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This paper addresses the multiband patch antenna design using an improved straightforward method based on genetic algorithm. Starting from a random matrix of squared pixel shapes, the GA optimizes the final design in order to obtain desired specifications, for instance: good impedance matching in required frequency-bands and rejection of undesired bands by integrating appropriate filter. The program is implemented with visual basic script integrated in CST software. The method overcomes the classical design way since the optimized design can be automatically achieved without interfering with designer (independent conception). Validation of the proposed procedure is carried out through simulations and measurements of two patches (dual and tri-band) for WiMAX, WLAN, and X-band applications. Obtained results are in good agreement and demonstrate the effectiveness of the proposed design method. [ABSTRACT FROM AUTHOR]

This paper describes the design guidelines for frequency independent 180° phase shifters. The proposed configuration is based on microstrip slot transition technique. The frequency independence feature is due to comparing two quasi‐identical structures and the phase inversion (180°) is related to the chosen inverted orientation of the main line compared to the reference one. Moreover, two different schemes are designed and manufactured and a good simulation to measurement agreement is demonstrated. Thus, interesting results are obtained (more than 10 dB return loss, less than 2.1 dB insertion loss and less than ± 3.6° phase deviation). [ABSTRACT FROM AUTHOR]