scholarly journals Implementation of UAV Communication Channel Using Airborne Wide-Band Low-Element Antenna Arrays

2020 ◽  
Vol 6 (2) ◽  
pp. 39-44
Author(s):  
K. Korovin ◽  
S. Kuzmin

In this paper, we consider the the possibility of constructing a long-range communication link using a broadband low-element cylindrical antenna array based on Vivaldi antennas in 10 GHz band. A comparative analysis of the choice of emitters, optimization of the system according to the ratio of the number of elements and gain, and the assessment of overall characteristics are carried out. It is shown that the use of low-element cylindrical array allows one to obtain a compact antenna system with a gain of 13–16 dB, which allows one to construct a long-range communication channel.

YMER Digital ◽  
2021 ◽  
Vol 20 (12) ◽  
pp. 790-807
Author(s):  
N Parthiban ◽  
◽  
M Mohamed Ismail ◽  

Microstrip antenna is an essential choice for Ultra Wide Band (UWB) applications of its light weight, low profile and easy to form antenna arrays. However, the design of microstrip patch antenna bandwidth is greatly affects by the dielectric substrate material (FR4). In this research, the bandwidth enhancement of MPA was designed by minimizing the dimension of Defected GP (DGP) in GP for Ultra Wide Band wireless applications. But, the antenna design complexity increases with the number of an operating frequency band. In this research, the MPA was designed as small as size of 10×13×1.6 mm and operates on frequency band between 3.1GHz to 10.6GHz for VSWR less than 2. The microstrip patch antenna was designed at 3.1GHz to 10.6GHz using High-Frequency Structure Simulator (HFSS) software. The simulation result shows that the proposed microstrip patch antenna obtained <-10dB of return loss from 3.1GHz to 10.6GHz throughout the frequency range. The measured result proves that the proposed microstrip patch antenna has better characteristics to fulfill the requirements of UWB applications


Author(s):  
Ю.Г. Пастернак ◽  
В.А. Пендюрин ◽  
Ф.С. Сафонов

Печатные линзы Ротмана из-за своей достаточной простоты построения и за свои широкополосные свойства, а именно за счет коэффициента частотного перекрытия (может достигать 2-3 и даже более), являются одним из основных перспективных направлений для формирования лучей в многолучевых антенных решетках (МАР). Принцип работы таких линз основан на различных путях распространения волны внутри ее структуры, благодаря которому линза может работать в сверхширокой полосе частот. Но из-за этого возникает новая проблема, а именно: увеличение габаритных размеров антенной системы. Вследствие чего такую конструкцию очень сложно интегрировать в компактную систему приемопередатчика. Эту проблему предлагается решить путем разработки более компактной линзы Ротмана, сложенной пополам. Такой кардинальный метод изменения (уменьшения) габаритных размеров линзы Ротмана мы объясняем тем, что основным типом волны, переносящим подавляющую долю энергии, является волна ТЕМ, для которой практически отсутствует дисперсия в СВЧ-ламинатах с малыми потерями. А для радиолокации, радиопеленгации и связи нужны именно такие способы решения технических трудностей. Но перед тем как создать опытную модель или макет антенной решетки, необходимо провести ряд экспериментов, расчетов и подтвердить заданные технические характеристики ФАР. В данной работе была создана и посчитана математическая модель линзы Ротмана, основанная на том, что ее свернули пополам Rotman printed lenses are one of the main promising directions for ray formation in multipath antenna arrays (MAA) due to their sufficient simplicity of construction and their wide-band properties, namely, due to the frequency overlap coefficient (it can reach 2-3 or even more). The principle of operation of such lenses is based on different paths of wave propagation within its structure, thanks to which the lens can work with an extremely wide frequency band. However, because of this, a new problem arises - an increase in the overall dimensions of the antenna system. As a result, this design is very difficult to integrate into a compact transceiver system. This problem is proposed to be solved by developing a more compact Rotman lens folded in half. We explain this cardinal method of changing (reducing) the overall dimensions of the Rotman lens by the fact that the main type of wave that transfers the overwhelming share of energy is the TEM wave, for which there is practically no dispersion in microwave laminates with small losses. And for radar, radio direction finding and communication, these are the ways to solve technical difficulties. Before creating an experimental model or layout of the antenna array, it is necessary to conduct a number of experiments, calculations and confirm the specified technical characteristics of the PAA. In this paper, a mathematical model of the Rotman lens was created and calculated based on the fact that it was folded in half


