Aperture-coupled planar inverted-F antenna

Patent 6072434 Issued on June 6, 2000. Estimated Expiration Date:

February 4, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Wideband, aperture-coupled microstrip antenna
Patent #: 4847625
Issued on: 07/11/1989
Inventor: Dietrich , et al.

Slot coupled microstrip constrained lens
Patent #: 4899164
Issued on: 02/06/1990
Inventor: McGrath

Plural frequency patch antenna assembly
Patent #: 5043738
Issued on: 08/27/1991
Inventor: Shapiro, et al.

Microstrip antenna for two-frequency separate-feeding type for circularly polarized waves
Patent #: 5173711
Issued on: 12/22/1992
Inventor: Takeuchi, et al.

Wideband double C-patch antenna including gap-coupled parasitic elements
Patent #: 5627550
Issued on: 05/06/1997
Inventor: Sanad

Antenna apparatuus using a short patch antenna Patent #: 5801660
Issued on: 09/01/1998
Inventor: Ohtsuka, et al.

Inventor

Papatheodorou, Stelios

Application

No. 794077 filed on 02/04/1997

US Classes:

343/700MS, Microstrip343/702, With radio cabinet343/846With grounding structure (including counterpoises)

Examiners

Primary: Le, Hoanganh

Foreign Patent References

WO 97/44846 WO. 11/22/1997

International Classes

H01Q 001/38
H01Q 001/24

Abstract

An aperture-coupled planar inverted-F antenna (PIFA) including a radiating patch formed on one side of a ground plane and separated therefrom by a first dielectric which may be air, foam or another suitable material. A shorting strip connects a side of the radiating patch to the ground plane at a point corresponding to a dominant mode null, such that the size of the radiating patch may be reduced by a factor of two. A microstrip feedline is arranged on an opposite side of the ground plane and separated therefrom by a second dielectric which may be part of a substrate formed of printed wiring board material. Signals are coupled between the microstrip feedline and the radiating patch via an aperture formed in the ground plane. The use of aperture coupling avoids the excessive cost associated with conventional TEM transmission line or coaxial feeds, while providing improved manufacturability and ease of integration relative to PIFAs with conventional feeds. Moreover, the aperture coupling provides improved tuning flexibility. For example, a portion of the microstrip feedline may be used as a tuning stub to provide impedance matching on the feedline.

Other References

I. Park and R. Mittra, "Aperture-Coupled Quarter-Wave Microstrip Antenna," IEEE Antennas and Propagation Society International Symposium 1996, Baltimore, MD., Jul. 21-26, 1996, pp. 14-17
P. Sullivan and D. Schaubert, "Analysis of an Aperture Coupled Microstrip Antenna," IEEE Transactions on Antennas and Propagation, vol. AP-34, No. 8, Aug. 1986, pp. 977-984
K. Hirasawa and M. Haneishi, "Analysis, Design and Measurement of Small and Low-Profile Antennas," Artech House, Norwood, Ma., 1992, Ch. 5, pp. 161-180
I. Park et al., "Aperture-Coupled Small Microstrip Antenna," Electronics Letters, vol. 32, No. 19, pp. 1741-1742, Sep. 12, 1996
K. Takeuchi et al., "Characteristics of a Slot-Coupled Microstrip Antenna Using High-Permittivity Feed Substrate," Electronics and Communications in Japan, Part I--Communications, vol. 78, No. 3, pp. 85-94, Mar. 1995
P. Sullivan et al., "Analysis of an Aperture-Coupled Microstrip Antenna," IEEE Transactions on Antennas and Propagation, vol. 34, No. 8, pp. 977-984, Aug., 1986
K. Kagoshima et al., "Analysis of a Planar Inverted F Antenna Fed By Electromagnetic Coupling," Proc. of the Antennas and Propagation Society International Symposium (APSIS), Chicago, Jul. 20-24, 1992, vol. 3, pp. 1702-170