Loading patent…
AssigneeSharp Kabushiki Kaisha
InventorMakio Nakamura
Estimating the term…
A reception frequency band is selected at 11.7 GHz-12.2 GHz, the local oscillating frequencies of local oscillators are determined at 10.75 GHz and 13.85 GHz, respectively, and each intermediate frequency band is selected at 950 MHz-1450 MHz and 1650 MHz-2150 MHz, respectively, so that the harmonic component of the frequency difference between local oscillation signals output from each local oscillator is not present in the frequency band of each intermediate frequency signal output from each mixer and in the reception band of polarization signals applied to input terminals.
A low noise converter receiving first and second polarization signals present in a first frequency band, converting said received first and second polarization signals into first and second intermediate frequency signals, respectively, and outputting said first and second intermediate frequency signals, comprising:
A receiver apparatus comprising a low noise converter receiving first and second polarization signals present in a first frequency band, converting said received first and second polarization signals into first and second intermediate frequency signals, respectively, and outputting said first and second intermediate frequency signals, wherein said low noise converter includes:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95: specially adapted for satellite broadcast receiving
Coupling devices having more than two ports: conjugate devices, i.e. devices having at least one port decoupled from one other port
Resonators of the waveguide type: dielectric resonators
The frequency-determining element being a dielectric resonator: the active element in the amplifier being a semiconductor device
Term end not estimated
1. Field of the Invention
The present invention relates to low noise converters, particularly a low noise converter employed as an LNB (Low Noise Block down-converter) incorporated in a receiver of an antenna for satellite signal transmission/reception, converting two input signals differing in polarization into signals of different intermediate frequencies (IF) for transmission to an indoor unit (indoor receiver), and a receiver apparatus including such a low noise converter.
2. Description of the Background Art
FIG. 1 is a schematic block diagram showing an entire structure of a satellite broadcast reception system in which an LNB of the present invention is employed.
FIG. 2 is a block diagram of an LNB according to an embodiment of the present invention.
FIG. 3 shows a Y type distribution circuit of FIG. 2.
Embodiments of the present invention will be described in detail hereinafter with reference to the drawings. In the drawings, the same or corresponding components have the same reference characters allotted, and description thereof will not be repeated.
FIG. 1 is a schematic block diagram of an entire structure of a satellite broadcast reception system in which an LNB of the present invention is employed. Referring to FIG. 1, an antenna 101 is attached with a feed horn and a cross polarization separator 110 at a succeeding stage. An LNB 102 is a portion of an element called “outdoor” of the present system, and is attached at a succeeding stage of cross polarization separator 110. LNB 102 amplifies a weak wave from a satellite with low noise to supply a signal of low noise and sufficient level to a connected indoor receiver 104 via a coaxial cable 103.
Indoor receiver 104 includes a DBS tuner 105, an FM demodulator 106, a video and audio circuit 107, and an RF modulator 108. A signal applied from coaxial cable 103 is processed by these circuits to be provided to a television set 109.