Abstract
This paper presents a patch loaded slot antenna for super wideband (SWB) application. To obtain SWB characteristic, the proposed antenna geometry combined a rectangular slot and an overlying patch excited by a trident shaped microstrip feed. It is observed that the hybrid nature of the proposed antenna effectively enhances the impedance bandwidth up to 120%, by combining the resonance of both patch and slot. Besides, it is investigated that after converting the conventional tapered feed into the trident shape feed, the impedance bandwidth is increased further from 120 to 167% ranging between 1.25 and 15 GHz. Moreover, one U-shaped slot and two L-shaped stubs are inserted into the antenna design to introduce the dual-band rejection property from 1.8 to 2.4 GHz (GSM 1800, Wi-Fi 2.1 and 2.4) and 3.1–4.2 GHz (WiMAX and C-band). Further, to validate the simulation results a prototype is practically constructed and tested. The measured result demonstrates that the designed antenna offered an impedance bandwidth of 170.3% from 1.2 to 15 GHz. Both frequency and time domain analysis ensure the suitability of the designed antenna for SWB applications.
Highlights
Rapid evolution in wireless communication builds a huge demand for the super wideband (SWB) antenna to support a very high data transmission rate
Unlike UWB, no specific frequency band is allotted for SWB technology
Some narrow frequency bands co-located within UWB and SWB range like WiMAX (3.3-3.6 GHz), downlink of C-band (3.7-4.2), Wi-Fi 2.1 and 2.4 GHz may degrade the performance of SWB antenna by causing undesired electromagnetic interference from these coexisting bands
Summary
Rapid evolution in wireless communication builds a huge demand for the super wideband (SWB) antenna to support a very high data transmission rate. Unlike UWB, no specific frequency band is allotted for SWB technology. It has an extremely wide bandwidth, which can completely cover many frequency bands like GSM-900, 1800, Wi-Fi, and entire UWB simultaneously. One way to reduce their interference is to connect several band stop filters with SWB antennas; it will increase the system complexity and size tremendously. Another method is to design the SWB antenna with band notch characteristics without affecting the size and complexity. In order to cover lower frequency applications with broadband behavior, several SWB antenna has been proposed in the recent past [7]-[13]. The reported works covered most of the lower frequency band, but not ensured band notch characteristics
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