Global Synthesis Method for the Optimization of Multifeed EBG Antennas

Abstract

This paper presents a novel technique for synthesizing a given radiation pattern from an EBG antenna with an array feed. The method determines the optimum sets of input waves and input impedances for the feed ports in order to perform simultaneously the radiation pattern and the impedance matching of all the radiating probes that form the array feed. The method is validated through a numerical design of an EBG antenna excited with four patch antennas. The structure is designed to radiate with a single lobe scanned at in the E-plane. The interactions between each patch inside the EBG resonator are characterized with the CST MWS software. The optimum weights and the input impedances which simultaneously perform the objective radiation and the matching of all feeding ports are calculated by the developed global synthesis method. The feed network is designed with the Agilent ADS software in order to perform the specified weights and the impedances matching.

Design of a low profile end-fire antenna

“…The feed network has been designed in order to deal with the coupling. The method used to obtain the optimized weighting and input impedances is based on a synthesis procedure developed previously in the laboratory [1]. The design of the microstrip feed network has been made with the Agilent ADS (Momentum) software in order to perform the weights and the impedance matching specified in Table 1.…”

“…Our design is based on a rigorous method which synthesizes the feeds weights by considering the strong cumulative coupling between monopoles [1].…”

Design of a coupled antenna array for mobile HyperLAN2 applications

“…Other monopoles are loaded on fixed impedances that are stored for the synthesis process. The reader can refer to [8] for more details on this synthesis method. In other terms, they represent the weights that must be applied to the radiation pattern of each of the 12 monopoles.…”

“…A brief reminder of the global synthesis method from [8] is given. A brief reminder of the global synthesis method from [8] is given.…”

Power amplifiers modeling technique for reconfigurable antenna array application

“…This paper focuses on the development of a distinct and precise PA model, in order to quantify its impact on Tx-chains. However, some load impedances used for validation were calculated using an electromagnetic macro-model representing an antenna array [2], [3]. This macro-model takes into account the strong mutual coupling between the array's antennas and allows the calculation of necessary weights (amplitudes and phases), in order to obtain an optimum radiation pattern (high gain with low side lobes levels), while taking into account the calculated load impedance (ZL≠50Ω) of each antenna in the array according to the frequency and the pointing angle.…”