Point-of-care (POC) diagnostic medical devices require simple but sensitive and inclusive detection capabilities. This study develops a unique photonic crystal fiber-based surface plasmon resonance (PCF-SPR) sensor that uses a u-grooved selective coating for extremely sensitive remote and biosensing applications. Scale-down (SCD) air holes control the path that incoming light takes through the sensor in order to activate the free electrons that are present there. To reduce outward radiation, perfectly matched layers (PML) of the absorbing boundary are integrated in addition to optimizing the structural geometry and material thickness. The Finite Element Method (FEM) is employed to quantitatively tune the properties of light directing and sensitivity of the proposed sensor. The proposed sensor has the maximum amplitude sensitivity (AS) of 1189 RIU ^-1 , the highest wavelength sensitivity (WS) of 12,500 nm/(RIU), and an outstanding resolution of 8.0×10 ^-6 RIU. The constructed model covers a large refractive index (RI) range of unknown samples, ranging from 1.29 to 1.40. This range allows this sensor to cover the detection of a wide range of bio-analytics, including viruses, cancer cells, carbohydrates, proteins, and DNA/RNA etc. We strongly believe that the suggested sensor will play an extremely useful role in the detection of POC bio-sample detection.

A new wideband and enhanced gain Fabry-Perot cavity antenna is presented in this paper. The Fabry-Perot cavity is established between a single-layer metamaterial-based partially reflective surface (PRS) and a simple feeding slot antenna. The unit cell of the PRS consists of printed and etched square rings on both sides of the superstrate. A 6x6 array of the unit cells are optimized to produce a positive reflection phase gradient required for the gain enhancement. Simulated results of the designed Ku-band antenna demonstrate an impedance bandwidth of 13.1-15.3 GHz (15.5 %) with a gain enhancement up to 8.2 dB (i.e., 150% gain increase above the feeding antenna) and a 3-dB radiation bandwidth of 18.7%. Experimentally observed reflection and radiation responses of the fabricated prototype validate the simulated results.

A planar ferrite phase shifter is designed to exhibit simultaneous analog and digital phase tuning properties. Analog phase control is achieved by using an external magnetizing field, and digital phase change is realized by switching the phase shifter operation from microstrip to waveguide mode. Simulated and experimental results are presented to demonstrate the impedance matching and dual-phase tuning properties. At 9-GHz, a differential digital phase shift of 100°/bit and an analog phase control of 16°/mT is exhibited. When applied in phased array antennas, these easily integrated low-cost planar phase shifters can produce high-resolution wide-angle beam scan by employing analog/digital phase control circuits.

This work presents a novel, low-cost frequency and pattern reconfigurable antenna for Internet of Vehicles (IoV) applications. The proposed design addresses the issue of using multiple antennas for different frequency bands to enable vehicles to communicate over several channels. Also, it relieves the need for a sophisticated beamforming network. The proposed radiating system comprises a simple segmented patch antenna (SPA) integrated with a few electronic switches to achieve frequency and pattern reconfiguration. The SPA consists of a radiating patch with two incorporated slots and two slits. Three p-i-n diodes are integrated into both slots to vary the shape of the patch to enable frequency reconfiguration at 4.1, 4.7, 5.0, and 5.7 GHz. Adopting the Yagi-Uda principle, two parasitic elements, functioning as either a reflector or a director, are positioned on both sides of the patch, facilitating the pattern reconfiguration. This novel SPA can scan its beam in twelve directions (0, ±38∘, ±50∘, ±63∘, ±90∘, ±143∘, 180∘) with a measured peak gain and efficiency of 4.2 dB and 92%, respectively. The proposed antenna is experimentally tested to validate the concept. Employing only five p-i-n diodes, this inexpensive antenna can radiate twelve distinguishable switchable beams, including broadside and end-fire radiation over four frequencies with acceptable gain, matching bandwidth, and efficiency. This makes the proposed antenna an excellent candidate for IoV applications.

Reconfigurable planar antennas are essential in mul-tifunctional wireless communication devices. This paper presents the design of a frequency reconfigurable patch antenna printed on a composite substrate made of a dielectric and a magnetic meta-material (MMM). The MMM comprises magnetized ferrite slabs with embedded split-ring resonators (SRR). The constructive coupling between the resonances of the magnetized ferrites and SRR is optimized to achieve promising reconfigurable properties. The proposed frequency reconfigurable antenna demonstrates a 158% increase in the frequency tuning range. Furthermore, the simulated results are experimentally verified, and the composite substrate shows slight effects on the antenna radiation charac-teristics.