1. A method for molding a uniform part with non-uniform physical properties, the method comprising:
selecting a first material;
selecting a second material, wherein the second material has at least one different physical property than the first material;
simultaneously injecting the first and second materials into a mold; and
controlling flow fronts of the first and second materials in the mold.
2. The method of claim 1, further comprising:
producing a uniform molded part with a first region having a first physical property and a second region having a second physical property different from the first physical property.
3. The method of claim 1, wherein the first material is injected through a first gate and the second material is injected through a second gate.
4. The method of claim 1, wherein the first and second materials are plastic resins.
5. The method of claim 4, wherein the first material includes a glass filler.
6. The method of claim 1, wherein the flow fronts determine positions of the physical properties on the part
7. The method of claim 1, the controlling flow fronts comprising:
controlling positions of the first gate and the second gate on the mold;
controlling injection pressure of the first and second materials; and
controlling temperatures of the first and second materials.
8. The method of claim 2, wherein the first region has a different stiffness from the second region.
9. The method of claim 2, wherein the first region has a different hardness from the second region.
10. The method of claim 2, wherein the first region has a different flexural strength from the second region.
11. An apparatus for injection molding a part with non-uniform material properties, the apparatus comprising:
a first hopper configured to hold a first material;
a second hopper configured to hold a second material;
a mold including a first gate and a second gate;
a first barrel, coupled to the first hopper and coupled to the first gate, the first barrel disposed between the first hopper and the first gate, the first barrel melting the first material;
a second barrel, coupled to the second hopper and coupled to the second gate, the second barrel disposed between the second hopper and the second gate, the second barrel melting the second material; and,
an injector controller coupled to the first and the second barrels, configured to coordinate the injection of the melted first and the second materials simultaneously into the mold.
12. The apparatus of claim 11, wherein the first material has a different physical property than the second material.
13. The apparatus of claim 11, wherein the first and second materials are plastic resins and the first material includes a glass filler.
14. The apparatus of claim 11, wherein the molded part produced by the mold has a first region and a second region.
15. The apparatus of claim 14, wherein the first region has at least one physical property different from the second region.
16. An apparatus for injection molding a part with non-uniform material properties, the apparatus comprising:
means for holding a first material;
means for holding a second material;
means for melting the first and second materials;
means for simultaneously injecting the first and second melted materials; and
means for receiving the injected first and second materials;
17. The apparatus of claim 16 wherein the simultaneously injecting the first and second melted materials comprises:
means for controlling the injection of the first material through a first gate; and
means for controlling the injection of the second material through a second gate.
18. The apparatus of claim 16, further comprising:
means for controlling a flow front of the first melted material; and
means for controlling a flow front of the second melted material.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrical probe, comprising:
a coaxial cable having an inner conductor and an outer conductor, an extension portion of the inner conductor extending beyond the outer conductor at a probe end of the cable; and
a conductive whisker including:
a first portion separated from and extending a distance along the extension portion such that the first portion and the extension portion form a first capacitor; and
a second portion having a probe tip for receiving an input test signal from a circuit node under test.
2. The probe of claim 1, wherein the first portion of the conductive whisker is separated from the extension portion by a first dielectric material.
3. The probe of claim 2, wherein the first dielectric material is different than a second dielectric material between the inner conductor and the outer conductor of the coaxial cable.
4. The probe of claim 1, wherein the first capacitor formed by the first portion and the extension portion has an associated capacitance of less than about 15 fF.
5. The probe of claim 1, wherein an input end of the coaxial cable is terminated at a measurement device by a resistor.
6. The probe of claim 5, wherein the first capacitor is coupled in series to the resistor, the resistor having a resistance of not more than about 50 ohms.
7. The probe of claim 1, wherein the first capacitor is in series with a second capacitor formed of the outer conductor and the inner conductor of the coaxial cable, the first and second capacitors forming a capacitive voltage division circuit that divides the input test signal and presents an output voltage sional at an output of the capacitive voltage division circuit.
8. The probe of claim 7, wherein the coaxial cable is terminated by an amplifier having an associated input resistance that is greater than a characteristic impedance associated with the second capacitor.
9. The probe of claim 8, wherein the output of the capacitive voltage division circuit is coupled to an input of the amplifier such that the output voltage signal is provided to the amplifier.
10. The probe of claim 9, wherein the output voltage signal is independent of the frequency of the input test signal.
11. An electrical probe, comprising:
a coaxial cable having an inner conductor and an outer conductor, the coaxial cable coupled to an input resistor at an input end, wherein an extension portion of the inner conductor extends beyond the outer conductor at a probe end of the cable; and
a conductive whisker including:
a first portion separated from and extending a distance along the extension portion such that the first portion and the extension portion produce a capacitive coupling effect in series with the input resistor; and
a second portion having a probe tip for receiving an input test signal from a circuit node under test.
12. The probe of claim 11, wherein the input end of the cable is adapted for connection to a measurement instrument that determines one or more characteristics of the received input test signal based on an output signal measured across the input resistor.
13. The probe of claim 11, wherein the resistance of the input resistor is not greater than about 50 ohms and a capacitance corresponding to the capacitive coupling effect is not greater than about 15 fF,
14. The probe of claim 11, wherein the first portion of the whisker and the extension portion of the inner conductor are encapsulated by a dielectric material.
15. The probe of claim 11, wherein the first portion of the whisker and the extension portion of the inner conductor form a transmission line transformer.
16. The probe of claim 11, wherein a diameter of the whisker is less than a diameter of the inner conductor.
17. An electrical probe, comprising:
a coaxial cable having an inner conductor and an outer conductor separated by a first dielectric material and providing a first capacitive relationship, wherein an extension portion of the inner conductor extends beyond the outer conductor at a probe end of the cable; and
a conductive whisker including:
a first portion separated from and extending a distance along the extension portion such that the first portion and the extension portion provide a second capacitive relationship in series with the first capacitive relationship such that the first and second capacitive relationships form a capacitive voltage divider; and
a second portion having a probe tip for receiving an input test voltage signal from a circuit node under test.
18. The probe of claim 17, wherein the capacitance corresponding to the first capacitive relationship is greater than the capacitance corresponding to the second capacitive relationship.
19. The probe of claim 18, wherein the input voltage test signal received from the circuit node under test is divided by the capacitive voltage divider such that a resulting output voltage exists across the first capacitive relationship.
20. The probe of claim 19, wherein the output voltage is independent of a frequency of the input test voltage signal.
21. The probe of claim 20, wherein the coaxial cable is terminated by an amplifier having an associated input resistance that is greater than a characteristic impedance associated with the cable.
22. The probe of claim 21, wherein an output of the capacitive voltage division circuit is coupled to an input of the amplifier and to the input resistance.
23. The probe of claim 17, wherein the input test voltage signal has a frequency of at least 5 GHz.
24. The probe of claim 17, wherein the probe is a passive probe.