Dual wideband circular polarized CPW-fed strip and slots loaded compact square slot antenna for wireless and satellite applications

Square Slot Antenna for Wide Circularly Polarized Bandwidth and Axial Ratio Beamwidth

“…In Step 3, to further improve the ARBW of 'Antenna-2', following [23], three slots are introduced on the exterior periphery of the grounded square to alter the current path for the desired result. Two horizontal slots of dimensions (x1 × y1) and (x2 × y2) are etched in the lower and upper left corners, respectively, along with one vertical slot of dimension (x3 × y3) in the lower right corner.…”

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

“…It merged the dual 3‐dB ARBW Ku‐bands into single 3‐dB ARBW Ku‐Band of 14.08 to 18.71 GHz. The location and dimensions of the spiral slot are optimized such that it does not affect the IBW but enhances the 3‐dB ARBW . Fourth stage structure, that is, Ant.4 is derived by loading two small semicircular slots on lower CPW ground plane.…”

“…The location and dimensions of the spiral slot are optimized such that it does not affect the IBW but enhances the 3-dB ARBW. 25,26 Fourth stage structure, that is, Ant.4 is derived by loading two small semicircular slots on lower CPW ground plane. This resulted into merging of two bands, that is, 10.30 to 17.65 GHz and 19.1 to 29.18 GHz into a single band of 10.40 to 29.07 GHz.…”

“…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).…”

Broadband circularly polarized printed falcate‐shaped monopole antenna

“…In the literature, many multiband CP planar antennas have been reported, 1‐6 but their 3‐dB axial ratio (AR) bandwidths are generally narrower than several hundred MHz. In order to realize wideband or even broadband CP, two types of antennas are generally used, that are, planar wide‐slot antennas 7‐13 and planar monopole antennas 14‐20 . In Reference 7, a coplanar waveguide‐fed broadband CP square slot antenna was proposed, the 3‐dB AR bandwidth is about 60%.…”