Reconfigurable un‐equal division power divider with the compact size for high efficiency power amplifiers

In this letter, a reconfigurable un‐equal division two‐way power divider with the compact size is presented for high efficiency power amplifiers. It is based on the Wilkinson power divider of which the quarter‐wave long lines are replaced by coupled lines. Two ends of each coupled line are terminated with switches which provide the two modes of operation, or two‐way power divider and one‐way transmission line. These switches are used to adjust the characteristics of the coupled line in order to allow the good insertion and return loss performance in both modes. At the design frequency of 2.14 GHz, the fabricated 1:2 power divider showed the input return loss (S11) of −23.0 dB, isolation (S32) of −27.2 dB, and insertion loss of −5.05 dB (S21) and −2.25 dB (S31) in the power divider mode. The insertion loss (S21) was measured to be −0.90 dB with the return loss (S11) of −21.1 dB in the power transmission mode.