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The Internet of Things (IoT) aims at connecting a very large number of devices using an Internet-like architecture. Machine-to-machine (M2M) networks are considered the main component of the IoT. Long-term evolution (LTE) and LTE-advanced (LTE-A) are excellent candidates for supporting M2M communications due to their native IP connectivity and scalability for massive number of devices. Therefore,...
In this paper, we propose a SIW fed circularly polarized (CP) tapered slot antenna which have a good return loss and a wide band axial-ratio. The performance of the antenna has been extensively optimized based on both CST Microwave Studio and Ansoft-HFSS simulation to obtain wide band CP operation. In the following sections, we introduce the theory of operation, the details of the design and the measured...
In this paper, the authors proposed a technique to improve the gain, narrow the H-plane beamwidth, and minimize the phase center variations with frequency by utilizing Vivaldi antenna with a protruded dielectric rod. A sample antenna was fabricated and measured, and preliminary measured results are very promising, and in good agreement with the simulation results.
A compact Vivaldi antenna array printed on thick substrate and fed by a substrate integrated waveguide (SIW) structure is presented here. The array utilizes an SIW binary splitter to significantly minimize the feed structure insertion losses. Meanwhile, the splitter is fed with an integrated CPW to sustain a good input match and prevent higher order modes excitation over wide band operation. Extensive...
Two global optimization techniques, applicable for the optimization of several antennas and microwave components, are presented. The two techniques are explained together with a sample application, which is the optimization of an antipodal Vivaldi antenna. The first technique was found useful in optimizing the design aspects whose physical behavior is known, whereas the second was better for optimizing...
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