5G mmDalga Cep Telefonu Uygulamaları için Geniş Bantlı Kapasitif Bağlaşımlı 1×8 Dizi Anten

Abstract

Bu çalışmada, beşinci nesil (5G) milimetre dalga (mmDalga) mobil telefon uygulamaları için doğrusal polarize geniş bant kapasitif bağlaşımlı bir dizi anten önerilmiştir. İlk olarak dizi anten için geniş bant ve yüksek kazanca sahip birim anten tasarlanmıştır. Önerilen birim anten, besleme hattına kapasitif olarak bağlanmış bir çift dikdörtgen ışıma elemanı ve yarı eliptik ışıma elemanından oluşmaktadır. Antenin çalışma bant genişliğini ve kazancını artırmak için dikdörtgen ışıma elemanlarına kapasitif olarak bağlı iki yarı eliptik yapı eklenmiştir. Önerilen anten RTRogers5880 alttaş üzerinde modellenmiştir. Bu alttaşın kalınlığı 0.8 mm, dielektrik sabiti (εr) 2.2 ve kayıp tanjantı (δ) 0.0009’dur. Tüm tasarım ve benzetim adımları CST Microwave Studio kullanılarak gerçekleştirilmiştir. Benzetim sonuçları, birim antenin |S11|< -10 dB için 24.2 – 30.36 GHz arasında geniş bir frekans bant genişliğine sahip ve ilgili oransal bant genişliğinin (OBG) % 22.2 olduğunu göstermektedir. Birim anten, 7.15 dBi tepe kazancı ile 10 mm × 8 mm × 0.8 mm’lik bir profile sahiptir. Benzetim sonuçlarına göre, birim anten 5G mmDalga bantlarının n257, n258 ve n261 frekans bantlarını tamamını kapsamaktadır. Yüksek kazanç için, cep telefonu şasisine entegre edilmiş 60mm × 6.5mm × 0.8mm (5.5λ0 × 0.6λ0 × 0.07λ0) boyutlarına sahip 1×8 dizi anten tasarlanmıştır. λ0, 27.5 GHz’de serbest uzay dalga boyudur. Tasarlanan 1×8 dizi anten, |S11|< -10 dB için 24.7 – 30.1 GHz (OBG= %19.7) frekans bant genişliğine, 14.31 ile 15.46 dBi arasında boresight kazanca ve %88'in üzerinde ışıma verimliliğine sahiptir. Ayrıca, dizinin 1-boyutlu hüzme yönlendirme aralığı da incelenmiş ve yaklaşık ±30ο bulunmuştur. Portlar arası izolasyon çalışma bandı boyunca 16 dB'den daha iyidir. Önerilen dizi anten, geniş bant genişliği, düşük profili, hüzme yönledirme özelliği, orta seviyeli kazancı ve orta seviyeli izolasyonu nedeniyle 5G mmDalga mobil telefon uygulamaları için uygundur.

Keywords

• Hüzme yönlendirme
• kapasitif bağlaşımlı
• 5G milimetre dalga dizi anten
• cep telefonu
• geniş bant anten

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

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

• beam steering
• capacitively coupled
• 5G mmWave array
• mobile phone
• wideband antenna

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