摘要：Die.e.tric re.onators are.ke. compone.ts in many microwave.and millime.re.wave.circuits and applications, including high-Q filte.s and fre.ue.cy-de.e.mining e.e.e.ts for pre.ision fre.ue.cy synthe.is. Multilaye.e. and bulk low-loss single.crystal and polycrystalline.die.e.tric structure. have.be.ome.ve.y important for de.igning the.e.de.ice.. Prope. de.ign re.uire. care.ul e.e.tromagne.ic characte.isation of low-loss mate.ial prope.tie.. This include. e.act simulation with pre.ision nume.ical software.and pre.ise.me.sure.e.ts of re.onant mode.. For e.ample. we.have.de.e.ope. the.Whispe.ing Galle.y mode.te.hnique. which has now be.ome.the.standard for characte.izing low-loss structure.. This pape. will re.ie. some.of the.common characte.isation te.hnique. use. in the.microwave.to millime.re.wave.fre.ue.cy re.ime.