volume | PIER Journals

Abstract

In this paper, a tunable ultra-wideband antenna based on slot structures is presented and verified using Characteristic Mode Analysis. The antenna is backed with a partial ground plane and covers the 2.8-13.2 GHz frequency band. In this wide frequency range, satisfactory VSWR and gain are achieved. To avoid interference with wireless local area network WLAN (5.2 to 5.8 GHz) and X-Band satellite links (7.9 to 8.4 GHz), two notches are created using U-shaped and elliptical slots. An important feature of this paper is the use of varactor diode in the elliptical slot to achieve tunable frequencies for the second notched band. By applying different bias voltages, the center frequency of the second notched band is continuously tuned. The antenna performance is verified using modal parameters including modal significance and characteristic angle within the working region of the proposed antenna using the theory of characteristic modes analysis. This antenna is implemented on top of a cost-effective FR4 substrate with a 1 mm thickness. The proposed flower-shaped antenna is compact in size and provides ultra-wide bandwidth. The dimension of the optimized design is 25 × 35 × 1 mm³.

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Ms. Azadeh Shahpari

Dr. Mohsen Shafeghati