Non-powered element
AssigneePacific Industrial Co., Ltd.
InventorYasuhisa Tsujita
Life of this patent
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Abstract
A parasitic element is used in a transmitter configured to transmit data. The transmitter includes a loop antenna to which power is supplied and a housing that accommodates the loop antenna. The parasitic element is disposed to be located outside the housing. The parasitic element includes a loop portion that is a part of the parasitic element, and an extended section that is a part other than the loop portion. The loop portion is electromagnetically coupled to the loop antenna. The extended section includes a first end of the parasitic element as an open end.
Claims7
A parasitic element for use in a transmitter configured to transmit data, wherein
- the transmitter includes a loop antenna to which power is supplied and a housing that accommodates the loop antenna,
- the parasitic element is disposed to be located outside the housing and includes:
- a loop portion that is a part of the parasitic element;
- and
- one extended section that is a part other than the loop portion and extends from the loop portion,
- the loop portion is configured to be electromagnetically coupled to the loop antenna, the parasitic element includes a first end that is an open end and a second end configured to be connected to a ground,
- the extended section includes the first end of the parasitic element, and
- the extended section has a length of 0.20λ, where λ is a wavelength at an operating frequency of the loop antenna.
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A parasitic element for use in a transmitter configured to transmit data, wherein
- the transmitter includes a loop antenna to which power is supplied and a housing that accommodates the loop antenna,
- the parasitic element is disposed to be located outside the housing and includes:
- a loop portion that is a part of the parasitic element;
- and
- two extended sections located on opposite sides of the loop portion, each of the two extended sections being a part other than the loop portion and extending from the loop portion,
- the loop portion is configured to be electromagnetically coupled to the loop antenna,
- each of the two extended sections includes one of ends of the parasitic element as an open end, and
- the two extended sections each have a length of 0.22λ, where λ is a wavelength at an operating frequency of the loop antenna.
Dependencies are inferred from the claim text.