US Government As Represented by the Secretary of the Army

Daniel H Schaubert

Frederick G Farrar

Howard S Jones, Jr

Arthur R Sindoris

Scott T Hayes

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.

Microstrip antenna with polarization diversity

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.

Selectable-mode microstrip antenna and selectable-mode microstrip

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.

Frequency-agile, polarization diverse microstrip antennas and frequency

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.

Multifrequency series-fed edge slot antenna

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.

Conformal spiral antenna

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.

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Silver Spring, MD, United States of America

Daniel H Schaubert