Some of the RF & Microwave web site i found

www.miteq.com
www.Microlab.FXR.com
www.minicircuits.com
www.maurymw.com
www.klmicrowave.com
www.kevlin.com
www.cheltonmicrowave.com
www.aeroflex.com
www.tensolite.com
www.rflabs.com
www.mw-elisra.com
www.channelmicrowave.com
www.noisecom.com
www.rfmd.com
www.rlcelecronics.com
www.voltronicscorp.com
www.endwave.com
www.sophiawireless.com
www.cst.com
cst microwave studio
www.ciaowireless.com
www.ansoft.com
nexxim software
www.herotek.com
www.psemi.com
www.berryind.com
www.rogerscorporation.com
www.herley.com
www.Mini-Systeminc.com
www.skyworksinc.com
www.winfoundry.com
www.amlj.com
www.astrolab.com
www.atceramics.com
www.lorch.com
www.synergymwave.com
www.filcs.com
www.rohde-schwarz.com
www.hittite.com
www.sirenza.com
www.nardamicrowave.com
www.spectrum-et.com
www.zcomm.com
www.dilabs.com
www.rtxtech.com
www.vectron.com
www.reactel.com
www.zeland.com
ie3d version
www.eagleware.com
eda
www.sonnetsoftware.com
www.micrometrics.com
www.hubersuhner.com