Design of Microstrip Hairpin Bandpass Filter for X-Band Radar Navigation

Today radar has broad benefits in many areas, for example in telecommunications and military or civil applications for navigation. An important component that can improve the performance of a radar system is the filter. The function of the filter is to pass the desired frequencies and block the unwanted frequencies. This study discussed the design and realization of a bandpass filter using microstrip technology with a hairpin structure working at some parameters, namely frequencies, bandwidth, insertion loss, return loss and VSWR. The filter was realized using a Rogers 5880 substrate with a relative dielectric constant value of two point two and substrate thickness of 1.58 mm. A simulation was carried out using the CST Suite Studio software application. In realization result show that, the middle frequency value of the filter is equal to the specification and simulation, but there are differences result between the simulation and the realization, in insertion loss, return loss, bandwidth and voltage standing wave ratio (VSWR) values.