Compact CPW-fed UWB MIMO antenna with a novel modified Minkowski fractal defected ground structure (DGS) for high isolation and triple band-notch characteristic

A Very Compact Mimo Antenna With Triple Band-Notch Function for Portable Uwb Systems

“…A number of experiments were done earlier to integrate the single and multiple band-notch functions for UWB systems and hence to mitigate the frequency interference from narrowband systems [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Methods such as etching λ/4 and λ/2 resonators on the ground [11], introducing split-ring resonator (SRR) slots on radiator [12], incorporating two rectangular strips on the ground plane [13], etching a 1λ slot into radiator [14], slitting λ/4 open-ended L-shaped slots on the radiator elements [15], employing λ/4 and λ/2 resonators [16], and using elliptical SRR on the radiator [17].…”

“…Recently, some papers have been presented to achieve triple band-notched functions for UWB MIMO systems [24][25][26]. A compact UWB antenna having 30 × 60 mm 2 with triple notches for polarization diversity applications was designed in [24].…”

“…Triple bandnotched properties at WiMax/WLAN/X-bands can be realized by adding two C-shaped slots into the radiator. In [26], a compact CPW-fed isolation-enhanced MIMO antenna of size 26.75 mm × 41.5 mm with Minkowski fractal DGS for UWB applications was developed. Identical rectangular slots on a ground plane and rotated C-shaped slots from radiator were used to achieve triple rejected bands at 3.3-3.7, 3.7-4.2, and 5.15-5.85 GHz, respectively.…”

“…Identical rectangular slots on a ground plane and rotated C-shaped slots from radiator were used to achieve triple rejected bands at 3.3-3.7, 3.7-4.2, and 5.15-5.85 GHz, respectively. The antennas reported in [24][25][26] have three notched bands with good isolation, but they are not compact enough, and antenna designs are somewhat complex. So, there is a need for the design of simple, isolation-enhanced and very compact band-notched UWB MIMO antennas for portable devices.…”

“…Overall size of the antenna is 18 × 21 × 0.8 mm 3 which is very small compared to the antennas reported in [24][25][26][27][28]. Two simple planar monopole elements are used as antenna elements of the UWB MIMO antenna, fed by a 50-Ω microstrip line.…”