Design of a bandpass filter at K-band frequency / Nur Athiah Che Udin

Nowadays, the world telecommunication become more complex and need a high frequency in transferring the information. There are many new technologies have been developed in electronics communication such as Wireless Local Area Network and Bluetooth technology. The development in wireless communication systems has presented new challenges to design and produce high-quality miniature component. Therefore, many designers have recently received much attentions and been developed to reduce the volume and weight of communication circuits and equipments. Filters are essential component in the system for excellent operation of communication system and technology. Compact filter structures are available in demand for space-limited operations. It is known that there are many advantages in applications requiring a filter with features such as compact, low mass and low loss. Therefore, an edge coupled filter is designed to produce a compact, low mass and low loss filter. This thesis highlights the assembling of edge-coupled bandpass filter for radar application. The filter is design at K-band frequency that operates from 20 GHz to 20.3 GHz having a Chebyshev response. The filter is simulated by using Genesys design software and was implemented on Rogers 5870 substrate. The performance evaluation of the filter was compared between simulation and measurement results. Based on the experimental analysis from the project, it is observed that the shapes of both insertion loss and return loss are the same as in the theoretical. From the simulation, the value of Sl 1 gives about -37.8 dB, while it is recorded almost -30dB from the measurement analysis. S21 values gives about -4.102dB from the simulation results and -23. l 78dB from the measurement.