# AE1 shunt network series capacitor is not high Q low ESR ## Problem environment It's likely that a high quality series capacitor carries value in the RF path of an antenna. ## Steps to reproduce 1. Refer to the schematic 1. Locate AE1 and C99 1. Review capacitor quality ## Expected result The capacitor selected to populate C99 should be high quality, with a low ESR and high Q value. ## Actual result The C99 capacitor is a standard kind. ## Resources * https://www.arrow.com/en/products/06035j1r0bbstr/avx * https://www.digikey.com/en/products/detail/avx-corporation/06035J1R0BBSTR/1277325 ## Workaround Most high quality capacitors are maximum 0603 package sized, so order a small number of them and replace the 0805 standard part with a 0603 high quality one. Test for return loss and modify the design accordingly. ## Severity level This is **low priority** because project requirements do not specify radio performance.