Abstract-Analysis of U-slot loaded patch stacked with H-shaped parasitic elements is given in this paper. It is found that the antenna exhibits dual resonance and both the resonance frequency (upper and lower) depends directly on slot width and inversely on slot length. Both upper and lower resonance frequency increase with increasing the value of h 2 . Typically the bandwidth at lower and upper resonance is found 3.66% and 10.25% respectively. The radiated power at higher frequency (beamwidth 64 • ) is 0.73 dB as compared to lower resonance frequency (beamwidth 71 • ). The theoretical results are compared with the simulated data obtained from IE3D.

In this article, analysis of V‐slot loaded patch antenna is proposed using equivalent circuit model. Such antenna provides a wide bandwidth which depends inversely on the base width and slot thickness. The proposed results are compared with experimental and simulated results which are in good agreements. Radiation pattern of the proposed antenna is in good agreement with the simulated results. This validates the accuracy of the proposed model. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 3069–3075, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23891

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The analysis of V‐slot loaded antenna stacked with simple patch is carried out using equivalent circuit model. It is found that stacked patch antenna exhibits enhanced bandwidth that depends on various dimensions of the V‐slot. The proposed theoretical results are compared with simulated and reported experimental results which are in good agreement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 324–330, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24031

In this paper, the physical origin of interferences has been explored in a four-level cascade rubidium atom by simultaneous interaction with three energies; two optical fields and one radio frequency (RF) field. The atomic system is investigated by a combination of the analytical method introduced by Zhu et al (2010 Phys. Rev. A 81 053836) and resonant pole method introduced by Anisimov (2008 J. Mod. Opt. 55). A substantial amount of variation in the probe absorption has been observed in various regimes. The transition from electromagnetically induced transparency (EIT) to Autler-Townes spitting (ATS) is observed. It is found that a definite threshold value exists governing the crossover from EIT to ATS. The applied analytical method gives a clear insight into the nature of interferences; one may observe EIT as a consequence of destructive interference, whereas ATS is a consequence of constructive interference. Furthermore, a transition from single EIT to double electromagnetically induced transparency has been detected when the system is illuminated by RF-driving field in weak control regime. Further, transition from ATS to double Autler-Townes splitting has been observed in the strong control regime.