Time-Domain Short-Pulse Feeding Network for Monopulse Antenna With High Fidelity

A monopulse feeding network is proposed for transmitting and receiving time-domain short pulse with high fidelity. The network consists of coplanar waveguides (CPWs), slotlines, microstrip lines, and transitions. Both the sum and the differential performances of the network depend mainly on the transverse structures of these transmission lines rather than their lengths, providing the capability of short-pulse transmission with high fidelity. Moreover, the normalized Euclid distance is employed to characterize and optimize the time-domain performance of the proposed network. A prototype is designed, fabricated, and measured, and linear phase response and stable transmission coefficient are achieved in ultrawide bandwidth. Time-domain performances are evaluated using an input differential Gaussian pulse, with a frequency spectrum of 4–12 GHz. The fidelity between input and output signals is over 0.96, and the amplitude of received signals is nearly the same, showing potential in short-pulse monopulse applications of the network.