Spin waves (SW) are collective spin excitations in magnetically ordered materials. SWs oscillation frequencies are in the technological relevant microwave regime. Within this frequency regime SWs feature wavelength λ ≤ 1 μm. Spin waves with sub-100 nm wavelength could become the information carrier of future non charge-based information technology. Integrated microwave antennas on ferri- or ferromagnetic layer are used to excite the underlying magnetization dynamics. Depending on geometry a microwave antenna has a characteristic spatial profile of the microwave field. This provides a fixed set of wavevectors k = 2π/ λ that can be excited thus defining magnons of specific wavelengths.