| 摘要 |
PURPOSE: To miniaturize a microstrip antenna and to widen a band by composing this system of a ground conductor plate, two radiating conductor plates, coaxial feeder line and two capacitors. CONSTITUTION: A ground conductor plate 2 and two radiating conductor plates 1 are parallelly arranged and two radiating conductor plates 1 are directly proximately arranged. The inner conductor of a coaxial feeder line 5 is connected to any arbitrary radiating conductor plate 1, and its outer conductor is connected to the ground conductor plate 2 just under or near the connecting point of the inner conductor. One capacitor is connected at least between the mutually proximate sides of respective radiating conductor plates 1, and one capacitor 4 is connected at least between one of mutually separated sides at least and the ground conductor plate 2 proximate to it. A gap L between the mutually separated sides of two radiating conductor plates 1 in this straight line direction is almost set from 0.50λe to 0.15λe (λe is a wavelength inside a pipe to be used).
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