Microwave and RF filters are widely used in all kinds of systems like satellite television, civil and military radar systems, cellular radio, and etc. Particularly in our modern society, all the frequency bands are rapidly becoming occupied for different application purposes. Filters are even more important in order to discriminate the desired and undesired signal frequencies. In modern wireless communication systems, filters have particularly stringent requirements in both the base stations and mobile handsets.

In the thesis, we are going to design a Bluetooth band-pass filter which is targeting to the cell phone units. We are going to use IPD (Integrated Passive Device) technology to design a very small band-pass filter, and simulate the filter with the ADS (Advanced Design System) environment. The following chapters will introduces detailed information on how the specified filter was designed and simulated. The outside dimensions of the filter are scaled to just about 2mm by 2mm. With a high operating frequency, the performance of the band-pass filter is very sensitive to the value of those capacitors, inductors, as well as the ground routing. We are going to optimize the filter with the above factors, get the optimal value of each component and the optimal ground routing to get the best performance of the filter. We will also try to increase the Q-value of each component to improve the performance of the filter.