Table 2.

The wingbeat frequency measurement results using W-band and S-band radars.

Radar	No.	Body (mm)		Wingspan/mm	Wingbeat Freq. (Hz)
		Length	Width		Amplitude method	Phase method	Stroboscope
W-band radar	1	21	4	36	29.00	28.88	28.57
	2	20	4	36	29.13	29.13	29.00
	3	25	5	40	33.27	30.63	30.44
	4	18	4	37	32.00	32.25	32.28
	5	20	5	39	34.75	34.38	34.07
	6	16	4	32	37.25	37.38	37.47
	7	10	3	20	37.75	37.50	37.25
	8	23	5	44	36.63	37.75	37.00
	9	23	6	42	39.75	39.88	39.00
	10	39	10	58	40.13	40.13	40.18
	11	18	4	34	43.50	42.75	42.00
	12	31	8	50	49.75	50.25	49.61
	13	24	5	42	56.13	56.38	56.33
S-band Radar	14	27	6	63	21.97	19.53	20.24
	15	41	10	102	24.41	24.41	25.41
	16	24	5	42	29.30	30.52	30.65
	17	42	10	82	32.96	31.74	32.98
	18	35	7	70	35.16	35.16	36.70
	19	30	6	44	41.50	41.50	40.34
	20	30	7	47	63.48	63.71	62.75

Note: These experimental results are arranged in order of wingbeat frequency with the lowest at top. In addition, because the insect is limited and adhered to a piece of polystyrene foam in the experiment, the wing beating may be affected and the typical value of wingbeat frequency of these species cannot be used as the reference frequency for comparisons.