A planar microstrip-fed super wideband monopole antenna is initially proposed. By embedding a semielliptically fractal-complementary slot into the asymmetrical ground plane, 10-dB bandwidth of 172% (1.44-18.8 GHz) achieved with ratio >;12:1. Furthermore, proposed also demonstrated wide 14-dB from 5.4 to 12.5 GHz, which suitable for UWB outdoor propagation. This able cover DVB-H in L-band (for PMP), DCS, PCS, UMTS, Bluetooth, WiMAX2500, LTE2600, and bands.

A single-feed reconfigurable square-ring patch antenna with pattern diversity is presented. The structure has four shorting walls placed respectively at each edge of the patch, in which two are directly connected to and others via pin diodes. By controlling states diodes, can be operated different modes: monopolar plat-patch normal modes; moreover, 10 dB impedance bandwidths modes overlapped. Consequently, proposed allows its radiation switched electrically between conical broadside...

A dual-feed dual-polarized microstrip antenna with low cross polarization and high isolation is experimentally studied. Two different feed mechanisms are designed to excite a dual orthogonal linearly-polarized mode from single radiating patch. One of the two modes excited by an aperture-coupled feed, which comprised compact resonant annular-ring slot T-shaped line; while other pair meandering strips 180deg phase differences. Both operate at 2400 MHz frequency band, measured results, it found...

A single-fed reconfigurable microstrip antenna that can provide various polarization diversities is presented in this paper. The excited by a feed line through aperture coupling. When two PIN diodes are used to respectively reconfigure the coupling slot and open stub of line, be switched between vertical horizontal polarizations. For with linear diversity, it converted circularly-polarized switchable sense introducing perturbation segment. Moreover, an quadri-polarization including dual...

A simple design for circularly-polarized (CP) annular slot antennas is first described. The antenna fed by a V-shaped coupling strip loaded with small resistance, and it can generate CP radiation as long the inclined angle of properly adjusted. Numerical analyses to effects varying on axial ratio are performed. Several prototypes fabricated. Both simulated measured results demonstrate that proposed feeding mechanism give good performances case width varied from 0.008 0.09 λ <sub...

A new design of a circularly polarized square-ring slot antenna is proposed. The circular polarization achieved by series microstrip-line-feed configuration coupling to two orthogonal sides the slot. parametric study conducted using commercial simulation software based on method moments, and procedure established. required ground-plane size proposed for given frequency also indicated. Three prototypes respectively operated at distinct bands are constructed measured providing validation....

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A design is described of a broadband circularly-polarized (CP) slot antenna. conventional annular-ring antenna first analyzed, and it found that two adjacent CP modes can be simultaneously excited through the proximity coupling an L-shaped feed line. By tuning dimensions this line, coupled together broad bandwidth thus formed. The method also valid when inner circular patch vertically raised from...

A reconfigurable design for a dual-feed square-ring microstrip patch antenna is described. The dual feeds are used to excite two orthogonal modes of the antenna, and each feed network composed coupling patch, an impedance transformer, variable capacitor. In addition, connected single input port through T-junction power divider. proposed can perform polarization diversity at different frequencies by tuning capacitance values capacitors. prototype integrating with pair varactor diodes related...

A design for arrays with beam-steering capability in the azimuthal plane is described. The array a four-sector antenna configuration, and each sector element can generate unidirectional radiation circular polarization (CP). reconfigurable 1×4 power divider broadband operation designed used to excite elements. By controlling PIN diodes, offer 11 states four outputs, state corresponding one CP pattern of array. Prototypes tunable are, respectively, constructed, experimental results integrated...

The design of an aperture-coupled annular-ring microstrip antenna for circular polarization (CP) is presented. CP radiation the achieved by a series microstrip-line-feed configuration through coupling ring slot in ground plane. key parameters proposed are investigated using commercial simulation software based on Method Moments to show how obtain 50 /spl Omega/ input impedance and optimum axial ratio. can be applied antennas with different inner radii substrate thickness, several prototypes...

A compact design of a single-feed circularly polarised (CP) microstrip antenna with relaxed manufacturing tolerances is presented. The CP operation the achieved using cross slot embedded on radiating patch. By cutting an additional ground plane, not only operating frequency can be decreased but also slot-length ratio patch considerably increased. In addition, performance proposed design, such as bandwidth and peak gain, have no significant reduction.

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this communication, a dual-feed dual-polarized microstrip antenna with low cross polarization and high isolation is experimentally studied. Two different feed mechanisms are designed to excite dual orthogonal linearly polarized mode from single radiating patch. One of the two modes excited by an aperture-coupled feed, which comprises compact resonant annular-ring slot T-shaped feedline; while...

