Dual-Band Antenna at 28 and 38 GHz Using Internal Stubs and Slot Perturbations

Author:

Bhadravathi Ghouse Parveez Shariff1,Kumar Pradeep2ORCID,Mane Pallavi R.1,Pathan Sameena3ORCID,Ali Tanweer1ORCID,Boulogeorgos Alexandros-Apostolos A.4ORCID,Anguera Jaume56ORCID

Affiliation:

1. Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India

2. Discipline of Electrical, Electronic and Computer Engineering, University of KwaZulu-Natal, Durban 4041, South Africa

3. Department of Information and Communication Technology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India

4. Department of Electrical and Computer Engineering, University of Western Macedonia, 50100 Kozani, Greece

5. Ignion, 08174 Barcelona, Spain

6. Research Group on Smart Society, La Salle Engineering, Universitat Romon Llull, 08022 Barcelona, Spain

Abstract

A double-stub matching technique is used to design a dual-band monopole antenna at 28 and 38 GHz. The transmission line stubs represent the matching elements. The first matching network comprises series capacitive and inductive stubs, causing impedance matching at the 28 GHz band with a wide bandwidth. On the other hand, the second matching network has two shunt inductive stubs, generating resonance at 38 GHz. A Smith chart is utilized to predict the stub lengths. While incorporating their dimensions physically, some of the stub lengths are fine-tuned. The proposed antenna is compact with a profile of 0.75λ1×0.66λ1 (where λ1 is the free-space wavelength at 28 GHz). The measured bandwidths are 27–28.75 GHz and 36.20–42.43 GHz. Although the physical series capacitance of the first matching network is a slot in the ground plane, the antenna is able to achieve a good gain of 7 dBi in both bands. The proposed antenna has a compact design, good bandwidth and gain, making it a candidate for 5G wireless applications.

Publisher

MDPI AG

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