PURPOSE: To arrange the antenna and the microwave circuit on one dielectric substrate by forming the microwave circuit on the other plane of the dielectric substrate forming the radial conductor of the antenna.
CONSTITUTION: For the microwave circuit with integrated antenna, a mixer circuit is constituted by providing a radial conductor 3 of the microstrip antenna and a branch filter 10 of a microstrip line coupled to the conductor on one plane of the dielectric substrate and providing a coplanar circuit equipped with a coplanar line on the other plane, and the antenna and the mixer are integrated. When an integer is defined as (n) and one wavelength on the coplanar line constituting the mixer circuit is defined as λ, the line length of the said line is (λ/4)+(nλ/2), the above-mentioned coplanar line is used as a feeder line, and power is supplied from the coplanar line through a conductor, which is passed through the front and rear sides of the dielectric substrate, to the radial conductor.
SUEMATSU KENJI
IIDA AKIO
ITO KENJI
URASAKI SHUJI
