An analog type of microwave frequency divider for dividing frequency by two. It comprises a common emitter transistor (8) and a feedback loop comprising a filter (9, 11) and a phase-adjusting inductor (12). The filter (9, 11) is tuned to half the input frequency (fe/2) and the transistor (8) operates in its non-linear region. The two inductors (11, 12) are made of microstrip. The divider also includes an output matching filter comprising a capacitance (14) and two inductors (15, 16) which are likewise both made of microstrip.
A multilayer printed circuit board (100) includes a plurality of layers (101, 102, 104, 106, 108 and 110). Located within intermediate layer (106) is an inductor (200) which is shielded by top layer ground plane (202) and bottom layer ground plane (204). In another embodiment of the present invention, the inductor (200) can have its inductance adjusted by way of a inductance adjustment runner (316, 318) or by an electronic inductance adjustment device (408).
