Parametric study and temperature sensitivity of microstrip antennas using an improved linear transmission line model

Determination of resonance frequency of hexagonal and half hexagonal microstrip antennas

“…But, these expressions for CMSA do not take into account the dispersion effect, unlike those available for RMSA [3,4]. Also, it is mentioned for CMSA, that for a thin substrate, eff should be used, and for a thick substrate r should be used in the resonance frequency formula, but a well-defined boundary as up to what substrate thickness eff should be used, is not defined [4,7].…”

Hybrid-coupled broad-band triangular microstrip antennas

“…The feed point location to match with 50 co-axial feed was computed to be 3.9 cm from the vertex using improved linear transmission line model [6]. The measured bandwidth was 40 MHz at 1.650 GHz against the theoretical value of 38 MHz at 1.655 GHz.…”

“…A single ITMSA was first fabricated with reduced side length a = 5:25 cm with height = 5 cm, which is same as that of the ETMSA. For the feed point at x = 1:8 cm, the measured and calculated resonance frequencies using improved linear transmission line method [6] are 1.695 and 1.680 GHz, respectively, and the corresponding bandwidths are 39 and 36 MHz, respectively.…”

Qualitative Model of the Input Impedance of Rectangular Microstrip Antenna

“…Basically, there are two models for analysis of such structure including exact and approximate models. The first ones such as method of moments (MoM) [3] on one hand lead to accurate predictions, but they are complex and time consuming specially over wide frequency band, the second ones such as transmission line model (TLM) [4][5][6] on the other hand is simple, but leads to considerably errors in wide frequency band. To remove the above drawbacks, intelligent models such as neural networks (N.N) and neural-fuzzy systems (N.FS) [7][8][9] can be used.…”