A novel reconfigurable microstrip slot antenna with capability of switchable frequency notched bands for ultra‐wide‐band (UWB) applications is presented. The feed line is tapered to provide UWB matching condition. Two parasitic elements are attached to two sides of patch having a square slot for improvement of frequency band response. An inverted Γ‐shaped parasitic element is placed inside the slot in patch to produce a notch at wireless local area network (WLAN) frequency band (5.1–5.7 GHz). A rectangular split ring resonator is placed on the back side of microstrip slot antenna to produce a notch at downlink X‐band for satellite communication systems (7.2–7.8 GHz). Reconfigurability of proposed antenna is obtained by placing PIN diodes at appropriate places to achieve four different operations, namely UWB coverage, UWB coverage with single band notch at WLAN, UWB coverage with single band notch at downlink X‐band and UWB coverage with double band notch at WLAN and downlink X‐band. The first case achieves fractional bandwidth of 123% (3.1–13 GHz). Antenna performance is studied in frequency and time domains. The bias circuits of PIN diodes are placed on antenna structure and are considered in simulations. A prototype model of proposed antenna is fabricated and measured to demonstrate its desirable features.
A new design of frequency reconfigurable planar coplanar waveguide‐fed array antenna for multiband MIMO (multi‐input–multi‐output) applications is presented in this study. The proposed two elements MIMO array antenna consists of two identical basic reconfigurable antenna elements. Each basic antenna structure consists of two quarter‐wavelength resonators and is capable of operating in WLAN (wireless area network) and WiMAX frequency bands. The centre frequencies of the operating bands are controllable independently by tuning the length of the corresponding resonators. Employing switches on the proposed structure has led to three different switchable operations [WiMAX (3.36–3.7 GHz), WLAN (5–5.8 GHz) and WiMAX and WLAN (3.17–3.77 and 5.13–5.88 GHz) simultaneously]. Moreover, by arranging the antenna elements in an orthogonal alignment in space and using polarisation diversity technique, the multipath performance of the presented MIMO antenna is improved. The fabricated reconfigurable MIMO antenna has a compact size of 48.5 × 25 mm2 while having more than 16 dB isolation level between its ports for all its various switchable performances. The measured results reveal that the proposed antenna can be a good candidate for modern multiband MIMO applications.
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