Abstract: A radio frequency transceiver is disclosed herein that comprises a transmitter, a receiver, and an in-phase and quadrature imbalance calibration module. The receiver comprises a full complex mixer capable of operating as a frequency down-converter, and the in-phase and quadrature imbalance calibration module is arranged to merely calibrate the transmitter.

Abstract: An active electronically steerable receive antenna may comprise an antenna array that includes multiple receive antenna elements. Reflected radar signals may be received at the receive antenna elements, and received signals may be obtained from the receive antenna elements. The received signals may be processed via at least frequency down-conversion, analog-to-digital conversion, generation of digital signals, and alignment of the received signals or the digital signals for a predetermined angle of incidence. Multiple signals including a sum beamforming signal and a product beamforming may be multiplied to determine a beamformed signal. The sum beamforming signal and the product beamforming signal may be respectively determined by summing or multiplying at least two of the digital signals. The product beamforming signal may be a grating lobe suppression signal that suppresses grating lobes of the sum beamforming signal when multiplied with the sum beamforming signal.

Abstract: This invention relates to a method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements. The method includes generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna (112); reflecting the measurement signal by means of a reflector (118), thereby providing a desired reflected measurement signal; receiving the desired reflected measurement signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal. The reflection of the measurement signal involves asymmetrically modulating the measurement signal at the reflector. The determination of at least one of a distance and a relative velocity includes detecting the desired reflected measurement signal among several received reflections of the measurement signal, by means of information added by the asymmetric modulation.

Abstract: This invention relates to a method for determining at least one of a distance and a relative velocity by means of continuous wave radar measurements. The method includes generating a measurement signal in the form of a continuous wave radar signal; transmitting the measurement signal by means of an antenna (112); reflecting the measurement signal by means of a reflector (118), thereby providing a desired reflected measurement signal; receiving the desired reflected measurement 112 signal; and determining at least one of a distance and a relative velocity between the antenna and the reflector by means of the desired reflected measurement signal. The reflection of the measurement signal involves asymmetrically modulating the measurement signal at the reflector. The determination of at least one of a distance and a relative velocity includes detecting the desired reflected measurement signal among several received reflections of the measurement signal, by means of information added by the asymmetric modulation.

Abstract: A YIG oscillator including a magnetic structure; an oscillator circuit board attached to the magnetic structure and carrying a YIG resonator positioned in an air gap of the magnetic structure; an interface circuit board including terminals for external connections, the interface circuit board supporting the magnetic structure by means of a resilient component attached to the interface circuit board; and a flexible circuit connected at one end to the oscillator circuit board and connected at the other end to the interface circuit board.

Abstract: A microwave circuit having a two-sided substrate on which a microwave lead-through is arranged in the form of a symmetrical lead-through structure, being provided by opposite metallizationless areas on the upperside and the underside of the substrate and comprising a lead-through conductor, coplanar width adaption segments and first and second line segments connected thereto, the ground of said segments comprising opposite metallization parts being inter-connected through via holes. In a sealed microwave circuit a seal lead-through comprises said lead-through structure and a microstrip line segment.

Abstract: A YIG component for providing a microwave frequency output signal has a cavity holding an electromagnetic circuit defining an air gap between a pair of pole pins. The cavity having a tuning coil for generating a homogeneous magnetic field in the air gap, and further holding a YIG unit comprising a carrier; at least one ferrite crystal arranged in the air gap; and an interface connected to the ferrite crystal or crystals for providing the microwave frequency output signal. A magnetic core is included in the electromagnetic circuit and comprises the pole pins combined with magnetic flux closing path elements shaped as bars, the pole pins and the bar-shaped elements forming an open structure. The YIG component includes a support housing made of a nonmagnetic material having formed therein the above-mentioned cavity and having inside the cavity integral precision-tooled surfaces for the carrying and relative positioning of the electromagnetic circuit and the YIG unit.

Abstract: The invention is directed to the structure of a YIG-component. The component comprises a magnetic circuit for generating an homogeneous magnetic field in an air gap of the magnetic circuit and at least one ferrite crystal (81) arranged in the air gap. The magnetic resonance frequency of the ferrite crystal (81) may be controlled dependent on the strength of the homogeneous magnetic field. The magnetic circuit is enclosed in a cavity of a housing (53, 55) arranged for mechanically relieving the magnetic circuit from external influence. The housing (53, 55) may be formed from a material selected at will. The magnetic circuit is arranged in a specifically shaped seat for accurate positioning of the air gap in the housing (53, 55). A foundation formed in the housing (53, 55) is provided for supporting a YIG-unit (75) comprising the ferrite crystal (81) with correct positioning of the ferrite crystal in the air gap.