A high performance multiband BAW filter
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In this paper, a multi band filter using TFBAR is proposed for 4G/LTE IEEE standard at mobile front end terminal. Initial layout of FBAR is designed and analyzed in Coventorware software. The electromagnetic properties and equivalent circuit characteristics of proposed multi-band filter are studied using Advanced Design System, Agilent software. The filter works well for frequency range 2.3–2.4 and 1.97–2.24 GHz. In this research work, the effect of inserting passive elements i.e. inductor (L) and capacitor (C) either alone or both in series and shunt arms of equivalent circuit of filter are also studied. As a result of introducing LC components, the filter responses at different frequency range and converges the frequency response either narrow or wideband of the proposed filter. The measured insertion loss is better than − 2 dB and return loss is better than − 20 dB. The novelty of this work is designing of miniaturized multiband filter which can be deployed in future mobile RF front end terminal that not only cover upcoming frequency band but also cover present standard IEEE communication band.
KeywordsBAW filter FBAR LTE Multiband filter
This work was completed with support by NPMASS (National Program on Micro and Smart Systems), India for providing Coventoreware, Comsol and other useful electromagnetic solvers. The authors especially thank organization named as MANCEF, New Mexico, USA and Coventor Company for provision of using Coventoreware software.
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