CST acquires CoupleFil software

CoupleFil is a synthesis tool for designing cross-coupled bandpass filters, and will complement and extend CST’s workflows for simulating and optimizing filters. Cross-coupled filters are commonly used for high-frequency, high-performance applications where narrow passbands and steep roll-off are required, for example in telecom base stations and satellites. Cross-couplings (couplings between non-adjacent resonators) can be used to modify the filter transfer function. They are mostly employed for improving the filter selectivity by producing transmission zeroes. Depending on their sign, they can also be employed for improving filter phase linearity. “Many of InnoDev’s customers are also CST customers, and will benefit from the integration of CoupleFil into CST’s software range,” said Rony Füglistaller, co-founder of InnoDev GmbH. “We look forward to working as part of the CST team in the future development of CoupleFil, and will continue to offer customer-specific software and hardware solutions.