Proposal and comprehension of spur line embedded frequency notched Ultrawideband antenna is projected in this paper. The performance of the antenna is enhanced by using square shaped metamaterial. Quarter-wavelength long spur line (lines) on the feeding microstrip line of UWB antenna backs a notch-filtering action to provide single/double/triple notch (notches) within the UWB spectrum of the antenna. The planned method is very simple and radiator independent. The conventional monopole antenna is loaded with square shaped metasurface (MS) to enhance the performance of the antenna. With and without metamaterial loaded single, double and triple spur-line embedded microstrip fed circular monopole antennas are separately designed, fabricated and measured. All the deliberate models are fabricated and considered for measurement of impedance and radiation characteristics .Measured results show very good consistency with that of results obtained from full wave simulation.

In the proposed paper a Substrate Integrated Waveguide in Half Mode (HMSIW) is designed for making a novel leaky wave antenna which was further analysed. The novel leaky wave antenna is designed with periodic variation in the longitudinal slots in the upper part of the substrate in a selective frequency along with band pass filter in the particular range with pass band at Centre frequency of 16.8GHz, 24.7GHz and 28.6GHz. The Filter is designed with the use of Defective Ground plane (DGS) by cutting slots of SRR in the lower ground plane. The leaky wave antenna which has been suggested in paper resonates at 17GHz and 24.6GHz, which is very close to the operating mid frequency of the band pass filter which is 16.8GHz, 24.7GHz and 28.6GHz. By designing of leaky wave antenna in the proposed manner, various advantages can be obtained such as reduction in size, frequency selectivity, removal of unwanted noise with the help of band pass filter. The novelty which can be achieved in this proposed antenna is that it leads to gain enhancement up to 6dB and 8dB at selective frequency of 17GHz and 24.6GHz with the reduced size HMSIW in which further size reduction is achieved with the assistance of DGS in ground plane.

This manuscript presents a low-profile bowtie antenna loaded by a rectangular array of artificial magnetic conductor metasurface (AMC) for ground penetrating radar (GPR) applications. The proposed antenna operates from 200 MHz to 400 MHz, with stable radiation characteristics. Unconventionally in low-frequency GPR antennas, the AMC structure is placed directly at the backside of the substrate without any separation to maintain the antenna robustness. The analytical formula for reflection coefficient is introduced and compared to the full wave simulation to investigate AMC partial reflectivity at low frequencies. The prospective antenna has a size of 59.44 ×37.2 cm² covering vast fractional bandwidth (FBW) of 79.4%. Furthermore, a back reflector is placed at 33.3 cm from the antenna to eliminate the back radiation, avoid unwanted clutters during the GPR measurements and increase the antenna gain. As a proof of concept, the proposed antenna is fabricated and measured illustrating good agreement between simulated and measured results. A GPR time domain analysis is presented to validate the antenna performance.

This article proposes broadband “HEART” shaped hybrid patch antenna with reduced sized slot loaded ground plane. Conventional circular patch is effectively augmented to “HEART” shape by adding two circular shaped radiating elements at suitable position of the patch. Two slots of rectangular shaped are optimally placed in the reduced ground plane for proper impedance matching over a frequency range. Combined effect of this technique introduces high gain, low profile and broadband antenna design. The physical and electrical dimensions of the proposed antenna are 29 mm × 32 mm × 1.6 mm and 0.266? × 0.241? ×0.0108? respectively, where ? indicates the wavelength of minimum frequency of operation. The suggested antenna exhibits impedance bandwidth of 5 GHz (from 2.5 GHz to 7.5 GHz) and resonating at 2.8 GHz, 3.4 GHz, 5.5 GHz and 6.9 GHz frequencies respectively. 100% fractional bandwidth and peak gain of 3.6dBi at 5.5 GHz and 6.9 GHz with enough stable patterns of E field and H field are obtained. The presented antenna design and simulation are done by CST software and the equivalent RLC circuit is modeled by using ADS software. The proposed antenna is developed on low cost FR-4 substrate (dielectric constant is 4.4, loss tangent is 0.02, and height is 1.6 mm) and then it is tested using standard microwave measurement setup. The suggested antenna may be attractive for use in various frequency bands like WiMAX (3.4–3.6 GHz and 5.5 GHz),from 3.3GHz to 4.2GHz n77 frequency band, from 3.3GHz to 3.8 GHz n78 frequency band, from 4.4GHz to 5 GHz n79 frequency band and from 5.08 GHz to 5.73 GHz Wireless local area network frequency band. It also covers 5G-V2X band (3.3-5GHz), LTE 46 band (5.15-5.925GHz), short-range remote sensing, object positioning, high-bandwidth communications, VSAT etc.

In order to reduce the overreliance of electronic devices on energy storage medium, a multiband annular slotted microstrip patch antenna with a voltage multiplier rectifier circuit has been proposed in this research work. The proposed antenna resonant at 4.8 GHz, 5.1 GHz, 6.6 GHz, and 8.2 GHz, with reflection coefficients of -24.84 dB, -28.68 dB, -26.96 dB, and -16.36 dB, respectively. Furthermore, the proposed antenna achieved a -10 dB bandwidth of 850 MHz between 4.70 GHz and 5.56 GHz, 325 MHz between 6.43 GHz and 6.75 GHz, and 469 MHz between 8.05 GHz and 8.57 GHz, with gains of 3.42 dB, 2.78 dB, 5.91 dB, and 4.68 dB, respectively. The prototype is fabricated and the measured frequencies are 4.5 GHz, 5 GHz, 6.6 GHz, and 8 GHz, respectively. The proposed research finds potential in sensor networks, wireless devices, and other areas.