Which is precisely the same as a bridged T section with series element Z . The series half-section is thus a series impedance of 2Z . By corresponding reasoning, the shunt half-section is a shunt impedance of Z'( or twice the admittance ).
12.
There is a duplication of components in the "'lattice network "'as the " series impedances " ( instances of Za ) and " shunt impedances " ( instances of Zb ) both occur twice, an arrangement that offers increased flexibility to the circuit designer with a variety of responses achievable.
