In this letter, we propose a tunable patch antenna made of slotted rectangular loaded by number posts close to the edge. The are short circuited ground plane via set PIN diode switches. Simulations and measurements verify possibility tuning in subbands from 620 1150 MHz. Good matching has been achieved over most bands. Other performed designs show that more than one octave can be using proposed structure.

This paper proposes a new mobile handset antenna structure to reduce the value of specific absorption rate (SAR).The is based on PIFA and operates at dual-bands 0.9 GHz 1.8 GHz.The chassis current reduced using metallic shim-layer inserted between patch chassis.This connected through posts whose number positions are determined optimization techniques.Sidewalls attached increase gain radiation towards human head.Simulations in cheek mode show that SAR reduction factor (SRF) proposed averaged...

A class of novel millimetric uniplanar series resonators are presented, which can be used in monolithic and hybrid microwave integrated circuits (MIC's). The proposed structures able to demonstrate low radiation compactness characteristics, attractive for passive active circuits. principle achieving these high-quality is described also confirmed by experimental theoretical results, good agreement up 50 GHz. To illustrate the features their effectiveness, two classes miniature coplanar...

A novel compact dual-band reconfigurable square-ring microstrip antenna is presented. The tuning achieved using a single varactor diode connected to small square patch attached an inner corner of the square-ring. perturbs symmetry and splits two degenerate modes create operation. frequency ratio in range 1.04 1.4 can be by proper selection size. lower resonance further decreased loading at its reverse biased diode. has almost no effect on upper frequency. This technique used implement...

A compact four-element dual-band multiple-input and multiple-output (MIMO) antenna system is proposed to achieve high isolation low channel capacity loss. The MIMO was designed optimized cover the dual-frequency bands; first frequency band a wide band, it covers range of 1550–2650 MHz, while other 3350–3650 MHz range. measured wide-band impedance bandwidths 1.1 GHz 300 were achieved in lower upper bands, respectively. structure consists four novel elements, along with plus-sign-shaped ground...

A communication system is proposed for the Internet of Things (IoT) applications in desert areas with extended coverage regional area network requirements. The implements a developed six-element array that operates at 2.45 GHz frequency band and optimized to reduce size limit element coupling less than -20 dB. Analysis involves multiple-input multiple-output (MIMO) operation obtain diversity gain spectral efficiency. In addition, radiation efficiency antenna greater 65% bandwidth (more 30...

This paper presents novel low-cost single- and dual-band microstrip patch antennas. The proposed antennas are realized on a square etched symmetrically with four slots. antenna is designed to have low cost reduced size use in Internet of things (IoT) applications. provide reconfigurable architecture that allows operation different wireless communication bands. structure can be adjusted operate either single band or operation. Two prototypes implemented evaluated. first works at resonance...

This paper presents a new structure to implement compact bandstop filters by employing coupled DGS resonators etched in the ground plane. The proposed filter consists of symmetrical with microstrip excitation obtain response. By adjusting space S between two resonators, bandwidth can be easily controlled. A is designed, analyzed and implemented on FR4 dielectric substrate operate at 2 GHz. measured results are good agreement simulations.

This paper presents a new, compact, high-coding-capacity resonator suitable for applications in chipless RFID tags. These tags consist of multiple resonators and two cross-polarized ultra-wide band antennas. Each contains U-shaped coupled microstrip frame with isolated (K-1) legs inside. One the is designed to be connected U-frame via metallic strip order adjust its resonance frequency. Using this feature, frequency each can reconfigured equal one K-resonance frequencies. Therefore, K-states...

Abstract In this paper, a multi‐band compact H‐shaped microstrip antenna is studied. The resonant modes of the structure are analyzed using concept electric and magnetic walls at planes symmetry. A flexible design approach that allows pre‐selection frequencies described. Approximate equations curves introduced validated by simulated experimental results. An designed to support with resonance 2.2, 2.8, 3, 5 GHz. It shown dual‐, triple‐, or quad‐band operation possible proper location coaxial...

A novel and compact dual-polarized (DP) chipless radio-frequency identification (RFID) tag is presented in this paper. This can read both vertical horizontal orientations within its frequency band, which improves the robustness detection capability of RFID system. The proposed makes use slot length variation encoding technique to improve capacity. duplicate capacity, thereby reducing overall size by almost 50%. In particular, has an capacity 20 bits 3–8 GHz band achieves data density around...

Miniature microstrip stepped impedance resonator bandpass filters and diplexers for satellite mobile communications have been developed. A very high dielectric constant substrate (/spl epsiv//sub r/=89 h=2 mm) is used. Experimental results show that an unloaded half wave quality factor as 400 at 1.5 GHz, with such substrate, may be possible. The merit of this circuit lies in the simplicity design procedure, possibility developing filter quite a variety materials simulation most commercial...

