Small artificial magnetic conductor backed log‐periodic microstrip patch antenna

An artificial magnetic conductor (AMC) backed reduced‐size log‐periodic microstrip patch antenna (LPMA) is presented. To maintain the broadband performance of the LPMA, the AMC ground plane was modified to exhibit a log‐periodic structure. Specifically, an AMC ground plane configuration was realised over 0.889 mm thick ε r = 10.2 Rogers 6010.2LM substrate for an LPMA printed over 1.524 mm thick ε r = 2.94 Rogers 6002 substrate. The AMC‐backed LPMA is measured to operate from 5.3 to 8 GHz with linearly polarised broadside radiation, performing with 21% reduced size as compared with a conventional LPMA designed over the identical substrate stack‐up.