الفهرس 
AbstractOnly 14 pages are availabe for public view
 |  | from | 94 |  |  |
| | | from | 94 | | |
Abstract
This Thesis discussed and summarized the effect of different ground structures of the same CDR antenna on the operating frequency band, radiation pattern, and maximum gain.
• The First Proposed Antenna: allows the antenna to opera at frequency bands (2 - 2.8) GHz, (5.7-7.2) GHz, (9.7-10.7) GHz, and (13.4-14.3) GHz.
• The Second Proposed Antenna: allows the antenna to operate at frequency bands (2.5 – 3.7) GHz, (7 – 8.6) GHz, (10.5 -12) GHz, and (14.6 – 15.9) GHz.
• The Main (third) Proposed Antenna: allows the antenna to operate at frequencies bands (6.7 – 7.5) GHz, (11.7 – 13.5) GHz, and (14.30 - 25) GHz with the Fractional Bandwidth (FBW) of 11.6%, 14.6%, and 49.7% respectively. The simulated reflection coefficient result is <-10 dB.
Each proposed antenna is capable of operating in different frequency bands, but the third CDRA has a wider frequency range extending from 6.70 GHz to 7.50 GHz, 11.7 GHz to 13.5 GHz, and from 14.3 GHz to beyond 35 GHz with a peak gain of 8.5 dBi. Proved these results by using two different simulators (HFSS and CST) with different solving techniques (FEM and FIT, respectively). it is a good candidate for use in WiMAX, C-band, X-band, Ku-band, 5G, sub-6 GHz, and modern millimeter wave wireless technology applications.
5.2 Future Work
In this section, some suggestions for future work are presented as follows:
• Design compact size Dielectric antenna with different shapes.
• This research can be extended to design a more compact DRA -MIMO antenna with high performance, increasing its isolation and being suitable for mobile applications.
• Using MIMO antenna in beamforming, 5G, and sub 6G applications.