The characteristics of a rectangular microstrip antenna with an L-shaped probe are investigated. A foam layer thickness around 10% the wavelength is used as supporting substrate. An impedance bandwidth 35% and average gain 7.5 dBi can be achieved. radiation pattern stable across passband.

Experimental and simulation results are presented on the coaxially fed rectangular patch antenna with a U-shaped slot. include impedance bandwidth, copolar- crosspolar-pattern characteristics gain measurements. Simulation obtained mainly through development of FDTD code. It is found that U-slot foam substrate about 0.08λ thick can be designed to attain 20–30% as well bandwidths without need parasitic patches another layer or same layer. The far-field patterns have good copolar crosspolar...

In this paper, stringent requirements imposed on the design of base station antennas for mobile communications are summarized. Conventional techniques implementing reviewed. The complementary antenna concept combining an electric dipole with a magnetic is reconsidered. Recently, kind has been commonly called "Huygen's source." purpose to develop wideband unidirectional stable frequency characteristics and low back radiation. Based concept, magnetoelectric was invented by integrating -probe...

A novel dual-polarized magneto-electric dipole antenna excited by two -shaped strips is presented. The achieves a common impedance bandwidth of 65.9% (SWR < 2) at both input ports. has excellent performance in isolation, which more than 36 dB between the ports, and gain about 9.5 dBi. radiation pattern over operating frequency band are very stable.

A novel circularly polarized (CP) aperture-coupled magneto-electric (ME) dipole antenna is proposed. The CP MEdipole fed by a transverse slot etched on the broad wall of section shorted-end substrate integrated waveguide (SIW) convenient to integrate into substrates. An impedance bandwidth wider than 28.8%, wide 3-dB axial ratio (AR) 25.9%, and gain 7.7 ± 1.4 dBic over operating band are achieved. Additionally, since radiation generated combination two orthogonal ME-dipole modes, element has...

A dual-polarized aperture-coupled magneto-electric (ME) dipole antenna is proposed. Two separate substrate-integrated waveguides (SIWs) implemented in two printed circuit board (PCB) laminates are used to feed the antenna. The simulated -10-dB impedance bandwidth of 21% together with an isolation over 45 dB between input ports. Good radiation characteristics, including almost identical unidirectional patterns orthogonal planes, frontto-back ratio larger than 20 dB, cross-polarization levels...

A novel substrate integrated waveguide (SIW)-fed end-fire magnetoelectric (ME) dipole antenna is proposed. The consisting of an open-ended SIW and a pair electric dipoles has simple structure that can be into substrates conveniently. Both the are effectively radiated together. Excellent performance, including bandwidth 44%, symmetrical radiation patterns almost identical in two orthogonal planes, low backward radiation, cross polarizations, stable gain around 5 dBi, wide beamwidth 110°, also...

A low-cost single-layer wideband microstrip antenna array is presented for 60-GHz band applications. Each radiation element fed by a modified L-shaped probe to enhance the impedance bandwidth. The proposed excited novel coplanar waveguide (CPW) feed network, which not only has simple structure abandoning traditional air bridges (wire bonds) above CPW T-junctions but also provides pairs of broadband differential outputs. Experimentally, two 4 × arrays with different polarizations were...

Cavity-backed patch antenna arrays with full corporate substrate integrated waveguide (SIW) feed networks are demonstrated at V-band for applications the needs of highgain antennas. A prototype 16 × radiating elements a transition is fabricated by applying standard printed circuit board (PCB) facilities. gain up to 30.1 dBi 3-dB bandwidth 16.1%, an impedance 15.3% SWR <; 2, and symmetrically broadside radiation patterns -40 dB cross-polarizations achieved. The performance proposed array also...

The L-shaped probe is shown to be an attractive feed for the thick microstrip antenna (thickness around 10% of operating wavelength). A parametric study on rectangular patch presented. It found that attains 36% impedance bandwidth (SWR/spl les/2) as well gain and about 7-dBi average gain. two-element array fed by L-probes also proposed. Experiments show design can substantially suppress cross polarization proposed antenna. Both antennas have stable radiation patterns across passband....

A broad-band U-slot rectangular patch antenna printed on a microwave substrate is investigated. The dielectric constant of the 2.33. fed by coaxial probe. characteristics are analyzed finite-difference time-domain (FDTD) method. Experimental results for input impedance and radiation patterns obtained compared with numerical results. maximum bandwidth achieved 27%, centered around 3.1 GHz, good pattern characteristics.

