Study on Optimization of Different Characteristics of Novel Shaped FSS
This paper deals with the simulated as well as measured results of a Frequency selective surface with perfectly conducting novel shaped elements. This frequency selective surface (FSS) acts like a single band-reject filter. The proposed design has been investigated theoretically using Ansoft Designer® software in which the reflection and transmission bands have been predicted by the method known as Method of Moment. Further experimental investigation is performed using standard microwave test bench. In comparison to the reference square patched Frequency Selective Surface (FSS) without slot, this FSS with novel design can provide size reduction up to 84.98%. Efforts have been given to achieve optimized value for different characteristics of FSS.
Experimental investigation of the frequency‐selective property of an array of dual‐tuned printed dipoles
The frequency‐selective property of an array of rectangular dipole microstrip patches resonant at dual frequencies (within the same frequency band) has been investigated experimentally. Measured data indicate a 40 dB separation between the transmission and reflection bands of the frequency‐selective surface (FSS) in the normalized transmitted electric field versus frequency plot. Experimental investigation of the FSS of an array of rectangular dipole microstrip patches resonant at a single frequency shows that the bandwidth of the reflection band is very narrow. In our present investigation, resonance at dual frequencies within the same frequency band has been used to broaden the bandwidth of the reflection band. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 31: 189–190, 2001.
Tests of composite beams with web holes
Tests of composite beams comprising a concrete slab supported on a steel deck and a steel wide-flange shape containing large web openings are described. Special attention is directed to the amount of shear connection between slab and steel section in the region of a web hole, and on the effect of construction loads acting on the steel section prior to composite action being effective.It is shown that limited shear connection at the hole will significantly affect the strength when loading produces a high shear-to-moment ratio, and a theory is presented which conservatively takes this into account. The effect of construction loads on unshored construction is shown to be small when these do not exceed 60% of the non-composite beam resistance at the hole.