Development of Multilayer Partially Reflective Surfaces for Highly Directive Cavity Antennas: A Study

Table 3

Comparison of the proposed antenna with few existing designs.

Reference	Feed antenna	Frequency (GHz)	No of layers	Array size	% S11 bandwidth	% 3 dB gain bandwidth	Gain (dBi)	Size (mm^3)
[4]	Slot-coupled patch	16	2	NA	25	25.8	15	2.5λ × 2.5λ × 1.4λ
[6]	Strip-fed dual-slot	2.4 and 5	2	6 × 6	16 and 11.7	7 and 11	14.9 and 14.2	1.3λ × 1.3λ × 0.45λ2.4GHz 3λ × 3λ × 1λ5GHz
[11]	Aperture slot	80	2	8 × 4	10	NA	10	26.5λ × 26.5λ × 1.2λ
[13]	Waveguide slot	14.5	3	5 × 5	10.3	15	20	4λ × 4λ × 1.8λ
[15]	Patch	5.8	1	6 × 6	3.4	NA	9	2.39λ × 2.39λ × 1.2λ
[16]	CP patch with shorting pin	5.8	1	5 × 5	NA	2.58	12.9 and 12.8	3λ × 3λ × 0.55λ
[17]	Patch	13	1	12 × 12	1.56	8.5	13.6	3 × 3 × 0.65λ
[18]	Aperture-coupled CP patch	4.8	3	6 × 6	30	29	14.2	1.6 × 1.6 × 0.6λ
[19]	Loop rectangle patch	2.1and5.8	1 (dual-sided)	17 × 17	NA	NA	6 and4.5	1.01 × 1.01 × 0.09λ2.1GHz 2.79 × 2.79 × 0.27λ5.8GHz
[21]	Dual-slot feed DRA	5.5	2 (dual-sided)	8 × 8	16	16.4	14.7 and 15.5	2.1 × 2.1 × 0.65λ
[23]	CPMSA	6	2	NA	11.6	14.68	17.4	2.83 × 3.23 × 0.49λ
[27]	Stacked-patch array	13.3	2	9 × 9	28	31	18	3.5 × 3.5 × 0.53λ
[28]	Strip-fed slot	5	2	4 × 4	44	45	11.6	1.1 × 1.1 × 0.095λ
[35]	Slot-fed patch array	5.6	1	9 × 9	7	14.8	7.92	3.453 × 3.453 × 0.5264λ
Proposed	Patch	5.8	3	5 × 5	6.29	6.7	13.4	1.65λ × 1.65λ × 1.48λ

Given antenna dimensions are converted in terms of wavelength for convenience.