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Kista, Sweden

Ojefors E.,Sivers IMA AB | Heinemann B.,Ihp Microelectronics | Pfeiffer U.R.,University of Wuppertal
IEEE Transactions on Microwave Theory and Techniques

Monolithically integrated 220- and 320-GHz receiver front-ends manufactured in an engineering version of an f T/f max=280/435-GHz SiGe technology are presented. Subharmonic mixing is provided by a Gilbert cell with stacked switching quads fed by quadrature 110/160-GHz local oscillator (LO) signals. The 220-GHz version of the front-end is equipped with an integrated LNA with a measured 15-dB gain and 28-GHz bandwidth. This front-end yields a conversion gain of 16 dB, an 18-dB single-sideband (SSB) noise figure (NF), and a 30-GHz bandwidth when pumped with a 0-dBm 110-GHz LO signal. The 320-GHz version of the front-end omits the low-noise amplifier and features an integrated × 9 LO multiplier chain to facilitate operation and characterization. A conversion gain of -14 dB and a 36-dB SSB NF is obtained over the 313-to-328-GHz frequency range. The presented circuits demonstrate that a fully integrated receiver front-end can be implemented up to submillimeter-wave frequencies in an SiGe HBT technology. © 2012 IEEE. Source

Hallbjorner P.,SP Technical Research Institute of Sweden | He Z.,Chalmers University of Technology | He Z.,Sinowave AB | Bruce S.,Sivers IMA AB | Cheng S.,Ericsson AB
IEEE Antennas and Wireless Propagation Letters

A 77-GHz lens antenna for automotive radar applications is presented. It consists of a feeder in the form of a 2 × 2 patch array etched from a single layer on a 100-μm-thick substrate and a commercially available dielectric lens. Compared to previously published lens antennas, the presented design has the advantages of excellent electrical performance and a low profile in combination with a thin lens. Measurements of port impedance match and radiation patterns are presented. Beam tilt by lateral offset of the lens is demonstrated experimentally. © 2006 IEEE. Source

Chen J.,Ericsson AB | Chen J.,Chalmers University of Technology | He Z.,Chalmers University of Technology | Bao L.,Ericsson AB | And 6 more authors.
European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 7th European Microwave Integrated Circuits Conference, EuMIC 2012

A millimeter-wave radio test-bed is implemented which demonstrates 16QAM transmission over 70/80 GHz band for data rate up to 10 Gbps. Performance of the 16QAM transmitter and receiver is evaluated in a loop-back lab set-up. With the proposed 10 Gbps on single carrier system architecture, it is possible to achieve 40 Gbps over a 5 GHz bandwidth when combined with polarization and spatial multiplexing. © 2012 European Microwave Assoc. Source

Ojefors E.,Sivers IMA AB | Stoij C.,Sivers IMA AB | Heinemann B.,Im Technologiepark 25 | Rucker H.,Im Technologiepark 25
European Microwave Week 2014: "Connecting the Future", EuMW 2014 - Conference Proceedings; EuMIC 2014: 9th European Microwave Integrated Circuits Conference

An E-band power amplifier is demonstrated in an evaluation version of a fT/fmax 300-GHz/450-GHz SiGe:C BiCMOS technology. Eight-way power combining of the outputs of transformer-matched differential-cascode unit cells is used in the final stage of the amplifier. A breakout of the final stage yields a measured small-signal gain of 14 dB at 80 GHz with a 16-GHz bandwidth, whereas a version of the amplifier with an integrated 4-way power-combined pre-driver provides 28 dB gain. In the 71-76-GHz sub-band, a saturated output power of 22 dBm with an output 1-dB compression point of 20 dBm is measured, while 19 dBm output power and a 17-dBm compression point is obtained in the 81-86-GHz band. The current consumption at a 3.3-V supply voltage is 330 mA for the output stage and 500 mA for the amplifier with an integrated pre-driver. © 2014 European Microwave Association-EUMA. Source

Stoij C.,Sivers IMA AB
Microwave Journal

Information is provided about those antennas that have an appreciable size as compared to wavelength and where matching and radiation efficiency is a minor issue. Most of the energy supplied to the antenna from the transmitter is transformed to radiated energy in one direction or another. The isotropic radiator sends all its energy equally distributed in all directions, but any other physical reliable antenna will concentrate its energy in specific directions. Other radiation patterns can also be desirable, such as broadcast antennas radiating their energy in a doughnut shaped pattern with the antenna in the center. Another example is a radar antenna that has a narrow horizontal beam and a broad beam in azimuth. Antenna area and reciprocity. The effective area of an antenna is defined as the power delivered on the antenna's terminals divided by the power density that the receiving antenna is exposed to. Source

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