This paper presents a theoretical study of suppression of undesired higher‐order thickness modes excited in magnetostatic forward volume delay lines. This can be done by using the exciting and receiving transducers deposited directly on the top of an yttrium iron garnet film. Though this geometry has been used before, this paper describes more detailed investigation. Numerical results obtained are quite useful and encouraging. The magnetostatic volume wave delay lines have potential applications in microwave signal processing with larger operating bandwidth directly at microwave frequencies.