  Recent advancements in RF technologies, especially Internet of Things (IoT)
devices, require compact and integrated RF circulators or transmit-receive (TR)
switches for efficient resource use. Although conventional techniques are
crucial in managing signal flow to prevent signal interference to sensitive
receiver components, they have some drawbacks, such as limited isolation, low
switching speed, complex circuitry, bulkiness, and high cost. This work
presents a smart, miniaturized, nonlinear TR switch capable of operating over a
wide frequency range (0.8 - 1.3 GHz), making it suitable for IoT frequency
bands. The switch achieves high isolation, low insertion loss, and intelligent
transitions between transmitter and receiver without requiring external control
or bias pins.
