by Arun Agarwal, Kabita Agarwal and Gourav Misra
Original Research
Requirement of antenna is essential in communication to transfer signals for various application. Different frequency range like the WLAN, WiMax, Ku-band, K-band, Ka-band, etc. in the world of communication has its arrangement. Microwave and satellite communication need higher range of frequencies for operation. Here, we have modelled a multi-band micro strip antenna for Ka band (26.5GHz-40GHz). The modelled antenna is simulated in Computer Simulated Technology. We observed that VSWR of the proposed antenna is below 2dB in entire frequency range of 30.8 GHz to 39 GHz. The designed antenna is simulated and a return loss of -10db result is found out, which is in a range of 26.5GHz-40GHz.
American Journal of Electrical and Electronic Engineering. 2019, 7(2), 49-54. DOI: 10.12691/ajeee-7-2-5
Pub. Date: July 26, 2019
11344 Views1353 Downloads
by Yinsen Jia, Xinqi Tu, Wei Yan, Enrong Wang, Yang Zhao and Shuqing Ding
Original Research
UAVs have many functions in detection, fire protection, communication, etc. in modern life, but the complex electromagnetic environment has a very bad impact on the UAV communication link. In this paper, the BPSK modulation and demodulation method of the UAV downlink communication link was analysed. Some typical electromagnetic pulse models were established, including sinusoidal pulse, square wave pulse, triangular wave pulse, Gaussian noise, electric fast transient pulse and surge pulse. The amplitude of different electromagnetic pulses was analysed when UAV communication error rate achieve 5%. Furthermore, the influence on the transmission image quality via UAV downlink was analysed with different electromagnetic pulses, which will provide a theoretical basis for the anti-interference optimization design of UAV communication links in the future.
American Journal of Electrical and Electronic Engineering. 2019, 7(2), 42-48. DOI: 10.12691/ajeee-7-2-4
Pub. Date: July 26, 2019
10820 Views1215 Downloads3 Likes
by Xiao Lyu, Dan Lyu and Yuge Yang
Original Research
The power system is a complex nonlinear system composed of many dynamic components that interact with each other. Failure of any component in the system will have varying degrees of effects on the entire system. From the perspective of the fragility of complex systems, the brittleness factor model and brittleness correlation factor model of power systems are established in this paper, and a method to determine the brittleness chain of power network is proposed. The experimental results show that the model can realize the identification of the component failure of the potential excitation system and prevent effectively the occurrence of cascading failure, and verify the accuracy and validity of the model.
American Journal of Electrical and Electronic Engineering. 2019, 7(2), 38-41. DOI: 10.12691/ajeee-7-2-3
Pub. Date: July 24, 2019
7906 Views1283 Downloads
by Arun Agarwal, Kabita Agarwal, Sumanshu Agarwal and Gourav Misra
Original Research
Communication on the move has always been sought for its convenience. Today’s mobile communication refers to portable devices operated with battery. Wireless communications is the fastest growing segment of the communications industry. Cellular systems have experienced exponential growth over the last two decades. Future mobile communications focus on everything Wireless in one Device along with Ubiquitous Communication among People and Devices. 5G technology stands for fifth generation.5G network will provide high data rate ,low latency, high reliability energy saving, cost reduction, higher system capacity and massive device connectivity.5G wireless systems is built with five technologies Millimeter waves, small cell, Massive MIMO, Beam forming and Full duplex. Like previous generation 2G, 3G and 4G mobile networks 5G are the digital cellular networks.5G are using the millimeter wave (mm Wave) which provide the higher bandwidth (3-300 GHz).
American Journal of Electrical and Electronic Engineering. 2019, 7(2), 34-37. DOI: 10.12691/ajeee-7-2-2
Pub. Date: July 04, 2019
8900 Views1680 Downloads
by Jean-Pierre Pascal
Original Research
Dealing with electromagnetic catapults, using a simplified numerical approach discretizing the secondary into small parallelepipeds, we demonstrate that short secondary linear induction motors usually produce superimposed periodic force modulations (large ripple). The paper begins with analyzing force modulations in the simple case of an aluminum sheet moving at constant speed inside a stationary sinusoidal magnetic field. The second part extends the analysis to the motor case when both the magnetic field and the sheet are moving at different speeds with an algorithm controlling accelerations through the motor slip. The third part presents an application of the calculation method simulating vibrations of a suspended mass elastically linked to a launching aircraft. The paper concludes that the linear motor thrust is modulated at a variable frequency which depends upon the motor control strategy. The frequency of this modulation is the ratio of the speed difference, between the field velocity minus the motor velocity, divided by the motor pole pitch. The thrust modulation could induce strong vibrations on heavy parts, such as fuel tanks, suspended onto aircraft wings, when meeting their resonance frequency. It is demonstrated how this modulation is avoided completely when the secondary motor length is an exact multiple of the stator pole pitch.
American Journal of Electrical and Electronic Engineering. 2019, 7(2), 26-33. DOI: 10.12691/ajeee-7-2-1
Pub. Date: June 21, 2019
12320 Views1381 Downloads