Accession Number : ADA263759


Title :   Planar Active Antennas and Quasi-Optical Power Combining Arrays Using FET's and Slots


Corporate Author : CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE


Personal Author(s) : Kawasaki, Shigeo ; Itoh, Tatsuo


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263759.pdf


Report Date : 20 Mar 1993


Pagination or Media Count : 161


Abstract : This report presents design concepts and experimental data of planar active antenna and quasi-optical power combining arrays with strong coupling to realize a compact and low-cost radar and communication system. The prototype circuits for this purpose were made in a layered configuration using microstrip lines and in a uniplanar structure using CPW's. As an active source, an FET was selected. As a unit cell of the power combining array, a single layered active antenna using microstrip lines and slots was fabricated. In the design, small signal S-parameters were used to determine the circuit configuration while a large signal analysis to the entire circuit involving the slot antenna input impedance was carried out. The circuit designed for 10 GHz was found to operate at 9.3 GHz and the other designed for 25 GHz at 24 GHz. In addition, the circuit with CPW's and slot designed for 10 GHz was found to operate at 8.6 GHz. Based on these successful results, linear power combining arrays were made. For the strong coupling, each oscillator output is connected by a single transmission line. Several 6-element microstrip arrays and a 4-element CPW array were fabricated. In the former, sharp main beams were obtained. To obtain a millimeter-wave operating frequency, the second harmonic spatial power combining array made with FET's were demonstrated around 40 GHz. To show a topology of a 2-dimensional array, a 16-element dual polarized array at 7.8 GEL was made. To obtain the maximum in-phase radiation signal, impedance matching, a phase of the radiation signal and a signal phase of each oscillator were taken into account. Active antenna, Quasi-optical technique, Optical control, Spatial power combiner.


Descriptors :   *ANTENNAS , *COMMUNICATION AND RADIO SYSTEMS , *OPTICAL RADAR , *RADIO ENGINEERING , *SLOT ANTENNAS , ARRAYS , CELLS , CIRCUITS , CONFIGURATIONS , COSTS , COUPLINGS , EXPERIMENTAL DATA , FREQUENCY , GELS , HARMONICS , IMPEDANCE MATCHING , LOW COSTS , MATCHING , MILLIMETER WAVES , OPTICAL COMMUNICATIONS , OSCILLATORS , PHOTODETECTORS , POWER , PROTOTYPES , RADAR , SECOND HARMONIC GENERATION , SEMICONDUCTOR DEVICES , SIGNALS , TOPOLOGY , TRANSMISSION LINES , TUNING


Subject Categories : Electrical and Electronic Equipment
      Optical Detection and Detectors
      Radio Communications


Distribution Statement : APPROVED FOR PUBLIC RELEASE