Value chain · CLM-1139
In plain terms
A 1995 Japanese blimp carrying a three-by-three-metre rectenna flew for four minutes at fifty metres on ten kilowatts of microwaves from two magnetrons and a dish.
The claim as recorded
In 1995 Kobe University's ETHER airship "received 10 kW of microwave power at 2.45 GHz" from "a parabolic antenna/dual magnetron system" onto a 3 x 3 m "(1200 element) rectenna array, allowing it to fly at a height of 50 m for four minutes".
Evidence behind this: T2-review restatement of Kaya et al. 1996 [82], not held; "received 10 kW" is the review's phrase and its boundary is not stated.
Scope and limits
THE 10 kW HAS NO STATED BOUNDARY (transmitted, incident or rectified) AND NO EFFICIENCY IS GIVEN. Primary not held. The review's Fig. 2 has no point that matches 10 kW at 50 m, so the chart did not treat 10 kW as receiver output.
What it assumes
"Received 10 kW" is RF incident on or captured by the array, not DC output; the review does not say which.
Where it comes from
PDF 9 / printed 237: "In 1995" (raw) a Kobe University researcher "constructed the airship seen in Fig. 14(b)" (normalised); "received 10 kW of microwave power at 2.45 GHz [82]" (normalised); "The energy was transmitted from a parabolic antenna/dual magnetron system to the blimp's 3 m" (normalised) x 3 m; "(1200 element) rectenna array, allowing it to fly at a height of 50 m for four minutes" (R1). Recomputed: 9 m2, 75 cm2 per element (8.7 cm or 0.71-lambda pitch); 10 kW / 9 m2 = 1.1 kW/m2 if the 10 kW is RF on the array.
Basis: kW; GHz; m; m2; element count; minutes
Cite this
energyaperture.com/c/clm-1139
CLM-1139, Energy Aperture, as of 2021-01.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-269
- CLM-1134The field's own 2021 scorecard: the two records were both set in 1975 (30-35 kW across about a mile, and 54 per cent DC in to DC out at...CLM-1135Modern power beaming, by the review's dating, starts in 1963 with a radar tube, a horn five and a half metres away and a single vacuum-tube...CLM-1136The famous 1964 helicopter hung fifteen metres up for ten hours on beamed microwaves, rectified by four and a half thousand diodes; then...CLM-1137In 1987 a Canadian model plane with a four-and-a-half-metre wingspan flew for twenty minutes at 150 metres on nothing but a microwave beam...CLM-1138A 1994 Japanese test sent five kilowatts from a three-metre dish to an eleven-square-metre rectenna 42 metres away and caught about...CLM-1141In 2002 a metre-wide rectenna moved along an exhibition floor in Houston, tracked by a self-steering 5.8 GHz beam, converting 82 per cent...CLM-1142In 2015 Mitsubishi Heavy sent ten kilowatts of microwaves half a kilometre along a Kobe pier to an eight-by-eight-metre receiver, enough to...CLM-1143Japan's flagship 2015 ground test: a solid-state GaN array of about one and a half square metres sent 1.8 kilowatts 55 metres and 335 watts...More on the source page.