MULTI LEVELED ACTIVE ANTENNA CONFIGURATION FOR MULTIBAND MIMO LTE SYSTEM

摘要

An active antenna system and algorithm is described that provides for dynamic tuning and optimization of antenna system parameters for a MIMO system where correlation and isolation between antennas in the system are dynamically altered to provide for greater throughput. As one or multiple antennas are loaded or de-tuned due to environmental changes, corrections to correlation and/or isolation are made by selecting the optimal antenna radiation pattern and by adjusting electrical length and/or reactive loading of transmission lines connecting the antennas. Multiple Isolated Magnetic Dipole (IMD) antennas are co-located and connected with a feed network that can include switches that adjust phase length for transmission lines connecting the antennas. Filtering is integrated into the feed network to improve rejection of unwanted frequencies. Filtering can also be implemented on the antenna structure.

主权项

1. An antenna system, comprising:
a first active modal antenna adapted for operation at a plurality of first antenna modes, each of said first antenna modes having a distinct antenna radiation pattern; a second active modal antenna adapted for operation at a plurality of first second antenna modes, each of said second antenna modes having a distinct antenna radiation pattern; a processor coupled to the first and second modal antennas and configured to vary antenna modes thereof; at least one conductor coupling the first modal antenna with the second modal antenna in a multi-input multi-output (MIMO) configuration; and one or more active tuning blocks coupled to at least one of said first and second modal antennas, said active tuning blocks individually comprising one or more switches, filters, tunable components or passive components for altering a length of the conductor connecting the first and second modal antennas; and said processor further coupled to the one or more active tuning blocks and adapted to generate control signals for communicating therewith for configuring the active tuning blocks; and at least one of said first and second active modal antennas comprising:
a driven antenna element positioned above a circuit board forming an antenna volume therebetween,a first parasitic element positioned within the antenna volume and coupled to a first active element, the first parasitic element and first active element being configured to induce a shift in a frequency response of the driven antenna element, anda second parasitic element positioned outside of the antenna volume and adjacent to the driven element and coupled to a second active element, the second parasitic element and second active element being configured for steering the radiation pattern of the driven antenna element.