Antenna apparatus
First Claim
Patent Images
1. An antenna apparatus comprising:
- a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;
a parasitic second antenna element installed on said base plate;
a first capacitor provided between an end of said second antenna element and said base plate; and
a switch circuit provided between, in parallel with said first capacitor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director.
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Abstract
The antenna apparatus of the present invention places antenna element 302 that transmits or receives electromagnetic waves on basic plate 301, places parasitic antenna elements 303 to 306 on basic plate 301 evenly spaced concentrically centered on antenna element 302, places switch elements 307 to 310 and capacitances 311 to 314 in parallel between one end of each of antenna elements 303 to 306 and said basic plate and disconnects one of switch elements 307 to 310 and connects all the others. In this way, the present invention provides a small and high-gain antenna apparatus with directivity switching capability.
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Citations
35 Claims
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1. An antenna apparatus comprising:
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a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;
a parasitic second antenna element installed on said base plate;
a first capacitor provided between an end of said second antenna element and said base plate; and
a switch circuit provided between, in parallel with said first capacitor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A communication terminal apparatus with an antenna apparatus, said antenna apparatus comprising:
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a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;
a parasitic second antenna element installed on said base plate;
a first capacitor provided between an end of said second antenna element and said base plate; and
a switch circuit provided between, in parallel with said first capacitor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director.
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15. A communication terminal apparatus with an antenna apparatus, said antenna apparatus comprising:
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a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;
a parasitic second antenna element installed on said base plate;
an inductor provided between an end of said second antenna element and said base plate; and
a switch circuit provided between, in parallel with said inductor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director.
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16. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves and a parasitic second antenna element on a base plate, placing a switch circuit and capacitor in parallel between one end of said second antenna element and said base plate, and turning on said switch circuit to cause said second antenna element to act as a reflector and turning off said switch circuit to cause said second antenna element to act as a director.
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17. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves on a base plate, placing a first parasitic second antenna element and a second parasitic second antenna element on the base plate symmetrically with respect to said first antenna element, placing a first switch circuit and a first capacitor in parallel between one end of said first parasitic second antenna element and said base plate and placing a second switch circuit and a second capacitor in parallel between one end of said second parasitic second antenna element and said base plate, turning on said first switch circuit to cause said first parasitic second antenna element to act as a reflector and turning off said first switch circuit to cause said first parasitic second antenna element to act as a director and turning on said second switch circuit to cause said second parasitic second antenna element to act as a reflector and turning off said second switch circuit to cause said second parasitic second antenna element to act as a director, wherein when said first switch circuit is turned on, said second switch circuit is turned off and when said first switch circuit is turned off, said second switch circuit is turned on.
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18. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves a base plate, placing an even number of parasitic second antenna elements on the base plate evenly spaced concentrically centered on said first antenna element, placing a switch circuit and capacitor in parallel between one end of each of said second antenna elements and said base plate, and turning off one of said switch circuits to cause the one of said second antenna elements associated therewith to act as a director and turning on all other ones of said switch circuits to cause the ones of said second antenna elements associated therewith to act as reflectors.
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19. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves and a parasitic second antenna element on a base plate, placing a switch circuit and inductor in parallel between one end of said second antenna element and said base plate, and turning on said switch circuit to cause said second antenna element to act as a reflector and turning off said switch circuit to cause said second antenna element to act as a director.
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20. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves on a base plate, placing a first parasitic second antenna element and a second parasitic second antenna element on the base plate symmetrically with respect to said first antenna element, placing a first switch circuit and a first inductor in parallel between one end of said first parasitic second antenna element and said base plate and placing a second switch circuit and a second inductor in parallel between one end of said second parasitic second antenna element and said base plate, performing control including turning on said first switch circuit to cause said first parasitic second antenna element to act as a reflector and turning off said first switch circuit to cause said first parasitic second antenna element to act as a director and turning on said second switch circuit to cause said second parasitic second antenna element to act as a reflector and turning off said second switch circuit to cause said second parasitic second antenna element to act as a director, wherein when said first switch circuit is turned on, said second switch circuit is turned off and when said first switch circuit is turned off, said second switch circuit is turned on.
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21. An antenna directivity switching method, comprising:
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placing a first antenna element for transmitting or receiving electromagnetic waves on a base plate, placing an even number of parasitic second antenna elements on the base plate evenly spaced concentrically centered on said first antenna element, placing a switch circuit and inductor in parallel between one end of each of said second antenna elements and said base plate, and performing control including turning off one of said switch circuits to cause the one of said second antenna elements associated therewith to act as a director and turning on all other ones of said switch circuits to cause the ones of said second antenna elements associated therewith to act as reflectors.
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22. An antenna apparatus comprising:
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a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;
a parasitic second antenna element installed on said base plate;
a first inductor provided between an end of said second antenna element and said base plate; and
a switch circuit provided between, in parallel with said first inductor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification