Abstract:
The non-reciprocal microwave components are essential parts of the majority microwave
communication, radar, and instrumentation systems as they provide shielding from high-power
reflected signals. Additionally, they simplify the fundamental task of dividing the broadcast and
receive channels in full-duplex radios. The bulky magnetically biased ferromagnetic materials are
typically used for their practical deployment. Therefore, current research trends are shifting
towards design & development of non-magnetic non-reciprocal microwave components.
In this thesis, the goal is to design & develop a frequency reconfigurable, non-reciprocal dual-band
bandpass filter (DBPF). In this context, a single-band frequency reconfigurable non-reciprocal
BPF is implemented on the sub-1 GHz frequency band (i.e., 900 MHz). Afterwards, a
reconfigurable DBPF is developed having 490 MHz as low frequency passband and 1200 MHz
high frequency passband. The non-reciprocal behavior in the proposed DBPF is achieved by using
the Spatio-temporal (STM) technique, through the Varactor diodes, in an attempt to avoid the use
of bulky ferromagnetic components like isolators and circulators, etc.
The proposed reconfigurable BPFs are attractive candidates for 5G wireless communication
systems, agriculture, and IoT-based networks.
