A four-element compact wide-band optically transparent MIMO antenna with a full ground plane is proposed. The four elements system has size of 24 × 20 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> the undivided as most real-time systems demand common reference. complete achieves around 85% transparency due to combination AgHT-8 and Plexiglas which forms conductive patch/ground substrate, respectively. geometry leads dual-band...

The paper presents a multiband frequency reconfigurable microstrip patch antenna structure loaded by copper-based and water liquid-based superstrate resonators. tunability is achieved three PIN diodes with the highest of 320 MHz. enhancement gain attained concept superstrates in which periodic implemented split-ring resonators considered for performance analysis. By loading (SRR), presented design achieves maximum broadside directivities 7.70 dB 5.31 dB, provides tunable bandwidths 250 MHz...

This paper presents a low-profile circularly polarized (CP) antenna with wideband and polarization-reconfigurable characteristics. The proposed consists of truncated-corner patch working as CP source non-uniform metasurface (MS) acting parasitic elements for performance enhancement. MS is utilized to produce additional operating bands in the higher frequency range, which are then combined lower band produced by driven significantly broaden overall bandwidth. polarization switching mechanism...

This letter presents a frequency-reconfigurable antenna for cognitive radio application in sub-6 GHz 5G band. The proposed consists of wideband (WB) monopole integrated with narrowband microstrip patch single-layer substrate. Two PIN diodes are employed to switch between the WB sensing mode and (NB) communication mode. Three varactor implemented on continuously tune operating frequencies NB produces wide bandwidth 54.2% (3.19–5.56 GHz) tunable 44% (3.4–5.32 Both modes present good radiation...

This letter presents a simple single-layered dual-band circularly polarized microstrip patch leaky-wave antenna (LWA). The proposed design consists of two linear circular arrays that are coupled to 50 Ω line. While having high gain, the rotating sense in each band is opposite other, which makes concept well-suited for uplink and downlink satellite communication. For demonstration, an has been designed operate at 5.0 8.0 GHz. It noted can be easily adapted other frequencies. With total length...

Chipless RFID sensor is currently one of the most promising designs, especially in food safety sector, because it has a robust structure and inexpensive for mass production. This paper proposes simple, compact, low-cost chipless tag frozen monitoring. The system consists an interrogator antenna, which antipodal Vivaldi inside flat container that contains small quantity ice. When receiving power from alters frequency reflected signal if ice melts. One three states material can be detected,...

This article presents a method to design broadband circularly polarized (CP) Fabry-Perot Resonator (FPR) antenna. The proposed antenna is based on multi-layer thin dielectric slabs arranged in close proximity as partially reflecting surface (PRS) and an Archimedean spiral CP radiating source. Experimental results show operation from 6 13 GHz, which the reflection coefficient less than −10 dB axial ratio (AR) lower 3 dB. In addition, good radiation patterns high broadside gain of better 10.8...

In this paper, a low-profile and broadband array antenna is proposed for satellite downlink applications. The comprised of 4 × elements, which are yielded the C band from 3.7 to 4.8 GHz. By arranging frequency selective surface (FSS) unit cells according new architecture, high directivity provided, in each element covered by lattice 3 periodic metal plates. Based on RO4350B, final design with total size 180 3.175 mm3 (2.38λ 2.38λ 0.04λ at lowest 3.97 GHz) has been fabricated, measured,...

This paper proposes a chipless RFID sensor to detect permittivity changes in the Material Under Test (MUT) that is placed small container. The proposed design comprises an interrogator antenna and miniaturized aluminium tag shaped as meander line reduce size ensure high Q-factor. detection of material through observation frequency peaks reflected signal <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> , which corresponds resonating...

