Slot antenna

Details Slot antenna Slot antenna

2007-03-22

2008-07-08

Wimer, Michael C (Department: 2821)

Communications: radio wave antennas

Antennas

Slot type

Reexamination Certificate

active

07397439

ABSTRACT:
A slot antenna according to the present invention includes: a ground conductor12provided on a rear face side of a dielectric substrate101, the ground conductor having a finite area; a slot14which recesses into the ground conductor12, beginning from an open-end point on a side edge of the ground conductor12; and a feed line261for supplying a high-frequency signal to the slot14, the feed line261intersecting the slot14. At a first point near the slot, the feed line261branches into a group of branch lines including at least two branch lines, such that at least two branch lines in the group of branch lines are connected to each other at a second point near the slot to form at least one loop line209. A maximum value of a loop length of each loop line209is prescribed to be less than 1× effective wavelength at an upper limit frequency of an operating band of the slot antenna. In the group of branch lines, any branch line that does not constitute a part of the loop line209but terminates with a leading open-end point has a branch length which is less than a ¼ effective wavelength at the upper limit frequency of the operating band.

REFERENCES:
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L. Zhu et al. “A Novel Broadband Microstrip-Fed Wide Slot Antenna With Double Rejection Zeros”, IEEE Antennas and Wireless Propagation Letters, 2003, pp. 194-196, vol. 2.
Yamakawa, K., et al., “A Basic Study of Hole-Slot Cavity Antenna using Loop Feeding”, 1991 Spring National Convention Record, 1991, pp. 2-136, B-136 Part 2, The Institute of Electronics, Information and Communication Engineers.
Imada, et al., “A Discussion of Downsizing of a Slot Antenna with a Loop Feeding Activity”, 1999 Joint Convention Record, 1989, p. 158, The Hokkaido Chapters of the Institutes of Electrical and Information Engineers.

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