Complete outdoor radio unit for LMDS
First Claim
1. A complete outdoor radio unit for the Local Multipoint Distribution Service having a transceiver adapted for mounting to a housing at a rear side of a dish antenna, the transceiver comprising:
- a) a transmitter and a receiver operable to transmit and receive radio waves in the millimeter wavelength portion of the electromagnetic spectrum;
b) a heat sink having a planar inner surface with gold plated copper and an outer surface having fins, the heat sink forming a housing rear wall and being adapted for attachment to a housing at a rear side of a dish antenna in order to form an air tight and waterproof transceiver enclosure;
c) a power supply printed circuit board having a top surface with the power supply circuitry of said transceiver mounted thereon and a bottom surface defining a ground plane, the bottom surface being attached directly to said heat sink;
d) an L-band microwave printed circuit board having a top surface with microwave intermediate frequency circuitry mounted thereon and a bottom surface defining a ground plane, the bottom surface being attached directly to said heat sink;
e) a thermally and electrically conductive plate defining a millimeter ground plane, the millimeter ground plane being attached directly to said heat sink; and
f) a millimeter microwave printed circuit board having a top surface with microwave circuitry operable in the millimeter wavelength band mounted thereon and a bottom surface defining a ground plane, the bottom surface being directly attached to said millimeter ground plane, whereby said transceiver has a substantially planar configuration with all of said printed circuit boards connected to said heat sink by thermally conductive paths for effective heat transfer.
1 Assignment
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Accused Products
Abstract
The complete outdoor radio unit for LMDS is a light weight, compact transceiver featuring planar circuitry. The transceiver uses cross polarization through an orthomodal transducer and frequency offeset beteen transmit and receive to provide isolation between the transmitter and receiver. The transceiver includes three printed circuit boards directly attached by thermally conductive epoxy to a heat sink which forms part of the antenna dish/transceiver housing for effective heat transfer. One of the three circuit boards is a millimeter wave circuit board, which is attached to the heat sink by a millimeter ground plane. The millimeter ground plane has a plurality of cavities defined therein which form the lower portion of waveguide assemblies. Two of the waveguides are used as receiver and transmitter transmission lines into the orthomodal transducer, and two of the waveguides are used as bandpass filters. The waveguides interface with the millimeter wave board through microstrips. The millimeter wave board is connected to the other circuit boards by a flex cable using thin film conductive strips to accommodate both high frequency and DC voltages. The transceiver also includes a DC-DC converter in the power supply which is modified to connect the base plate to the heat sink for compactness and improved heat transfer, and a frequency synthesizer with a phase locked loop hardwired to a single reference frequency for compact size.
194 Citations
20 Claims
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1. A complete outdoor radio unit for the Local Multipoint Distribution Service having a transceiver adapted for mounting to a housing at a rear side of a dish antenna, the transceiver comprising:
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a) a transmitter and a receiver operable to transmit and receive radio waves in the millimeter wavelength portion of the electromagnetic spectrum;
b) a heat sink having a planar inner surface with gold plated copper and an outer surface having fins, the heat sink forming a housing rear wall and being adapted for attachment to a housing at a rear side of a dish antenna in order to form an air tight and waterproof transceiver enclosure;
c) a power supply printed circuit board having a top surface with the power supply circuitry of said transceiver mounted thereon and a bottom surface defining a ground plane, the bottom surface being attached directly to said heat sink;
d) an L-band microwave printed circuit board having a top surface with microwave intermediate frequency circuitry mounted thereon and a bottom surface defining a ground plane, the bottom surface being attached directly to said heat sink;
e) a thermally and electrically conductive plate defining a millimeter ground plane, the millimeter ground plane being attached directly to said heat sink; and
f) a millimeter microwave printed circuit board having a top surface with microwave circuitry operable in the millimeter wavelength band mounted thereon and a bottom surface defining a ground plane, the bottom surface being directly attached to said millimeter ground plane, whereby said transceiver has a substantially planar configuration with all of said printed circuit boards connected to said heat sink by thermally conductive paths for effective heat transfer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification