A new scheme is proposed for the dual-band operation of Wilkinson power divider/combiner. The dual band achieved by attaching two central transmission line stubs to conventional divider. It has simple structure and suitable distributed circuit implementation.

A compact frequency-reconfigurable multipleinput-multiple-output (MIMO) antenna on a laptop is proposed for multiband LTE services. Each MIMO consists of two planar inverted-F (PIFA) elements, using T-shaped dc line and p-i-n diodes (D1 D2), in conjunction with the proximity-coupled feed structure. By effectively minimizing its dimension interference performance, designed to fit within The covers 17/13 bands (704-787 MHz, VSWR <; 3) at State 1 D2: ON state), 20/7 (791-862 2500-2690 2 OFF...

A compact (100 mm × 100 40 mm) dual-polarized antenna with wide impedance bandwidth and high isolation is proposed for an indoor MIMO wireless communication system. The consists of cavity-backed bowtie antennas parasitic elements. It can cover the DCS/PCS/UMTS/LTE 1, 2, 3, 4, 7, 9, 10, 15, 16, 23, 25 bands (1710-2690 MHz). (VSWR <; 2), about 44.5%, achieved by using elements optimal location length cavity electrical wall. High-isolation (>31 dB) low-envelop correlation coefficient (ECC...

A novel branch line coupler structure is proposed with application to the dual band operation. The has additional cross coupling branches conventional hybrid coupler. Additional design freedom can be obtained using scheme, which serve many useful purposes such as operation of

A new technique to reduce the overall dimension of a microstrip antenna using partially filled high-permittivity substrate is proposed. The miniaturized for repeater system in mobile communication cellular band (824-894 MHz) designed with proposed and manufactured light weight small size. Comparison between simulations, based on HP HFSS software, measurements are provided.

A new branch-line coupler structure with port extensions is proposed for the dual-band operation. The conventional adapted to operation by inserting a transmission line section at input ports and modifying branch parameters. performance of verified theoretically through rigorous microwave circuit analysis exact design equations are derived in concise form. design, simulation, measurement results validate capability same quadrature phase relation between two band frequencies.

A novel structure of a near-field communication (NFC) antenna for mobile handset is proposed by changing the sequence loop winding and modifying inner structure. In general, sintered ferrite sheets with higher relative permeability (μr ≈ 200) have been used to reduce performance deterioration NFC antennas due eddy current in battery pack handset. However, their costs are high, they considerably breakable. this letter, we effectively enhance an employing ferrite-polymer composite lower 55)....

Abstract A novel UHF band RFID tag antenna, which can be effectively mounted on metallic objects, is presented. Using the inductively coupled feeding technique, proposed antenna consists of two symmetric shorted radiating elements and loop. The loop excited so that currents are out phase with equal amplitude. gives smaller variation performance than conventional antennas when various sizes objects. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 414–416, 2007; Published online...

Abstract A new type of a compact tag antenna, which can be effectively mounted on metallic objects, is proposed for UHF band RFID systems. The antenna consists simple microstrip path and feed line, it fabricated very thin (1.6 mm) subtrate compared with previous works. impedance the easily adjusted to match various values chips by simply changing length line only. analyzed simulations Ansoft HFSS software, measured results based backscattering method are provided. © 2007 Wiley Periodicals,...

In this letter, we propose a broadband reconfigurable antenna for aircraft communication that covers the VHF/UHF/L-bands (30-300/300-400/960-1220 MHz). The proposed structure is modified biconical unipole antenna. frequency-reconfigurable using p-i-n diode switch. on state, operates as V-type traveling and 30-300 960-1150 MHz. off 300-400 1150-1220 maximum power dissipation of 18 W. has VSWR <; 2.5 all bands. Antenna gain less than 1.8 dBi at 30-400 MHz 960-1220

In this letter, a reconfigurable radiation pattern antenna for multiple-input-multiple-output (MIMO) applications on mobile devices is proposed. The operating frequency band of the 5.15-5.35 GHz wireless local area network (WLAN) 802.11a service. Each composed loop-and-dipole structure, as well two switches pattern, to generate beam in three different directions. proposed designed have an orthogonally directional with high isolation and low-correlation coefficient MIMO environment.

A compact ultrawideband (UWB) antenna with a band-notch function is proposed for laptop applications. The realized by half-wavelength parasitic element printed on the rear side of substrate. impedance bandwidth (VSWR < 2) 3.1 ~ 11.4 GHz (114%) notched frequency from 5.05 to 5.90 GHz. has fairly good omnidirectional pattern, and average gain -3.0 -1.2 dBi over UWB band except band. performance confirmed simulation measurement results.

A circularly polarized (CP) broadband microstrip patch antenna array is proposed for high-data-rate wireless personal area network (WPAN) systems of around 60 GHz. The consists a 4 × element with an edge-coupled parasitic structure and novel series sequential rotation feeding network. Instead low-temperature co-fired ceramic technology, single-layer the fabricated by conventional printed circuit board process, to provide low manufacturing cost profile (0.05 λ <sub...

A compact (60 × 15 5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ) mobile handset multiple-input-multiple-output (MIMO) antenna for LTE 13 band (746-787 MHz) applications is proposed. The consists of two symmetrical planar inverted-F antennas (PIFAs) in conjunction with a T-shaped common radiator. Without using any additional coupling elements between these closely mounted antennas, both high isolation ( > 17 dB) and low envelope...

Abstract A new design method of single‐stub impedance matching networks is presented for the dual‐band application. The operating conditions are analyzed in detail and equations derived concise form different locations termination types stub line. proposed scheme successfully applied to a stubbed T‐junction power divider. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1359–1362, 2010; Published online InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25201

A new impedance transforming balun scheme is presented based on the branch line structure with stubs vertical branches. The stubbed eliminates unwanted even mode output and provides only required opposite phase. Also, use of reduces lengths by two times stub length therefore, helps to reduce total size proposed

A folded and bent internal loop antenna (FABILA) suitable for multiband operation is presented. The proposed consists of a radiating element the structure with rectangular stub, feeding post, shorting dielectric supporter on experimental PCB. shorted half-wavelength resonates at lower-frequency band, higher-band achieved by two adjacent higher modes. Especially second higher-order mode, stub compensates strong imaginary part input impedance efficiently, so that can provide enough bandwidth...

A new 0°/180° ring coupler structure is proposed for the arbitrary power division ratios. The consists only of 50 Ω transmission lines with simple structure. electrical lengths branches are adjusted to obtaining any desired values ratio without changing impedance. very wide range ratios can be obtained easily line based

The RF front-end performances in the far-field condition of reconfigurable antennas employing two commonly used switching devices (PIN diodes and RF-MEMS switches) were compared. Two types (monopole slot) representing general direct/coupled feed for to compare excited power switches by antenna types. For operation antennas, a biasing circuit was designed embedded same board, which included battery emphasize antenna’s adaptability mobile devices. measurement results each (radiation patterns...

A novel compact quad-band internal antenna for mobile handsets operating the GSM (880–960 MHz), GPS (1575 ± 10 DCS (1710–1880 and PCS (1850–1990 MHz) bands is proposed implemented. The consists of a feeding strip, shorting folded loop radiating element with embedded tuning notches. Embedding notches changes current flow on surface radiator so that resonant frequencies can be controlled independently by their size position. measured impedance bandwidth (VSWR < 2) 11.3% at band 27.4% higher...

Abstract A compact mobile handset multiple‐input multiple‐output (MIMO) antenna for LTE700 applications is proposed.The proposed consists of two side‐to‐side printed symmetrical inverted‐F antennas (PIFAs), a capacitively coupled feed, suspended line, and branch line. wide impedance bandwidth at relatively lower frequency achieved with the feed. Good isolation (&gt;12 dB) low correlation coefficient (&lt; 0.1) between MIMO are obtained by adding line in conjunction © 2010 Wiley Periodicals,...

A new structure of an NFC loop antenna for mobile handset applications is proposed. The proposed consists conventional elements and a parasitic embedded capacitor to enhance its performance. Although the sintered ferrite sheets with higher relative permeability<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:msub><mml:mi>μ</mml:mi><mml:mi>r</mml:mi></mml:msub><mml:mo>≈</mml:mo><mml:mn>200</mml:mn></mml:mrow><mml:mo...

In this study, a wideband patch array antenna for high-frequency 5G wireless communication is proposed. The needed to handle the increase in data traffic. proposed antenna, 2 × 16 element with gap-coupled parasitic elements and multi-section or stepped transformer feeding network feed cover prevent unwanted radiation, can new radio (NR) n257 (26.5–29.5 GHz), n258 (24.25–27.5 n261 (27.5–28.35 GHz) bands. Using single substrate instead of cavity stacked structures, wide impedance bandwidth (dB...

Excellent efficiency of a linearly polarized microstrip array in Ku-band is achieved by having proper impedance matching throughout the and properly using corporate series fed transmission lines. The cavity-backed patch used to obtain relatively wide bandwidth. auto-tracking antenna azimuth direction has developed with very low profile for vehicle's rooftop mounting, as well as, manufacturing cost. main beam tilted 15/spl deg/ away from broadside provide optimum coverage Korea satellite III.

A compact multiband handset antenna including MIMO operation for LTE 13 band (746 ∼ 787 MHz) applications is proposed.The proposed antennas are separately located on the top and bottom portions of a mobile in order to use area more effectively.The achieves isolations higher than 14 dB, enveloped correlation coefficients (ECC) less 0.25, total efficiencies greater 40%.The operating frequency bands Antenna 1 2 include MHz)/DCS/PCS/UMTS (1710 2170 MHz)/GSM850/900 (824 960 bands, respectively.