The characteristics of a small antenna using an H-shaped
microstrip patch are studied. Significant reduction of antenna size can
be realized when the H-shaped patch is used instead of the conventional
rectangular microstrip patch antenna. The theoretical analysis is
carried out based on the finite-difference time-domain (FDTD) method.
The FDTD programs are developed and validated by available measurement
results. The effects of various antenna parameters on the resonant
frequency and radiation patterns are shown. Several design curves are
presented and the electric current distributions on the patch and ground
plane are described. This antenna is suitable for applications where
small size and broad beamwidth are required
"- During the last two decades, microstrip patch antenna has received considerable attention for use in staff communication systems and synthetic aperture radar applications because of their compactness among other advantages. Intensive research has been carried out with develop new techniques to overcome the patch microstrip -  antennas drawbacks, the most restrictive to be narrowband. "
[Show abstract][Hide abstract] ABSTRACT: The microstrip antennas area has seen some inventive work in recent years and is now one of the most dynamic fields of antenna theory. A novel and simple wideband monopole antenna is presented printed on a single dielectric substrate which is fed by a 50 ohm microstrip line having a low-profile antenna structure with two parallel s-shaped meandered line of same size. This antenna is fed by a coaxial feeding tube. In this research, S–form microstrip patch antenna is designed from measuring the prototypes of the proposed antenna one available bands with 10db return loss bandwidths of about GPS application (GPS L2 1490 MHz) and covering the 1400 to 1580 MHz frequency band at 1.5 GHz, the simulated results for main parameters such as return loss, impedance bandwidth, radiation patterns, and gains are also discussed herein. The modeling study shows that such antennas, in simplicity design and supply, can satisfy GPS application. Two parallel slots are incorporated to disturb the surface flow path, introducing local inductive effect. This antenna is fed by a coaxial feeding tube.
World Academy of Science, Engineering and Technology, Boston; 04/2015
[Show abstract][Hide abstract] ABSTRACT: In the present paper notch loaded shorted microstrip patch antenna has been analysed using cavity model. The proposed antenna shows dual band operation which depends on notch dimensions as well as shorting wall. The frequency ratio is found to be 1.5278 for the notch loaded rectangular patch, while in notch loaded shorted patch, the frequency ratio varies from 2.9764 to 2.725 for increasing value of notch width and it is almost invariant with notch depth. Further a slot loaded shorted patch antenna shows the dual frequency nature with the frequency ratio 1.7. The theoretical results are compared with IE3D simulation as well as reported experimental results.
[Show abstract][Hide abstract] ABSTRACT: With developing technology, interest in wireless communication in recent years leads to rapid developments in antenna technology. Particularly, personal portable devices have seen intense interest. In addition, aircraft, space vehicles, radar, satellite and missile applications are growing at a greater rate. Therefore, Microstrip Antennas (MSA) which used in these devices have gained importance. Compact Microstrip Antennas are created by modification of traditional antenna?s shapes which are rectangle, circle and triangle. The H-shaped MSA are formed by modification of the Rectangular Microstrip Antenna (RMSA)�In this study, the H-Shaped MSAs with different physical and electrical parameters have designed. These antennas have been simulated in XFDTD which is a 3-D simulation program. A new equation which approximately gives the resonance frequency values obtained by simulations has been trying to find by using Differential Evolution Algorithm (DEA). Beside this, coefficients of the equation have been found by optimization used DEA. Finally, a new and simple equation which gives the close result of Simulation Programs has been found.
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