Method and apparatus for measuring antenna radiation efficiency
First Claim
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1. An apparatus for measuring antenna radiation, efficiency, comprising:
- a frame having an inside space;
a random field forming unit, for forming a random field, said random field forming unit comprising at least two parts, said parts each arranged in the inside space of the frame, said parts each having a plurality of radio wave scatterers, and means for setting at random the intervals between the radio wave scatterers and the curvatures of the radio wave scatterers;
a transmitting antenna, having a predetermined antenna radiation efficiency, situated within the random field, for transmitting predetermined radio waves;
a to-be-measured antenna, situated within the random field, for transmitting predetermined radio waves, the antenna radiation efficiency of the to-be-measured antenna being unknown in advance;
a receiving antenna, situated apart from the random field, for receiving radio waves from the transmitting antenna and the to-be-measured antenna;
a field-strength meter for measuring a first cumulative probability of the receiving power corresponding to the transmitting antenna and a second cumulative probability of the receiving power corresponding to the to-be-measured antenna, in accordance with the radio waves received by the receiving antenna; and
computation means for computing the antenna radiation efficiency of the to-be-measured antenna in accordance with the first cumulative probability of the receiving power, the second cumulative probability of the receiving power and the antenna radiation efficiency of the transmitting antenna.
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Abstract
The present invention relates to an apparatus for measuring antenna radiation efficiency, wherein a random field measurement method can be adopted. In this apparatus, a to-be-measured antenna and a standard antenna are situated in a frame. In the frame, a plurality of rods, which are horizontally movable and extend vertically, are supported. A plurality of radio wave scatterers whose intervals and curvatures can be determined at random are held to the rods. In the frame, a random field is created by the radio wave scatterers.
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Citations
16 Claims
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1. An apparatus for measuring antenna radiation, efficiency, comprising:
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a frame having an inside space; a random field forming unit, for forming a random field, said random field forming unit comprising at least two parts, said parts each arranged in the inside space of the frame, said parts each having a plurality of radio wave scatterers, and means for setting at random the intervals between the radio wave scatterers and the curvatures of the radio wave scatterers; a transmitting antenna, having a predetermined antenna radiation efficiency, situated within the random field, for transmitting predetermined radio waves; a to-be-measured antenna, situated within the random field, for transmitting predetermined radio waves, the antenna radiation efficiency of the to-be-measured antenna being unknown in advance; a receiving antenna, situated apart from the random field, for receiving radio waves from the transmitting antenna and the to-be-measured antenna; a field-strength meter for measuring a first cumulative probability of the receiving power corresponding to the transmitting antenna and a second cumulative probability of the receiving power corresponding to the to-be-measured antenna, in accordance with the radio waves received by the receiving antenna; and computation means for computing the antenna radiation efficiency of the to-be-measured antenna in accordance with the first cumulative probability of the receiving power, the second cumulative probability of the receiving power and the antenna radiation efficiency of the transmitting antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for measuring antenna radiation efficiency, comprising:
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a frame having an inside space; a first random field forming unit, for forming a first random field, arranged in a first region of the inside space of the frame, having a plurality of radio wave scatterers, and a first means for setting at random the intervals between the radio wave scatterers of said first random field forming unit and curvatures of the radio wave scatterers of said first random field forming unit; a second random field forming unit, for forming a second random field, arranged in a second region of the inside space of the frame, having a plurality of radio wave scatterers, and a second means for setting at random the intervals between the radio wave scatterers of said second random field forming unit and the curvatures of the radio wave scatterers of said second random field forming unit; a transmitting antenna having a predetermined antenna radiation efficiency, situated within a space enclosed by said first and second random fields, for transmitting predetermined radio waves; a to-be-measured antenna, situated within said space, for transmitting predetermined radio waves, the antenna radiation efficiency of the to-be-measured antenna being unknown in advance; a receiving antenna, situated apart from said space, for receiving radio waves from the transmitting antenna and the to-be-measured antenna; a receiver for receiving radio waves from the transmitting antenna via the receiving antenna, and for receiving radio waves from the to-be-measured antenna via the receiving antenna; a signal processor for measuring a first cumulative probability of the receiving power in accordance with the received radio waves, and for measuring a second cumulative probability of the receiving power in accordance with the received radio waves; first computation means for computing difference data of the receiving power at the same value of the cumulative probability of the receiving power, in accordance with the first and second cumulative probabilities of the receiving power; and second computation means for computing the antenna radiation efficiency of the to-be-measured antenna in accordance with the difference data of the receiving power computed by the first computation means and the antenna radiation efficiency of the transmitting antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification