A slot line band pass filter formed on a dielectric substrate. In one
embodiment, the filter includes input and output positive and negative
signal conductors and resonators for coupling a signal of a desired
frequency between input and output conductors. Various resonator
arrangements are disclosed. In another embodiment, a filter having a
resonator connected to and disposed between positive and negative
conductors is taught. In yet other embodiments, filters having loop
resonators are disclosed.