Electric heating – Microwave heating – With specific generator
Patent
1995-06-19
1996-09-24
Leung, Philip H.
Electric heating
Microwave heating
With specific generator
219748, 219695, 330295, 331107R, 331110, H05B 672
Patent
active
055588000
ABSTRACT:
The output matching networks normally included in a microwave power transistor package as well as the transistor combining network therefor are eliminated for heating applications, e.g. microwave ovens. In a preferred embodiment, the transistor dies of four microwave silicon bipolar power transistors are directly connected to the low impedance points of a common patch type antenna element, also referred to as an applicator, located within the wall of a heating chamber in place of a magnetron. Each pair of power transistors are electrically spaced one half wavelength apart and are located transverse to each other on the antenna. The transistors are operated in pairs with a 180.degree. phase difference so that mutually orthogonal longitudinal modes are excited in the antenna. Moreover, the transistors are frequency modulated over their prescribed frequency band to eliminate standing waves in the load, i.e. the article or substance being heated or cooked. Either one or a plurality of patch antennas can be used and operated, moreover, at two different frequencies allowed for heating applications, typically 915 MHz and 2450 MHz.
REFERENCES:
patent: 3557333 (1971-01-01), McAvoy
patent: 3691338 (1972-09-01), Chang
patent: 3867607 (1975-02-01), Ohtani
patent: 3953702 (1976-04-01), Bickel
patent: 4006338 (1977-02-01), Dehn
patent: 4097708 (1978-06-01), Bickel
patent: 4415789 (1983-11-01), Nobue et al.
patent: 4504718 (1985-03-01), Okatsuka et al.
patent: 4621179 (1986-11-01), Kusunoki et al.
patent: 4714812 (1987-12-01), Haagensen et al.
patent: 5179264 (1993-01-01), Cuomo et al.
patent: 5208554 (1993-05-01), Endler et al.
Edwards C. O.
Leung Philip H.
Northrop Grumman
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