In this paper, a novel study on the design and analysis of a compact printed antenna for multi-band applications are presented. The structure of the entire area is 45×45.5 mm ² and is printed on an FR-4 epoxy substrate. It is suitable for GSM/GPS/PCS applications by using an M-shaped antenna which is formed of different arms and an L-shaped shorted strip connected between the feeding line and the ground plane. Simulation results of the antenna input impedance bandwidths for, S11 ≤ (-10) dB, show that it covers the GSM, GPS and PCS bands. Also, a stable radiation pattern and an average antenna “Advanced Design System”. Also, we have conducted another study by using CST-MW to compare the results obtained with ADS which give good agreement between the both EM solvers.

In this work, a microstrip antenna array that consists of 16 elements is designed at a frequency of 28 GHz, with a dimension of 35 mm × 33.5 mm and an operational bandwidth of 27.7–28.3 GHz. The idea is putting two antenna arrays next to each other on the same substrate and ground plane, as well as minimizing the overall size. This work presents a mutual coupling reduction for two arrays and studies the performance of the antennas through the suppression of surface wave propagation in a given frequency range. It proposed a new configuration for an artificial magnetic conductor (AMC) created by microstrip technology placed at a closed distance (0.3${\lambda }_0$) between the two antenna arrays. The improvement in the isolation between the two adjacent antenna arrays was studied according to the H-plane with a periodic unit cell of the AMC. The mutual coupling reduces to −40.0 dB at the operation frequency and isolation of 17 dB. The antenna array is also characterized by a good envelope correlation coefficient (ECC). The CST Microwave Studio electromagnetic solver was used to design, improve, and miniaturize the proposed configuration.

In this paper, a new proposed design is presented for UHF RFID antenna matched to the Moroccan frequency band authorized by the ANRT. A proposed structure is inspired from circular split ring resonator theory, the geometry of the RFID antenna is double sided. Front side presenting a modified SRR while the back side is a circular ground plane. In order to achieve a good matching input impedance between the antenna and the impedance of the UHF chip, the structure is combined a modified SSR with stubs. The EM simulation of the proposed antenna done by EM Solver on an FR-4 substrate. The use of SRR permit to obtain good results of simulation with a reflection coefficient about-26,146dB at the Moroccan frequency band around 868MHz , a good read range and reduced size of RFID antenna were obtained with physical dimensions of 32×18×0.87𝑚𝑚 3 which presents 62.9% in comparaison with diemnsions of λ/4 length.

A Two-stages Microstrip Power Amplifier for WiMAX Applications