Circular‐slotted microstrip antenna for GPS

Abstract

To meet the required precision and reliability for global positioning systems, a probe-feed dual-band circularly polarized (CP) microstrip antenna is proposed. This new microstrip antenna design uses a circular patch that is printed on a two-layer substrate consisting of an FR4 dielectric layer and a foam layer, and cutting a crossed-slot and an open ring-slot in the circular patch. When compared with the conventional dual-band CP antenna with two patches among substrate materials, not only is the performance of the antenna improved but also its fabrication becomes easier. The simulated and measured results indicate the validity of the design.

Comparison of different feeding techniques of a low-profile dual-band circularly polarized microstrip antenna

“…2 and Fig. 3, which is based on the study and the development seen in [3], [13] and [14], respectively. The concept behind this design was studied by many researchers, such as A. Heidari [15] and W. Liao [16], who produced two microstrip GPS antennas in rectangular and circular form with slots on the edges in order to enable dual band operation.…”

“…In general, the CP microstrip antennas are classified as antenna structures that are single fed, dual fed or multi-fed, depending on the number of feeding points used to generate the CP waves. An example presented in [3] proposes a single feed dual-band antenna with crossed slots inserted at the center of the radiating element, resulting in circular polarization. To achieve a good axial quality ratio versus the scanning angle, the use of two or four feed probes with phases arranged as 0°, 90°, 180° and 270° becomes necessary in order to suppress the cross-polarization level.…”

“…The most common way is the use of two or more patches printed on several stacked substrate layers [4], [7]- [10]. Another method involves inserting slots in the antenna structure, which results in a single dual-band radiating element [3]. In [11], two stacked patches have been used on an FR4 substrate to achieve a dual-band (1.227GHz and 1.575GHz) GPS system.…”

Compact Dual-Band Circularly Polarized Stacked Patch Antenna for Microwave-Radio-Frequency Identification Multiple-Input-Multiple-Output Application

“…So far, kinds of dual-band circularly polarized (CP) solutions have been proposed. Most of them are achieved by employing corner-chamfered stacking square patches [5][6][7] or slot-loading patches [8]. In [9], two concentric ring radiating elements were excited with coupling apertures and exhibited a general area of λ/2 × λ/ 2 × λ/40.…”

Compact Four-Port Dual-Sense Circularly Polarized Stack-Up Patch Antenna for UHF/MW-RFID MIMO System

“…Compared with LP antenna, CP antenna is more proper for RFID application due to its superiorities, such as detecting insensitivity of the physical orientations and reduced multipath fading. Some dual-band CP designs have been proposed, and most of them employed corner-truncated stack-up configurations [5][6][7] or slot-coupling structures [8,9]. In [10], a pair of concentric ring antenna elements are activated with apertures for CP radiation and occupies the whole area of 0.5λ × 0.5λ.…”