Dual passband radio frequency filter and communications device
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United States of America Patent
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Nov 21, 2017
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app pub date -
Apr 12, 2017
filing date -
Apr 15, 2016
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Abstract
Multi-band filters and communications devices are disclosed. A multi-band filter has a lower pass-band and an upper pass-band separated by an intervening stop-band. The multi-band filter includes a first ladder network and a second ladder network coupled in series. The first ladder network is configured to provide transmission zeros at frequencies below a lower edge of the lower pass-band and transmission zeros at frequencies above an upper edge of the upper pass-band. The second ladder network is configured to provide transmission zeros at frequencies within the intervening stop-band.
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