Series-fed-type linear arrays of dipole and slot elements transversely coupled to a microstrip line

Short dual‐band planar leaky‐wave antenna with broadside effect mitigation

“…Therefore, this novel slot element paves the way for novel functionalities in planar slot arrays, such as multiband behaviour. Indeed, there have been few examples of microstrip series‐fed arrays based on slots and those that appear in the literature have pursued single‐frequency shaped‐beam, instead of frequency‐scanning [10, 11]. This can be partly due to the bandwidth limitation imposed by the resonant nature of the slots.…”

Analysis of series-fed slot antenna arrays transversely coupled to a microstrip line including mutual coupling effects

“…It is well known that a slot antenna positioned perpendicular to the microstrip feed line can be modeled by a series impedance whose value is determined by the offset (x) and the length of the slot (l). For the characterization of the slot impedance in terms of these two parameters two different approaches can be found in literature [1,2]. In the classical paper of Pozar [1], the fullwave analysis of the slot antenna is performed by the spectral domain Method of Moments (MoM) technique and the impedance value is obtained via reciprocity theorem.…”

“…A similar analysis technique is also applied in [3] and the variation of slot impedance with the thickness and permittivity of the dielectric substrate is studied. On the other hand, in [2] the slot characterization is done experimentally by utilizing the TRL calibration technique and an 8 element linear array is designed through the use of the transmission line theory with each slot modeled as a series impedance. Compared to calculated values, 1-2 dB increase in near sidelobe levels and about 5 dB increase in the far sidelobe level are observed in the measured radiation pattern reported in [2].…”

“…On the other hand, in [2] the slot characterization is done experimentally by utilizing the TRL calibration technique and an 8 element linear array is designed through the use of the transmission line theory with each slot modeled as a series impedance. Compared to calculated values, 1-2 dB increase in near sidelobe levels and about 5 dB increase in the far sidelobe level are observed in the measured radiation pattern reported in [2]. This increase in the sidelobe levels may be attributed to mutual coupling effects since they are not considered in the aforementioned study.…”