Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
1999-11-23
2001-04-03
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S749000, C343S830000
Reexamination Certificate
active
06211825
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority benefit of Taiwan application serial no. 88115160, filed Sep. 3, 1999, the full disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a microstrip antenna, and more particularly, to a dual-notch loaded microstrip antenna for dual-band or multi-band applications, wherein the dual-notch loaded microstrip antenna of the invention.
2. Description of Related Art
The dual-band signal-layer microstrip antenna has been widely used in applications like radar and communication systems, because of its advantages over a conventional antenna, such as lighter weight, lower profile and lower cost.
Generally, dual-band single-layer microstrip antennas can be categorized into categories include stub-type microstrip antenna, notch-type microstrip antenna, pin-and-capacitor-type microstrip antenna, and slot-loaded-type microstrip antenna.
As referring to
FIG. 1
, the top view of a conventional slot-type microstrip antenna disclosed in the U.S. Pat. No. 4,692,769, “Dual-band Slotted Microstrip Antenna”, is shown. The slot-type microstrip antenna in
FIG. 1
contains a slot
44
, which stimulates the signals of some lower orthogonal modes and then emits the signals to achieve the dual-band function. Due to the slot and feeding structure shown in
FIG. 1
, two orthogonal lower-mode emissions are created, and the polarization direction of the antenna is 90 degrees.
Referring to
FIGS. 2A and 2B
, the top view and cross-sectional view of a conventional multi-band microstrip antenna are illustrated respectively, wherein the multi-band microstrip antenna has been disclosed in U.S. Pat. No. 5,329,378, “Multi-band Microstrip Antenna”. For such a microstrip antenna, the achievement of emitting multi-band signals is carried out by partially hollowing out cavities in the single-layer substrate, or assembling cut media of different properties into a single layer substrate. However, not only the complicated fabrication process itself increases the fabrication cost, any minor misplacement of parts in assembly process or misalignment occurring in cutting process would seriously degrade the performance of the antenna.
Referring to
FIGS. 3A and 3B
, the top view and cross-sectional view of a multilayer dual-band microstrip antenna are illustrated respectively, wherein the multilayer dual-band microstrip antenna has been disclosed in U.S. Pat. No. 5,561,435 “Planar Lower Cost Multilayer Dual-band Microstrip Antenna”. The dual-band microstrip antenna shown in
FIGS. 3A and 3B
consists of two stacked substrates, each of them contains a metal layer of various dimension. The dimensions of metal layers over substrates are defined correspondingly to the designated resonant frequencies. However, since the fabrication process of the foregoing dual-band microstrip antenna involves stacking two substrates, therefore, the fabrication cost is increased. In addition, shifting and defective coupling occurring in the stacking process also badly affect the performance and stability of the antenna.
In accordance with the foregoing, a microstrip antenna fabricated through a low-cost, efficient, and high-tolerance fabrication process is needed.
SUMMARY OF THE INVENTION
Therefore, the invention provides a dual-notch loaded microstrip antenna including a single-layer and single-medium substrate, a metal layer, and a microstrip layer, wherein the microstrip layer of the microstrip antenna of the invention is etched into a double dual-notch or signal dual-notch structure. The microstrip layer and the metal layer adhere respectively to opposite sides of the single-layer substrate, wherein the metal layer works as the electrical ground. The single-layer substrate contains a penetrating opening whose diameter and location are predetermined. The task of transmitting and receiving dual-band or multi-band signals is carried out by feeding the microstrip layer with signals through the penetrating opening.
In accordance with the foregoing, the dual-notched loaded microstrip antenna of the invention contains only one single-layer, single-medium substrate and a penetrating opening located thereon. Therefore, defects caused by misplacement, misalignment and shifting can be effectively avoided to improve the performance and stability of the antenna. Additionally, the simplified fabrication process can also lower the fabrication cost.
REFERENCES:
patent: 5216430 (1993-06-01), Rahm et al.
patent: 5410323 (1995-04-01), Kuroda
patent: 5646634 (1997-07-01), Bokhari et al.
Huang Jiawei
Industrial Technology Research Institute
J C Patents
Phan Tho
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