ECS, Inc.
(crystal, SAW, ceramic osc., filters, resonators) - http://www.ecsxtal.com
EPCOS (SAW filters, ceramic resonators) - http://www.epcos.com
K&L
Microwave.(RF filters) - http://www.klmicrowave.com
KOA Speer
Electronics (resistors, capacitors, inductors) - http://www.koaspeer.com
Micro Lamda Wireless, Inc. (YIG components) - http://microlambdawireless.com/
Microwave
Filter Company, Inc. - http://www.microwavefilter.com
Mini-Circuits
(RF amplifiers, mixers, power spitters...) - http://www.minicircuits.com
Pasternack
Enterprises (RF/microwave cables, adapters, etc.) - http://www.pasternack.com
RF
Monolithics (SAW resonators, filters, and oscillators) - http://www.rfm.com
Synergy Microwave Corporation - http://www.synergymwave.com
TTE, Inc.
(RF filters) - http://www.tte.com
Vectron
(Xtal Osc., SAW filters) - http://www.vectron.com
Z-Comm
(VCO's) - http://www.zcomm.com
notor.com - links to wireless components