Dual‐band CP coplanar waveguide‐fed split‐ring resonator‐loaded G‐shaped slot antenna with wide‐frequency ratio

Abstract

This study presents a dual‐band circularly polarised (CP) coplanar waveguide fed split‐ring resonator‐loaded rectangular slot antenna. A wide‐frequency ratio (the ratio of the centre frequencies of the two bands) ranging from 1.2 to 2 can be achieved by changing the dimensions of the resonator. To demonstrate the concept, an antenna having two bands, one at 2.4 GHz and the other at 3.5 GHz, is designed and measured input reflection coefficient, axial ratio, and radiation pattern are compared with the simulation results and they are found to be in good agreement. Measured results show that the proposed antenna operates in two frequency bands with overlapping bandwidths of 32.13% (2.22–3.07 GHz) and 2.17% (3.415–3.49 GHz). The axial ratio and impedance bandwidths are used to compare the performance of the proposed antenna with some of the published dual‐band CP antennas.

Epsilon‐shaped circularly polarized strip and slot‐loaded ultra‐wideband antenna for Ku‐band and K‐band

“…The antennas reported in References provide broadband circularly polarization and have relatively larger size. Also the antenna structures reported in References provide wideband CP with small IMBW and 3‐dB ARBW. The conventional antennas reported in literature have limitation of large dimensions and they provide multiband/broadband CP performance at low frequencies (S, C, and X bands).…”

“…10 Further, the researchers have reported various approaches to achieve single-band/wideband/broadband/ dual-band CP antenna using different approaches, that is, dual or synchronous feed, fractal structure, multilayer reflector antennas, ground plane, or radiating patch loaded with different stubs/slits/strips. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] In these structures, multiband/broadband/wideband circular polarization was achieved by using different techniques like two asymmetric T-shaped fed line, 11 an Inverted-L strips, 12 grounded L-strip and a lightening-shaped patch with asymmetric feed, 13 three grounded L-shape strips, 14 dual fed circularly polarized square slot antenna (CPSSA) with L-shape patch, 15 two crossed dipole antenna includes meander line loaded spidron fractal patch, 16 slanting edge defected ground structure (DGS) and dual orthogonal arms, 17 two deformed parallel monopoles, 18 pair of SRR on the backside and corner truncated square slot, 19 G-shaped slot antenna with SRR loaded, 20 an I-shaped grounded stub with two parasitic elements, 21 a monopole patch with two orthogonal feeding ports, 22 a spidron fractal patch with microstrip-fed, 23 a hex decagon circular patch with defective ground structure, 24 strip and slotloaded coplanar waveguide (CPW)-fed square slot antenna with two spiral slots, 25 CPW-fed dual sense CP antenna with grounded spiral slots, 26 a compact 3D CP antenna with wide axial ratio beamwidth. 27 All the previously discussed antenna geometries have either large dimensions and narrow impedance bandwidth (IBW) or narrow axial ratio bandwidth (ARBW).…”

Flexible dual‐band dual‐polarised CPW‐fed monopole antenna with discrete‐frequency reconfigurability

“…The slot coupling is represented by capacitance C1. Foster first canonical form is used to model the proposed antenna [26]. The Band 1 (lower frequency band) response is obtained using two parallel RLC circuits connected in series.…”

Dual‐band metasurface‐based CP low‐profile patch antenna with parasitic elements

“…The third type considers patch radiator loading with metamaterials. For example, the complementary split ring resonator has been widely used in patch antennas for dual-band applications [16][17][18][19][20]. Epsilon negative transmission lines [21,22], CRLH TLs [23][24][25][26][27][28][29], and left-handed (LH) structures [30] were loaded in conventional antennas for dual-band/multi-band operation.…”