scholarly journals Effects of Reentry Plasma Sheath on Mutual-Coupling Property of Array Antenna

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
B. W. Bai ◽  
X. P. Li ◽  
Y. M. Liu ◽  
J. Xu
Keyword(s):  
Mutual Coupling ◽  
Collision Frequency ◽  
Plasma Sheath ◽  
Array Antenna ◽  
Coupling Coefficients ◽  
Integration Technique ◽  
Reentry Vehicle ◽  
Coupling Property ◽  
Single Antenna ◽  
Array Antennas

A plasma sheath enveloping a reentry vehicle would cause the failure of on-board antennas, which is an important effect that contributes to the “blackout” problem. The method of replacing the on-board single antenna with the array antennas and using beamforming technology has been proposed to mitigate “blackout” problem by many other researchers. Because the plasma sheath is a reflective medium, plasma will alter the mutual coupling between array elements and degrade the beamforming performance of array antenna. In this paper, the effects of the plasma sheath on the mutual coupling properties between adjacent array elements are studied utilizing the algorithm of finite integration technique. Results show that mutual coupling coefficients of array elements are deteriorating more seriously with the decrease of collision frequency. Moreover, when electron density and collision frequency are both large, plasma sheath improves the mutual coupling property of array elements; this conclusion suggests that replacing the on-board single antenna with the array antennas and using beamforming technology can be adopted to mitigate the blackout problem in this condition.

scholarly journals Reduction of Mutual Coupling and Return Loss in Microstrip Array Antennas Using Concave Rectangular Patches

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Shahram Mohanna ◽  
Ali Farahbakhsh ◽  
Saeed Tavakoli ◽  
Nasser Ghassemi
Keyword(s):  
Mutual Coupling ◽  
Return Loss ◽  
Array Antenna ◽  
Effective Solution ◽  
Rectangular Array ◽  
Rectangular Patch ◽  
Array Antennas ◽  
Microstrip Array ◽  
Patch Length ◽  
Microstrip Array Antenna

An effective solution to reduce both the mutual coupling and return loss of a microstrip array antenna consisting of rectangular patches is proposed. The patch is made concave in both horizontal and vertical sides. Applying the proposed structure to a microstrip array antenna having two elements, the effects of patch concavity on the mutual coupling and return loss are simulated and studied. To obtain a concave rectangular patch array antenna having low amounts of mutual coupling and return loss, the patch length and width as well as the amounts of concavities are optimized using an enhanced genetic algorithm. To verify the simulation results, then, the optimal array antenna is fabricated. The simulation and experimental results confirm that the optimal concave rectangular array antenna has low amounts of mutual coupling and return loss.

scholarly journals Design of a Four-Element Array Antenna for 5G Cellular Wireless Networks

2020 ◽  
Vol 10 (5) ◽  
pp. 6259-6263
Author(s):  
D. T. T. My ◽  
H. N. B. Phuong ◽  
T. T. Huong ◽  
B. T. M. Tu
Keyword(s):  
Finite Element Method ◽  
Array Antenna ◽  
Planar Antenna ◽  
Double Positive ◽  
Power Dividers ◽  
Single Antenna ◽  
Array Antennas ◽  
Cellular Wireless Networks ◽  
Simulation Results ◽  
Element Array

This paper proposes the design of a four-element array planar antenna based on a single antenna that combines the Double Positive (DPS) and Epsilon Negative (ENG) materials. The single antenna consists of a microstrip segment (which is equivalent to a DPS material) connected to a grounded microstrip segment (which is equivalent to an ENG material). T-Junction power dividers with one-input and two-output ports are used for feeding the two-element and the four-element array antennas. The proposed array antenna is designed to operate optimally at 30GHz frequency under Finite Element Method (FEM)-based simulation. The obtained simulation results show that the proposed array antennas have good radiation performances, in which the four-element array antenna has a -10dB bandwidth ranging from 28.7 to 33.4GHz and 12.9dBi gain.

