If the duplexing circuitry were implemented so as to include a separate transmit/receive duplexer within each transceiver, an RF switch would need to be provided for alternately connecting the separate duplexers to the antenna. Accordingly, the duplexing circuitry must provide adequate isolation not only between the different operating bands, but also between the transmit and receive channels of each band. This complexity arises from the additional filtering required to provide isolation between the separate transceivers dedicated toĬommunication over each frequency range.
#DOUBLE HELIX PORTABLE#
In the so-called "dual-band" portable phones currently being developed for operation over the cellular band (824 MHz to 892 MHz) and the proposed Personal Communication Network (PCN) band (1.8 GHz to 1.96 GHz), the antenna duplexing circuitry is required to be even more complex. cone, spiral, umbrella Particular materials used therewith for broadside radiating helical antennas H01Q1/362- Structural form of radiating elements, e.g.cone, spiral, umbrella Particular materials used therewith H01Q1/36- Structural form of radiating elements, e.g.H01Q1/00- Details of, or arrangements associated with, antennas.H01Q11/02- Non-resonant antennas, e.g.H01Q11/00- Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements.238000006011 modification reaction Methods 0.000 description 1.229910052802 copper Inorganic materials 0.000 description 1.RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1.239000003989 dielectric material Substances 0.000 description 2.230000005672 electromagnetic field Effects 0.000 description 5.238000005859 coupling reaction Methods 0.000 abstract description 8.238000010168 coupling process Methods 0.000 abstract description 8.230000001808 coupling Effects 0.000 abstract description 8.238000000926 separation method Methods 0.000 claims description 7.230000005540 biological transmission Effects 0.000 claims description 9.230000000875 corresponding Effects 0.000 claims abstract description 5.238000004804 winding Methods 0.000 claims abstract description 45.
239000004020 conductor Substances 0.000 claims abstract description 143.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US490,925 external-priority Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated Priority to DE69623415T priority Critical patent/DE69623415T2/en Priority to CA002199724A priority patent/CA2199724C/en Priority to EP96922487A priority patent/EP0776531B1/en Priority to AU63346/96A priority patent/AU701389B2/en Priority to DK96922487T priority patent/DK0776531T3/en Priority to AT96922487T priority patent/AT223622T/en Priority to MX9701580A priority patent/MX9701580A/en Publication of WO1997000542A1 publication Critical patent/WO1997000542A1/en Priority to FI970814A priority patent/FI970814A/en Priority to HK98113758A priority patent/HK1012780A1/en Links Wallace Original Assignee Qualcomm Incorporated Priority date (The priority date is an assumption and is not a legal conclusion. Google Patents WO1997000542A1 - Double helix antenna system WO1997000542A1 - Double helix antenna system
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