Value chain · CLM-1142
In plain terms
In 2015 Mitsubishi Heavy sent ten kilowatts of microwaves half a kilometre along a Kobe pier to an eight-by-eight-metre receiver, enough to light up its logo; the review gives no figure for how much came out the other end.
The claim as recorded
On 24 February 2015 Mitsubishi Heavy Industries "announced that they had set a microwave power beaming record in Japan by transmitting 10 kW of 2.45-GHz RF power over a 500-m distance" on a pier at the Kobe Shipyard, using phase-controlled magnetrons of Kyoto University design; the transmit and rectenna arrays are both 8 x 8 m and "The power received was used to light up the MHI logo".
Evidence behind this: T2-review restatement of a Nikkei Asian Review news item [97] and a Kyoto design paper [98]; the record is the company's announcement as the review relays it.
Scope and limits
NO RECEIVED POWER AND NO EFFICIENCY: "received" occurs once in the paragraph, for the logo. Sources are a news report and a design paper; primary test data not held. The review's Fig. 2 has no point for it, consistent with no received figure. The 24 February 2015 date is the review's; its cited source for the announcement ([97]) is a Nikkei Asian Review article of 16 March 2015, and the MHI press release is not held, so the announcement date is unconfirmed.
What it assumes
"Transmitting 10 kW" is RF from the array, as the review says.
Where it comes from
PDF 10 / printed 238: "On February 24, 2015, Mitsubishi Heavy Industries, Ltd. (MHI) announced that they had set a microwave power beaming record in Japan by transmitting 10 kW of 2.45-GHz RF power over a 500-m distance [97]" (normalised); "The test was conducted on a pier at the Kobe Shipyard and Machinery Works in Hyogo Prefecture" (normalised); "The transmitter used phase controlled magnetrons based on Kyoto University design [98]" (normalised); "Both are 8 m" (normalised) x 8 m; "The power received was used to light up the MHI logo as seen in Fig. 20(b)" (normalised). Recomputed: 64 m2; 10 kW / 64 m2 = 156 W/m2 across the transmit face.
Basis: kW RF; GHz; m; m x m
Cite this
energyaperture.com/c/clm-1142
CLM-1142, 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-1139A 1995 Japanese blimp carrying a three-by-three-metre rectenna flew for four minutes at fifty metres on ten kilowatts of microwaves from...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-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.