Smart Antenna using Switched Multibeam Array Ms
This paper describes the design and realization of a 44 Butler Matrix as a beam forming network along with 4 linear antenna arrays to obtain four steerable beams, operating at 2.4 GHz. The simulation results are obtained using HFSS software. Further the concept of multibeam switching is discussed with an idea of suspended feed in between two matrices.
The study of Butler matrix BFN for four beams antenna system
In this paper, four beam patterns with frequency range from 1.7 GHz/spl sim/2.2 GHz is generated by a 4/spl times/2 antenna array. The directions of these beam patterns are /spl plusmn/12/spl deg/ /spl plusmn/40/spl deg/. The antenna directivity changes from 18 dBi to 18.7 dBi for these beam patterns. And the antenna gain changes from 10 dBi to 12.3 dBi. The H-plane 3 dB beamwidth changes from 21 degrees to 24.4 degrees. The test results are quite in agreement with that of simulation.
Fully Integrated Bidirectional CMOS-MEMS Flow Sensor With Low Power Pulse Operation
Leveraging More-than-Moore technology, we demonstrate an integrated CMOS MEMS flow sensor via a very compact system on chip (SoC) that can sense the bidirectional N2 gas flow. Our SoC features a very low-noise instrumentation amplifier that is implemented on a CMOS wafer and serves as a readout integrated circuit for a thermoresistive micro-calorimetric flow sensor which is fabricated on a MEMS wafer. A compact heterogeneous integration is achieved by combining the two wafers via the proprietary InvenSense AlN process. The measured sensitivity of our CMOS MEMS flow sensor is 98 mV/sccm which is three times better than the state-of-the-art counterpart. The flow range measured by our SoC is from −26 to 26 m/s (from −50 to 50 sccm). Moreover, the pulsed heater operation makes this proposed SoC flow sensor a very low power (<9 mW) and, thus, a promising candidate for the Internet-of-Things applications in smart home/green buildings.