CAD Model to Predict the Effect of Radome on the Characteristics of Rectangular Patch Antenna

Abstract

A simple CAD model based on cavity model analysis is proposed to compute accurately the resonant frequency, input impedance, and gain of radome loaded rectangular patch antenna. The computed values using present model for wide range of radome parameters are compared with different theoretical and experimental values available in open literature. To validate the present model, we have performed several sets of experiments. The present model shows very close agreements with the experiments compared to the other models. We have also used electromagnetic software (HFSS) to generate simulated data. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2460–2468, 2013

Li's Formula Extended to Determine Accurate Resonant Frequency of a Rectangular Patch Antenna in Multi-Dielectric Layers

“…The article in [22] shows experimentally that the resonant frequency decreases monotonically with the increase of superstrate thickness. The simulation results (HFSS and CST) also support the same nature of previously reported theoretical [15][16][17][18][19][20][21] and experimental results [22]. However, the computed resonant frequency using the model [6] shows opposite nature with cover layer thickness which is incorrect.…”

“…Thus the accurate computation of resonant frequency is very essential to use properly the patch antenna as a sensor. Recently, the patch antenna in multi-dielectric superstrate layer draws much attention of the researchers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The resonant frequency mainly depends on effective permittivity of the microstrip structure, effective length and width of the patch.…”

“…In order to calculate the resonant frequency of a rectangular patch in multi-dielectric layer, the conformal mapping technique has been employed in [1,5,[13][14][15][16][17]. Among them [1,[13][14][15][16] employed an approximate capacitance formula and erroneous filling fraction arrangements for effective permittivity computation. Also they [13][14][15][16] have not incorporated the effect of surface wave and leaky wave in effective length calculation.…”

“…Among them [1,[13][14][15][16] employed an approximate capacitance formula and erroneous filling fraction arrangements for effective permittivity computation. Also they [13][14][15][16] have not incorporated the effect of surface wave and leaky wave in effective length calculation. Later on two efficient conformal mapping approaches were reported in [5,17].…”

“…It is also valid for a higher permittivity multilayered structure. However, the model [6] still has some drawbacks: (i) they incorporated the fringing field effect twice in effective length calculation which is theoretically incorrect; (ii) they did not consider the effect of leaky wave modes in effective length computation; (iii) the previous models [15][16][17][18][19][20][21] reported that the resonant frequency of a rectangular patch antenna in multi-dielectric layers decreased with the increase of dielectric cover layer thickness. The article in [22] shows experimentally that the resonant frequency decreases monotonically with the increase of superstrate thickness.…”