An experimental study of a dual-polarized L-probe patch antenna is presented. The designed to operate at around 1.8 GHz. A "dual-feed" technique introduced achieve high isolation between two input ports. proposed has an impedance bandwidth 23.8% (SWR/spl les/2), 15% les/1.5) and over 30 dB. In array designs, techniques for improving the adjacent elements are also investigated. two-element with more than dB tested.

The U-slot patch antenna, a single-layer single-patch antenna on relatively thick substrate (/spl sim/0.08/spl lambda//sub 0/), is wide-band with an impedance bandwidth in range of 20%-30%, which about order magnitude larger than that the regular antenna. Recently, it was shown half one dimensions patch, maintains similar behavior. half-structure also successfully applied to shorting wall. In this paper, new results structures, not previously published, are presented. First, pin technique...

The performance of single feed truncated corner circularly polarized microstrip antennas with different substrate thickness is studied by simulation and experiment.It found that the axial ratio bandwidth could be enhanced considerably when a thicker used, provided U-slot and/or L-probe used to effect impedance matching.One configurations attains an (< 3 dB) about 14% within matching band 0.2λ o .

In this paper, the finite-difference time-domain (FDTD) method is employed to analyze L-probe proximity-fed rectangular patch antennas. Numerical results for input impedance, co- and cross-polarization radiation patterns are presented compared with measurements. Good agreement between computed measured obtained. The effects of geometric parameters on characteristics antenna extensively studied. For design purposes, variation impedance at resonance different plotted a Smith chart. Mutual...

Several designs for small-size wide-bandwidth microstrip antennas are examined through simulation and experiment. Designs presented based on two wideband patch antennas: the U-slot antenna, L-probe-fed antenna. techniques utilized to reduce resonant length of these microstrip-patch increasing dielectric constant microwave substrate material, addition a shorting wall between conducting ground plane, pin plane. Simulation experimental results confirm that size can be reduced by as much 94%,...

A hemispherical dielectric resonator antenna fed by a coaxial probe is studied both theoretically and experimentally. The Green's function for the evaluation of input impedance derived rigorously expressed in form convenient numerical computations. method moments used to obtain current from which DR calculated. Both delta gap magnetic frill source models are considered. Moreover, results using reduced kernel as well exact presented. entire basis (EB) piecewise sinusoidal (PWS) expansion...

A novel circularly polarized (CP) antenna with wide angular coverage is presented. The proposed formed by two bowtie patch antennas and electric dipoles. It can achieve an impedance bandwidth (SWR < 1.6) of 41% a 3-dB axial ratio 33%. For this design, very stable symmetrical radiation patterns are obtained. In the passband, beamwidth 85 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">deg</sup> plusmn2 gain 6.3 dBi plusmn0.3 dBi. cross...

An analysis is presented of a thin cylindrical-rectangular microstrip patch antenna. After obtaining the electric field under curved and resonant frequencies using cavity model, far-field found by considering equivalent magnetic current radiating in presence cylindrical surface. The input impedance total Q-factor are then calculated. Numerical graphical results to illustrate effect curvature on characteristics TM/sub 10/ 01/ modes.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A low-cost high-gain and broadband substrate integrated waveguide (SIW)-fed patch antenna array is demonstrated at the 60-GHz band. single-layered SIW feeding network with wideband T-junctions cavity-backed antennas are employed to achieve high gain performance simultaneously. Although proposed has a multilayered structure, it can be fabricated by conventional printed circuit board (PCB) technology then realized stacking fixing all of single layers together. The simulated measured impedance...

A circularly polarized rectangular stair shaped dielectric resonator antenna (DRA) is presented. The DRA excited by a narrow slot and rotated 45/spl deg/ with respect to the sides of generate circular polarization. parametric study length width ratio optimize axial bandwidth given. 3 dB 10.6% achieved when 1.9.

A plusmn45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">deg</sup> dual-polarized magneto-electric dipole loaded with dielectric substrate is presented. This antenna composed of shorted-circuited patches and planar dipoles fed by four Gamma-shaped probes. The height a prototype operated at 1.9 GHz only 24 mm (0.15lambda <sub xmlns:xlink="http://www.w3.org/1999/xlink">o</sub> ). wide impedance bandwidth 24.9% achieved. average gain about 8.2...

A new low-profile magneto-electric dipole antenna composed of a horizontal planar and vertically oriented folded shorted patch is presented. The simply excited by coaxial feed without the need an additional balun. rectangular cavity-shaped reflector introduced for enhancing stability in radiation pattern over operating frequencies. parametric study performed providing practical design guidelines. prototype with thickness 0.173λ was designed, fabricated measured. Results show that impedance...