Meandered low profile multiband antenna for wireless communication applications

The compact slotted antenna having offset feed radiating in the multi-frequency bands is proposed. The antenna geometry comprises of a vertical and horizontally coupled slotted structure at the top with a complete ground plane at the bottom to achieve the proposed application bands. The patch is patterned on the FR4 substrate having a dielectric constant of 4.4 and loss tangent of 0.008. The antenna has an overall dimension of 0.18 lambda x 0.15 lambda mm(2)(f = 1.52 GHz) with offset fed which is optimized to achieve 50 ohm impedance matching. The proposed compact antenna resonates in pentaband frequency bands which includes 1.52-1.60 GHz for GPS (ISM band in India), 2.97-3.02 GHz for Radio frequency identification and detection, mobile communication, logistics, manufacturing, transportation and healthcare, 3.73-3.84 GHz for Amateur Fixed Mobile except aeronautical mobile (R), 4.42-4.52 GHz for radio communications, TransferJet USB Adapter (Toshiba Corporation), and 4.83-4.96 GHz for Aviation Private Land Mobile applications. The proposed antenna has demonstrated a decent gain ranging from 1.07 to 3.92 dBi having omnidirectional and bidirectional radiation patterns, hence, making it suitable for various wireless applications.