Active Antennas and Quasi-Optical Arrays by Amir Mortazwi, Tatsuo Itoh, James Harvey
By Amir Mortazwi, Tatsuo Itoh, James Harvey
"Whether communications, radar, transportation, or security drives your curiosity in solid-state units at microwave and millimeter-wave frequencies, this prepared reference publication will give you an invaluable evaluation of quasi-optical energy combining and lively built-in antennas. dropped at you in a single handy quantity are key reprinted papers from top specialists in microwave expertise. Their beneficial views variety from the most up-tp-date advances to old advancements. incorporated as a distinct function is an invited paper, never-before-published, which offers an outline of quasi-optical strength combining via famous authority J.W. Mink and co-workers. you will find different invaluable highlighted subject matters such as:* Transmitting and receiving lively antennas* Spatial strength combining oscillators* Spatial combining amplifiers* Beam regulate* energetic built-in antennas and quasi-optical platforms* research and CAD* rising technologies-two dimensional quasi-optics"Sponsored by:IEEE Microwave concept and strategies Society.
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5]. In this structure which is not planar, the diode wisker contact is elongated to several wavelengths and the diode and the wisker are placed in an open three-sided corner reflector, called the corner cube. RF and LO power can be coupled efficiently to the diode via this long wire antenna over one octave of frequency range. ,  developed a planar coupled slot quasioptical mixer shown in Fig. 2. Two slot antennas are fabricated on a 7-mil quartz substrate and are coupled to a Schottkybarrier chip diode via a quartz microstrip and a wisker contact wire that was mounted parallel to the substrate.
5) . A later design is based on a monolithic Load ~- SEMI-I NSULATI NG • Ga' GOLD GROUND PL ANE Ant. ( Fig, 3 - 110GHz monolithic quas i-optical mixer on a GaAs substrate ( © 1981 IEEE Reprinted with permission from Fig. J . D. A. H. Mrockowski, «High-performance quasi-optical GaAs monolithic mixer at 110GHz», IEEE Trans . Electron Devices, vol. 337: Millimeter Wave Technology, May 1982, Arlington, VA, Paper n. 30). tenna with a coupling probe which is connected to the Schottky-barrier diode fabricated with the antenna.
Noise figure is another important parameter for mixer design. This quantity is a function of diode parameters, diode mounting parasitics, and interfaces. If the mixer circuit noise figure is Fmix and its conversion loss is L c , then the overall noise figure of the system F sys is determined not only by Fmix but also by the noise figure F 1F of the IF system and the losses ill the antenna and RF path, La, and is given by F sys = La Fmix + La L; (FIF - 1) (3) This equation clearly indicates that loss in the antenna or RF path contributes directly to the system noise figure.