Abstract
A coplanar waveguide- (CPW-) fed dual-band multiple-input multiple-output (MIMO) antenna for 2.45/5.5 GHz wireless local area network (WLAN) applications is presented in this paper. The presented MIMO antenna consists of two identical trapezoidal radiating elements which are perpendicular to each other. The size of the entire MIMO antenna is 50 × 50 × 1.59 mm3, which is printed on a FR4 substrate. The measured impedance bandwidth of the proposed antenna is 2.25–3.15 GHz and 4.89–5.95 GHz, which can cover IEEE 802.11 a/b/g frequency bands. A rectangular microstrip stub is introduced to achieve a good isolation which is less than −15 dB in both operation frequency bands. The measured peak gain is 5.59 dBi at 2.45 GHz and 5.63 dBi at 5.5 GHz. The measured antenna efficiency is 77.8% and 80.4% in the lower and higher frequency bands, respectively. The ECC values at the lower and higher frequencies are lower than 0.003 and 0.01, respectively.
Highlights
Ere are many technologies to implement dual-band multiple-input multiple-output (MIMO) antennas
E two identical antenna elements are perpendicular to each other. e antenna elements are fed by coplanar waveguides. e width of the CPW signal line is 3 mm. e radiating element is composed of a trapezoidal patch with two rectangular slits, an L-shaped slit, and a semicircular slit
We can see that the bandwidth with reflection coefficient S11 less than −10 dB is 900 MHz (2.25–3.15 GHz) and 1060 MHz (4.89–5.95 GHz). e realized two frequency bands can cover 802.11 a/b/g (WLAN, 2.4–2.4835 GHz, 5.15–5.875 GHz) frequency bands. e measured mutual coupling S21 between the two antenna elements is less than −15 dB in the desired frequency bands (2.4–2.4835 GHz, 5.15–5.875 GHz)
Summary
Ere are many technologies to implement dual-band MIMO antennas. For example, a microstrip line feed antenna with two quarter-wavelength slots is used as an antenna element that achieves high radiation efficiency under dual band [15]. A CPW-fed dual-band MIMO antenna suitable for WLAN applications is presented. E rectangular slits and L-shaped slit are used to obtain good impedance matching in the lower and higher frequency bands, respectively.
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