Browsing by Author "De Silva, U"

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    Implementation and testing of a switching circulator for twin-pair star radio architectures
    (IEEE, 2020-07) De Silva, U; Malavipathirana, H; Pulipati, S; Bhardwaj, S; Mandal, S; Madanayake, A; Weeraddana, C; Edussooriya, CUS; Abeysooriya, RP
    Realization of simultaneous transmit and receive (STAR) wireless systems is desirable for spectral efficiency but challenging due to difficulties in isolating the receiver from the transmitter. A twin-pair STAR architecture based on two identical sequentially-switched delay line (SSDL) circulators is proposed for STAR. The twin-pair approach uses one circulator as a real-time model of the other circulator which is used for communication, thereby allowing cancellation of transmit signals from the receiver before reaching the first low-noise amplifier (LNA). A wideband SSDL circulator is designed and characterized to study its suitability in the proposed STAR architecture. The circulator has spur-free (over-multiplexed) operation up to 48 MHz and under-multiplexed operation up to 1.0 GHz with an insertion loss < 10 dB and isolation > 25 dB.