Development of SIW LWA from Non-Uniform CRLH Unit Cells with SLL Reduction

A Compact Non-Uniform Composite Right/Left-Handed Leaky-Wave Scanning Antenna With Elliptical Polarization for X-Band Application

“…According to the results of previous investigations, the highest gain and at the same time low-level SLL and a small radiator length demonstrated nonuniform CRLH [11] and nonuniform periodic LWAs based on SIW [13]. However, their lateral dimension can be considerably diminished in the case of HMSIW use.…”

“…The curves of dispersion characteristics β and α, depicted in Figs. 3(a)-3(d), were obtained by substituting the found S-parameters values into the following expressions [9,11]:…”

“…Thereby, it represents construction based on metamaterials composed of periodically arranged inductances and capacitances in the unit-cell of TL [8]. In [9][10][11][12], various CRLH LWAs were presented (period of the unit cell < λ g /4), employing all of the advantages of SIW-technology, where OSB was suppressed by attainment of the balanced condition of the unit cell. Thus, a wide scanning angle was provided in both directions.…”

“…A SIW leakywave structure for polarization-flexible antenna application was proposed in [10]. The development of SIW LWA from nonuniform CRLH unit cells with SLL reduction was employed in [11]. A structure of CRLH TL unit cell in [9][10][11] was provided by the arrangement of the series interdigital capacitor (IDC) in the form of a meander type slot line on the top wall of SIW.…”

“…The development of SIW LWA from nonuniform CRLH unit cells with SLL reduction was employed in [11]. A structure of CRLH TL unit cell in [9][10][11] was provided by the arrangement of the series interdigital capacitor (IDC) in the form of a meander type slot line on the top wall of SIW. A miniature frequency-scanning HMSIW LWA with CP was reported in [12].…”