This study introduces an original theoretical approach for rectangular microstrip antennas analysis and design. The purpose method consists in the coupling between artificial neural networks tool applied to the analysis of rectangular antennas and a tabu search for the optimization. A neural network acting as database will allow to reduce strongly the computation time. This method will be illustrated in four examples.

The results of a recent investigation of a high‐gain microstrip reflectarray are presented. The substrate–superstrate resonance technique is used to increase the reflectarray gain. The measured gain is increased by 5 dB when the superstrate layer is added. Gain and radiation patterns are discussed. In order to use this technique in reflectarrays with phase‐control elements, the analysis and discussion of the phase reflected by a particular unit cell made up of a slotted and grounded patch are presented. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 152–154, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20928

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respectively. In the Figure 8A,B, the simulation results for S 11 and S 41 are 44.1 and 37.6 dB and the measurement results for S 11 and S 41 are 42.9 and 36.6 dB, respectively. Table 5 shows the is on for comparison for dimension size of the proposed HBC and other HBCs. In the table, the proposed HBC size is reduced the 83% then conventional HBC (see Figure 1). 1,10,11 | C ONCL US I ONIn general, the kg/4 transmission-line (TL) is used for HBC in the microwave system. The dimension size of the conventional kg/4 TL is increased at the low frequency band due to long wavelength. In this article, the new compact-size of the TL usingp-type parameter is suggested and it applied to the design of a HBC. In this characteristic, the HBC is very small size than conventional HBC and the size of the new and conventional HBCs are 9.86 3 11.1 mm 2 and 28.2 3 28.6 mm 2 , respectively. The new structure of the HBC is used by whole distributed elements. The advantage of the proposed HBC structure has very simple structure and low cost. Also, the proposed HBC consists of planar structure. Thus, the proposed structure can also be adequate in a monolithic microwave integrated circuit fabrication due to planar structure. The proposed HBC using p-type TL can be applied to mobile communication system. ORCID Ki-Cheol Yoon AbstractThis Letter reports a comparison between shunt-series inductance (SSI) and inductively coupled loop (ICL) matching circuits for ultra high frequency (UHF) Radio Frequency IDentification (RFID) tags. It is shown analytically that an optimized ICL circuit is fully equivalent to an optimized SSI circuit provided that some adjustments are made on the dipole antenna geometry. Numerical and GOURARI ET AL. | 1763

mum is in the end-fire direction with higher cross-polar level and a gain of 3 dBi is observed over the VSWR BW. The area of the proposed compact MSA is 15 cm 2 , which is only 6% of the corresponding unslotted RMSA, which results in a better BW but a reduced gain. CONCLUSIONA compact variation of the RMSA with a half U-slot, which reduces the antenna area by half, has been proposed. The BW enhancement of compact shorted SMSAs was obtained by cutting a quarter-wavelength stepped U-slot, which gives a BW of more than 20%. DESIGN OF A THINNED MICROSTRIP-