The folded dipole microstrip antenna has been designed to increase the operating frequency and stabilize the radiation pattern. In this study, there are three types of folded dipole microstrip antennas. The folded dipole microstrip antenna is designed of copper and coated with FR-4. After that, the three types of antennas have measured using two methods. The simulation method uses Finite-Difference Time-Domain (FDTD), but the experimental method uses a vector network analyzer (VNA). Based on the experimental results, the addition of a resonator on the second type of microstrip folded dipole antenna and a change in the size of the dipole on the third type of microstrip folded dipole antenna can reduce the error compared to the first type of microstrip folded dipole antenna. Furthermore, the addition of a resonator on the second type of microstrip folded dipole antenna can increase the gain. While the effect of changing the dipole size on the third type of microstrip folded dipole antenna can reduce the return loss.

A Dual band antenna with pattern similarity using energy squeezing mechanism of an ENZ metamaterial is designed and experimental results are presented with simulated data. In order to achieve a high gain and pattern similarity a waveguide based ENZ metamaterial property has been adopted in to planar microstrip form at upper band. The designed dual band antenna is resonating at 4.3 GHz and 9.8 GHz frequencies with desired radiation pattern. A metamaterial unit cell with ENZ characteristics at 9.8 GHz is designed to improve the antenna performance. Permittivity and Permeability of the unit cell is characterized using Nicolson–Ross–Weir method. A dual band antenna resonating at 4.3 GHz and 9.8 GHz is designed with and without ENZ unit cell to compare the radiation characteristics. Using the ENZ material's energy squeezing mechanism, a 12 dB gain improvement is achieved in the upper band without affecting the lower band radiation characteristics. The dual band antenna with ENZ material is fabricated and measured results show good match with the simulated results. The proposed antenna size at 4.3 GHz is 0.58? × 0.58? × 0.02?.

A compact low-pass filter is presented using a modified hairpin resonator to provide a wide stopband and sharp roll-off. The filter is designed for a 2.4GHz cutoff frequency, which can be used for Wi-Fi applications. The designed filter has a low insertion loss of 0.3dB and a wide stopband of 5.3GHz. The filter has a sharp roll-off of 63dB/GHz. The size of the filter is 6.1 ×19.9 mm2. The proposed filter is designed, fabricated, and tested. The measured results are in good agreement with the simulated results. The proposed filter is compact in size, has low insertion loss, is easy to design, and has a lower fabrication cost.

Design and realization of square shaped metasurface embedded ultra-wideband (UWB) antipodal tapered slot antenna (ATSA) with frequency notched characteristics is proposed in this paper. The conventional antipodal tapered slot antenna is loaded with square shaped metasurface (MS) to enhance the performance of the antenna. A quarter-wavelength long spur line on the feeding part of the UWB-ATSA contributes to a notch-filtering action which in turn can provide WLAN band rejection from the UWB spectrum of the antenna. The premeditated prototype is fabricated and characterized in connection with impedance and radiation parameter measurements compliant with the results prevailed from full wave simulation.