Abstract
This paper presents a simple microstrip transmission line based structure that exhibits λ/4 transmission line behavior at the operation frequency as shown analytically. It is also explained that resonance of the open-ended components can be applied to stop transmission at specific frequencies. Practical Butler Matrix is fabricated with the application of the network and consumed area has been reduced by 54% compared to classic realization. Furthermore, due to the implementation of open-ended components, upon measuring the performance the final setup exhibits the lowpass filtering behavior. The obtained results agree with the theoretical expectations. This paper proposes a solution for significant reduction in size and filtering combination of Butler Matrix for FR1 of 5G.