Source: https://www.researchgate.net/profile/Vijay_Sharma67/publication/341186980_Assymetric_fed_compact_size_wide_slot_monopole_patch_antenna_for_S-band_X-band_Ku-band_application/links/5f807a8d299bf1b53e1b54ee/Assymetric-fed-compact-size-wide-slot-monopole-patch-antenna-for-S-band-X-band-Ku-band-application.pdf