The proposed antennas are the combination of two and three single element antennas. The single antennas size was 36 x 12 mm and printed on 0.8 mm-thick FR-4 substrate with 0.035mm-thick Copper ground and patch. The single antennas consist of s-shaped patch and plane ground. The MIMO antennas provides the coverage to the users in linear direction. The simulated results showed that both of the single element antennas had the reflection coefficient (S11) of -42.67 dB and -53.80, less than -10 dB in the frequency range of respectively “LTE band 47” and “LTE band n79”. More than 100 MHz of 10dB impedance bandwidth was obtained. The gain of the both antenna linear array was 4.47 dBi and 3.59 dBi while the suppression of the side lobes was -2.3 dB and -0.7 dB. It showed overall of VSWR were below 1.58. Based on the above, the proposed MIMO antennas are a prospective candidate for future 5G applications.

DOI: 10.11591/ijece.v11i6.pp5558-5567

DOI: 10.13140/RG.2.2.16156.92808

Also, in great pandemics, human medical personnel cannot always do specific tasks well, which can be done more efficiently in less time by a mobile bot. In this paper, we focus on a smart mobile medicine serving bot system named "Medi-Bot", that can help patients with all his/her medication at the correct time and do these works without infecting others. Medi-Bot stores all the information about the patient in a database. An android app controls the bot so the caregiver can fill the bot's medicine box with the patient's respective medicines and send it to the patient room. The bot contains a microcontroller unit, voice system unit, Wi-Fi module, an RTC module, and a GSM module. Thus, after entering the patient room, it tells the patient about taking medicine and sends an SMS alert to the caregiver with the medicine name and time. For the medication of different times of day, the bot has six individual boxes. It opens the respective medicine box and also indicates the box with an inbuilt LED. After a particular time, the bot sends an SMS alert to the caregiver notifying whether the patient has taken the right medicine in time. This bot also has an in-built sanitizing system that ensures to keep any infectious disease from further spreading and help as a sanitizing bot. This kind of bot can be remarkably effective in hospitals and clinics and can play a considerable role in pandemics when people fail to get enough medical attention in time.