Probing apparatus with impedance optimized interface
First Claim
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1. A probing apparatus comprising:
- (a) an interface board; and
(b) an interface board waveguide comprising a plurality of elongate conductive traces supported by said interface board including;
(i) a center trace having a first edge and a second edge defining a center trace width;
(ii) a first side trace spaced apart from said first edge of said center trace and having a first side trace width;
(iii) a second side trace spaced apart from said second edge of said center trace and having a second side trace width, said second side trace width differing from said center trace width; and
(c) a coaxial cable comprising;
(i) a center conductor arranged to conduct a first signal and conductively connected to said center trace of said interface board waveguide; and
(ii) a coaxial outer conductor conductively connecting said first side trace and said second side trace of said interface board waveguide to an electrical potential.
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Abstract
In a membrane probing apparatus, the impedance of the interface between coaxial cables connected to the test instrumentation and the membrane supported co-planar waveguide that conductively connects to the probe'"'"'s contacts is optimized by eliminating a ground plane in the interface board.
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Citations
13 Claims
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1. A probing apparatus comprising:
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(a) an interface board; and (b) an interface board waveguide comprising a plurality of elongate conductive traces supported by said interface board including; (i) a center trace having a first edge and a second edge defining a center trace width; (ii) a first side trace spaced apart from said first edge of said center trace and having a first side trace width; (iii) a second side trace spaced apart from said second edge of said center trace and having a second side trace width, said second side trace width differing from said center trace width; and (c) a coaxial cable comprising; (i) a center conductor arranged to conduct a first signal and conductively connected to said center trace of said interface board waveguide; and (ii) a coaxial outer conductor conductively connecting said first side trace and said second side trace of said interface board waveguide to an electrical potential. - View Dependent Claims (2, 3)
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4. A probing apparatus comprising:
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(a) an interface board; (b) an interface board waveguide comprising a plurality of elongate conductive traces supported by said interface board including; (i) a first center trace having a first edge and a second edge defining a first center trace width; (ii) a first side trace spaced apart from said first edge of said first center trace and having a first side trace width; and (iii) a second side trace spaced apart from said second edge of said first center trace and having a second side trace width, said second side trace width differing from said first center trace width; (iv) a second center trace having a first edge spaced apart from second side trace and a second edge; and (v) a third side trace spaced apart from said second edge of said second center trace; (c) a first coaxial cable comprising; (i) a center conductor arranged to conduct a first signal and conductively connected to said first center trace; and (ii) a coaxial outer conductor conductively connecting said first side trace and said second side trace to an electrical potential; and (d) a second coaxial cable comprising; (i) a center conductor arranged to conduct a second signal and conductively connected to said second center trace; and (ii) a coaxial outer conductor conductively interconnecting said second side trace and said third side trace. - View Dependent Claims (5)
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6. A probing apparatus comprising:
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(a) a first waveguide comprising a plurality of elongate conductive traces supported by an interface board, said first waveguide including; (i) a center trace having a first edge and a second edge defining a center trace width; (ii) a first side trace spaced apart from said first edge of said center trace and having a first side trace width; (iii) a second side trace spaced apart from said second edge of said center trace and having a second side trace width, said second side trace width differing from said center trace width; and (c) a second waveguide comprising a plurality of elongate conductive traces including; (i) a center trace including a surface portion arranged to overlap a surface portion of said center trace of said first waveguide ; (ii) a first side trace including a surface portion arranged to overlap a portion of a surface of said first side trace of said first waveguide ; and (iii) a second side trace including a surface portion arranged to overlap a portion of a surface of said second side trace of said first waveguide; and (d) a center trace interconnect structure conductively interconnecting said overlapping surface portions of said center trace of said first waveguide and said center trace of said second waveguide, said center trace interconnect structure comprising a plurality of pads projecting from said overlapping surface portion of one of said center trace of said first waveguide and said center trace of said second waveguide including; (i) a first pad located nearer a first edge than a second edge of said center trace from which first pad projects; (ii) a second pad located nearer said first edge than said second edge of said center trace from which said first pad projects and spaced longitudinally apart from said first pad; (iii) a third pad located nearer said second edge than said first edge of said center trace from which said first pad projects; and (iv) a fourth pad located nearer said second edge than said first edge of said center trace from which said first pad projects and spaced longitudinally apart from said third pad; (e) a first side trace interconnect structure conductively interconnecting said overlapping surface portion of said first side trace of said second waveguide and said surface of said first side trace of said first waveguide; and (f) a second side trace interconnect structure conductively interconnecting said overlapping surface portion of said second side trace of said second waveguide and said surface of said second side trace of said first waveguide. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification