Printed antenna structure
First Claim
1. A method for designing a printed antenna structure for transmission of a spectrum of electromagnetic waves having a wavelength λ
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g at the center frequency f0, wherein c is the speed of light, f0 is the center frequency of electromagnetic waves, and ∈
re is the equivalent dielectric constant, said method comprising;
assuming an open transmission line for transmission of the electromagnetic waves with the wavelength λ
g having a length L, and L=λ
g/4, wherein the input impedance of the open transmission line is jXt, Z0 is the characteristic impedance of the transmission line and jXt=−
jZ0cot(2π
L/λ
g);
preparing the printed antenna structure, said printed antenna structure comprising a primary radiating element and a tuning element electrically connected to one end of the primary radiating element, said primary radiating element having an overall length of L2, said tuning element comprising two stubs, each one of the stubs having a length of L1 and including a free end spaced apart from each other and a fixed end connected to the primary radiating element, wherein the overall input impedance of the combination of the primary radiating element and the tuning element is also equal to jXt;
calculating the values of L1 and L2 for obtaining a minimum value of f(β
L1), and using the calculated L1 and L2 to design the printed antenna structure.
1 Assignment
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Accused Products
Abstract
The present invention discloses a printed antenna structure. The printed antenna structure comprises: a dielectric layer having opposed surfaces, a ground plane layer covered on the first surface of the dielectric layer, a feed-line extending over the second surface of the dielectric layer and connecting to a driving circuitry, a primary radiating element connected to the feed-line and not extending over to the ground plane layer, and a tuning element connected to the primary radiating element and not extending over to the ground plane layer for adjusting the radiating frequency. The timing element her comprises two stubs each having a free end spaced apart from each other and a fixed end connected to the primary radiating element so as to reduce the overall length of the printed antenna.
112 Citations
12 Claims
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1. A method for designing a printed antenna structure for transmission of a spectrum of electromagnetic waves having a wavelength λ
-
g at the center frequency f0, wherein
c is the speed of light, f0 is the center frequency of electromagnetic waves, and ∈
re is the equivalent dielectric constant, said method comprising;assuming an open transmission line for transmission of the electromagnetic waves with the wavelength λ
g having a length L, and L=λ
g/4, wherein the input impedance of the open transmission line is jXt, Z0 is the characteristic impedance of the transmission line and jXt=−
jZ0cot(2π
L/λ
g);
preparing the printed antenna structure, said printed antenna structure comprising a primary radiating element and a tuning element electrically connected to one end of the primary radiating element, said primary radiating element having an overall length of L2, said tuning element comprising two stubs, each one of the stubs having a length of L1 and including a free end spaced apart from each other and a fixed end connected to the primary radiating element, wherein the overall input impedance of the combination of the primary radiating element and the tuning element is also equal to jXt;
calculating the values of L1 and L2 for obtaining a minimum value of f(β
L1), and using the calculated L1 and L2 to design the printed antenna structure.- View Dependent Claims (2, 3)
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g at the center frequency f0, wherein
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4. A printed antenna comprising:
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a primary radiating element and a tuning element electrically connected to one end of the primary radiating element, said primary radiating element having an overall length of L2, said tuning element further comprising two stubs, the stubs each having a length of L1 and including free ends spaced apart from each other, an fixed ends connected to the primary radiating element, wherein the overall input impedance of the combination of the primary radiating element and the tuning element is equal to jX1, wherein jX1 is calculated by assuming an open transmission line for transmission of the electromagnetic waves with the wavelength λ
g having a length L, where L=λ
g/4, wherein the input impedance of the open transmission line is jX1, Z0 is the characteristic impedance of the transmission line and jX1=jZ0cot(2nL/λ
g); and
the values of L1 and L2 for obtaining a minimum value of ∫
(β
L1) are calculated by the equation;
wherein the printed antenna structure transmits a spectrum of electromagnetic waves having a wavelength λ
g at a center frequency f0, wherein
c is the speed of light, ∫
0 is the center frequency of electromagnetic waves, and ∈
re is the equivalent dielectric constant. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification