Narrow Results

In this paper, a wideband printed polygon-shaped monopole antenna has been designed using microstrip line feeding technique which provides dual-notch band characteristics (2.98–3.19GHz) and (3.62–5.00GHz) by the use of slots geometry in both the patch and the ground plane. The results of the antenna have been compared both with and without slots in both planes. The initial antenna without DGS and slots in the patch was made to work in the frequency range from 2.56–5.98GHz having impedance bandwidth of about 80.09%. The proposed antenna can be made usable for multi-band applications such as WLAN (2.4/3.2/5.2/5.8GHz) and Wi-MAX (3.5 and 5.5GHz) applications providing fractional bandwidth (FBW) of 85.36% (2.33–5.80GHz) and maximum peak gain of 5.65dBi at 3.50GHz. The value of return loss obtained is about 53.36dB at 2.56GHz. Prototype of the final antenna is fabricated and the results are verified with the simulated ones.

In this paper, two novel low-profile monopole antennas are presented for simultaneous operation in GPS (Global Positioning System), WLAN (Wireless Local Area Network) and WiMAX (Worldwide Interoperability for Microwave Access) applications. The antennas constitute of a T-shaped microstrip feed line and directly coupled strips to generate multiple bands. The proposed antennas are printed on one side of a low-cost FR4 epoxy substrate and partial ground plane (metal plane is etched partially) are fabricated on the other side of the substrate. The overall dimension of antenna is $50\times 35\times 1.6$mm³. Measured results show that the antenna1 (quad band) covers the four distinct operating bands of 320MHz (2.17–2.49GHz), 190MHz (3.31–3.50GHz), 270MHz (5.18–5.45GHz) and 700MHz (5.5–6.20GHz). Antenna2 (penta band) covers the frequency bands of 1.29–1.98GHz (center frequency 1.61GHz), 2.78–2.91GHz (center frequency 2.83GHz), 3.59–3.94GHz (center frequency 3.75GHz), 5.15–5.33GHz (center frequency 5.24GHz) and 5.39–6.06GHz (center frequency 5.56GHz). The detail antenna design and parametric analyses are discussed in steps. The characteristic of radiation pattern and gain are measured. The measured and simulated results are in good agreement. The antennas are designed using a simulation software HFSS v.15.