This article is based on dual fractal techniques to design the Koch–Sierpinski Fractal Microstrip (KSFM) antenna for wireless applications. The concept of the Koch fractal is applied on the outer periphery of the square-shaped patch and Sierpinski gasket concept on the inner segment of the square-shaped patch to reduce the effect of surface currents. The antenna design involves two degrees of iteration using dual fractal techniques. The antenna is simulated using HFSS software and fabricated. The measurements of antenna parameters are done using a vector network analyser (VNA). The proposed antenna covers multiband resonant frequencies of 5.699 GHz, 10.108 GHz, 11.100 GHz, 15.812 GHz and 17.621 GHz for C-band (4–8 GHz), X-band (8–12 GHz) and Ku-band (12–18 GHz) applications. The antenna achieved better bandwidth at high range of frequencies. Three different substrates were chosen to compare the results of the proposed antenna (Fr4, Rogers RO 4003 and Rogers Ultralam) with the Fr4 substrate achieving the best results. The simulation agreed well with those obtained experimentally.

The cross slot loaded patch antenna with inset feed is designed and fabricated on FR4 substrate to get deca band. This proposed antenna consists of a cross slot on a rectangular patch with inset feeding, on a dielectric substrate. The simulated results of proposed antenna have ten resonating frequencies (2.30, 3.90, 5.30, 6.10, 8.70, 10.0, 12.9, 14.10,16.20, 19.0 GHz) while measured results of proposed antenna have eleven resonating frequencies (2.3089, 4.1079, 5.3073, 6.2069, 8.8056, 10.1050, 11.8041, 12.5038,14.3028, 16.1019, 19.1004 GHz). The frequency bands are useful for S band, C band, X band, Ku band, K band and for LTE applications. Frequency bands like 2.30, 5.30, 8.70 can be useful for LTE applications while other frequency bands can be used for different applications such as WIFI, WiMAX, satellite communication, radar communication etc. The simulation for desired antenna is performed with the help of software HFSS.

A multi-band horizontal wide U-slotted patch antenna is proposed for wireless communication. Along with the horizontal wide U-slot, the proposed antenna also consists of four truncated corners along with inset feeding for proper antenna matching. The proposed antenna design has three distinct simulated resonating frequencies i.e., 4.7 GHz, 6.8 GHz and 9.8 GHz having -10 dB return loss band width as 111.1 MHz, 245.1 MHz, 998.6 MHz respectively while measured resonating frequencies are observed as 4.75 GHz, 7.1 GHz and 10.2 GHz having -10 dB return loss band width as 539.1 MHz , 410.6 MHz , 2.0834 GHz respectively . The proposed antenna results are examined using High frequency structure simulator tool and then verified through measured results . Thus, the proposed antenna is applicable for frequency bands like S band, C band and X band .