Dual-band directional/omnidirectional antenna
First Claim
1. A antenna system comprising:
- a dual-band driven antenna element for operation at an upper frequency and a lower frequency; and
a second antenna element parasitically coupled with the dual-band driven antenna to cooperate at the upper frequency, wherein, in response to an applied electrical current having an upper and a lower frequency, the antenna system radiates in a directional pattern at the upper frequency and in an omnidirectional pattern at the lower frequency.
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Accused Products
Abstract
An antenna having a dual-band driven element and a second antenna element simultaneously produces a directional radiation pattern at an upper frequency and an omnidirectional radiation pattern at a lower frequency. The dual-band driven element is formed as a dipole or monopole with at least one choke connected to the end of the dipole or monopole. In an exemplary embodiment, the dual-band driven element includes a central dipole or monopole that has chokes formed as u-shaped extensions located at the ends of the central antenna dipole or monopole. An antenna array includes the dual-band driven element and a second driven antenna element with a reflector and/or a director in a Yagi-Uda configuration. An antenna array includes the dual-band driven element with a reflector or with a reflector and a director in a Yagi-Uda configuration.
169 Citations
33 Claims
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1. A antenna system comprising:
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a dual-band driven antenna element for operation at an upper frequency and a lower frequency; and
a second antenna element parasitically coupled with the dual-band driven antenna to cooperate at the upper frequency, wherein, in response to an applied electrical current having an upper and a lower frequency, the antenna system radiates in a directional pattern at the upper frequency and in an omnidirectional pattern at the lower frequency. - View Dependent Claims (2, 3, 6, 7, 11, 12, 13, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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4. A antenna system comprising:
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a dual-band driven antenna element for operation at an upper frequency and a lower frequency; and
a second antenna element, wherein, in response to an applied electrical current having an upper and a lower frequency, the antenna system radiates in a directional pattern at the upper frequency and in an omnidirectional pattern at the lower frequency, wherein the dual-band driven antenna element comprises;
a center dipole that radiates at the upper frequency in response to an applied current at an upper frequency; and
at least one choke electrically connected to the center dipole, wherein the center dipole and the choke radiate at a lower frequency in response to an applied current at a lower frequency. - View Dependent Claims (5, 8, 9, 10)
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14. A antenna system comprising:
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a dual-band driven antenna element for operation at an upper frequency and a lower frequency; and
a second antenna element, wherein, in response to an applied electrical current having an upper and a lower frequency, the antenna system radiates in a directional pattern at the upper frequency and in an omnidirectional pattern at the lower frequency, wherein the second antenna element comprises at least one director, configured to direct radiation at the upper frequency. - View Dependent Claims (15)
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33. A antenna system comprising:
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a dipole dual-band driven antenna element having a center dipole that radiates at an upper frequency in response to an applied current at the upper frequency and at least one choke electrically connected to the center dipole, wherein the center dipole and the choke radiate at a lower frequency in response to an applied current at the lower frequency;
second dipole driven element operational at the upper frequency and electrically coupled to the dual-band driven antenna element; and
a transmission line and a balun electrically coupled to the second dipole driven element and the dipole dual-band driven antenna element, wherein, in response to an applied electrical current having an upper and a lower frequency, the antenna system radiates in a directional pattern at the upper frequency and in an omnidirectional pattern at the lower frequency.
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Specification