A design for polarization-diversity slot antennas with switchable frequency is described. The antenna structure mainly composed of a radiating annular backed reflector and quasi-lumped coupler two different operating modes, quadrature hybrid mode T-junction power divider mode. resonant the frequencies modes can be tuned variable capacitors. First, effects changing capacitance values on performances are respectively analyzed. Then, according to simulation results, validated experiments,...

A design of single-feed dual-frequency patch antennas with different polarizations and radiation patterns is proposed. The antenna structure composed two stacked patches, in which the top a square bottom corner-truncated square-ring patch, patches are connected together four conducting strips. Two operating frequencies can be found structure. radiations at lower higher broadside pattern circular polarization conical linear polarization, respectively. prototype 1575 2400 MHz bands...

A design of stacked square-ring patch antennas with quadri-polarization diversity is proposed. The polarization switching realized a 1-to-4 reconfigurable feeding network composed quasi-lumped coupler and PIN diodes. size the less than 0.01λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> <sup xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , where λ free-space wavelength operating frequency. In addition, by controlling dc voltages,...

A simple design of circularly-polarized (CP) microstrip antennas with frequency agility is described. The reconfigurable antenna composed a square radiating patch, four varactor diodes, and two lumped capacitors. With coaxial probe, orthogonal resonant modes the patch are simultaneously excited. When equivalent capacitance values varactors increased, frequencies decreased, at same time capacitors specific value introduced to produce difference between so that CP operating can be generated...

A design for antennas with quad-polarization diversity is described. The antenna structure mainly composed of a reconfigurable crossed-dipole fed coaxial baluns and switchable feeding network. By controlling the states p-i-n diodes embedded in balun feeds, crossed dipole can generate vertical horizontal polarization radiations, phase each mode be switched between 0° 180°. As network, it has four output ports only two are set to active excite at time. integrating resultant provide modes,...

This paper presents the performance of a single-feed triangular planar inverted-F antenna with V-shaped slot. Several prototypes proposed antennas different shorting-wall widths are studied experimentally. The obtained results show that, by selecting proper width, not only has dual-frequency characteristic but also can achieve impedance bandwidth more than 30% in higher operating frequency band. In addition, radiation pattern across entire is measured and discussed.

The designs of dual-band and wide-band microstrip patch antennas with conical radiation patterns are presented in this paper. antenna is composed a square-ring that shorted to the ground plane through four shorting walls. Three resonant modes can be simultaneously excited structure by patch-loaded coaxial probe inside patch, they designed as operation. Moreover, adjusting width walls, three coupled together realize From obtained results, 10 dB impedance bandwidths at lower higher operating...

A design method is described for reconfigurable circularly-polarized (CP) microstrip array antennas with conical-beam radiation. The proposed antenna structure consists of four L-shaped patch arranged in a square-ring formation. Each shorted to the ground plane through conducting walls. With top-loaded monopole feed, two orthogonal resonant modes, loop mode and mode, can be excited simultaneously. effects shorting walls on frequencies modes are investigated, it found that frequency ( <i...

A 2 × array with pattern and polarization diversities is presented. The radiating element of the a stacked annular-ring microstrip antenna where four p-i-n diodes are symmetrically placed in inner slot lower ring patch. By, respectively, activating these diodes, can generate broadside radiations different directions, including φ = +45°, -45°, +135°, -135°. When reconfigurable elements fed 1 4 Wilkinson power divider, resultant give +45° -45° linear polarizations as well conical vertical...

The design of a square-ring microstrip antenna with circular polarisation (CP) is presented. To compact the size and overcome high impedance problem, CP excited by coupling strip located inside patch. Several prototypes antennas various substrate thickness (0.013–0.09λ0) have been constructed studied experimentally, their coupling-strip designs performance are described.

A new design of a monopolar plate-patch antenna is proposed and experimentally studied. The planar rectangular monopole top-loaded with shorted square or circular patch, which to the ground by two plates placed symmetrically on each side monopole. Prototypes have been constructed experimental results show, that an height less than 10% free-space wavelength center operating frequency, can radiation pattern impedance bandwidth larger three times corresponding wire-patch antenna.

The complex resonant frequencies of the cylindrical-rectangular microstrip structure loaded with a dielectric superstrate layer is studied using rigorous full-wave analysis, and numerical results are obtained Galerkin moment method calculation. convergence for selected sinusoidal basis functions without edge singularity condition also discussed. Numerical dependence real imaginary parts on permittivity thickness calculated analyzed, compared those planar structure.< <ETX...

Effects of uniaxial anisotropy in the substrate on complex resonant frequency microstrip patch antenna are investigated terms an integral equation formulation. The is calculated using Galerkin's method to solve equation. sinusoidal functions that selected as basis functions, which show fast numerical convergence. Numerical results indicate both and half-power bandwidth increased due positive decreased negative anisotropy.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...