Abstarct: In this thesis, two new mechanical sensors with high sensitivity and low loss have been designed and introduced baxsed on groove gap waveguide technology. The first sensor is designed using an interferometric structure, where the use of interferometry enhances sensitivity and eliminates environmental effects such as temperature and humidity from the output results. In this sensor, the input path is initially split by a T-junction and then combined at the output. In one of the paths of the interferometer, a series stub and short circuit are used, creating a 180° phase difference. This phase difference nullifies two signals upon combination, resulting in transmission zeros in the frequency response. The position of these transmission zeros can be controlled by adjusting the physical or electrical length of this series stub branch. The second sensor utilizes two series stubs and short circuits arranged to provide bidirectional displacement capability in two dimensions. This configuration allows for movement in two dimensions. This thesis examines for the first time the effect of dielectric blades at the location of the short circuit branch in the groove gap waveguide structure, which alters the electrical length and shifts the position of transmission zeros. On average, in the first sensor, for every 0.5 millimeter of displacement and insertion of PTFE dielectric slabs into the short circuit branch, a shift of 50 MHz in the transmission zero frequency range from 10.4 GHz to 11.2 GHz is observed. In the second sensor, this displacement amounts to 65 MHz in both paths for every millimeter of dielectric slab insertion, within the range of 9.35 GHz to 11 GHz. The validation of the first sensor was confirmed through the fabrication and measurement processes, while the second sensor was validated through simulation. These sensors are scalable and suitable for use at higher frequencies.