摘要:
A motion detection unit for detecting motion by means of Doppler frequency shift which comprises: a microwave circuit board (1) comprising an oscillator (14), a hybrid coupler circuit element (11) and a mixer (12); an antenna board (2) comprising at least one transmit and receive antenna (4, 5); and a ground plane layer, the two boards (1, 2) being superimposed with the ground plane layer intervening, wherein, in operation, the hybrid coupler circuit element (11) divides power from the oscillator (14), into power for the antenna transmission signal and local oscillator (LO) power to the mixer (12), and directs a received signal from the antenna (4, 5) to the mixer (12), the local oscillator (LO) power and the received signal being combined in the mixer (12) to produce a Doppler signal output.
摘要:
Mixer assemblies (100) including mixer cells (110, 110'), baluns (112), quadrature mixers and image reject mixers, etc. The mixer cell may contain CPW strip RF input and slot line strip LO input. LO signal return is provided through a flip-chip (160, 160') mounted to a mixer contact area (140, 140') and the CPW RF input is preferably coupled to the contact area (140, 140') through a distributed or flip-chip mounted capacitor (136, 136'). The use of two mixer cells (110, 110') in novel embodiments of quadrature and image reject mixers is disclosed. CPW to slot line power dividing baluns for use within and without such mixers are also disclosed.
摘要:
An electronic viewing aid according to the present invention comprises a small-scale, portable personal radar system adapted to be worn by a person, which radar system includes a miniaturised radar front end assembly (22) operating with millimetre wavelength electromagnetic radiation, an electrical power source, signal processing means and a sensory output means. In a preferred embodiment of the invention, the radar front end assembly (22) is constructed in the form of a pair of spectacles (76), in which both a transmit antenna (78) and a receive antenna (90) of the radar system are carried on respective lens elements (75) of the spectacles (76) and analogue portions of both a transmitter circuit and a receiver circuit are carried on respective side support frames of the spectacles (76); and the sensory output means is an audio output means including stereo headphones (98).
摘要:
A monolithic microwave integrated circuit (MMIC) semiconductor chip, for use with a hybrid coupler, in a frequency downconverter. The chip has a first input lead for receiving a first combined input signal from the coupler, a second input lead for receiving a second combined input signal from the coupler, and an output lead. Each input signal is a microwave signal combined with a further frequency signal, and one of the microwave and further frequency signals of the first combined signal is out of phase with one of the microwave and further frequency signals of the second combined signal. A single balanced mixer has a first single ended mixer for converting the first combined signal to a first intermediate frequency signal and a second single ended mixer for converting the second combined signal to a second intermediate frequency signal. An amplifier is coupled to the first and second mixers for forming an amplified unbalanced intermediate frequency (IF) signal at the output lead representative of the first and second intermediate frequency signals.
摘要:
A radar transmitter/receiver arrangement for use, for example, in automotive vehicle control in which R.F. energy from a frequency modulated oscillator is applied to an antenna for transmission and to one input of a mixer by way of a rat-race device, and RF energy reflected from a target and received at said antenna is applied to another input of the mixer by way of the said rat-race device.
摘要:
An antenna array is adapted to handle an increased power of high frequency signal. The antenna array includes a substrate (1), a plurality of unit wiring patterns, each being consisted of a superconductor film (4) wiring pattern formed on a common plane to a major plane of the substrate and a non-linear element formed within each of the unit wiring pattern, the non-linear element being connected to an antenna pattern for radiating and absorbing high frequency electromagnetic field at one end and to a signal transmission path pattern at the other end. Each of the unit wiring pattern is connected to a signal detection means through a plurality of signal transmission path patterns.
摘要:
2.1 It is an object of the present invention to downconvert SHF signals, especially in the 22 GHz band, by means which are already on the market and not too expensive. 2.2 According to the invention the SHF signals are double converted or a subharmonic mixer can be used. 2.3 The invention can preferably be used for 22 GHz DBS systems.