Antenna array with low Rx and Tx sidelobe levels
View Patent ↗The various technologies presented herein relate to mitigating or reducing sidelobe levels during operation of an antenna array. Power coefficients operating across an antenna array are tapered to facilitate a power concentration at central region of the antenna array while power coefficients of a lower magnitude are generated at the periphery of the antenna array. Power coefficient variation can be effected by at least one of electrical path length, number of antennas being powered in a particular antenna subarray, a number of T-splitters incorporated into an electrical path servicing an antenna, etc. Electrical coupling of a pre-T/R stripline and a post-T/R stripline can be achieved in conjunction with operation with a dielectric layer, wherein the dielectric layer acts as a dielectric at the K u frequency band. Further, phase delay can be applied to at least one electrical signal to facilitate concurrent delivery of power across the antenna array.
1. An antenna array, comprising:
a plurality of antenna subarrays, the plurality of antenna subarrays are located around a central point in the antenna array, wherein the plurality of antenna subarrays comprises:
a first antenna subarray comprising at least one antenna element;
a second antenna subarray comprising a first plurality of antenna elements; and
a third antenna subarray comprising a second plurality of antenna elements, wherein the second antenna subarray includes a greater number of antenna elements than the first antenna subarray, the third antenna subarray comprises a greater number of antenna elements than the second subarray, the first antenna subarray is located closer to the center point of the antenna array than the second antenna subarray, the second antenna subarray is located closer to the center point of the antenna array than the third antenna subarray, each antenna element in the first antenna subarray, the second antenna subarray, and the third antenna subarray has a power coefficient, wherein the sum of the antenna power coefficients of the at least one antenna element in the first antenna subarray is greater than the sum of the antenna power coefficients of the first plurality of antenna elements in the second antenna subarray, and further wherein the sum of the antenna power coefficients of the first plurality of antenna elements in the second antenna subarray is greater than the sum of the antenna power coefficients of the second plurality of antenna elements in the third antenna subarray.
2. The antenna array of claim 1 , wherein a first radiator element and a second radiator element in the second antenna subarray are connected via a common stripline-to-stripline interconnect, the first radiator element having a first power coefficient and the second radiator element having a second power coefficient that is different from the first power coefficient, wherein the stripline-to-stripline interconnect comprises a pre-transmit/receive (T/R) stripline layer, a post-T/R stripline layer, and a common ground layer, the pre-transmit/receive (T/R) stripline layer and the post-T/R stripline layer electrically couple via the ground layer, and the pre-T/R stripline layer is connected to an input port.
3. The antenna array of claim 2 , wherein the first power coefficient is a function of a first electrical path length between the first radiator element and the input port, and the second power coefficient is a function of a second electrical path length between the second radiator element and the input port.
4. The antenna array of claim 2 , wherein the first power coefficient is a function of a first number of T-splitter components located in a first electrical path between the first radiator element and the post-T/R stripline layer and the second power coefficient is a function of a second number of T-splitter components located in a second electrical path between the second radiator element and the post-T/R stripline layer.
5. The antenna array of claim 4 , wherein the T-splitter components are 50/50 junction splitters, electrical energy arriving at the T-splitter components is split equally between the first electrical path connecting the first radiator element and the second electrical path connecting the second radiator element.
6. The antenna array of claim 4 , wherein the electrical coupling between the post-T/R stripline layer and the pre-T/R stripline layer is facilitated by a dielectric material.
7. The antenna array of claim 6 , wherein the dielectric material comprises polytetrafluoroethylene.
8. The antenna array of claim 2 , wherein the power coefficient facilitates operation of the antenna array at a frequency of between 12 GHz and 18.2 GHz.
9. The antenna array of claim 2 , wherein the power coefficient facilitates operation of the antenna array with a sidelobe magnitude of −30 dB relative to the magnitude of a mainlobe generated during operation of the antenna array.
10. The antenna array of claim 2 , further comprising a dielectric layer that is configured to be polarized when energy at a frequency of about 12-18 GHz is applied thereto, wherein in the polarized state the dielectric layer facilitates electrical coupling of the pre-T/R stripline layer and the post-T/R stripline layer.