מערך אנטנות בקיטוב מעגלי
Circulary Polarized Antenna Array
One of the problems of circularly polarized antenna antenna arrays is the high axial ratio which is the result of the inherent asymmetry of the radiating element. One method of solving this problem is by implementing a technique known as "sequential rotation". This technique electrically compensates for the inherent asymmetry of the radiating element without physically modifying its structure.
In this project the students will design a computer model and build a prototype of two small antenna arrays consisting of circularly polarized printed circuit radiating elements . The first model will be a standard printed circuit antenna array. In the second array they will implement the "sequential rotation" technique.
The students will design a computer model and build a working prototype of two printed circuit antenna arrays.
1. The first model will be a standard printed circuit antenna array without using the the "sequential rotation" technique. The students will design and simulate the antenna patterns and axial ratio of the printed circuit antenna array.
2. The second model will be an antenna array using the sequential rotation technique in which the students will design a computer model of the same antenna array but this time they will implement the "sequential rotation" technique. They will then compare the simulation results of the two computer models.
3. After completing the simulation work, the students will then build two printed circuit antenna arrays prototypes. The first prototype will be the standard printed circuit array. The second array will be an antenna array using the "sequential rotation" technique.
4. The two arrays will then be measured in an antenna anechoic chamber and the results will be compared.
The computer model will be done with a CAE (Computer aided-engineering program) program known as CST.
In his project, the students, in addition to learning how to design computer simulation models of antennas will have the opportunity to become familiar with basic antenna and polarization theory. They will also be become acquainted with the process of transforming a computer model into an actual prototype.
Finally, they will have the opportunity learn how to measure an antenna in an anechoic chamber and to learn how to interpret their results.
1. Basic Electromagnetic Analysis
2. Transmission Line Theory
בשיתוף עם: Elta/IAI
1. "Broadband Circularly Polarized Microstrip Antenna
Array Using Sequentially Rotated Technique".
Yong-Jin Hu, Wei-Ping Ding, and Wen-Quan Cao, IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, VOL. 10, 2011.
2. CST Program : https://www.cst.com/Products/CSTMWS