**From:** Hassan Ali (*[email protected]*)

**Date:** Fri Jun 23 2000 - 06:36:41 PDT

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I attended a presentation by a high-frequency (1GHz < f < 65GHz) coaxial

cable vendor, and the presenter claimed that their cables use a material

with a very low dielectric constant and therefore are ideal for high-speed

application as they give rise to low capacitive loading. He gave a formula

showing the capacitance (I think per unit length) decreasing as you decrease

dielectric constant. This claim, however, perplexed me as I don't know how a

cable's capacitance per unit length would give rise to a capacitive loading.

All I know from my transmission line classes, a lossless transmission line

with Z0 = sqrt(L/C) would transmit signals exactly the same way regardless

of the value of the p.u.l. capacitance C as long as the ratio L/C is

maintained. Am I missing something here?

Thanks.

Hassan.

-- Hassan Ali <[email protected]> Equipment & Network Interconnect, Nortel Networks 2 Brewer Hunt Way, Kanata ON, K2K 2B5 Canada Tel: 613-765-1410 (ESN 395) Fax: 613-765-5512 (ESN 395)**** To unsubscribe from si-list or si-list-digest: send e-mail to [email protected] In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****

**Next message:**Larry Miller: "RE: [SI-LIST] : Merits of low dielectric constant"**Previous message:**Alex March: "[SI-LIST] : Looking for a pulse or pattern generator"**Next in thread:**Larry Miller: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Zabinski, Patrick J.: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Dan Swanson: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Ingraham, Andrew: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Doug Brooks: "Re: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Doug Brooks: "Re: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Dorin Oprea: "Re: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Ingraham, Andrew: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Doug Brooks: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Ingraham, Andrew: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**[email protected]: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**Hans Mellberg: "RE: [SI-LIST] : Merits of low dielectric constant"**Maybe reply:**[email protected]: "RE: [SI-LIST] : Merits of low dielectric constant"

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