Compact coplanar interferometer for a 5–6 GHz IFM system

Abstract

The authors present a new compact coplanar interferometer for application in an IFM system with 4 bits that operates in a frequency band from 5 to 6 GHz. This interferometer consists of a couple of coplanar two-way Wilkinson power dividers connected to two CPS lines with different signal delays. This interferometer presents smaller dimensions when compared to other designs. Details of this compact coplanar interferometer are provided along with a comparison between theoretical, simulated and measured results.

A novel method for frequency discriminators construction based on balanced gray code

“…From this method, a straightforward solution to implement a digital IFM is to attach microwave detectors along with voltage comparators [2,3]. If a certain detected signal's voltage level is higher than a predefined threshold, the output bit is '1' (or '0' otherwise).…”

A comparison between 4-bit fixed and reconfigurable microwave discriminators for frequency identification

“…This IFM implementation requires the following components on each of its branches: limiting amplifier, microwave discriminator, detector, amplifier and analogue to digital converter [1][2][3][4]. The design is compact compared to a fixed delay line implementation [5], resulting from the use of multiband-stop filters to produce the bits for frequency identification [4]. The filters are composed of rectangular microstrip open loop resonators, placed near a 50 Ω transmission line.…”

Frequency and angular estimations of detected microwave source using unmanned aerial vehicles

“…The unknown signal can be identified after it passes through frequency discriminators [6][7][8][9][10]. The signal is identified by a frequency sub-band defined by the circuit, where the unknown signal is allocated [8,10].…”

“…To identify the frequency of the unknown detected signal, the frequency band to be scanned is divided in sub-bands by using frequency discriminators [6][7]. The number of subbands of the system is determined by the number of bits used in the design [8].…”