| Summary: | 碩士 === 國立臺北大學 === 通訊工程研究所 === 104 === With the outbreak of technology, the circuit is getting smaller and smaller. Although the circuit is small, the function of circuit is more useful than before. In this paper, triplexer is composed of three filters. Each of them are at different center frequency. It means that filters are operated for different use. Size of this triplexer is only 47.5 mm * 23 mm. It is an important thing to place components of three bands in the limited place. Hence, order of filter must to be little. It is not easy to reduce the order of filter. Because the more orders, the better performance triplexer is. There are suitable number of components in the triplexer, all of them are enough to lay out in the limited place.
In the simulation, most of the components are the ideal. Components are not ideal in practice, both capacitors and inductors have parasitic effect in their module. Therefore, s2p file for capacitors replace the ideal capacitor in the schematic. Consequently, simulation will be as similar as measurement.
Trace between component and component also has the parasitic effect. But it is difficult to get the information of parasitic capacitor and inductor in the practice circuit. Assume that some parasitic components are in the circuit. Parasitic capacitors which connect to ground are about 0.05 pF in the long trace. Parasitic inductors are about 1.0 nH in the via. After assuming that in the simulation, it will be easy to tune the circuit in practice.
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