WIDEBAND CAPACITIVELY COUPLED 1×8 ARRAY ANTENNA FOR 5G mmWAVE MOBILE PHONE APPLICATIONS

Authors : Yavuz Aşçı
Pages : 691-710
Doi:10.17482/uumfd.1514008
View : 111 | Download : 190
Publication Date : 2025-12-19
Article Type : Research Paper
Abstract :This communication proposes a linearly polarized, wideband capacitively coupled array antenna for the fifth generation (5G) millimeterwave (mmWave) mobile phone applications. The wideband, high gain unit antenna is first designed in order to form the 1×8 array antenna. The proposed unit antenna made up of a pair of rectangular radiators that are capacitively coupled to the feed line, and two semi-elliptical radiators that are coupled to rectangular radiators. The use of two semi-elliptical structures improves operating bandwidth and gain. The proposed antenna is printed on the commercial RTRogers5880 substrate (εr= 2.2, δ= 0.009) with a thickness of 0.8 mm. All design and simulation steps are implemented via CST Microwave Studio. According to simulation results, the unit antenna has a wide frequency bandwidth of 24.2 – 30.36 GHz for |S11|< -10 dB, with a corresponding fractional bandwidth (FBW) of 22.2%. The unit antenna has low profile of 10mm × 8mm × 0.8mm with peak gain of 7.15 dBi. The simulation results show that the unit antenna covers the entire frequency spectrum of 5G mmWave bands of n257, n258, and n261. For high-gain, 1×8 array antenna is designed which is integrated into the mobile phone chassis, with a dimension of 60mm × 6.5mm × 0.8mm (5.5λ0 × 0.6λ0 × 0.07λ0; λ0 is the free space wavelength at 27.5GHz – 10.9mm), which has a frequency bandwidth of 24.7 – 30.1 GHz (FBW= 19.7%) for |S11|< -10 dB. The boresight gain of the 1×8 array antenna is between 14.31 and 15.46 dBi with a radiation efficiency of more than 88%. In addition, the 1-D beam steering range of the array is also investigated. It is found that scanning range is approximately ±30ο. The isolation between ports is better than 16 dB over the operating band. The proposed 1×8 array antenna is ideal for 5G mmWave mobile phone applications due to its wide bandwidth, low profile, beam steering property, moderate gain and isolation.
Keywords : Hüzme yönlendirme, kapasitif bağlaşımlı, 5G milimetre dalga dizi anten, cep telefonu, geniş bant anten

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