Reconfigurability in an antenna system is a desired characteristic that has been the focus of much research recent years. In this work, ohmic contact cantilever RF-MEMS switches are integrated with self-similar planar antennas to provide reconfigurable radiates similar patterns over wide range frequencies. The different issues encountered during integration MEMS and overall design procedure described herein. final model at three widely separated frequencies very radiation patterns. proposed...

The purpose of this letter is to introduce a compact ultrawideband (UWB) diversity antenna with very low envelope correlation coefficient (ECC). design employs hybrid isolation enhancing and miniaturization technique. consists two counter facing monopoles, miniaturized by using not only inverted-L stubs but also complementary split-ring resonator (CSRR) on the ground plane. added components enhance enable tighter packing antennas. result multiple-input-multiple-output (MIMO) array an overall...

Koch-shaped dipoles are introduced for the first time in a wideband antenna design and evolve traditional Euclidean log-periodic dipole array into Koch-dipole (LPKDA). Antenna size can be reduced while maintaining its overall performance characteristics. Observations characteristics of both antennas discussed. Advantages disadvantages proposed LPKDA validated through fabricated proof-of-concept prototype that exhibited approximately 12% reduction with minimal degradation impedance pattern...

A MEMS reconfigurable ultra-wideband (UWB) antenna that rejects on-demand all WLAN signals in the entire 5.15 to 5.825 GHz range (675 MHz bandwidth) is presented. The design, miniaturization procedure, and monolithic integration with biasing network on SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Quartz substrate are described. challenges addressed work presented a way useful for engineers. method vary rejection bandwidth also...

Devices and systems that use RF microelectromechanical (RF MEMS) switching elements typically one switch topology.The is designed to meet all of the performance criteria.However, this can be limiting for highly dynamic applications require a great deal reconfigurability.In paper, three sets MEMS switches with different actuation voltages are used sequentially activate deactivate parts multiband Sierpinski fractal antenna.The implementation such concept allows direct electrostatic through...

This paper presents the design, fabrication and measurements of a direct-write printed low-cost flexible inverted-F antenna on an ultra-low-cost paper-based organic substrate for wireless local area network (WLAN) display applications. Innovations include study utilization as high-frequency first time in gigahertz (GHz) range, technology printing RF electronic device, investigation flexibility conjunction with displays. Although substrates exhibit relatively high dielectric losses (tanδ ~...

We propose a novel approach to enhance the bandwidth of high directivity resonant cavity antenna (RCA) by applying two dielectric layers as superstrates. The is based on creating cavities corresponding operating frequency bands that combine form single wide band operation. RCA design discussed in methodological manner determine thicknesses superstrates, separation distance between them, and ground plane. show proposed technique capable enhancing from 9% superstrate 17.9% RCA, with only...

A phased-array test platform for studying the self-adapting capabilities of conformal antennas is developed and presented. Specifically, a four-port 2.45-GHz receiver with voltage controlled phase shifters attenuators designed along four individual printed microstrip patch attached to surface. Each antenna connected corresponding port flexible SMA cable. It shown that appropriate compensation, distorted radiation pattern array can be recovered as surface changes shape. This recovery...

An ultra‐compact dual‐polarised ultra‐wideband multi‐input multi‐output antenna made with a single‐shared‐radiating element and two meandered feeding lines are proposed. Miniaturisation is achieved by using combination of techniques, including resonant stub connected to the ground through which shorts excessive coupled energy before it reaches other port minimises coupling, slots etched in radiator that also help minimise mutual while allow bring closer greatly reduce overall size antenna....

A wide-angle scanning planar phased array with magnetic current elements is proposed. pattern reconfigurable technique used to design the element that enhances gain and decreases sidelobe level throughout entire range. The comprised of eight in a 2×4 arrangement uniform spacing. proposed operates at 5.8 GHz can scan 3 dB beamwidth upper ground elevation plane from -90° +90° enabled by two-step reconfigurability mechanism consisting of: 1) coarse-angle 2) line-angle scanning. Significant...

