Optimization of RETRN loss parameter of feed network of turnstile antenna in LEO satellites application

2007 ◽  
Author(s):  
K. Keyghobad ◽  
J.M. Baabuei ◽  
T. Heydari
Keyword(s):  
Leo Satellites ◽  
Loss Parameter ◽  
Feed Network

scholarly journals Designing of a 2x2 E-shaped Microstrip Patch Grid Antenna

2021 ◽  
Vol 20 ◽  
pp. 123-127
Author(s):  
Juhi K. Baruah ◽  
Kandarpa Kumar Sarma ◽  
Sivaranjan Goswami
Keyword(s):  
Return Loss ◽  
Beam Width ◽  
Single Element ◽  
Patch Antennas ◽  
Gain Bandwidth ◽  
Microstrip Lines ◽  
Microstrip Patch ◽  
Loss Parameter ◽  
Feed Network ◽  
Simulation Results

In this work, a 2×2 grid of E-shaped patch antennas is proposed. The design of the grid is achieved through the design of a single element, the design of a 1×2 array and finally the design of the 2×2 grid on an FR4 epoxy substrate of thickness 1.5 mm. A corporate feed network of microstrip lines is used to excite the array. The performance of each stage is studied in terms of the return loss parameter, the far field gain, and the beam-widths are observed in each case from simulation results. The resonant frequency in each case is 3.8 GHz. It is observed that as the number of elements is increased, the beam-width reduces. In other words, the directivity is increased. Further, it is also observed that the gain and bandwidth is the minimum for the single patch, followed by that of the 1×2 array and the maximum for the 2×2 grid. Thus, the construction of the grid leads to increase in gain, bandwidth and directivity of the antenna.

scholarly journals 2x2 Grid Array Design with E-shaped Microstrip Elements

2021 ◽  
Vol 15 ◽  
pp. 1365-1370
Author(s):  
Juhi K. Baruah ◽  
Sivaranjan Goswami ◽  
Kandarpa Kumar Sarma ◽  
Nikos E. Mastorakis
Keyword(s):  
Return Loss ◽  
Beam Width ◽  
Microstrip Patch Antenna ◽  
Single Element ◽  
Gain Bandwidth ◽  
Microstrip Patch ◽  
Loss Parameter ◽  
Feed Network ◽  
Simulation Results ◽  
Element Array

The paper proposes a work of four element in a 2×2 grid fashioned with E-shaped microstrip patch antenna with corporate fed .The paper compares the proposed design with four elements with a single element and a 2 element array design.All the three antenna designs use E shaped microstrip patch as an element. The design of the grid is achieved through the design of a single element, the design of a 1×2 array and finally the design of the 2×2 grid on an FR4 epoxy substrate of thickness 1.5 mm. A corporate feed network of microstrip lines is used to excite the array. The performance of each stage is studied in terms of the return loss parameter, the far field gain, and the beam-widths are observed in each case from simulation results. The resonant frequency in each case is 3.8 GHz. Through comparision of simulation results the paper shows that as the number of elements is increased, the beam-width reduces. In other words, the directivity is increased. Further, it is also observed that the gain and bandwidth is the minimum for the single patch, followed by that of the 1×2 array and the maximum for the 2×2 grid. Thus,it is ssen that the proposed four element antenna with corporate feeding performs better as compared to antennas with either only single patch element or two element array. The construction of the grid leads to increase in gain, bandwidth and directivity of the antenna.

Distributed automation for back-feed network power restoration

2009 ◽  
Author(s):  
F. Mekic ◽  
Zhenyuan Wang ◽  
V. Donde ◽  
Fang Yang ◽  
J. Stoupis
Keyword(s):  
Feed Network ◽  
Power Restoration ◽  
Network Power

scholarly journals GNSS RTK Positioning Augmented with Large LEO Constellation

2019 ◽  
Vol 11 (3) ◽  
pp. 228 ◽  
Author(s):  
Xingxing Li ◽  
Hongbo Lv ◽  
Fujian Ma ◽  
Xin Li ◽  
Jinghui Liu ◽  
...  
Keyword(s):  
Low Earth Orbit ◽  
Global Navigation Satellite Systems ◽  
Convergence Time ◽  
Current Status ◽  
Initial Assessment ◽  
Satellite Systems ◽  
Long Baseline ◽  
Leo Satellites ◽  
Global Navigation Satellite ◽  
Long Baselines

It is widely known that in real-time kinematic (RTK) solution, the convergence and ambiguity-fixed speeds are critical requirements to achieve centimeter-level positioning, especially in medium-to-long baselines. Recently, the current status of the global navigation satellite systems (GNSS) can be improved by employing low earth orbit (LEO) satellites. In this study, an initial assessment is applied for LEO constellations augmented GNSS RTK positioning, where four designed LEO constellations with different satellite numbers, as well as the nominal GPS constellation, are simulated and adopted for analysis. In terms of aforementioned constellations solutions, the statistical results of a 68.7-km baseline show that when introducing 60, 96, 192, and 288 polar-orbiting LEO constellations, the RTK convergence time can be shortened from 4.94 to 2.73, 1.47, 0.92, and 0.73 min, respectively. In addition, the average time to first fix (TTFF) can be decreased from 7.28 to 3.33, 2.38, 1.22, and 0.87 min, respectively. Meanwhile, further improvements could be satisfied in several elements such as corresponding fixing ratio, number of visible satellites, position dilution of precision (PDOP) and baseline solution precision. Furthermore, the performance of the combined GPS/LEO RTK is evaluated over various-length baselines, based on convergence time and TTFF. The research findings show that the medium-to-long baseline schemes confirm that LEO satellites do helpfully obtain faster convergence and fixing, especially in the case of long baselines, using large LEO constellations, subsequently, the average TTFF for long baselines has a substantial shortened about 90%, in other words from 12 to 2 min approximately by combining with the larger LEO constellation of 192 or 288 satellites. It is interesting to denote that similar improvements can be observed from the convergence time.

A New Feed Network for The Communication Signal and Excitation of Surface-Wave-Driven Plasma Antennas

2020 ◽  
Author(s):  
Fatemeh Sadeghikia ◽  
Ali K. Horestani ◽  
Mohammad Reza Dorbin ◽  
Mahmoud Talafi Noghani ◽  
Hajar Ja'afar
Keyword(s):  
Surface Wave ◽  
Communication Signal ◽  
Feed Network

Focus Beam Synthesis With Circular Antenna Array Based On Radial Waveguide Feed Network

2021 ◽  
pp. 1-1
Author(s):  
Zhao Yang ◽  
Wenxian Zheng ◽  
Daniele Inserra ◽  
Jian Li ◽  
Yongjun Huang ◽  
...  
Keyword(s):  
Antenna Array ◽  
Focus Beam ◽  
Feed Network ◽  
Radial Waveguide ◽  
Circular Antenna Array
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