PURPOSE: To increase the space for line wiring and to improve the freedom for wiring by using a parallel line type directional coupler and printing the line part on both sides of a single dielectric substrate.
CONSTITUTION: The electric wave given from an input terminal 10 is divided into two parts through a parallel line type directional coupler 18 and then distributed again into two directions by parallel line type directional couplers 16 and 17. Thus a 4-distribution device is obtained as a whole. These couplers 16∼ 18 of this antenna feeding circuit have their length (l) equal to 1/4 wavelength and therefore reduced occupied areas. This increases the space for line wiring, and furthermore the impedance matching can be easily obtained between a line and its bent area by forming stubs 22. In addition, a line crossover having an extremely small mutual coupling degree can be obtained between lines 20 and 21 by setting these two lines orthogonal to each other since the line parts are printed on both sides of a dielectric substrate 5 with insulation secured by a dielectric substance. Thus, the freedom for wiring is improved.
MANO SEIJI
NUMAZAKI TADASHI
