1. M.S. sharavi, printed mimo antenna engineering, artech house, norwood, ma, 2014.
2. L. song and J. shen, evolved cellular network planning and optimization for umts and lte. london, crc press, 2011.
3. S. Uda, “wireless beam of short electric waves,” j. inst. elect. eng. japan, pp. 273–282, 1926.
4. Beam transmission of ultra short waves
5. Y. Qian, W. R. Deal, et al, “a uniplanar quasi-yagi antenna with wide bandwidth and low mutual coupling characteristics,” ieee antennas and propagation society int. symp. (apsursi), orlando, florida, vol. 2, pp. 924–927, 1999.