Antenna with built-in filter
First Claim
1. An antenna with a built-in filter comprising:
- a dielectric multilayer structure having a plurality of dielectric sheets, wherein at least one of the dielectric sheets includes an electroconductive film on a surface of said at least one of the dielectric sheets, the plurality of the dielectric sheets are laminated such that two or more filter blocks are formed to enable transmitting or receiving signals of two or more frequency bands; and
a radiation element fixed to the dielectric multilayer structure and connected to said filter blocks,wherein a first filter block of said filter blocks is formed in a combination of any of a low-pass filter, a high-pass filter, and a band elimination filter so as to cut a first signal having a first predetermined frequency band and to pass a second signal having a second predetermined frequency band, a second filter block of said filter blocks is formed in a combination of any of a low-pass filter, a high-pass filter, and a band elimination filter so as to pass said first signal and to cut said second signal, andwherein said first and second signals are different in frequency bands.
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Accused Products
Abstract
At least one filter block (25, 35, 45) is formed in a thin and flat dielectric multilayer structure (21) and fixed with radiation elements (2, 3). Each filter block includes at least one of a low-pass filter, a high-pass filter and a band-eliminating filter. On the surface (one major surface) side and/or the side face of the multilayer structure, at least one radiation element (2, 3) being connected with the filter block is provided and feeding parts (28, 38, 48) for supplying signal to the radiation elements are provided on the rear surface of the multilayer structure. Consequently, the antenna and the filter block are integrated and a small surface mountable antenna with a built-in filter of a structure such that signals are not mixed each other even when signals of a plurality of frequency bands are transmitted/received can be obtained.
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Citations
13 Claims
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1. An antenna with a built-in filter comprising:
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a dielectric multilayer structure having a plurality of dielectric sheets, wherein at least one of the dielectric sheets includes an electroconductive film on a surface of said at least one of the dielectric sheets, the plurality of the dielectric sheets are laminated such that two or more filter blocks are formed to enable transmitting or receiving signals of two or more frequency bands; and a radiation element fixed to the dielectric multilayer structure and connected to said filter blocks, wherein a first filter block of said filter blocks is formed in a combination of any of a low-pass filter, a high-pass filter, and a band elimination filter so as to cut a first signal having a first predetermined frequency band and to pass a second signal having a second predetermined frequency band, a second filter block of said filter blocks is formed in a combination of any of a low-pass filter, a high-pass filter, and a band elimination filter so as to pass said first signal and to cut said second signal, and wherein said first and second signals are different in frequency bands. - View Dependent Claims (2)
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3. An antenna with a built-in filter comprising:
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a thin and flat dielectric multilayer structure having a plurality of dielectric sheets, wherein at least one of the dielectric sheets includes an electroconductive film on a surface of said at least one of the dielectric sheets, the plurality of the dielectric sheets are laminated such that two or more filter blocks are formed to enable transmitting and receiving signals of two or more frequency bands; at least one radiation electrode provided on a main surface side of the dielectric multilayer structure and/or on a side surface of said dielectric multilayer structure, and a feeding part for supplying a signal to said radiation electrode provided on a back surface of said dielectric multilayer structure, wherein a first filter block is formed in a combination of any of a low-pass filter, a high pass filter, and a band elimination filter so as to cut a first signal having a first predetermined frequency band and to pass a second signal having a second predetermined frequency band, a second filter block of the filter blocks is formed in combination of a low-pass filter, a high-pass filter, and a band elimination filter so as to pass said first signal and cut second signal, and wherein said first and second signals are different in frequency bands. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification