Continuous hybrid approach to the modified resonant frequency calculation for circular microstrip antennas with and without air gaps

Abstract

In this work, a continuous hybrid approach (CHA) to the modified resonant frequency calculation for circular microstrip antennas with and without air gaps is presented. The results obtained by the CHA for different antenna dimensions and modes of resonance are compared with the experimental and theoretical results given in the literature. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 40: 423–427, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11399

Computation and optimization of resonant frequency and input impedance of a coax‐fed circular patch microstrip antenna

“…The average percentage error of theories of Gurel and Yazgan [6 -8] is around 0.36%. The following theory presented by Guha [9], produced from new dynamic permittivity and radius extension formula, results with average percentage value of 0.57 and the recent theory presented by Gunel [10], produced from continuous hybrid algorithm depending on continuous parameter genetic algorithm, results with an average percentage error value of 0.28. In the last column of Table 1, the resonant-frequency results of the present study, f GAY , are shown.…”

“…Experimental [2] and theoretical [1][2][3][4][5][6][7][8][9][10] [3], Roy and Jecko [4], Guney [5], Gurel and Yazgan [6 -8], Guha [9], Gunel [10], and the present formulation, which are mainly produced from the cavity analysis depending of the usage of effective or dynamic permittivity values combined with effective or physical patch radius values. Average percentage error values are also shown in the same table indicating the accuracy is affected mainly by the gap thickness and the mode numbers.…”

“…In the optimization, probability of uniform crossover is fixed at 0.7 and probabil- Widths, a ‫؍‬ 50mm, h 1 ‫؍‬ 1.59mm, and r2 ‫؍‬ 2.32. (a) h 2 ‫؍‬ 0, (b) h 2 ‫؍‬ 0.5mm, and (c) h 2 ‫؍‬ 1.0mm Mode f meas [1] f Lee [1] f Dah [2] f Abb [3] f Roy [4] f Gün [5] f Gr1 [6] f Gr3 [8] f Gr2 [7] f Guh [9] f Gnl [10] f GAY ity of mutation is taken as p mut ϭ 0, since the mutation operator is not used in the microgenetic algorithm as in Ref. 14.…”

“…As an alternative, double-layered structure with air gap having adjustable thickness between the substrate and the ground plane is also found to be useful in obtaining the wide band operation. For both single and double-layered structures, accurate computation of resonant frequency is an important task and takes considerable interest in literature by various authors depending on the usage of various methods and approximations [1][2][3][4][5][6][7][8][9][10].…”

Full-Wave Analysis of Anisotropic Circular Microstrip Antenna With Air Gap Layer

“…Bandwidth of microstrip antenna can be increased by designing the antenna with an air gap [1,4]. In order to obtain tunable characteristics, providing a wider bandwidth at the same time, a simple solution was proposed in the literature [5][6][7][8][9][10]. This was the inclusion of an adjustable air gap between the ground plane and the substrate resulting in a two-layered structure having new resonant frequency value [7].…”