CPW-fed oscillating microstrip antennas

Operating with a low-cost FET, oscillating CPW-fed microstrip antennas working at ~4 GHz have been presented. Because the design is based on slot or slot loop apertures, no via holes are required, These oscillating antennas are compact, easy to fabricate while providing uniform radiation patterns with cross-polarisation levels below -17 dB. Active integrated power combining arrays or active integrated phased arrays are possible future applications of these radiating elements