Patent ID: 9722324
Date: 2017-08-01
CPC Classifications: H01Q

Claim:
1. A communication device comprising: a first antenna and a second antenna, having corresponding first antenna port and second antenna port respectively, the antenna ports operably coupled to respective first input/output (I/O) port and second I/O port; a coupling compensation circuit comprised of independently configurable sections, the coupling compensation circuit coupled between the antenna ports and the I/O ports, wherein the sections are configured before operation to comprise: first, second, third, fourth, fifth and sixth sections, each said section having a first end and a second end, the respective first ends of the first section and the second section coupled to the respective first antenna port and second antenna port; the second end of the first section coupled to the first end of the fifth section and the first end of the third section; the second end of the second section coupled to the second end of the fifth section and the second end of the sixth section and the second end of the second section further coupled to the first end of the fourth section; the second end of the sixth section being terminated to ground; the respective second ends of the third and fourth sections being coupled to the respective first I/O port and second I/O port; the first section and the second section each being configured to control a mutual coupling level and envelope correlation between the antenna ports; the fifth and the sixth sections configured to optimize the mutual coupling of said configured first section and configured second section; and the third section and the fourth section each being configured to provide an impedance match between the optimized fifth and sixth sections and the I/O ports, wherein adjustment of the sixth section provides an extra degree of freedom in controlling coupling currents in the antenna ports.