An eight element, compact Ultra Wideband-Multiple Input Multiple Output (UWB-MIMO) antenna capable of providing high data rates for future Fifth Generation (5G) terminal equipments along with the provision necessary bandwidth Third (3G) and Fourth (4G) communications that accomplishes band rejection from 4.85 to 6.35 GHz by deploying a Inductor Capacitor (LC) stub on ground plane is presented. The incorporated also provides flexibility reject any selected as well control. orthogonal...

A compact flexible multi-frequency antenna for smart portable and devices is presented. The consists of a coplanar waveguide-fed slotted circular patch connected to rectangular secondary resonator (stub). thin low-loss substrate used flexibility, stub in the feedline deployed attain wide operational bandwidth. slot etched middle patch, p-i-n diode placed at its center. frequency reconfigurability achieved through switching that distributes current by changing antenna's electrical length. For...

The design of a reconfigurable single folded slot antenna is shown. Metal strips are used in the to manipulate ground size around slot, which yields changing slot's perimeter and thus resonant frequency antenna. first illustrated. Later, modified be reconfigurable. frequencies for chosen applicable with WLAN applications. design, simulation, measurements described. simulated results both return loss maximum gain agree measurements. has similar radiation patterns bands. advantage this that...

An ultrawideband (UWB) antenna that rejects extremely sharply the two narrow and closely-spaced U.S. WLAN 802.11a bands is presented. The designed on a single surface (it uniplanar) uses only linear sections for easy scaling fine-tuning. Distributed-element lumped-element equivalent circuit models of this dual band-reject UWB are presented used to support explanation physical principles operation band-rejection mechanism thoroughly. circuits evaluated by comparing with response has very high...

Self-adapting conformal antennas for changing spherical surfaces are investigated in this work. More specifically, the theory on relationship between radius of surface, element spacing array and required phase compensation is developed. Initially, theoretical validation, a 4 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex Notation="TeX">$\times$</tex></formula> phased antenna assembled with individual microstrip...

We propose a novel method to extend the scanning range of planar phased arrays based on phase gradient metasurface. The metasurface is developed by generalized Snell's law, which can irregularly tailor direction propagation traversing electromagnetic waves. proposed transmission (TGPMS) uses bidirectional expansion in array application. TGPMS consists periodic and multilayer subwavelength elements that contribute wide shift multiple incident angular stability. design verified experimentally...

In recent years, the art of using neural networks (NNs) for wireless-communication engineering has been gaining momentum. Although it used a variety purposes and in different ways, basic purpose applying is to change from lengthy analysis design cycles required develop high-performance systems very short product-development times. This article overviews current state research this area. Different applications neural-network techniques wireless communication front ends are briefly reviewed,...

In this letter, p-i-n diodes are used as switches to connect and disconnect four patch sections a midsection of planar antenna. The antenna system is connected the field programmable gate array (FPGA) board controlling activation these switches. with incorporated designed, installed, measured. methodology for using an FPGA optimally control produce desired frequency operation presented analyzed. analogy between measured simulated results found be satisfactory. proposed can various designs...

A new method to reconfigure, tune or program an antenna is presented and validated through a fabricated proof-of-concept prototype. The relies on the changing electrical properties of smart material, vanadium dioxide ( VO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ), across its solid-to-solid phase transition. change in material induced thermally. developed device monolithically integrated -based that changes resonant frequency...

We present a comprehensive study of new method to reconfigure, tune, and/or program antennas and radio-frequency (RF) devices. The consists using electrical signals induce the solid-tosolid phase transition in vanadium dioxide (VO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) thin-film patterned structures that connect device metallization layer with extensions, thus effectively changing geometry device. Applied voltage pulses...

This paper presents a highly compact frequency-selective surface (FSS) that has the potential to switch between X-band (8 GHz–12 GHz) and C-band (4 GHz–8 for RF shielding applications. The proposed FSS is composed of square conducting loop with inward-extended arms loaded curved extensions. symmetric geometry allows shield perform equally transverse electric (TE), magnetic (TM), 45° polarizations. unit cell dimension 0.176 λ0 excellent angular stability up 60°. resonance mechanism was...