A Compact Multiband Mimo Antenna for Ieee 802.11 a/B/G/N Applications

Abstract

A compact multiband multiple-input-multiple-output (MIMO) antenna for WLAN applications is presented in this paper. The proposed MIMO antenna consists of two symmetric monopole radiating elements designed to operate over 2.45, 5.2, and 5.8 GHz bands. The isolation is enhanced by using several techniques such as parasitic elements and defected ground structure. The measured S 11 < −10 dB is obtained over 2.36-2.68 GHz and 4.81-5.95 GHz, which can cover IEEE 802.11 a/b/g/n frequency bands (2.4-2.4835 GHz, 5.15-5.35 GHz, and 5.725-5.875 GHz). The measured isolation values S 21 are less than −24 dB and −27 dB over the lower and higher frequency bands, respectively. The envelope correlation coefficient (ECC) of the proposed antenna is less than 0.027 and 0.005 over the lower and higher operating bands, respectively. The overall size of the proposed antenna is 50 × 30 × 1.59 mm 3. The proposed antenna is a good candidate for IEEE 802.11 a/b/g/n applications.

A Quad-Port Dual-Band MIMO Antenna Array for 5G Smartphone Applications

“…Dual-band four-port MIMO antenna can expand system capacity and realize multi-mode communication. To minimize the unwanted mutual coupling, various isolation techniques have been reported in recent years [3][4][5][6][7][8][9][10][11][12][13][14]. The rectangle slots of the defected ground plane and two rectangular microstrip lines are employed to decrease the mutual coupling in [3].…”

“…By introducing two short T-shaped strips and a π-shaped strip, the isolation between two antenna elements is enhanced [6]. An inverted-F antenna is used to reduce the mutual coupling of antenna elements [7]. Other decoupling techniques have also been presented, such as using a short neutral line [8,9], high-pass filter [10], pattern diversity [11], self-decoupling [12], defected ground structure [13], and metamaterial structure [14].…”

SRR Loaded Compact Tri-Band Mimo Antenna for Wlan/Wimax Applications

“…In order to support the utilization of MIMO orthogonal data streams for increasing the channel capacity of various microwave applications like Wi-Fi, WiMAX, WLAN are proposed in [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Conventional microstrip patch antenna can be used to realize MIMO response by using various isolation techniques which are discussed in [10][11][12][13].…”

“…Though isolation performance is better, it does require a large size to implement, and bandwidth coverage is low. The antenna design in [19] has L-and E-shaped stubs and a strip respectively along with two rectangle stubs. Further, parasitic elements and DGS are present in the ground plane to improve isolation performance.…”

A High Isolation Multiband Mimo Antenna Without Decoupling Structure for Wlan/Wimax/5g Applications

“…MIMO antenna signal correlation should be low with good impedance characteristics, and individual elements possess high efficiency and isolation [1][2][3]. However, it is challenging to design antenna elements in a small, constrained space with high isolation, and there are various techniques [4][5][6][7][8][9][10][11][12][13][14][15][16][17] used by researchers to attain high isolation. In [4], a MIMO antenna with a dual-band resonance and a size of 74× 47.3 mm 2 is designed for WLAN application.…”