A novel wide slot transparent circularly polarized antenna is illustrated in this paper. Circular polarization achieved by using a slotted S-shaped loop with diagonally trimmed edges, two separate mirrored U-shaped slots feed location at the center of conductive patch. Conductive oxide AgHT-8 used as feeding patch over 1.48 mm thick plexiglass substrate (εr = 2.3, tan δ 0.000379). The operates band spanning from 0.80 GHz - 1.05 (~27.47%) axial ratio (AR) less than 3 dB within same band....

A novel compact antenna with characteristics of broadband and high gain is proposed in this paper. The comprises 1 × 2 elements that are connected together by a balance power divider. To create new shape, the combination dipole patch shapes acts as monopole. As result, impedance bandwidth enhanced. Additionally, improved using an artificial magnetic conductor (AMC) surface. prototype, overall size 0.66 λ0 x 0.79 0.11 (λ0 wavelength free space at lowest operating frequency 2.63 GHz) has −10...

A very wideband circularly polarized (CP) crossed dipole antenna is presented in this paper. The primary radiating element of the consists two straight dipoles arranged orthogonally through double printed rings. To further enhance axial ratio bandwidth, a cavity with proper size and single parasitic are employed to generate additional bands. use reflector investigated thoroughly, providing solid framework for designing type antennas. final design an overall 0.92λo × 0.32λo at center CP...

This paper proposes a reconfigurable microstrip patch antenna design for wireless ISM band applications. The simultaneously uses PIN Diodes to switch between linear and circular polarization at 2.45 GHz Varactor Diode continuously tune the operating frequency from 1.73 GHz. performance is characterized as combination of ON/OFF state bias voltage varying 0.8V 10V. A good agreement simulation measurement obtained which validates proposed method. frequency/polarization promising various...

In this paper, a frequency reconfigurable liquid metamaterial microstrip-based radiating structure is proposed and it an attempt toward achieving reconfiguration in metamaterial-based microstrip structures. Reconfigurable antenna design superstrated with five layers based on distilled water split-ring resonator. Superstrate give enhancement from 6.5 dB to 13.1 gain of the antenna. A patch reconfigured through PIN diodes as RF switches. Switching ‘on’ ‘off’ states are used for radiation...

CPW fed transparent dual-ring antenna backed with an Artificial Magnetic Conductor (AMC) is presented. The dual ring resonates in the frequency band of ISM application having impedance bandwidth and average gain 5.46 - 5.96 GHz (8.8 %) 1.1 dBi, respectively. AMC embedded on lower side to enhance where analysis terms varying array elements carried out. overall transparency structure achieved by using AgHT-8 Plexiglas which simulated CST software check performance reflection coefficient,...

In this paper, a 2-by-1 MIMO reconfigurable antenna using Quarter Mode Substrate Integrated Waveguide (QMSIW) is introduced for wireless communication application. By combining three techniques, the proposed design has compact size due to QMSIW cavity, operation frequency flexibility by varactor diodes, and channel capacity improvement from setup. The integrated with (MA46H120) tune its operating 2.35 2.55 GHz (ISM band). high isolation level (below -15 dB), peak gain of around 2.3 dBi...

This paper proposes a frequency/polarization reconfigurable antenna (RA) incorporating Frequency Selective Surface (FSS) to achieve dual-band and similar high-gain characteristics. The proposed RA-FSS design using 4 PIN Diodes can produce reconfigurability between circular polarization (CP) at 1.8 GHz linear (LP) 2.45 GHz. fabricated prototype shows good CP performance while the measured peak broadside gains are about 7.2 dBi 8.5 when diode ON OFF, respectively.

In this paper, a fully transparent antenna comprising of an Artificial Magnetic Conductor (AMC) backed Co-planar Waveguide (CPW) fed dual-ring monopole is presented. The and AMC structure achieve transparency due to the use AgHT-8 conductive oxide Plexiglas substrate. Measured performance shows impedance bandwidth 5.3 – 6 GHz (12.4%) in U-NII-1 U-NII-4 frequency band with peak gain 5.7 dBi which approximately increase 4.5% 3.9 dBi, respectively, as compared standalone antenna. simulation...