Convoluted elements on a frequency selective surface (FSS) allow for low frequency elements to be contained in physically smaller unit cells. Smaller unit cells give the FSS greater angular stability, especially where a curved FSS is required, and so unwanted grating effects are avoided. A convoluted element FSS with a frequency rejection band centred at 2 GHz and unit cell area of 15 mm by 15 mm (0.10 λ x 0.10 λ) has been developed. To test its usefulness, the full structure FSS is used as a parabolic reflector in a dual band FSS reflector antenna operating at 1 GHz and 2 GHz. Simulated and measured results are close at both bands. The reflector antenna has high gain at 2 GHz of 12.7 dBi (simulated) and 11.7 dBi (measured). To observe the angular stability of the FSS and therefore its effectiveness as a reflector, it was compared with a copper test reflector at both bands. Simulation of the reflector antenna with test reflector produced a 2 GHz gain of 13.3 dBi which is very close to that with the FSS reflector. The simulated 2 GHz gain plot of the reflector antenna with FSS reflector is very similar to that with the test reflector indicating that the FSS has good angular stability. The gain at 1 GHz is also high with 9.3 dBi (simulated) and 8.7 dBi (measured). Simulation of the reflector antenna with no FSS and only a rear test reflector produced a 1 GHz gain of 10 dBi which is very close to that with the FSS reflector in place indicating that the FSS causes no significant attenuation at that frequency. The convoluted element FSS would be useful as a curved reflector in the creation of high gain, multiband, conformal antennas.
A dual-band FSS (Frequency Selective Surface) reflector antenna that operates in the S-and L-bands with gains of 8 dBi and 11 dBi at 1 GHz and 2.5 GHz respectively is demonstrated. The antenna has been simulated successfully showing good results in CST MWS ® (Microwave Studio) EM (Electromagnetic) simulation software. The reflector antenna consists of a dual-band trap dipole antenna situated over an FSS upper parabolic reflector and a PEC (Perfect Electrical Conductor) lower parabolic reflector. The convoluted design of the FSS gives it angular and polarisation stability with a stopband centred at 2.5 GHz.
This paper investigates a method to enhance the radiation pattern of a Fabry -Perot cavity antenna (FPCA) through the use of frequency selective surfaces (FSS) to improve aperture phase distribution. Four FSS sheets were used as walls of a fully enclosed FPCA operating at 2 GHz. Electromagnetic rays at the edge of the FPCA incur a phase change when reflected off the FSS walls making the complete aperture phase distribution more uniform thereby increasing directivity. Simulations demonstrated that the phase correcting FSS walls significantly enhance the directive radiation properties of the FPCA. This includes a 2.1 dBi increase in peak directivity, and a 14.3 % reduction in 3 dB beamwidth (from 42° to 36°).
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