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  1. BROADBAND SUSPENDED MONOPOLE PLANE ANTENNA (SPA)

    The design uses a suspended Z-type Strip Plate (ZSP) that serves as a radiator and impedance matching part, a thin air gap between the feed connector, and a radiator plane that serves as broadband impedance matching and main radiator part. The horizontal and vertical radiating patterns of the antenna have the same behavior across this band.



  2. RECTANGULAR OR CIRCULAR MONOPOLE ANTENNA

    A planar monopole may be realised by replacing the wire element of a conventional monopole with a planar element. In this case, the planar element which is square, is located above a groundplane and fed using an SMA or N-type connector.

    The circular disc monopole (CDM) antenna has been reported to yield wide-impedance bandwidth. New configurations are proposed such as elliptical (with different ellipticity ratios), square, rectangular, and hexagonal disc monopole antennas. A simple formula is proposed to predict the frequency corresponding to the lower edge of the bandwidth for each of these configurations.



  3. The Planar UWB Monopole Antenna

    A monopole antenna is known as an antenna that can implement low VSWR in wide bands. In a design where the height of the monopole unit is 1/4 the wavelength of the minimum frequency.



  4. Deployable Ground Plane with Shape Memory Alloy Hinges in the Directional Antenna

    New wireless communications and sensor observation technologies have been emerging at a dramatic pace over the last decade. The advanced requirements related to antenna suggest some form of advanced beam steering and beam forming capability. While phased array systems allow shaping of the antenna far-field pattern, the use of phased array technology in space has been somewhat limited. The reasons are the high weight, complexity and cost of phase array systems. The most common type of deployable antennas is the mesh antenna with a reflective surface composed of a knitted lightweight metallic mesh. Shape Memory Alloy Hinges (SMAHs) have been used in a wide variety of applications because of their unique thermomechanical characteristics.

    The SMA elements have been made in the following shapes:
    1. Straight wires in tension, for small linear motion/high force.
    2. Helical elements, for large linear motion/small force, or large rotation/small torque.
    3. Torsion bar/tube, for large rotation/small torque.
    4. Cantilever strips, for large displacement/small force.
    5. Belleville-type discs, for small linear motion/high force.



  5. CHIP ANTENNA FOR MOBILE PHONE HANDSET

    Dielectric substrate decrease radiated beamwidth and the gain. Firstly you have to solve without dieletric subtrate. IF you use the higher dielectric consant, you can see lesser BW and also low radiation efficiency.

    1. You can use another techniques such as fractal antennas.
    2. You can add slits or slots to the antenna, make electric current longer.
    3. The best antenna close to a patch is the annular ring (also called loop) antenna.

    Patch antenna resonates at lamda/2 distance. for loop antenna this is approximately lamda/4. if you make the width of the transmission line in loop antenna narrow, you can make its size smaller and smaller (since the currents flow approximately from the middle of transmission line).



  6. Printed monopole antenna which is composed of Y-shaped microstrip feed line with a pair of semicircle shaped parasitics.

    For ultra-wideband (UWB) applications. Printed monopole antenna structure for wireless applications in GSM, DCS, and wireless local area network applications, IEEE 802.11 industrial, scientific, and medical (ISM) band.



  7. BEAMFORMING ANTENNA

    Antenna Evolution;

    1. Early Technology; Omni diretional, Sectorized, Log Periodic Dipole
    2. Current Technology — Extensive Usage; Dual Pole & Elevtrical Tilt, Variable Tilt & Ret, Multiband 3. Current technology - Moderate Usage; Sector, Multibeam, Concealment & Integration 4. Beam Forming; Adaptive Array, MIMO, Reconfigurable Beam Antenna, Active Antenna System



  8. HIGH-POWER MICROWAVE WIDEBAND ANTENNA

    The capabilities of High Power Microwaves (HPM) and UWB weapons are the reason for intensive research activities in the area of microwave sources, components and antennas. The standard Impulse Radiating Antenna (IRA) is a reflector type antenna with the ability to radiate broadband pulses with a high directivity. Impulse Radiating Antenna (IRA) that consists of a TEM-horn-fed parabolic reflector that is directly driven by a Marx generator.
    High Power Spark Gap Switched Oscillator.
    UWB Impulse Radiating Antenna. For military applications it is of interest to affect distant targets with short electromagnetic pulses of high amplitude and a broad spectral content from 100 MHz to several GHz which are known as Ultra Wide Band Pulses (UWB). The standard Impulse Radiating Antenna (IRA) is a reflector type antenna with a high directivity.

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