Reconfigurable output power 4×4 Butler matrix

A reconfigurable output power 4×4 Butler matrix consisted of four adjustable output power ratio branch line couplers and two 45 degree phase shifters is proposed. The adjustable output power ratio branch line coupler is accomplished by simply changing the values of two shunted capacitors. The simulated antenna factors of four different inputs changes as predication are also presented.

[1]  Jan-Dong Tseng,et al.  An adjustable unequal power divider design , 2014, 2014 IEEE International Workshop on Electromagnetics (iWEM).

[2]  Jan-Dong Tseng,et al.  Mixed type branch line coupler designs , 2015, 2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC).

[3]  Sheng-Fuh Chang,et al.  A 25-GHz Compact Low-Power Phased-Array Receiver With Continuous Beam Steering in CMOS Technology , 2010, IEEE Journal of Solid-State Circuits.

[4]  R. Tayrani,et al.  Broad-band SiGe MMICs for phased-array radar applications , 2003 .

[5]  Chien-Chun Ku,et al.  An adjustable power ratio branch line design , 2015, 2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC).

[6]  Xiang Guan,et al.  A fully integrated 24-GHz eight-element phased-array receiver in silicon , 2004, IEEE Journal of Solid-State Circuits.