Emerging uni-planar microwave circuit and system

Hanxiang Zhang

Microwave systems have been enjoying splendid evolution and applications in recent years. Benefit from that, smart phones, WiFi systems, and RFID technologies have become part of everyday life. However, the whole system would be complicated due to the integration of various circuit components, which sometimes would degrade the system performance. As a result, there is a necessity for circuits in novel architectures and topologies, for simplified and efficient design. At first, to optimize the performance of and simplify the microwave circuit, a new real microstrip line crossover with arbitrary port impedance is proposed. It features symmetrical structure and 180° phase delay from input port to output ports which can release the constraint of 50 Ω port reference impedance. To verify the proposed concepts, the crossover operating at 5.8GHz is fabricated, both simulated and test results agree well with design theory. By concurrently receiving and comparing the signals from multiple directional radiation beam, monopulse tracking radar is able to estimate the range, velocity of scatters and angles of arrival object in three-dimensional doppler map, which attracts great interest in wireless communications, radar, remote sensing, imaging, and autonomous driving applications. In the study, two types of comparator network composed of novel couplers are presented. Both of them feature the symmetrical input ports and output ports. It is the first time that the cost-effective planar comparator is investigated to untether it from complex multilayer designs or expensive waveguide solutions. To prove the concept, two comparator networks operating at 5.8GHz are designed, both are verified by simulations and measurements. Additionally, a microstrip line reflection-type phase shifter is presented for 60 GHz millimeter wave phased array system. Based on the characteristic of varactor diode, an impedancetransforming quadrature coupler and a novel parallel resonant network are designed to extend the phase tuning range. To the best of our knowledge, it is the first time a uni-planar microstrip line phase shifter is implemented at 60 GHz to achieves 93.3° phase tuning range. The analytical equations are derived for the design theory, and EM simulation and measurement are conducted to proof the proposed concept.

Emerging uni-planar microwave circuit and system

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