Lan Baoshi substrate microstrip filter

Microstrip filter according to the present invention, Lan Baoshi substrate is provided, comprising Lan Baoshi substrate and a microstrip transmission line medium and the resonant structure unit made of a conductive material deposited on Lan Baoshi substrate medium. One end of microstrip transmission line is a signal input terminal, a signal output terminal and the other end. Resonant structure units interdigitated resonator structure, the number of which is at least on one side and a transmission line, resonant structure a plurality of units arranged in a line direction along the transmission line. No contact between any two resonant structure units between the resonator and the transmission line, and the structural unit. Side of the transmission line away from the resonant structure means is provided with at least one second material made of a conductive harmonic suppression unit. The present invention employs Lan Baoshi single crystal substrate made medium, to ensure stability of the filter can be miniaturized filters. The present invention is a structural unit and the resonance unit and the second harmonic suppression combined microstrip transmission line, adjustable bandwidth can be obtained, a large depth inhibition microstrip filter.