A Novel Fully Integrated 4-Bit IFM Subsystem Using Band-Stop Filters

Abstract

In this paper a 2-4 GHz microstrip IFM (Instantaneous Frequency Measurement) subsystem that uses Wilkinson power dividers, frequency discriminators based on band-stop filters and a DC arduino section is reported. The device uses band-stop filters as an alternative to delay lines, commonly used for IFM. The resonators are responsible for frequency adjustment, according to half guided wavelength resonator length, and the distance between the transmission line and the resonator. A fully micro-controlled 125 MHz resolution IFM subsystem is designed and tested. Results of the IFM subsystem composed by filters, 4-way power dividers and an Arduino board are described.

Review of microwave frequency measurement circuits

“…A 4-bit MFM subsystem based on band-stop filters connected to an Arduino board is presented in [60], 2015. The device shows the potential of producing micro-controlled low-cost MFM circuits with low weight.…”