Antenna for portable terminal and portable terminal using same
First Claim
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1. A dielectric resonator antenna being adapted to emit a radio wave by resonating a signal, said dielectric resonator antenna comprising:
- a conductive plate having a first and a second surface which are faced opposite to each other;
a dielectric placed opposite to said first surface of the conductive plate, said dielectric having a relative permeability (μ
ra) of μ
ra >
1;
an electrode provided to said dielectric and adapted to be supplied with said signal; and
a magneto-dielectric layer placed on said second surface of the conductive plate;
wherein said dielectric contains a magnetic material and a dielectric material to have frequency vs. antenna input impedance characteristics in which frequencies are partly superimposed in a half of resonance peak between a first mode on a low frequency side and a second mode on a high frequency side, andwherein said magneto-dielectric layer has a relative permeability (μ
rr) and a relative permittivity (∈
rr), where μ
rr is not less than ∈
rr, whereby said magneto-dielectric layer produces a mirror-image effect with respect to an electric field.
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Abstract
A dielectric resonator antenna which emits an electric wave by having a dielectric body resonate is disclosed. A magnetic material is contained in the electric body, thereby increasing the relative permeability to more than 1 and lowering the relative permittivity. Consequently, the Q-value of the resonance can be lowered while maintaining the rate of wavelength shortening. With this technique, a broadband dielectric resonator antenna can be realized.
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Citations
18 Claims
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1. A dielectric resonator antenna being adapted to emit a radio wave by resonating a signal, said dielectric resonator antenna comprising:
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a conductive plate having a first and a second surface which are faced opposite to each other; a dielectric placed opposite to said first surface of the conductive plate, said dielectric having a relative permeability (μ
ra) of μ
ra >
1;an electrode provided to said dielectric and adapted to be supplied with said signal; and a magneto-dielectric layer placed on said second surface of the conductive plate; wherein said dielectric contains a magnetic material and a dielectric material to have frequency vs. antenna input impedance characteristics in which frequencies are partly superimposed in a half of resonance peak between a first mode on a low frequency side and a second mode on a high frequency side, and wherein said magneto-dielectric layer has a relative permeability (μ
rr) and a relative permittivity (∈
rr), where μ
rr is not less than ∈
rr, whereby said magneto-dielectric layer produces a mirror-image effect with respect to an electric field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a dielectric resonator antenna that emits a radio wave by radiating a radio wave to a resonator formed by a dielectric and resonating said radiated radio wave in said dielectric, said method comprising:
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adjusting a relative permittivity on condition that a relative permeability exceeds 1, to thereby obtain a magneto-dielectric material that can achieve a predetermined wavelength shortening coefficient; forming said dielectric by the use of said magneto-dielectric material, wherein said dielectric contains a magnetic material and a dielectric material to have frequency vs. antenna input impedance characteristics in which frequencies are partly superimposed in a half of resonance peak between a first mode on a low frequency side and a second mode on a high frequency side; and forming a magneto-dielectric layer having a relative permeability (μ
rr) and a relative permittivity (∈
rr), where μ
rr is not less than ∈
rr, whereby said magneto-dielectric layer produces a mirror-image effect with respect to an electric field,wherein said magneto-dielectric material is produced by mixing together the magnetic material and the dielectric material.
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14. A method of manufacturing a dielectric resonator antenna that emits a radio wave by radiating a radio wave to a resonator formed by a dielectric and resonating said radiated radio wave in said dielectric, said method comprising:
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adjusting a relative permittivity on condition that a relative permeability exceeds 1, to thereby obtain a magneto-dielectric material that can achieve a predetermined wavelength shortening coefficient; forming said dielectric by the use of said magneto-dielectric material, wherein said dielectric contains a magnetic material and a dielectric material to have frequency vs. antenna input impedance characteristics in which frequencies are partly superimposed in a half of resonance peak between a first mode on a low frequency side and a second mode on a high frequency side; and forming a magneto-dielectric layer having a relative permeability (μ
rr) and a relative permittivity (∈
rr), where μ
rr is not less than ∈
rr, whereby said magneto-dielectric layer produces a mirror-image effect with respect to an electric field. - View Dependent Claims (15, 16, 17, 18)
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Specification