Capacitively loaded PIFA
First Claim
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1. An antenna device, comprising:
- (a) a first conductor plate forming a transmission plate and having first and second ends,(b) a second conductor plate disposed below and arranged approximately in parallel with the first conductor plate and forming a ground conductor of the antenna device,(c) means for electrically connecting the first conductor plate with the second conductor plate,(d) a capacitive load connected between the first end of said first conductor plate and said second conductor plate and comprising a third conductor plate connected to said first end of said first conductor plate and parallel to and spaced from said second conductor plate; and
(e) a capacitive feed to said conductor plates.
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Abstract
A planar inverted-F antenna is described that is provided with a capacitive load that allows the dimensions of the antenna to be reduced from a conventional λ/4 to λ/8. To maintain good bandwidth and impedance matching in spite of the presence of the capacitive load, a capacitive feed is also provided.
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Citations
17 Claims
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1. An antenna device, comprising:
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(a) a first conductor plate forming a transmission plate and having first and second ends, (b) a second conductor plate disposed below and arranged approximately in parallel with the first conductor plate and forming a ground conductor of the antenna device, (c) means for electrically connecting the first conductor plate with the second conductor plate, (d) a capacitive load connected between the first end of said first conductor plate and said second conductor plate and comprising a third conductor plate connected to said first end of said first conductor plate and parallel to and spaced from said second conductor plate; and (e) a capacitive feed to said conductor plates. - View Dependent Claims (2, 3, 4, 5)
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6. An antenna device, comprising:
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(a) a first conductor plate forming a transmission plate and having first and second ends, (b) a second conductor plate disposed below and arranged approximately in parallel with the first conductor plate and forming a ground conductor of the antenna device, (c) means for electrically connecting the first conductor plate with the second conductor plate, and (d) a capacitive load connected between the first end of said first conductor plate and said second conductor plate and comprising a pair of parallel spaced capacitor plates, a first one of said capacitor plates being connected to said first end of said first conductor plate and a second one of said capacitor plates being connected to said second conductor plate. - View Dependent Claims (7, 8, 9, 10, 11)
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12. An antenna device, comprising:
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(a) a first conductor plate forming a transmission plate and having first and second ends, (b) a second conductor plate disposed below and arranged approximately in parallel with the first conductor plate and forming a ground conductor of the antenna device, (c) means for electrically connecting the first conductor plate with the second conductor plate, (d) a capacitive load connected between the first end of said first conductor plate and said second conductor plate, comprising a plate extending normal to said first conductor plate towards but not reaching said second conductor plate, and (e) a capacitive feed to said conductor plates. - View Dependent Claims (13, 14, 15)
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16. An antenna device, comprising:
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(a) a first conductor plate forming a transmission plate and having first and second ends, (b) a second conductor plate disposed below and arranged approximately in parallel with the first conductor plate and forming a ground conductor of the antenna device, (c) means for electrically connecting the first conductor plate with the second conductor plate, (d) a capacitive load connected between the first end of said first conductor plate and said second conductor plate, and (e) a capacitive feed comprising a conductor plate electrically connected to said second conductor plate and spaced from and parallel to the first conductor plate at a location between the first and second ends of said first conductor plate. - View Dependent Claims (17)
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Specification