Bandpass filters that operate in the microwave spectrum play a crucial role in the realm of radio frequency, as they are instrumental in suppressing undesired signals outside the desired frequency range. This paper investigates the various design procedure of bandpass filters (BPFs) used in 5G communication systems, covering both mmWave and sub-6 GHz frequency bands. Within this examination, the study explores various aspects, including different designs of resonators and methodologies involving structures with defective ground. These aspects are thoroughly analyzed, as they are critical in shaping the performance characteristics of microwave bandpass filters used in wireless communication systems across different frequency bands. The core of the research focuses on the evaluation and comparison of three distinct bandpass filters obtained from an extensive review of literature. This evaluation involves a comprehensive assessment of key parameters, such as cut-off frequencies, high selectivity, low insertion loss, significant fractional bandwidth, and high return loss. The findings shed light on the crucial role played by resonator design and optimization, specifically tailored to the frequencies of interest. This optimization serves as a crucial element in enhancing the overall performance of microwave bandpass filter designs, making them highly practical for the advancement of wireless communication systems in today's dynamic and demanding landscape.