Unidirectional antenna comprising a dipole and a loop
First Claim
1. A unidirectional antenna for at least one of transmitting and receiving radio frequency waves, the unidirectional antenna comprising a dipole antenna element and a loop antenna element coupled by a metallic transition element, wherein the loop antenna element is arranged to have a total length of substantially one wavelength of the radio frequency waves, thereby forming an integrated antenna arranged to generate a common radiation pattern having a dominant propagation wave front along one axis, wherein the metallic transition element is arranged to join a first portion of the dipole antenna element and a second portion of the dipole antenna element to define a first and second junction adjacent to a center top portion of the loop antenna element with a width of the metallic transition element being less than the width of the loop antenna element, and wherein the dipole antenna element, loop antenna element and metallic transition element are formed on a substrate.
1 Assignment
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Accused Products
Abstract
A unidirectional wireless antenna with a front-to-back ratio of 20 dB comprises a loop antenna and a dipole antenna interconnected by a metallic element and printed on a printed circuit board. The antenna is small in size but provides good unidirectional transmission.
14 Citations
13 Claims
- 1. A unidirectional antenna for at least one of transmitting and receiving radio frequency waves, the unidirectional antenna comprising a dipole antenna element and a loop antenna element coupled by a metallic transition element, wherein the loop antenna element is arranged to have a total length of substantially one wavelength of the radio frequency waves, thereby forming an integrated antenna arranged to generate a common radiation pattern having a dominant propagation wave front along one axis, wherein the metallic transition element is arranged to join a first portion of the dipole antenna element and a second portion of the dipole antenna element to define a first and second junction adjacent to a center top portion of the loop antenna element with a width of the metallic transition element being less than the width of the loop antenna element, and wherein the dipole antenna element, loop antenna element and metallic transition element are formed on a substrate.
- 12. A unidirectional antenna for at least one of transmitting and receiving radio frequency waves, the unidirectional antenna comprising a dipole antenna element and a loop antenna element connected by a metallic transition element, wherein the loop antenna element is arranged to have a total length of substantially one wavelength of the radio frequency waves, thereby forming an integrated antenna arranged to generate a common radiation pattern having a dominant propagation wave front along one axis, wherein the metallic transition element is arranged to join a first portion of the dipole antenna element and a second portion of the dipole antenna element to define a first and second junction adjacent to a center top portion of the loop antenna element with a width of the metallic transition element being less than the width of the loop antenna element, and wherein the dipole antenna element, loop antenna element and metallic transition element are formed on a substrate.
Specification