Theoretical and experimental characterisation of CPW-fed microstrip antennas

The Weighted Averages Algorithm Revisited

“…After an intensive and thorough comparison with other algorithms, Michalski concluded that "the W-transformation and the weighted averages method emerge as the most versatile and efficient currently known convergence accelerators for Sommerfeld integral tails". Although prior to 1998, WA had been already known in specialized circles and had been successfully used [7]- [9], it was the weight of Michalski's work that gave it a serious push and launched WA as the most popular technique for the numerical evaluation of Sommerfeld and related integrals. Nowadays, the main application of WA is the computation of Green's functions (or of Method-of-Moments matrices entries) in the integral equation formulation of multilayered problems.…”

CPW-Fed Stacked Microstrip Antennas

“…It avoids problems associated with large probe self-reactances and facilitates the construction process [1], which is freed from soldering points leading to unwanted parasitic effects. Hence, this technique provides lower parasitic radiation, and the centered feed provides greater radiation pattern symmetry [2]. Variation of the aperture dimensions facilitates impedance matching [2].…”

“…Hence, this technique provides lower parasitic radiation, and the centered feed provides greater radiation pattern symmetry [2]. Variation of the aperture dimensions facilitates impedance matching [2]. It is known that the coupling of several resonances leads to a significant increase in bandwidth, which is desired in many applications in the field of telecommunications.…”

“…Recently, the use of CPW as an alternative to microstrip line feeding has been increasingly explored. Until now, there have been a few papers describing microstrip antennas fed by a CPW terminated in an excitation slot, mostly though single patch antennas [2], [5]- [9]. The advantages of Manuscript CPW over microstrip line are low dispersion, good characteristic impedance control, and easy integration with shunt lumped elements and active devices [10].…”