2021 ◽  
Author(s):  
Parthiban N ◽  
Mohamed Ismail M

Abstract Microstrip antenna is an essential choice for Ultra Wide Band (UWB) applications of its light weight, low profile and easy to form antenna arrays. However, the design of microstrip patch antenna bandwidth is greatly affects by the dielectric substrate material (FR4). In this research, the bandwidth enhancement of MPA was designed by minimizing the dimension of Defected GP (DGP) in GP for Ultra Wide Band wireless applications. But, the antenna design complexity increases with the number of an operating frequency band. In this research, the MPA was designed as small as size of 10×13×1.6 mm and operates on frequency band between 3.1GHz to 10.6GHz for VSWR less than 2. The microstrip patch antenna was designed at 3.1GHz to 10.6GHz using High-Frequency Structure Simulator (HFSS) software. The simulation result shows that the proposed microstrip patch antenna obtained <-10dB of return loss from 3.1GHz to 10.6GHz throughout the frequency range. The measured result proves that the proposed microstrip patch antenna has better characteristics to fulfill the requirements of UWB applications.


2021 ◽  
Vol 11 (5) ◽  
pp. 2382
Author(s):  
Rongguo Song ◽  
Xiaoxiao Chen ◽  
Shaoqiu Jiang ◽  
Zelong Hu ◽  
Tianye Liu ◽  
...  

With the development of 5G, Internet of Things, and smart home technologies, miniaturized and compact multi-antenna systems and multiple-input multiple-output (MIMO) antenna arrays have attracted increasing attention. Reducing the coupling between antenna elements is essential to improving the performance of such MIMO antenna system. In this work, we proposed a graphene-assembled, as an alternative material rather than metal, film-based MIMO antenna array with high isolation for 5G application. The isolation of the antenna element is improved by a graphene assembly film (GAF) frequency selective surface and isolation strip. It is shown that the GAF antenna element operated at 3.5 GHz has the realized gain of 2.87 dBi. The addition of the decoupling structure improves the isolation of the MIMO antenna array to more than 10 dB and corrects the antenna radiation pattern and operating frequency. The isolation between antenna elements with an interval of 0.4λ is above 25 dB. All experimental results show that the GAF antenna and decoupling structure are efficient devices for 5G mobile communication.


2006 ◽  
Vol 54 (11) ◽  
pp. 3225-3238 ◽  
Author(s):  
Buon Kiong Lau ◽  
J.B. Andersen ◽  
G. Kristensson ◽  
A.F. Molisch

2012 ◽  
Vol 124 (920) ◽  
pp. 1090-1104 ◽  
Author(s):  
Brian C. Hicks ◽  
Nagini Paravastu-Dalal ◽  
Kenneth P. Stewart ◽  
William C. Erickson ◽  
Paul S. Ray ◽  
...  

Author(s):  
Ajai Prasad Thampi

Abstract: The basic idea of this project is to save the life of fishermen at sea. We do this by installing a module in the fisherman’s life jacket. This module will be a transmitter which can transmit its current location. This module is made to be a floating module. Which is also waterproof. The person in the dangerous situation can press the button and the transmitter starts transmitting the location. The data is then transferred to the receiver via a network built by WLAN module which is also made by us. The WLAN module consists of the transmitter and the receiver and acts as repeater stations. These transmitters and receivers also contain the LoRa module. The LoRa module is Incorporated because of its long range communication specifications. The repeater station is placed buoy the help of buoys. Buoys are floating objects which are then anchored to make them stationary. The receiver is a portable one and dynamically we can get the location of the transmitter. Hence we can locate the person and then rescue them Keywords: LoRa, WLAN, GPS module,


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