A 16-element reflection grid amplifier with improved heat sinking

Guyette, Andrew C.; Swisher, Randall; Lécuyer, F.; Al-Zayed, Ayman S.; Kom, A.; Lei, Su-Tak Chad; Oliveira, Mayara; Li, Ping; Lisio, M. De; Sato, Ken-ichi; Oki, A.K.; Gutierrez-Aitken, A.L.; Kagiwada, R.S.; Cowles, J.

doi:10.1109/mwsym.2001.967265

Cited by 4 publications

(1 citation statement)

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“…These research investigations include increasing operating frequencies [I]- [2], optimizing for power and efficiency [3]- [4], improving bandwidth [SI, the removal of excess heat produced by the active devices [6], minimizing substrate mode effects [7] and others.…”

Section: Introouctionmentioning

confidence: 99%

Numerical and experimental investigation of losses in a tray based spatial power amplifier

Al-Zayed

Ortiz²,

Ozkar

et al.

IEEE MTT-S International Microwave Symposium Digest, 2003

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4Abslracf -This paper presents experimental and numerical investigations on a 49-element Ka-band amplifier array. This study is aimed at determining the origin of various losses in the amplifier array. Passive simulation data confirms that the load seen by the active devices is well matched and that most of the power is coupled to the LSE,@ mode. This means that coherent power combining should take place if there is no phase and amplitude variation due to the active devices and phase correcting dielectric lenses. I. INTROOUCTIONSpatial (quasi-optical) power combining refers to combining the outputs of many active devices in free space. Several architectures have been developed for spatial power combining, integrating solid state devices to generate noteworthy power levels at a different range of frequency bands. Spatial combining also encompasses a broad rage of microwave circuits. These include amplifier, oscillators, beam controllers, and frequency converters.After much success in demonstrating the principles and concepts of spatial combining, researchers have directed there efforts on improving the structures and addressing important disadvantages and limitations associated with spatial power-combining techniques. These research investigations include increasing operating frequencies [I]-[2], optimizing for power and efficiency [3]-[4], improving bandwidth [SI, the removal of excess heat produced by the active devices [6], minimizing substrate mode effects [7] and others.The performance of a spatial amplifier array is affected by many factors. These factors are highly dependent on the type of amplifier array as well as the method of exciting the array. This paper studies the performance of the Ka-hand perpendicularly-fed patch amplifier array that is excited using a hard-hom antenna [2]. This amplifier can produce 6 watts of power, with a power combining efficiency of 39%.A drawing illustrating the concept for this amplifier array configuration is shown in Fig. 1. The patch antennas on the left of the diagram receive a signal radiated from 0-7803-769S-1/03/$17.00 0 2003 IEEE the transmitting hard hom. Each of the microstrip patch antennas is coupled to slot aperture, which then feeds a dielectric filled waveguide. The dielectric filled waveguide is then coupled to a microstrip line, which then feeds the MMIC amplifier. After amplification, the signal is radiated through the transmitting patch antenna in the same way that it was received. Finally, the signal radiated from the patch antennas are collected by a receiving hard hom located at the right of the figure. Hard-horns and dielectric lenses are used to provide a uniform amplitude and phase to the array of patch antennas, improving the combining efficiency of the system [8]-[9].

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Section: Introouctionmentioning

confidence: 99%