Abstract: A modular wideband antenna element for connection to a feed network. There is a ground plane, and first and second flared fins above the ground plane. The fins each define a connection location that is relatively close to the ground plane and tapering to a free end located farther from the ground plane. The connection location of the first fin is electrically coupled to the feed network and the connection location of the second fin is electrically coupled to the ground plane. There are one or more additional first traces electrically connecting the first fin to the ground plane and one or more additional second traces electrically connecting the second fin to the ground plane.

Abstract: A balanced, antipodal tapered slot antenna includes one or more antenna elements or unit cells having metallic cross walls that are located in spaces between the adjacent elements of the antenna. The elements can include vias interconnecting metallic conductors of the elements and one or more magnetic slots in the metallic conductors. A plurality of the antenna elements or unit cells can be arranged in an antenna array that has a mirrored configuration with adjacent intermediate neighboring elements of the antenna array mirrored one-dimensionally with elements reversed along the E-plane, or doubly-mirrored, two-dimensionally, in the E-plane and the H-plane by reversing the orientation of alternate elements. Metallic cross walls and metallic rods are disposed in a non-electrically contacting relationship with adjacent antenna elements. The substrate of the antenna includes dielectric material located at the aperture of the antenna element.

Abstract: A modular wideband antenna element for connection to a feed network. There is a ground plane, and first and second flared fins above the ground plane. The fins each define a connection location that is relatively close to the ground plane and tapering to a free end located farther from the ground plane. The connection location of the first fin is electrically coupled to the feed network and the connection location of the second fin is electrically coupled to the ground plane. There are one or more additional first traces electrically connecting the first fin to the ground plane and one or more additional second traces electrically connecting the second fin to the ground plane.

Abstract: A balanced, antipodal tapered slot antenna includes one or more antenna elements or unit cells having metallic cross walls that are located in spaces between the adjacent elements of the antenna. The elements can include vias interconnecting metallic conductors of the elements and one or more magnetic slots in the metallic conductors. A plurality of the antenna elements or unit cells can be arranged in an antenna array that has a mirrored configuration with adjacent intermediate neighboring elements of the antenna array mirrored one-dimensionally with elements reversed along the E-plane, or doubly-mirrored, two-dimensionally, in the E-plane and the H-plane by reversing the orientation of alternate elements. Metallic cross walls and metallic rods are disposed in a non-electrically contacting relationship with adjacent antenna elements. The substrate of the antenna includes dielectric material located at the aperture of the antenna element.

Abstract: This invention comprises sn inexpensive, flush-mounted microstrip antenna e polarization of which is easily changed from vertical linear to horizontal linear, left-circular, right-circular or any desired elliptical sense. This enables the designer to select the polarization by selecting the proper location of shorting posts in the antenna. The use of rf switching diodes in place of conventional shorting posts provides a means of electronically switching the polarization.

Abstract: An inexpensive, flush mounted selectable mode microstrip antenna which is equency-agile and has polarization diversity. The mode, frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the mode, frequency and polarization characteristics of the antenna. The selectable mode microstrip antenna arrays are also provided. The selection of mode, frequency and polarization can be selected and controlled by digital means such as a computer.

Abstract: An inexpensive, flush mounted microstrip antenna which is frequency agile d has polarization diversity. The frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the frequency and polarization characteristics of the antenna. Frequency-agility provides frequency scannable microstrip antenna arrays which also have polarization diversity. Frequency-agility, polarization diversity and frequency scannable arrays are controllable by digital means such as a computer.

Abstract: A single input multifrequency antenna is disclosed which comprises a plurty of radiating elements connected in series. The device may comprise multiple conformal edge slot radiators.

Abstract: An electrically small, microstrip radiator designed for small-diameter mile applications. The preferred embodiment comprises a cylindrical tube of epoxy fiberglass dielectric having a spiral conducting strip formed thereon. The tubular construction permits the antenna to be conformally mounted to the surface of the missile. RF input coupling may be achieved by an inductive post, and high radiation efficiency is obtained by strongly coupling RF currents to the body of the missile and exciting the dipolar mode of radiation. The design includes means for mechanically tuning the antenna over a narrow frequency range. The resultant spiral-slot antenna produces an axially polarized radiation field and a dipole radiation pattern with isotropic gain in a low cost and rugged construction.

Abstract: A dual radiating system where one radiating element is placed atop the ot in a piggyback fashion. The elements can be a pair of microstrip or dielectric-loaded parallel plate radiators, or it can be a combination of the two. Separate coaxial lines feed each of the radiators, and there is a minimum of coupling from one antenna to another. The antenna can be used alone or more effectively in a linear or planar conformal array.