Acoustic-wave devices in the microwave regime are pivotal to next-generation wireless communications, the Internet of Things, and burgeoning quantum technologies. Here, we present a lithium niobate on a silicon carbide (${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_3$-$\mathrm{on}$-$\mathrm{Si}\mathrm{C}$) ridge waveguide platform engineered to harness quasi-Love-mode surface acoustic waves with strong lateral confinement and low propagation loss. By leveraging the velocity mismatch between ${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_3$ and $\mathrm{Si}\mathrm{C}$, acoustic waves are steered efficiently along the ridge. To surmount persistent limitations in bandwidth (BW) and insertion loss (IL), we integrate single-phase unidirectional transducers (SPUDTs) and tapered waveguide structures. Experimental data reveal that, compared to conventional interdigital transducers, SPUDTs markedly extend the passband and lower IL, achieving a minimum of 2.81 dB. Further introducing taper structures reduces IL to 2.53 dB over a BW exceeding 150 MHz, all while preserving favorable propagation characteristics. In addition, we demonstrate bent waveguides and Y-shaped splitters that maintain robust performance, underscoring the quasi-Love-mode resilience to curvature. Altogether, this SPUDT-based ridge waveguide platform delivers low-loss, wideband acoustic-transmission lines poised for advanced phononic-integrated circuits, spanning both classical signal processing and hybrid quantum applications.

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• Acoustic phonons
• Piezoelectric devices
• Nanomechanical devices
• Thin films
• Waveguides
• Acoustic techniques
• Microwave techniques
• Surface acoustic wave