Design of a compact antenna with broadband and high gain

ABSTRACT

A novel compact antenna with characteristics of broadband and high gain is proposed in this paper. The proposed antenna comprises 1 × 2 elements that are connected together by a balance power divider. To create a new shape, the proposed antenna is a combination of dipole and patch shapes and acts as a monopole. As a result, the impedance bandwidth is enhanced. Additionally, the gain of the proposed antenna is improved by using an artificial magnetic conductor (AMC) surface. The antenna prototype, with an overall size of 0.66 λ₀ x 0.79 λ₀ x 0.11 λ₀ (λ₀ is the wavelength in free space at the lowest operating frequency of 2.63 GHz) has a −10 dB bandwidth of 78% (2.63–6 GHz), a broadside gain of 11.5 dBi, 3-dB gain bandwidth of 19%, and a total efficiency over79% in all operating frequency bands. Thanks to the presence of AMC surface and the combination ofmicrostrip and dipole shapes, the antenna resulted in an overall larger bandwidth, low sidelobe level, and higher gain and efficiency.

KEYWORDS:

• AMC
• array antenna
• artificial magnetic conductor
• dipole antenna
• metasurface
• microstrip antenna
• monopole

Acknowledgments

Thanks to Mr. Nguyen Minh Thien and Laboratory of Monolithic Microwave Integrated Circuit (MMIC) & Applications for Embedded Systems – International University, VNU Ho Chi Minh City, Vietnam supported us in antenna measurement.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The contribution of Cong Danh Bui was supported by Science Foundation Ireland, grant number 13/RC/2077_P2