Investigation of Parallel and Orthogonal MIMO Antennas with Two-Notched Structures for Ultra-Wideband Application

Area of Science:

• Electrical Engineering
• Electromagnetics
• Wireless Communication

Background:

• Ultra-wideband (UWB) systems face interference from narrowband systems, causing multipath fading.
• High isolation is crucial for multiple-input multiple-output (MIMO) antenna designs in UWB applications.
• Existing antenna designs may not meet the stringent requirements for isolation and bandwidth in UWB.

Purpose of the Study:

• To design and evaluate novel MIMO antennas with double-notch structures for UWB applications.
• To address interference issues and enhance isolation in UWB MIMO systems.
• To achieve wider bandwidth and higher gain compared to existing antenna solutions.

Main Methods:

• Designed two-element and four-element MIMO antennas incorporating U-shaped slots for notch characteristics.
• Utilized U-shaped slots on radiating patches and feeders for WiMAX and ITU band notches.
• Implemented parallel symmetric placement for the two-element antenna and orthogonal placement for the four-element antenna, with additional branch loading for isolation enhancement.

Main Results:

• Achieved wide working bandwidths of 2.45-14.88 GHz and 2.14-14.95 GHz for the two- and four-element antennas, respectively.
• Demonstrated high isolation levels exceeding 17 dB and 20 dB.
• Obtained peak gains of 5.7 dBi and 5.9 dBi, with improved radiation efficiency compared to reference designs.

Conclusions:

• The designed double-notch MIMO antennas effectively mitigate interference and meet high isolation requirements for UWB systems.
• The antennas exhibit superior performance in terms of bandwidth, gain, and radiation efficiency.
• These antennas are suitable for a wide range of wireless communication applications requiring robust UWB performance.