Waveguide-to-microstrip line coupling arrangement and a frequency converter having the coupling arrangement
First Claim
1. A waveguide-to-microstrip line coupling arrangement comprising:
- (a) a waveguide having one end which is short-circuited;
(b) a microstrip line having a ground plane, a dielectric substrate and a center strip conductor which are stacked in sequence, said center strip conductor having a semicircular end having a radius which corresponds to one half the width of said center strip conductor, said microstrip line being positioned on an outer surface of a wall of said waveguide such that said ground plane is in contact with said waveguide;
(c) a metallic post having cylindrical portions, said post having one end adjacent to and connected to said center strip conductor, said metallic post extending from a center of a circle defined by said center conductor, said circle having a half portion which corresponds to said semicircular end of said center conductor, to the inside of said waveguide via circular through-holes made in said dielectric substrate, said ground plane, and said wall of said waveguide,said circular through-holes being coaxial with said metallic post, and the diameter of said circular through-holes made in said ground plane being made smaller than that of said circular through-holes made in said wall of said waveguide said cylindrical portions of, said metallic post including a largediameter portion interposed between first and second smalldiameter portions; and
(d) an annular cylindrical dielectric member fitted in said circular through-hole of said wall of said waveguide such that said first small-diameter portion of said metallic post penetrates said annular cylindrical dielectric member and said annular cylindrical dielectric member is supported by one end surface of said large-diameter portion.
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Accused Products
Abstract
In a waveguide-to-microstrip line coupling arrangement, a microstrip line is placed on an outer surface of a wall of a waveguide which is coupled with the microstrip line via a metallic post connected at its one end to a center strip conductor of the microstrip line and is inserted inside the waveguide via through-holes made in a ground plane of the microstrip line and in the wall of the waveguide where the diameter of the through-hole made in the ground plane is made smaller than that of the through-hole made in the wall of the waveguide. The waveguide has a short-circuited end and the metallic post is placed close to the short-circuited end. The coupling arrangement may be used in a microwave frequency converter having an microwave integrated circuit including a local oscillator and a mixer, where the MIC is located on an outer surface of a longitudinal wall extending from a short-circuited end to an open end.
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Citations
13 Claims
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1. A waveguide-to-microstrip line coupling arrangement comprising:
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(a) a waveguide having one end which is short-circuited; (b) a microstrip line having a ground plane, a dielectric substrate and a center strip conductor which are stacked in sequence, said center strip conductor having a semicircular end having a radius which corresponds to one half the width of said center strip conductor, said microstrip line being positioned on an outer surface of a wall of said waveguide such that said ground plane is in contact with said waveguide; (c) a metallic post having cylindrical portions, said post having one end adjacent to and connected to said center strip conductor, said metallic post extending from a center of a circle defined by said center conductor, said circle having a half portion which corresponds to said semicircular end of said center conductor, to the inside of said waveguide via circular through-holes made in said dielectric substrate, said ground plane, and said wall of said waveguide, said circular through-holes being coaxial with said metallic post, and the diameter of said circular through-holes made in said ground plane being made smaller than that of said circular through-holes made in said wall of said waveguide said cylindrical portions of, said metallic post including a largediameter portion interposed between first and second smalldiameter portions; and (d) an annular cylindrical dielectric member fitted in said circular through-hole of said wall of said waveguide such that said first small-diameter portion of said metallic post penetrates said annular cylindrical dielectric member and said annular cylindrical dielectric member is supported by one end surface of said large-diameter portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A microwave frequency converter comprising:
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(a) a waveguide having a pass band covering an RF signal frequency and a cutoff band covering a local oscillator signal frequency which is lower than that of said RF signal frequency, one end of said waveguide being short-circuited; (b) a microwave integrated circuit attached to an outer surface of a wall of said waveguide, said microwave integrated circuit having a microstrip line including a ground plane, a dielectric substrate and a center strip conductor which are stacked in sequence, said center strip conductor having a semicircular end whose radius corresponds to one half the width of said center strip conductor, said microstrip line extending along said outer surface of said wall, extending from the short-circuited end of said waveguide such than said ground plane, is in contact with said waveguide; (c) a metallic post having cylindrical portions, said post having one end adjacent to and connected to said center strip conductor, said metallic post extending from a center of a circle defined by said center conductor, said circle having a half portion which corresponds to said semicircular end of said center conductor, to the inside of said waveguide via circular through-holes made in said dielectric substrate, said ground plane, and said wall of said waveguide, said circular through-holes being coaxial with said metallic post, and the diameter of said circular through-hole made in said ground plane being made smaller than that of said circular through-hole made in said wall of said waveguide, said cylindrical portions of said metallic post including a large-diameter portion interposed between first and second small-diameter portions; (d) an annular cylindrical dielectric member fitted in said circular through-hole of said wall of said waveguide such that said first small-diameter portion of said metallic post penetrates said annular cylindrical dielectric member and said annular cylindrical dielectric member is supported by one end surface of said large-diameter portion; and (e) a local oscillator and a mixer both formed within said microwave integrated circuit for converting said RF signal from said waveguide into an IF signal. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification