Electromagnetic waveguide systems are constructed to serve the purpose of directing and propagating electromagnetic waves along a designated trajectory. Such systems require specific structures. The proposed structure consists of two input lines and one output line. The first input line includes two waveguides of lengths \({\text{d}}_{0}\) and \({\text{d}}_{2}\) , grafted by a resonator of length \({\text{d}}_{1}\) . The theoretical analysis is based on the Transfer Matrix Method (TMM) to calculate the transmission and reflection rates. The main goal of this work is to propose a Y-shaped electromagnetic switch that can block electromagnetic waves from the first input to the output channel while allowing waves to transmit from the second input to the output channel within specific frequency ranges, depending on the precise geometrical parameters of the waveguides and resonator. This innovative structure has vast potential in various applications, such as switching across a wider frequency range with a high transmission rate, making it highly efficient and versatile.