Design of Triple Band Antenna for Indoor 4G-LTE and 5G-NR Distributed Antenna System

A low-profile triple band antenna is designed, investigated and developed to use as the indoor mounted ceiling antenna for 4G-LTE and 5G-NR distributed antenna system. The proposed antenna is implemented on 0.8-mm thickness PCB substrate and obtains the compact size of 120 ×135 mm
²
, which composes of oval patch trimmed by three slots and microstrip feed line on chamfered ground plane with tuning slot. A prototype antenna is measured impedance bandwidth which covers three operating frequency bands of 690 - 960 MHz, 1710 - 2700 MHz and 3300 - 4000 MHz. Also, the average antenna gains are 1.8, 3.2, and 2.6 dBi at each operating band, respectively. The proposed antenna obtains omnidirectional pattern over the entire frequency ranging from 700 until 2500 MHz and bidirectional pattern for the frequency above 2500 MHz. According to comparisons, the measured results are in good agreement with the simulated one.