Triple Frequency U-Slot Microstrip Antenna.
Patent, Filed 11 Dec 86, patented 23 Aug 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A microstrip antenna employing a rectangular radiating element having a U-shaped slot oriented parallel to the length of the radiating element and employing a single feedline coplanar with the radiating element. The slotted radiating element has three resonances a length resonance polarized parallel to the length of the element a width resonance polarized parallel to the width element and a slot resonance polarized parallel to the length of the element. By proper selection of the length and location of the slot, the frequency of the slot resonance can be placed such that a region of circular polarization occurs between the width resonance and the slot resonance. Alternatively, a region of circular polarization can be created between the length resonance and the width resonance since they are also polarized perpendicular to each other. Thus the U-slotted antenna provides either triple-frequency operation or dual-frequency operation in which one frequency is circularly polarized and the other frequency is elliptically polarized. Patents. rh
- Electrical and Electronic Equipment