A reconfigurable multiband rhombic shaped microstrip antenna for wireless smart applications

This article proposes a reconfigurable multiband rhombic shaped microstrip antenna (RMRS‐MSA) up to 20 GHz based on wireless smart applications. In this article radio frequency (RF) PIN diodes are loaded with microstrip feed line on radiating patch for frequency switching. It has a rhombic shaped copper loaded radiating patch. This radiating patch has two more connected rhombic patches inside with a 1 mm gap named as radiating patch 1 and radiating patch 2. These rhombic shaped radiating patches are enclosed with a square parasitic patch for achieving directional radiation pattern. A prototype of reconfigurable multiband rhombic shaped reconfigurable MSA is fabricated using a 30 × 30 mm2 on FR‐4 substrate with a dielectric thickness of 1.6 mm. The proposed RMRS‐MSA is designed, fabricated, and experimentally validated. The experimental report at center frequency 5.21, 9.41, 10.46, 12.69, 14.39, and 17.09 GHz have reflection coefficients of −16.89, −25.54, −24.86, −28.62, −26.80 and −43.02 dB, respectively, when all diodes are OFF. Similarly, when all diodes are ON, at center frequency 14.57 and 15.18 GHz have reflection coefficients of −26.15 and −28.99 dB, respectively. The measured and simulated results agree well. The proposed antenna is more suitable for C, X, and Ku band‐based applications.