Abstract:Producing a suitable impedance matching between the radiating element and the feedline is the prior hurdle to overcome for a wideband antenna with circular polarisation designs. This study presents a novel antenna consisting of a defected ground structure (DGS) and a crescent-slot radiating patch for broad impedance bandwidth. In addition, a narrow rectangular slot was etched on the ground plane for antenna compactness and outcomes improvement. In order to examine the reliability, two different numerical softw… Show more
“…The slightly smaller size antenna providing an omnidirectional pattern with higher gain covered widen bandwidth was presented in [18], but the complexity of the antenna was high as adopted fractal design technique. In [19], an omnidirectional antenna with slightly larger size provided a narrower bandwidth and lower gain than this proposed antenna. A larger size, multilayer, stable unidirectional pattern with higher gain but more complex structure and a narrower bandwidth for sub-6 GHz was proposed in [20].…”
In this research, a wideband bi-directional pattern antenna implemented by a circular monopole encircled with an enforced-radiation circular ring incorporated with inversed L-shaped stub is designed to operate over the mid-band of 5G applications ranging from 2 to 6 GHz. It is contrived of a copper overlaid on FR4 substrate with relative permittivity of 4.3 and height of 1.6 mm. This proposed antenna is fed by a 50-ohm coplanar waveguide, which is printed on the same side of the radiated circular monopole. To further enrich the impedance matching, a pair of etched slots is added-on the ground plane near the fed line to reduce the return loss. In the study, the initial parameters are theoretically worked out, and then simulation is then performed by using an electromagnetic solutions tool to numerically discover the set of solution parameters. From the simulation results, this proposed antenna offers the |S11|<–10 dB covered the operating frequency running from 1.79 to over 8 GHz with fractional bandwidth 126.90 % and 1.74 to 7.07 GHz with fractional bandwidth 101.04 % for the simulation excluded and included SMA, respectively. It provides a linear polarization with total efficiency better than 81.5 %. After that, an antenna prototype with compact dimensions of 45×45×0.6 mm3 was fabricated and testified to validate the simulation results. The measurement results provide a stability bi-directional pattern with peak gain of 5.54 dBi covering a 10 dB return loss bandwidth of 118.5 % (1.93–7.54 GHz). Simulated |S11|, 2D radiation pattern and gain are reasonably in good agreement with experimental results. Furthermore, this proposed antenna is compared with the current compact, wideband and 5G antenna to indicate its prospective for the interested bands
“…The slightly smaller size antenna providing an omnidirectional pattern with higher gain covered widen bandwidth was presented in [18], but the complexity of the antenna was high as adopted fractal design technique. In [19], an omnidirectional antenna with slightly larger size provided a narrower bandwidth and lower gain than this proposed antenna. A larger size, multilayer, stable unidirectional pattern with higher gain but more complex structure and a narrower bandwidth for sub-6 GHz was proposed in [20].…”
In this research, a wideband bi-directional pattern antenna implemented by a circular monopole encircled with an enforced-radiation circular ring incorporated with inversed L-shaped stub is designed to operate over the mid-band of 5G applications ranging from 2 to 6 GHz. It is contrived of a copper overlaid on FR4 substrate with relative permittivity of 4.3 and height of 1.6 mm. This proposed antenna is fed by a 50-ohm coplanar waveguide, which is printed on the same side of the radiated circular monopole. To further enrich the impedance matching, a pair of etched slots is added-on the ground plane near the fed line to reduce the return loss. In the study, the initial parameters are theoretically worked out, and then simulation is then performed by using an electromagnetic solutions tool to numerically discover the set of solution parameters. From the simulation results, this proposed antenna offers the |S11|<–10 dB covered the operating frequency running from 1.79 to over 8 GHz with fractional bandwidth 126.90 % and 1.74 to 7.07 GHz with fractional bandwidth 101.04 % for the simulation excluded and included SMA, respectively. It provides a linear polarization with total efficiency better than 81.5 %. After that, an antenna prototype with compact dimensions of 45×45×0.6 mm3 was fabricated and testified to validate the simulation results. The measurement results provide a stability bi-directional pattern with peak gain of 5.54 dBi covering a 10 dB return loss bandwidth of 118.5 % (1.93–7.54 GHz). Simulated |S11|, 2D radiation pattern and gain are reasonably in good agreement with experimental results. Furthermore, this proposed antenna is compared with the current compact, wideband and 5G antenna to indicate its prospective for the interested bands
“…The CS equivalent circuit is presented in Asmeida et al (2021) 30 composed of two serial inductors and one parallel capacitor. However, the equations to calculate these lumped elements are not presented.…”
“…where n is the coupling between the DR and the slot, Z 0 is the characteristic impedance of the line, S 11 is the reflection coefficient, and Q 0 is the quality factor. The CS equivalent circuit is presented in Asmeida et al (2021) 30 composed of two serial inductors and one parallel capacitor. However, the equations to calculate these lumped elements are not presented.…”
In this communication, the author presents an eight-element sequentially rotated (SR) circularly polarized (CP) dielectric resonator antenna (DRA) for operation in the IEEE 802.11a standard. A novel resonating element composed of a crescent slot (CS) used to excite a rectangular dielectric resonator (RDR) is proposed that has two orthogonal modes TE y 1δ1 and TE x δ21 as required for CP radiation. An SR series-parallel geometry is used to prototype the array feed network to allocate the array elements to symmetrical positions. The phase progression of each element was 45 along the array, and the signal magnitude was distributed evenly based on the binomial theory to enhance the antenna performance. The prototyped SR array had a size of 46 Â 46 Â 0:813 mm 3 and was measured and characterized in order to authenticate the design. The resonance bandwidth (S 11 < À10 dB) was found to be 14.28% with a 3 dB axial ratio (AR) of 17.7% for right-hand CP. The gain varied from 15.71 to 16.26 dBi within the operating band. The size, gain, and impedance bandwidth of the proposed array make it a potential candidate for devices operating in the IEEE 802.11a band.
“…It can be seen that the input reflection coefficient and impedance bandwidth results obtained by both softwares are in reasonable agreement. At both resonant frequencies, there is a slight difference in the level of the input reflection coefficient and impedance bandwidth as the two softwares used two different methods for the substrate losses at high frequencies, and meshing techniques [33] , [34] . Figure 9 Comparison of the input reflection coefficient of the optimized antenna using HFSS and CST.…”
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