Multiband miniaturisefrequency reconfigurable patch antenna using PIN diodes

The proposed manuscript represents the novel approach to achieve the frequency reconfigurability of the microstrip patch antenna. The tunability is achieved with the FR-4 based low profile material using the PIN diodes. Performance is compared for the simple patch antenna, radome based patch antenna without metamaterial elements and differently shaped metamaterial elements. The presented design provides a minimum reflectance response of −52.20 dB for the reconfigurable circular-shaped metamaterial ring loaded patch antenna. The maximum bandwidth of 5160 MHz is achieved for the circular-shaped metamaterial ring loaded patch antenna. The maximum gain of 2.93 dB is achieved in the radome based patch antenna without metamaterial elements. Maximum tunability of 80 MHz is achieved. The maximum normalized directivity of 110° is achieved with the Square shaped metamaterial ring loaded patch antenna. Simulated results compared with the measured results for the confirmation.The presented design opens new applications in satellite communication, surveillance, wifi devices and manymore. The performance of the presented design also compared with the earlier published work.