A dual-gate phase conjugating antenna with ASK modulation capability for retrodirective communication links

New microstrip radiator feeding by electromagnetic coupling for circular polarization

“…Numerous advantages, such as their low profile, light weight, compactness and conformability, together with an easy manufacturing process, have contributed to their success in almost all commercial markets, in both civil and military areas [1][3] [4].…”

Printed quad-band CPW-fed slot antenna

“…With the appearance of modern wireless communication systems such as wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), Bluetooth, and long term evolution (LTE), attention has been centered in the design of compact, broadband, multiband antennas, with an omnidirectional radiation pattern, among other characteristics .…”