  We develop an all electrical experiment to perform the broadband
phase-resolved spectroscopy of propagating spin waves in micrometer sized thin
magnetic stripes. The magnetostatic surface spin waves are excited and detected
by scaled down to 125 nm wide inductive antennas, which award ultra broadband
wavevector capability. The wavevector selection can be done by applying an
excitation frequency above the ferromagnetic resonance. Wavevector
demultiplexing is done at the spin wave detector thanks to the rotation of the
spin wave phase upon propagation. A simple model accounts for the main features
of the apparatus transfer functions. Our approach opens an avenue for the all
electrical study of wavevector-dependent spin wave properties including
dispersion spectra or non-reciprocal propagation.
