Elastic Metamaterials are artificially engineered periodic structures which exhibit non-intuitive properties that can control the wave propagation and have recently gained much interest in the non-destructive evaluation (NDE) community. Ultrasonic guided waves are elastic waves propagating in extended structures such as plates, pipes, and rods. Guided ultrasonic waves are attractive for rapid inspection of infrastructural assets such as pipelines, pavements, and storage tanks. This is primarily because fundamental guided waves can propagate long distances from a single location and also have a through-thickness signature. However, each guided wave family consists of multiple modes differing in their sensitivity to defects position and nature. It is, therefore, a challenging task to filter out such additional guided ultrasonic wave modes. One of the possible ways to address this problem is by making use of elastic metamaterials. This research work demonstrates the existence of ultrasonic bandgaps in a ridged metamaterial that is implemented on a circular rod as an example of a new approach to isolate waveguide modes. The analysis of the approach and the design of various ridge parameters are performed using Finite Element simulations verified with experiments. This technique finds wide application in achieving extraordinary properties, including guiding, focusing, mode filtering, and trapping of ultrasonic wave modes in such geometries, which are increasingly essential to improved inspection and characterization of materials in engineering and biomedicine.