Open AccessOne‐dimensional leaky‐wave antenna with scanning through the broadside based on sinusoidally modulated reactance surface
Author(s) -
Montaseri Nasser,
Mallahzadeh Alireza
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5497
Subject(s) - stopband , broadside , reactance , antenna (radio) , attenuation , acoustics , optics , leaky wave antenna , frequency band , electrical impedance , passband , electronic engineering , physics , engineering , resonator , electrical engineering , microstrip antenna , band pass filter , voltage
A dispersion diagram (DD) and radiation property in a wide‐band frequency range are considered for a periodic leaky‐wave antenna (PLWA) based on artificial reactance surface (ARS). In the first step, the surface impedance versus gap spacing over a wide frequency band is obtained using full‐wave simulation results. In the second step, the frequency dependency effect of ARS on DD of PLWA in the special frequency band is theoretically analysed. The new DD provides a simple way to analyse the radiation beam angle in a wide frequency band for these types of periodic structures. To mitigate and almost eliminate the open stopband, special parameters of sinusoidally modulated ARS are theoretically analysed and the results show how to achieve minimum variations in attenuation near the broadside. By nearly eliminating the open stopband's behaviour, the proposed antenna is able to scan through the broadside without any rapidly varying attenuation. Simulation and measurement results of the proposed antenna validate the theoretical analysis.