Communications: radio wave antennas – Antennas – Logarithmically periodic
Patent
1995-04-04
1996-07-30
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Logarithmically periodic
343701, 343754, H01Q 1110
Patent
active
055416144
ABSTRACT:
An antenna system includes a set of symmetrically located center-fed and segmented dipole antennas embedded on top of a frequency selective photonic bandgap crystal. A two-dimensional array of microelectromechanical (MEM) transmission line switches is incorporated into the dipole antennas to connect the segments thereof. An MEM switch is located at the intersection between any two adjacent segments of the antenna arm. The segments can be connected (disconnected) by operating the switch in the closed (open) position. Appropriate manipulation or programming of the MEM switches will change the radiation pattern, scanning properties and resonance frequency of the antenna array. In addition, an MEM switch is inserted into the crystal to occupy a lattice site in the 3-dimensional crystal lattice. The crystal will have a broadband stopgap if the MEM switch operates in the closed position (perfect symmetry of the crystal), and will produce a narrowband absorption line inside the stopgap if the MEM switch is in the open position, thereby permitting change in real time of the frequency response of the crystal.
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Abrams Richard L.
Lam Juan F.
Tangonan Gregory L.
Denson-Low W. K.
Duraiswamy V. D.
Hajec Donald T.
Hughes Aircraft Company
Phan Tho
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