Method for designing a small antenna matched to an input impedance, and small antennas designed according to the method
First Claim
1. A method for designing a small antenna matched to a required input impedance and operating at a desired frequency, the impedance having a real part and an imaginary part, the method comprising:
- a. choosing an impedance matching point related to a singular point, and b. canceling the imaginary part of the input impedance, thereby obtaining a design of an antenna matched to the required impedance and operating at a desired frequency.
3 Assignments
0 Petitions
Accused Products
Abstract
A method for designing a high performance, small antenna that is matched to a required output impedance, does not require filtering, is simple and inexpensive to manufacture, and is easily integrable with an RF power amplifier- with minimum cost, minimum external components and minimum energy losses. The method includes finding a singular point (102) in the impedance vs. antenna geometrical dimension/wavelength ratio graph, the singular point (102) exhibiting a high very high positive reactance, setting the antenna geometry to match this point, and canceling the very high positive reactance (high inductance) resulting from this match by adding to the antenna a very small capacitance, preferably provided by at least one gap capacitor (202) The antenna is preferably a loop antenna (200), and both the antenna and the gap capacitor (202) (204) are preferably implemented by printing methods on printed circuit board or ceramic substrates. The antenna (200) may also be implemented in non-differential designs.
28 Citations
24 Claims
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1. A method for designing a small antenna matched to a required input impedance and operating at a desired frequency, the impedance having a real part and an imaginary part, the method comprising:
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a. choosing an impedance matching point related to a singular point, and b. canceling the imaginary part of the input impedance, thereby obtaining a design of an antenna matched to the required impedance and operating at a desired frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for obtaining a small loop antenna having geometrical dimensions designed to work at a required frequency, the loop antenna matched to a required input impedance, the method comprising:
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a. obtaining an optimal design based on matching a singular point defined by the input impedance and by a correlation between the geometrical dimensions and the required frequency, and b. implementing said design. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A small antenna matched to an input impedance, said input impedance having a very high positive reactance before the matching, the antenna designed to work at a desired frequency, the antenna comprising:
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a. an antenna element having at least one geometrical dimension related to the frequency, said relationship correlated with the very high positive reactance, and b. a capacitance added to said antenna element, said capacitance canceling the very high positive reactance, whereby the antenna is matched to the input impedance and operates in a very narrow frequency band. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification