In this article, an optimized E-shaped patch antenna for Bluetooth (2.4–2.484 GHz) and UWB (3.1–10.6 GHz) applications with WLAN (5.15–5.825 GHz) band-notched characteristics is proposed. The dimensions of the E-shaped antenna structure in addition to the position of the slotted C-shape in the ground plane are optimized using recent optimization techniques such as Modified Particle Swarm Optimi...

In the wireless communication applications, widespread usage of microstrip patch antennas due to their advantages such as compactness, easy fabrication and low cost, is pushed forward researchers develop desired or improve existing get one. But it challenging since have some disadvantages gain narrow bandwidth. this work, elliptical antenna designed for Bluetooth/Wi-Fi applications. The in form...

Objectives: To investigate the effect of comb-like slot dimensions on dualband microstrip antenna performance parameters. Methods: Alternate comblike slots are placed patch and varied to observe The design is simulated in Mentor Graphics software package. results verified with Finite Difference Time Domain (FDTD) analysis MATLAB. measured Vector Network Analyzer (VNA) good agreement results. Fi...

In this paper, we present a study on Aloha and Slotted Aloha protocols for Underwater Sensor Networks (UWSN). Such simple random access protocols allow sensor nodes to communicate in UWSN. We present a simple mathematical analysis as well as simulations to show the performance of Aloha and Slotted Aloha in the acoustic environment. Our results show that long propagation delay of acoustic signal...

Balloon angioplasty of ostial left anterior descending coronary artery (LAD) lesions has been associated with a high rate of acute complications and late restenosis. Recently, coronary stenting has been proposed as an effective treatment modality for ostial LAD lesions. To evaluate the effects of stent design on the development of late restenosis, we retrospectively analyzed the efficacy of slo...

Beam connections with reduced drilled section and slotted web have been presented after the Northridge earthquake (1994). Their new geometrical shapes have been resulted in weakening of beams and subsequently the bette rperformance of connections in the earthquakes. In this research, the advantages of both connections, mentioned above, have been studied in the Slotted Web Drilled Flange (SWDF) ...

Time Saving and energy consumption has become a vital issue that attracts the attention of researchers in Underwater Wireless Sensor Networks (UWSNs) fields. According to that, there is a strong need to improve MAC protocols performance in UWSNs, particularly enhancing the effectiveness of ALOHA Protocol. In this paper, a time-saving Aloha protocol with slotted carrier sense proposed which we c...