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Microstrip fed slot antenna design

Microstrip slot antenna is simple in structure. It consist of microstrip feed that couples electromagnetic waves through the slot above and slot radiates them. A simple new design method to achieve a dual band microstrip-fed slot antenna is presented. It is shown that when two slot antennas are placed in series, the spacing between the two antennas . A new design for a microstrip-fed slot antenna (MFSA) is proposed and developed for improving bandwidth, gain and reducing back radiation. In contrast with most unidirectional MFSA, a metasurface as a superstrate is employed to reduce the back-lobe radiation and enhance the gain without a metal reflector.

US5955997A - Microstrip-fed cylindrical slot antenna - Google Patents

It should be appreciated that this antenna structure does not disclose a slot disposed through the cylinder. While the above description has focused on GPS systems, it should be appreciated that this inventive concept may be utilized in any type of system where it is desirable to have a right-hand circular polarization and a uniform pattern coverage over approximately the entire upper hemisphere. Radiating slot 18 is modeled by two short-circuited slot lines 26,28 which are loaded with a radiation resistance R s , representing radiated power from radiating slot Sabri and Z. The microstrip feed line 20 crosses radiating slot 18 and is short-circuited through a dielectric substrate

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A Hexagonal Shape Microstrip Slot Antenna for Wideband and Multiband Applications.

Abstract- Here in this paper a compact microstrip antenna having wide-slots of hexagon shape is fed by microstrip-line for wideband and multi band operations is proposed and studied. The proposed antenna resonates the dB bandwidth from 0 to 6.

GHz 2. Detailed design and experimental. The antenna is simulated using IE3D electromagnetic simulator. Microstrip patch antennas are low profile, conformable to planar and non planar surfaces, simple and less expensive in manufacturing using modern printed circuit technology. The main objective in the wireless communication system is the design of wideband or even multiband low profile and small antenna. One such antenna that meets these requirements is the slot Antenna [1].

There are numerous techniques such as shorting pins, introducing slots and fractal geometries that reduce the size of the patch antenna. Micro strip slot antennas MSAs have the advantages of being able to produce bidirectional and unidirectional radiation patterns with larger bandwidth and very low cross polarization typically dB as compared to microstrip patch antenna [2].

In, Microstrip slot antenna, the strip and slot combination offer an additional degree of freedom in the design of microstrip antennas. A microstrip slot antenna comprises a slot cut in the ground plane of the micro strip line such that the slot is perpendicular to the strip conductor of the microstrip line. The field of the microstrip line excite the slot.

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Details

The evolution of satellite communication networks has proceeded from the design and development stage to actual working systems within the last decade. The Global Positioning System GPS is one of the major accomplishments realized in systems utilizing satellite communication.

One area in which these GPS systems are utilized is in aircraft avionics. The commercial GPS user equipment for aircraft networks requires an antenna that can provide a right-hand circular polarization and a uniform pattern coverage over approximately the entire upper hemisphere.

The uniform amplitude response over a wide coverage region allows the receiver to maintain signal lock to satellites with a useful signal-to-noise ratio. Because a high-speed aircraft constantly changes its look angle to satellites, the wide beamwidth coverage allows the receiver to track as many of the visible satellites as possible and maintain the system's proper Geometric Dilution of Precision GDOP. Also, a mechanical configuration that has no appreciable drag and requires no elaborate structural modification to the aircraft is another leading concern of airborne terminal in a satellite-to-air communication link.

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Slot antennas are useful in applications where low-profile or flush installations are required on a high-dynamic aircraft. Electronics Conf. The physical structure of the slotted cylinder antenna proposed by Alford consists of a slotted sheet metal bent into a cylinder.

He described this type of vertical slotted cylinder as a resonant transmission line with a sufficient number of shunt loops. As shown in FIG. It should be appreciated that most of the current flows in the horizontal loops 12 around the cylinder due to the sufficiently low impedance of a circumference path around cylinder A coaxial feed 14 is provided for delivering current to a radiating slot 16 as illustrated in FIG.

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