Research and Analysis about Array Antennas in Mobile Communications

2013 ◽  
Vol 760-762 ◽  
pp. 628-633
Author(s):  
Li Zhou ◽  
Ming Hou
Keyword(s):  
Antenna Array ◽  
Mobile Communications ◽  
Smart Antenna ◽  
Array Antenna ◽  
Aperture Antenna ◽  
Symmetry Center ◽  
Single Antenna ◽  
Array Antennas ◽  
Direction Diagram

Because the direction of a single antenna is limited, and for strengthening the direct radiant ability of the antenna, we will put the weaker direction antennas together in some way to constitute an antenna array system. The antenna array is also called the array antenna or a disperse antenna array. The antenna cell can be the symmetry center-fed dipole, the aperture antenna, the circle antenna or other forms of the antennas whose direction are limited. In practice, the antenna array is almost constituted of similar antenna cells. I have mainly completed the antenna array direction diagram in conditions of some kinds of parameters. And at last, I get the useful results for practice. This also provides theories basis for the analysis of smart antenna.

scholarly journals Effects of Reentry Plasma Sheath on GPS Patch Antenna Polarization Property

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
L. Zhao ◽  
B. W. Bai ◽  
W. M. Bao ◽  
X. P. Li
Keyword(s):  
Patch Antenna ◽  
Polarization Characteristic ◽  
Polarization Property ◽  
Plasma Sheath ◽  
Integration Technique ◽  
Circularly Polarized ◽  
Reentry Vehicle ◽  
Mismatch Loss ◽  
Antenna Polarization ◽  
Gps Antenna

A plasma sheath enveloping a reentry vehicle would affect performances of on-board antenna greatly, especially the navigation antennas. This paper studies the effects of reentry plasma sheath on a GPS right-hand circularly polarized (RHCP) patch antenna polarization property during a typical reentry process. Utilizing the algorithm of finite integration technique, the polarization characteristic of a GPS antenna coated by a plasma sheath is obtained. Results show that the GPS RHCP patch antenna radiation pattern distortions as well as polarization deteriorations exist during the entire reentry process, and the worst polarization mismatch loss between a GPS antenna and RHCP GPS signal is nearly 3 dB. This paper also indicates that measures should be taken to alleviate the plasma sheath for maintaining the GPS communication during the reentry process.

Analysis and design methods of planar array antennas with slotted waveguides taking into account mutual coupling

1989 ◽  
Vol 72 (10) ◽  
pp. 103-110 ◽  
Author(s):  
Yoshihiko Konishi ◽  
Hitoshi Mizutamari ◽  
Shin-Ichi Sato ◽  
Seiji Mano ◽  
Takashi Katagi
Keyword(s):  
Mutual Coupling ◽  
Design Methods ◽  
Analysis And Design ◽  
Array Antennas ◽  
Planar Array

Scanning characteristics of spherical dome antenna composed of arcing dipole array antennas including the effects of mutual coupling between elements

1988 ◽  
Vol 71 (8) ◽  
pp. 91-101
Author(s):  
Tadahiko Maeda ◽  
Kunio Sawaya ◽  
Saburo Adachi ◽  
Yasuto Mushiake
Keyword(s):  
Mutual Coupling ◽  
Spherical Dome ◽  
Array Antennas

Effect of Plasma Sheath Covering Spacecraft-Borne Array Antenna on Direction-of-Arrival Estimation

2021 ◽  
Vol 49 (9) ◽  
pp. 2681-2689
Author(s):  
Bowen Bai ◽  
Yi Ding ◽  
Lihao Song ◽  
Yanming Liu ◽  
Xiaoping Li ◽  
...  
Keyword(s):  
Direction Of Arrival ◽  
Plasma Sheath ◽  
Array Antenna ◽  
Direction Of Arrival Estimation
Sign in / Sign up

Export Citation Format

Share Document