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US 5,764,190 AGranted
Capacitively loaded PIFA
AssigneeThe Hong Kong University of Science and Technology
InventorsRoss David Murch, Corbett Ray Rowell
Life of this patent
Estimating the term…
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 .lambda./4 to .lambda./8. To maintain good bandwidth and impedance matching in spite of the presence of the capacitive load, a capacitive feed is also provided.
Claims17
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.
3 more elements
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, 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.
1 more element
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, 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.
2 more elements
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
- (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.
2 more elements
Dependencies are inferred from the claim text.