Miniaturized bent slotted patch antenna over a reactive impedance surface substrate

Abstract

A reactive impedance surface (RIS) based miniaturized bent slotted patch antenna is proposed and investigated for S-band applications around 2.39 GHz. Bent slots in the patch reduce the patch antenna size by increasing current path on the patch. Further a RIS substrate with cross-shaped patch elements printed over a grounded dielectric is optimized and investigated for antenna miniaturization. The proposed bent slotted patch antenna over RIS substrate is 38.75% miniaturized with respect to traditional patch antenna at a fixed operating frequency. The proposed antenna reveals an overall volume of 0.280λ0 × 0.280λ0 × 0.036λ0on a low-cost FR4 substrate at 2.39 GHz for S-band applications. The proposed antenna is fabricated and measured for its return loss. The measured results are in good agreement with simulated one.

Meander line‐based low profile RIS with defected ground and its use in patch antenna miniaturization for wireless applications

“…On comparing Figure (a) with Figure (a), it is observed that two meander line structures are removed from the vicinity of the feedline to reduce the coupling of the RIS with the feedline which accounts for spurious radiation. From previous literature , it is observed that better miniaturization has been achieved using RIS having substrate thickness higher than that used in our work. This increases the profile of the structure and also increases its weight.…”

“…The simulated gain and efficiency of the proposed structure are 5.82 dBi and 79%, respectively. To highlight the significance of defected ground of the RIS, a comparison of the proposed structure with previous works is tabulated in Table . From the table, it is found that the proposed technique is able to provide maximum miniaturization by using RIS substrate of minimum thickness (for multiband structures the frequency where maximum miniaturization is obtained is referred to).…”

“…(c)] while keeping all other parameters unchanged, the resonating frequency shifts left thus enhancing the effect of miniaturization as illustrated in Figure . This characteristic is of particular interest since the proposed RIS structure is able to tune the resonating frequency of the structure whereas in previous literature there has been no mention about any controlling parameter of the RIS to vary the resonance of the structures. Other parameters of the slot have minor effects on the impedance matching and back radiation of the structure.…”

“…When the HIS is used in these frequency regions, it is termed as reactive impedance surface (RIS). RIS has been used for bandwidth enhancement and miniaturization of patch antenna .…”

Miniaturized curved slotted patch antenna over a fractalized EBG ground plane

“…For improving the radiation efficiency an air gap was also introduced with in the structure, but structure became complex and non-planar. A number of antennas inspired by reactive impedance surface (RIS) in combination with slots, complementary split-ring resonators (CSRR), and other meta-material structure have been proposed to design smaller antennas [7–10]. In [11], a Hilbert shaped RIS and Wunderlich-shaped fractal CSRR were utilized for size reduction with low substrate thickness.…”