Broadband microstrip antenna with automatically progressively shortened resonant dimensions with respect to increasing frequency of operation
First Claim
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1. A broadband microstrip antenna comprising:
- a conductive radiator patch spaced over an underlying conductive surface and having resonant dimensions corresponding to a first predetermined frequency of operation; and
series-resonant impedance means connected to plural predetermined locations on said radiator patch for automatically and progressively changing the effective resonant dimensions of the antenna and thereby permitting effective operation over a broader range of frequencies.
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Abstract
Variable impedance devices (e.g., series resonant circuits and/or transmission line tuning stubs) are connected to predetermined locations on a microstrip radiator patch for changing the effective resonant dimensions of the antenna as a function of frequency and thereby permitting operation over a broad range of frequencies.
44 Citations
28 Claims
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1. A broadband microstrip antenna comprising:
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a conductive radiator patch spaced over an underlying conductive surface and having resonant dimensions corresponding to a first predetermined frequency of operation; and series-resonant impedance means connected to plural predetermined locations on said radiator patch for automatically and progressively changing the effective resonant dimensions of the antenna and thereby permitting effective operation over a broader range of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A broadband microstrip antenna comprising:
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a conductive radiator patch spaced over an underlying conductive surface; said radiator patch having one portion effectively shorted to the underlying surface and an edge left open-circuited to define a radiating aperture for the included cavity at a low frequency corresponding to the effective distance between said one portion and said edge; and series-resonant impedance means connected to plural predetermined locations on said radiator patch for automatically and progressively shorting such locations to the underlying surface and thereby automatically changing the effective resonant dimensions of said cavity as required to permit effective operation of the antenna over a broadened range of frequencies. - View Dependent Claims (9, 10, 11, 12)
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13. A broadband microstrip antenna comprising:
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an electrically conductive reference surface; an electrically conductive radiator patch spaced from an overlying said reference surface and defining a resonant cavity therebetween; said resonant cavity having a first resonant dimension corresponding to a first lower frequency; a plurality of first reactive resonator means affixed to said radiator patch at a plurality of respectively corresponding predetermined locations therewithin, each of said first resonator means electrically resonating at a common first predetermined frequency to automatically change the effective resonant dimensions of said resonant cavity such that it corresponds to a second higher frequency when fed with higher frequency signals; and feed means connected to said radiator patch for feeding electromagnetic signals thereto over the range of frequencies extending from said first lower frequency to said second higher frequency. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification