Designing Four Notched Bands Microstrip Antenna for UWB Applications, Assessed by Analytic Hierarchy Process Method

Abstract In this study, a novel microstrip fed Ultra Wideband (UWB) antenna is presented. The proposed antenna, with a size of 26×30×1.6mm3, is capable of removing four bands of interference in the coverage band. Firs, three filtered bands are created by cutting U, L, and C-shapes, a horizontal line on the patch, and fed line of antenna. The fourth notch is created by a new method that involves the use of a metalized via-hole and a C-shaped strip line in the rear side of the radiation patch. In the next step, the proposed antenna is compared with similar models with regard to different features such as size, bandwidth, and the number of the filtered frequency bands, in a new framework based on the Analytic Hierarchy Process. Thus, with a comprehensive comparison, the functional aspects of the proposed antenna are presented. The characteristics of the proposed antenna, such as radiation pattern, gain, and return loss (S11<-10dB), were measured; the correspondence between the simulated and measured results was acceptable

Mydan Mishan: A Newly Found Parthian Bas-Relief in the Alvand Range, Hamadan, Western Iran

Hamadan province in western Iran has always been of particular archaeological significance mainly because of its administrative centre Ecbatana, modern Hamadan. In 2005 a bas-relief dating to the Parthian period was found in the southern highlands of Alvand, in the Yakhchal valley. Recently, a second relief, very similar to the Yakhchal one, has been found at Mydan Mishan. This relief depicts a person lying on a klinè with his legs stretched out and resting his left elbow on a cushion. The figure holds a flowerlike object in his right hand and what looks like a goblet or a drinking bowl in his left hand. A comparison with other similar examples such as the relief of Heracles at Behistun and the Elymaean rock carvings of Tang-e Sarvak seems to suggest that the figure represented could be a Parthian high-ranking officer, a noble or a dignitary in a banqueting scene

A Compact UWB Monopole Antenna with Rejected WLAN Band using Split-Ring Resonator and Assessed by Analytic Hierarchy Process Method

Abstract The design of a compact microstrip line-fed Ultra-wideband (UWB) monopole antenna with a notched band characteristic is presented in this paper. The rejection frequency band occurs around 5-6 GHz, which is appropriate for wireless local area network (WLAN) applications and is obtained by a split-ring resonator on the antenna ground plane. The proposed antenna is printed on FR4 substrate material with a dielectric constant of 4.4. The dimension of the proposed antenna is 24×16×0.8 mm3. Radiating patch has a combined geometry realized by a half-circular ring and half-square ring. To achieve a proper impedance matching and increased bandwidth with VSWR ≤ 2, the study made use of an L-shaped element which was connected to the ground plane; moreover, the researchers added a split-ring resonator onto the ground plane to obtain one notched band. The comparison of the proposed antenna performance with previously presented UWB monopole antennas, was performed by using Analytic Hierarchy Process method. A good agreement was observed between simulated and experimental results