Abstract
A very compact and small sized 2-element planar Ultra Wide band (UWB) antenna having high isolation with band rejection characteristics designed on a FR4 substrate (23 × 26 × 0.8 mm 3 ) is presented in this paper. Each antenna element have a rectangular stepped-slot and a z-shaped slot, both etched in ground plane. The rectangular slot, proximity fed by a 50 Ω micro-strip transmission line, acts as a main radiator while z-shaped slot acts as a filter for rejecting the full WLAN band (5.15-5.85 GHz). Use of an inverted T-shaped slot near top end of ground plane improves isolation more than 24.5 dB in lower UWB band i.e. 3-5 GHz, while the rectangular vertical slot etched at center of the ground plane near the bottom edge reduces the mutual coupling at lower as well as at higher UWB band i.e. 5 - 10.6 GHz. Both measured and simulated results are presented which are found generally in good agreement.
Highlights
Ultra-wide band (UWB) system has got much consideration due to the increasing requirement of high data rates and channel capacities without deploying extra bandwidth and transmission power [1]
It is clear from the graph that radiating slots have covered the complete ultra-wide band from 3.1 GHz to around 10.6 GHz, with band stop filtering effects at WLAN band i.e. 5-6 GHz
A compact UWB-Multiple-Input Multiple-Output (MIMO) antenna with compact size and highest achieved isolation is proposed for portable UWB devices
Summary
Ultra-wide band (UWB) system has got much consideration due to the increasing requirement of high data rates and channel capacities without deploying extra bandwidth and transmission power [1]. The compared parameters include overall size, UWB band covered, notched bands, minimum isolation between antenna ports, efficiencies in the notched and working bands and gain range in dB in working bands. Our proposed antenna has the smallest size as compared to those existing antenna designs reported earlier, i.e. 23 × 26 mm (0.39λ × 0.44λ) = 598 mm, where λ is wavelength of the lowest frequency, having very low efficiency in the notched band with a higher minimum isolation of −24.5 dB between ports of two antenna elements. For obtaining band-notched characteristics, a stepped z-shaped slot is etched below main radiating slots in the ground plane This filtering technique helps in better suppression of undesired radiations at WLAN band with the minimum efficiency of just 7%
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