Full wave analysis and experimental verification of a broadband ridged horn antenna system with parabolic reflector

2002 ◽  
Author(s):  
C. Bruns ◽  
P. Leuchtmann ◽  
R. Vahldieck
Keyword(s):  
Experimental Verification ◽  
Horn Antenna ◽  
Antenna System ◽  
Wave Analysis ◽  
Parabolic Reflector ◽  
Full Wave ◽  
Full Wave Analysis

scholarly journals Design & Optimization of Large Cylindrical Radomes with Subcell and Non-Orthogonal FDTD Meshes Combined with Genetic Algorithms

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2263
Author(s):  
Enrique A. Navarro ◽  
Jorge A. Portí ◽  
Alfonso Salinas ◽  
Enrique Navarro-Modesto ◽  
Sergio Toledo-Redondo ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Antenna Array ◽  
Near Field ◽  
Antenna System ◽  
Curvilinear Coordinates ◽  
Ultraviolet Rays ◽  
Wave Analysis ◽  
Full Wave ◽  
Full Wave Analysis ◽  
Optimization Loop

The word radome is a contraction of radar and dome. The function of radomes is to protect antennas from atmospheric agents. Radomes are closed structures that protect the antennas from environmental factors such as wind, rain, ice, sand, and ultraviolet rays, among others. The radomes are passive structures that introduce return losses, and whose proper design would relax the requirement of complex front-end elements such as amplifiers. The radome consists mostly in a thin dielectric curved shape cover and sometimes needs to be tuned using metal inserts to cancel the capacitive performance of the dielectric. Radomes are in the near field region of the antennas and a full wave analysis of the antenna with the radome is the best approach to analyze its performance. A major numerical problem is the full wave modeling of a large radome-antenna-array system, as optimization of the radome parameters minimize return losses. In the present work, the finite difference time domain (FDTD) combined with a genetic algorithm is used to find the optimal radome for a large radome-antenna-array system. FDTD uses general curvilinear coordinates and sub-cell features as a thin dielectric slab approach and a thin wire approach. Both approximations are generally required if a problem of practical electrical size is to be solved using a manageable number of cells and time steps in FDTD inside a repetitive optimization loop. These approaches are used in the full wave analysis of a large array of crossed dipoles covered with a thin and cylindrical dielectric radome. The radome dielectric has a thickness of ~λ/10 at its central operating frequency. To reduce return loss a thin helical wire is introduced in the radome, whose diameter is ~0.0017λ and the spacing between each turn is ~0.3λ. The genetic algorithm was implemented to find the best parameters to minimize return losses. The inclusion of a helical wire reduces return losses by ~10 dB, however some minor changes of radiation pattern could distort the performance of the whole radome-array-antenna system. A further analysis shows that desired specifications of the system are preserved.

Conformal antenna array for ultra-wideband direction-of-arrival estimation

2011 ◽  
Vol 3 (4) ◽  
pp. 439-450 ◽  
Author(s):  
Iñigo Liberal ◽  
Diego Caratelli ◽  
Alexander Yarovoy
Keyword(s):  
Direction Of Arrival ◽  
Dipole Antenna ◽  
Antenna System ◽  
Ultra Wideband ◽  
Direction Of Arrival Estimation ◽  
Antenna Element ◽  
Wave Analysis ◽  
Antenna Performance ◽  
Full Wave ◽  
Full Wave Analysis

The design and full-wave analysis of an antenna system for ultra-wideband radio direction finding applications is presented. The elliptical dipole antenna is selected as antenna element due to its robust circuital and radiation properties. The influence of the conformal deformation on the antenna performance has been studied in details. A suitable radome is designed to enhance the antenna front-to-back radiation ratio, as well as to increase the environmental durability of the structure. The considered antennas are optimized for their adoption in two different sub-arrays covering the [250, 950] MHz and [0.9, 3.3] GHz frequency bands, respectively. A uniform circular array (UCA) with five elements is used for the array topology. The full-wave analysis of the whole array structure is carried out in order to evaluate the coupling between the antenna elements. In particular, a novel calibration technique is developed in order to compensate for the mutual coupling between the array elements, possible variations in the antenna characteristics, and the effects of the array bearing structure. The performance of the designed array in terms of direction-of-arrival estimation is thoroughly analyzed and discussed.

Full-wave analysis of shielded coplanar waveguide short-end

1990 ◽  
Vol 26 (19) ◽  
pp. 1615 ◽  
Author(s):  
G. Bartolucci ◽  
J. Piotrowski
Keyword(s):  
Coplanar Waveguide ◽  
Wave Analysis ◽  
Full Wave ◽  
Full Wave Analysis

Erratum: Full-wave analysis of shielded coplanar waveguide short-end

1990 ◽  
Vol 26 (22) ◽  
pp. 1922
Author(s):  
G. Bartolocci ◽  
J. Piotrowski
Keyword(s):  
Coplanar Waveguide ◽  
Wave Analysis ◽  
Full Wave ◽  
Full Wave Analysis

Full-wave analysis of periodic microstrip lines excited by an aperiodic delta-gap source

2007 ◽  
Author(s):  
R. Rodriguez-Berral ◽  
G. Valerio ◽  
F. Mesa ◽  
P. Baccarelli ◽  
P. Burghignoli ◽  
...  
Keyword(s):  
Wave Analysis ◽  
Microstrip Lines ◽  
Full Wave ◽  
Full Wave Analysis
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