Bandwidth and Gain Enhancement of MIMO Antenna by Using Ring and Circular Parasitic with Air-Gap Microstrip Structure
Abstract: This research was proposed
a circular patch MIMO antenna by using a ring and circular parasitic radiator
structure. As a novelty, in order to enhance bandwidth and gain of circular
patch MIMO antenna, a conventional circular patch MIMO antenna will be added a
ring and a circular parasitic. Therefore, this research was investigated a
conventional MIMO antenna (C-MA), ring parasitic MIMO antenna (RP-MA), and
circular parasitic MIMO antenna (CP-MA) as Model 1, Model 2, and Model 3,
respectively. This MIMO antenna was designed on FR4 microstrip substrate with r= 4.4, thickness h=1.6 mm, and tan = 0.0265. This MIMO
antenna has center frequency 2.35 GHz which is a frequency band for LTE
application inIndonesia. An Advance Design System (ADS) software was used to
determine the antenna parameters. The MIMO antenna C-MA / RP-MA/ CP-MA achieves
2.36GHz/ 2.38GHz/ 2.38 GHz, 70 MHz/ 100 MHz/120 MHz, 1.625 dBi/ 4.066 dBi/
4.117 dBi, 6.414 dBi/ 7.26 dBi/ 7.153 dBi, 33.9 %/ 47.8 %/ 49.70 %, -12.35 dB/
-22.21 dB/ -23.66 dB, and -30.924 dB/ -28.46 dB/ -27.59 dB for center
frequency, bandwidth, gain, directivity, efficiency, reflection coefficient,
and mutual coupling, respectively. Compared to C-MA (Model1) performances, The
result showed that proposed antenna has wider-bandwidth/ higher-gain with
42.8%/150.2 %, and 71.4%/ 163.3% for RP-MA (Model 2) and CP-MA (Model 3),
respectively. The proposedantenna has size of 50 mm x 130 mm x 23.2 mm.
Measured results are in a good agreement with the simulated results.
Author: Teguh Firmansyah
Journal Code: jptkomputergg170050
