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1. (WO2000042721) RADIO FREQUENCY RECEIVER CIRCUIT
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2000/042721 International Application No.: PCT/GB2000/000044
Publication Date: 20.07.2000 International Filing Date: 11.01.2000
Chapter 2 Demand Filed: 10.08.2000
IPC:
H04B 10/26 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
10
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
24
Bidirectional transmission
26
using a single light source for both stations involved
Applicants:
FORSTER, Ian, James [GB/GB]; GB (UsOnly)
MARCONI CASWELL LIMITED [GB/GB]; One Bruton Street London WIX 8AQ, GB (AllExceptUS)
Inventors:
FORSTER, Ian, James; GB
Agent:
HOSTE, Colin, Francis; Marconi Intellectual Property Waterhouse Lane Chelmsford Essex CM1 2QX, GB
Priority Data:
9900901.116.01.1999GB
Title (EN) RADIO FREQUENCY RECEIVER CIRCUIT
(FR) CIRCUIT RECEPTEUR HAUTE FREQUENCE
Abstract:
(EN) A radio frequency (RF) receiver circuit (2) comprises: an antenna (8) for receiving a radio frequency (RF) signal (4); an optical detector (10) for receiving a modulated optical signal (12) and converting it to an electrical signal; means (14) for mixing the electrical and RF signals to produce an intermediate frequency signal; and a reflective optical modulator (16) which is operable at the intermediate frequency to modify and reflect (24) the modulated optical signal (12) with the intermediate frequency. By detecting the optical signal which has been modified by the circuit, it is possible to remotely detect the RF signal received by the circuit and the circuit thus acts as a remotely accessible RF receiver circuit.
(FR) L'invention porte sur un circuit récepteur (2) haute fréquence qui comprend: une antenne (8) destinée à recevoir un signal (4) haute fréquence (HF); un détecteur optique (10) destiné à recevoir un signal (12) optique modulé et à le convertir en un signal électrique; un organe (14) destiné à mélanger les signaux électriques et HF de façon à générer un signal de fréquence intermédiaire; et un modulateur (16) optique réfléchissant pouvant fonctionner à la fréquence intermédiaire de façon à modifier et renvoyer (24) le signal (12) optique modulé à l'aide de la fréquence intermédiaire. En détectant le signal optique modifié par le circuit, il est possible de détecter à distance le signal HF reçu par le circuit, le circuit fonctionnant ainsi comme circuit récepteur HF accessible à distance.
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Designated States: AE, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CR, CU, CZ, DE, DK, DM, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (EPO) (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)