Design and simulation of high Q inductor for 2.4 GHz application
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Date
2019-06
Authors
Nabila Diyanah Binti Muhammad Rozi
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Abstract
In MMICs design there are two types of inductors that are commonly used which are spiral and meander inductors. Meander inductors become a priority when it is favourable to reduce the fabrication complexity. This is because it only requires one metal level of fabrication, which reduce the fabrication complexity and reduce eddy current losses. The effect of difference in ground structure to s-parameter, Q-factor and inductance are also a concern. The design of coplanar-to-meander transition was constructed and simulated using CST in order to study the performance of meander inductor for different ground structure transitioned meander at 2.4 GHz. The first step in the design is to construct the CPW conventional structure. Next, the design of CPWtransitioned meander inductor was done. The final step is to design another three different ground structure. A study on variation of ground-to-signal spacing proves that 35 µm is the best spacing. The percentage difference of the characteristics impedance is the lowest, making the impedance matching is much easier. The S11, S21, Q-factor and inductance analyses were performed on a 0.7 nH meander inductor transitioned with four different ground CPW which are the conventional, linear curvature, sharp edge and stepped edge. Conventional ground structure proves that it has the highest S11 compared to other ground structure. This is good in order to have more signal transmitted in a design. In terms of inductance and Q-factor, linear curvature has the highest value. As for the conclusion, the best structure is linear curvature, since it has the highest Q-factor and inductance value.