Very Compact 5.5 GHZ Band-Notched Uwb-Mimo Antennas With High Isolation

Abstract

Abstract-Two different types of band-notch UWB-MIMO antennas are proposed in this paper. The filtering effect can be achieved by integrating slot resonators to a UWB antenna. Both of the proposed antennas have very compact size and are smaller than most of the other band-notch UWB-MIMO antennas. The ultra-wideband is achieved by etching stepped slots on the ground. The band-notch characteristic can greatly reduce the potential interference between the UWB and WIMAX/WLAN system. Our proposed antennas can also possess a wide bandwidth from 3 GHz to 11 GHz with |S 11 | < −10 dB. Some effective measures have been taken and illustrated to reduce the isolation. Measurements demonstrate that the mutual coupling between the antenna elements is good enough for a MIMO system. Their stable radiation patterns are simulated, designed and measured successfully. The good performance and compact size make the antennas good candidates for UWB applications.

A Novel Uwb Antenna With Triple Band-Notches for Wimax and Wlan

“…Half or quarter wavelength strips in [6,7] are added to realize band-notched characteristic. Slots, like Z-shaped [8] or rectangular ones [9], are also embedded in antenna patch and ground to achieve band-notched function. Based on single band-notched antennas, designs about dual or multiple band-notched UWB antennas have been reported in recent years.…”

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

“…This can also be done by adding strips or stubs adjacent to the radiator or ground or feed line as discussed in [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Each slot or strip can function as a resonator, and the slot or strip length controls the notch center frequency.…”

“…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].…”

“…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]. The proposed antennas in [11][12][13][14][15][16][17] mostly reject WLAN band only.…”

“…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]. The proposed antennas in [11][12][13][14][15][16][17] mostly reject WLAN band only. Dual band-notched functions for UWB-MIMO antennas can be realized by employing nested C-shaped slots in the patch [18], etching 1λ loop path and 0.25λ slot on radiator [19], introducing strips beneath the patch [20], placing open-ended slot and SRR in the ground [21], placing a parasitic strip and open-ended slot on ground [22], or by loading trident-shape strip on the patch [23].…”