In this paper, new multiband fractal-like antennas are proposed. The proposed antenna design is based on a methodology that utilizes the self transformation principle of fractal- like rectangular proflles to generate operation. monopole-type built partial ground plane and fed through microstrip feed line. analytical procedures straightforward can be applied any practical structure operate at multiple preselected bands. developed has been used operating three, four, flve Numerical simulations...

The recent growth in identification, tracking, and sensing applications for internet of things (IoT) has pushed the RFID technology to gain much attention due its remarkable advantages compared conventional identification techniques. A new chipless tag based on multiresonator is discussed this paper. proposed a data capacity 6-bits range 6.1 6.6 GHz with size 3.313×1.0225 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . density...

The success of next-generation Internet Things (IoT) applications could be boosted with state-of-the-art communication technologies, including the operation millimeter-wave (mmWave) bands and implementation three-dimensional (3D) networks. With some access points (APs) mounted on unmanned aerial vehicles (UAVs), probability line-of-sight (LoS) connectivity to IoT nodes augmented address high path loss at mmWave bands. Nevertheless, system optimization is essential maintaining reliable in 3D...

A compact single feed dual-band electronically tunable microstrip antenna for operation in GSM/DCS-1800 system is presented. The consists of two resonant elements designed separately and integrated while preserving their bands. bands are tuned using biasing control circuits. significant size reduction bandwidth selection achieved a varactor diode as voltage capacitance. design implementation carried out on foam substrate thickness 2.44 mm with dielectric constant 1.2. Simulation experimental...

This paper proposes a novel class of uniplanar coplanar waveguide (CPW)-to-slotline transitions, which is particularly suitable for monolithic millimeter-wave integrated circuits. Instead using CPW series stub printed in the ground plane, as case classical CPW-to-slotline transition, this shows capability to use center conductor CPW. Compared proposed transitions have following advantages: additional degrees freedom, lower radiation loss, larger bandwidth, higher compactness, and major...

In this article, based on nonuniform transmission lines, the design of compact multifrequency Wilkinson power dividers (WPDs) is presented. This accomplished by replacing quarter-wave uniform lines in conventional WPD multiband line transformers (NTLTs). The these NTLTs performed under even mode analysis WPD. A single isolation resistor used between two output ports whose value determined using simple odd For verification purposes, a triple-frequency and quad-frequency are designed,...

A novel quad-state coupled-line microstrip resonator is proposed for compact chipless radio frequency identification (RFID) tags. The can be reconfigured to present one of four possible states: 00, 01, 10, and 11, representing, no resonance, resonance at f2, f1, both f1 respectively. span between f2 easily controlled, thereby reducing the required spectrum. Moreover, technique allows storage a large amount data in size reduce cost per bit. multi-resonator prototype consisting six resonators...

A new nondegenerate dual-mode microstrip patch filter structure is introduced. The proposed based on a square with four slots etched in symmetrical form. Besides its simple structure, the has advantages of small size and low loss. full-wave IE3D package used to analyse structure. Design curves that relate mode resonance frequencies fractional bandwidth against slot parameters are presented. bandpass designed, analysed tested at 2.15 GHz. Experimental results show good agreement theoretical results.

This paper presents a design of GaN HEMT-based power amplifier (PA), with enhanced efficiency and linearity over the operation band from 0.5 to 1.5 GHz. The is based on wideband load-pull source-pull analysis. A novel procedure developed optimize impedance values synthesize matching networks. achieves drain 40%-68% added (PAE) 35.7%-63.8%, entire frequency measured for an input 24 dBm. To ensure flat gain response, high pass filter deployed at PA, thus achieving 13.8 ±1 dB band. Wideband...

A chipless RFID tag based on multiresonators is discussed in this paper. As a preliminary design the has data capacity of 3-bits range from 2 to 2.25 GHz. The proposed consists multiresonating spiral circuit and two orthogonally polarized ultra-wideband (UWB) monopole antennas for realizing cross polarization retransmission process. prototype designed Taconic TLX-8 substrate dielectric constant 2.55 thickness 0.787 mm. resonators are mainly type placed compact shape.

Abstract A novel tristate coupled line microstrip resonator is proposed for compact chipless radiofrequency identification tags. The can be reconfigured to present one of the three possible states: 00, 10, and 01, which denote no resonance, resonance at f 1 , 2 respectively. designed with appropriate positions, reducing required spectrum. multiresonator prototype consisting 14 elements designed, analyzed, experimentally characterized. This implemented on an RT Duroid 5880 substrate a...