Abstract
This study is focused on highly coupled multiple antennas with defected ground slot techniques. Two Printed Inverted-F Antenna (PIFA) are positioned at the top edge of chassis symmetrically. Both antennas are operating at low-band Long-Term Evolution (LTE) with center frequency, 829MHz. Rectangular defected ground slot is implemented to reduce the coupling effect between the antennas on the ground plane of the small chassis. Parameter study of the rectangular defected ground slot is studied with different width, W and length, L. Furthermore, the optimized dimensions of rectangular defected ground slot, W and L are simulated and presented. The optimized defected ground slot reduced the mutual coupling up to -4.5 dB. The envelope correlation coefficient (ECC) achieved less than 0.5. The ground plane of the multiple antenna structure has been further investigated by introducing another slot with a gap of 1mm between them. The achieved result is not significant in term of S-parameter and ECC compared to single defected ground slot.
Highlights
In recent decades, there is an increasing demand in higher data rate transmission in the development of wireless communication
This paper investigates the effect of defected ground structure with Printed Inverted-F Antenna (PIFA) for the low-band Long-Term Evolution (LTE) (698-960 MHz) in a small mobile terminal
In the beginning of this paper, the antenna is operating at frequency of 829 MHz with mutual coupling of -2.8 dB
Summary
There is an increasing demand in higher data rate transmission in the development of wireless communication. Several studies have implemented defected ground plane to reduce the mutual coupling among antennas [4,5,6,7,8]. Other than Sparameters, the performance, such as total efficiency and ECC are presented This is to provide the insight concerning impact of defected ground plane on mutual coupling and ECC below 1 GHz. Section II presents the design of the antenna structure and the parameters of defected ground structure varied in this study. 85 λ is found to have a good impedance matching and a lower mutual coupling This shows that λ/4 can provides a promising performance as compared to other length of L with the exclusion of frequency detuned. The maximum detuned of fc is 331 MHz and the fc is shifted towards a higher frequency at 1.16 GHz. Figure 5(a) shows a decrease in the impedance matching of the antennas. Study of multiple antennas with defected ground slot for low-band LTE application (Wai Loon Cheor)
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