Advanced Butler Matrices With Integrated Bandpass Filter Functions

摘要: A novel class of Butler matrix with inherent bandpass filter (BPF) transfer functions is presented in this paper. The the fundamental network to split and recombine signal multi-port power amplifiers, however, suppress spurious frequencies generated by amplifiers or provide near-band rejection order not interfere other transmission/receiving bands separate filtering often required. Here, traditional division phase distribution are included together selectivity into one single device based only on coupled resonators. An analytical synthesis procedure coupling for ${\hbox{2}}^{k}\times {\hbox{2}}^{k}$ networks here first time. proposed solution has shown significant advantages terms size reduction compared baseline consisting a plus bank BPFs. design 2 $\times$ 2, 180 $^{\circ}$ hybrid coupler at 10 GHz 4 an equal-ripple four-pole Chebyshev characteristic centred 12.5 500-MHz bandwidth described, confirming technique proposed. Two models 4, built additive manufacturing milling, also compared. Experimental measurements good agreement both simulations theoretical expectations.