Method and apparatus for a dual frequency band antenna
First Claim
1. A method of exciting an antenna element comprising the steps of:
- feeding a first channel of said antenna element with a first signal to establish a first current in a first direction such that said first signal has a first polarization when transmitted;
feeding a second channel of said antenna element with a second signal to establish a second current in a second direction such that said second signal has a second polarization when transmitted; and
isolating said first channel from said second channel to enable said first and said second signals to be simultaneously transmitted, or simultaneously received, or one of said signals being transmitted while the other signal is being received within one antenna element without appreciable coupling between said first channel and said second channel.
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Accused Products
Abstract
An apparatus and method for exciting an antenna with dual frequency bands which comprises feeding a first channel of the antenna with a first signal in the VHF band such that a first current is established in a first direction resulting in a first polarization, feeding a second channel of the antenna with a second signal such that a second current is established in a second direction resulting in a second polarization, and isolating characteristics of the first channel from characteristics of the second channel and the characteristics of the second channel from the characteristics of the first channel such that both the first channel and the second channel are adapted to transmit and receive energy within the same antenna structure without appreciable coupling between the first channel and the second channel.
14 Citations
12 Claims
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1. A method of exciting an antenna element comprising the steps of:
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feeding a first channel of said antenna element with a first signal to establish a first current in a first direction such that said first signal has a first polarization when transmitted; feeding a second channel of said antenna element with a second signal to establish a second current in a second direction such that said second signal has a second polarization when transmitted; and isolating said first channel from said second channel to enable said first and said second signals to be simultaneously transmitted, or simultaneously received, or one of said signals being transmitted while the other signal is being received within one antenna element without appreciable coupling between said first channel and said second channel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An antenna element comprising:
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a first feed feeding a first signal to a first channel to establish a first current in a first direction such that said first signal has a first polarization when transmitted; and a second feed feeding a second signal to a second channel to establish a second current in a second direction such that said second signal has a second polarization when transmitted, said first channel and said second channel being isolated to enable said first and second signals to be simultaneously transmitted, or simultaneously received, or one of said signals being transmitted while the other is being received within one antenna element without appreciable coupling between said first channel and said second channel. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification