Miniature Convoluted FSS for Gain Enhancement of a Multiband Antenna

Convoluted elements on a frequency selective surface (FSS) allow for low to be contained in physically smaller unit cells. Smaller cells give the FSS greater angular stability, especially where curved is required, and so unwanted grating effects are avoided. A convoluted element with rejection band centred at 2 GHz cell area of 15 mm by ( $0.10\,\,\lambda \times 0.10\,\,\lambda$ ) has been developed. To test its usefulness, full structure used as parabolic reflector dual antenna operating 1 GHz. Simulated measured results close both bands. The high gain 12.7 dBi (simulated) 11.7 (measured). observe stability therefore effectiveness reflector, it was compared copper Simulation produced 13.3 which very that reflector. simulated plot similar indicating good stability. also 9.3 8.7 no only rear 10 place causes significant attenuation frequency. would useful creation gain, multiband, conformal antennas.