Frequency discriminator design phase formula with experimental verification for frequency measurement systems with uniform sub-band resolution

In this letter, we propose a frequency discriminator design method with uniform frequency sub-bands. Frequency discriminators are designed using an interferometer projected with the proposed formulated phase. For experimental verification that a uniform sub-band is formed using the proposed phase formula, 3-bit frequency discriminators are designed and fabricated to operate in the 2-3 GHz and 2-4 GHz bands, respectively. The frequency discriminator consists of a power divider/combiner, reference line and delay line. RF characteristics of the frequency discriminators are analyzed using RF simulation and measurement results. RF characteristic results show that a 3-bit frequency discriminator designed using the proposed phase formula can identify an unknown signal inside the defined frequency band.Grant numbers : miniFIDS - Compact Sensor System for Unmanned Aerial Vehicles ( SfP 984809) project