Multiplex communications – Wide area network – Packet switching
Patent
1982-02-16
1984-07-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370123, 333134, 333206, H04J 102, H04B 150
Patent
active
044620985
ABSTRACT:
A unique RF signal combining/sorting apparatus is disclosed that includes first and second filters each comprised of one or more bandstop/bandpass filters intercoupled by transmission lines. The bandstop/bandpass filters include a shunt inductor or capacitor and a dielectric block having an input electrode plated on its top surface and a hole located at predetermined distance from the input electrode. The dielectric material is preferably a ceramic comprised of BaO, TiO.sub.2 and ZrO.sub.2. The dielectric block is entirely plated with copper or silver except for a portion of the top surface surrounding the hole and electrode and is essentially a capacitively coupled, short-circuited coaxial transmission line. Each of the first and second filters is tuned to pass the frequencies of one signal and attenuate the frequencies of the signal passed by the other. The unique RF signal combining/sorting apparatus can be configured as a multi-signal combiner, multi-signal sorter, or multi-signal combiner/sorter. This feature of the unique RF signal combining/sorting apparatus renders it particularly well suited for use as an antenna duplexer for radio transmitters and receivers.
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D'Avello Robert F.
Sokola Raymond L.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Olms Douglas W.
Roney, III Edward M.
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