase in quality factor by incrementing the number of pins in the interdigital structure. A 4-pole bandpass filter with central frequency 900 MHz and an overall size 4.6 mm 10.0 mm was designed and fabricated on the base of the proposed structure. The measured upper stopband of the filter was found to be up to at the level 40 dB.Index Terms-Bandpass filter (BPF), interdigital resonator, microstrip, microstrip resonator.

where the symbol * T denotes the transpose of a matrix. To put it alternatively, the diagonal elements of [S] dictate the symmetry of the network, while the off-diagonal ones, the reciprocity of it. For the sake of completeness, we note that the passivity of the medium is determined by the negativeness of the matrix ½2r2½2r CT 2jABSTRACT: New quasi-lumped resonator bandpass filters with cross couplings are presented. Coaxial and suspended stripline structures are considered. These filters are notable for their extremely wide and deep upper stopbands at small dimensions. They also have transmission zeros near the passband that significantly improve frequency selectivity. Photographs and measured frequency responses for the four fabricated filters are presented.

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A multilayered, multi‐conductor stripline resonator is proposed. It is shown that increase in the number of conductors leads to increase the unloaded Q‐factor and decrease the resonant frequency, with increasing the effects for thinner dielectric interlayer. Application of the resonator to the bandpass filter enables designing bandpass filters with very wide and deep stopbands. To prove this, a 4‐pole bandpass filter, having central frequency 360 MHz and an overall size of 15.5 × 31.75 × 8.45 mm3, was designed and fabricated.

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