Design of a miniaturized dual-band antenna for improved directivity using a dielectric-loaded cavity

Abstract

This article proposes the design of a dual-band global positioning system (GPS) antenna using a high-permittivity dielectricloaded cavity. The cavity structure is filled with a dielectric material to miniaturize the size, and its width and depth are adjusted to maximize the front-to-back ratio for high directivity. Dual-band circular polarization characteristics are achieved by placing two radiating polygon loops at the aperture of the cavity, and the loops are electromagnetically coupled to a microstrip line for a coupled feeding network. The proposed antenna is fabricated, and its antenna characteristics are measured in a full anechoic chamber. The results demonstrate that the antenna is suitable for dual-band GPS applications with high bore-sight gain values of 3.4 dBic at 1.2276 GHz and 3.7 dBic at 1.5754 GHz.

Microstructure and broadband dielectric properties of Zn2SiO4 ceramics with nano-sized TiO2 addition

“…Microwave technologies have recently been developed for widespread applications, and dielectric materials play a crucial role in their performances. For example, dielectric materials can miniaturize the size of components (transmitter, receiver, filters) inside of mobile phones, base stations, microwave integrated circuits and ultrahigh-speed wireless LAN [1][2][3][4][5][6]. Great attention had been paid to materials like (Zr, Sn) TiO4 [7,8], BaTi4O9 [9,10] and Ba (Zn1/3, Nb2/3) O3 [11] as they have suitable permittivity values, high quality factors and near-zero temperature coefficient of resonant frequency, which are crucial technical parameters for high performance microwave system and devices.…”

Design of a Coupled Feed Structure With Cavity Walls for Extremely Small Anti-Jamming Arrays

“…Note that the antenna size without the cavity in [17] cannot be further reduced unless a higher dielectric constant is employed. In addition, the conventional role of the cavity structure is to realize the Fabry-Perot effect for increased directivity [18], which is distinguished from our approach. As a result, the aperture size of 0.113λ is achieved for each individual antenna, and the total array aperture including its ground is reduced to 0.4λ at 1.575 GHz.…”

Compact Broadband Circularly Polarized Monopole Antenna for Global Navigation Satellite System (Gnss) Applications

“…In previous studies [2,16], different kinds of circularly polarized (CP) antennas were presented for the GNSS applications. Some of the utilized techniques include using serial feeding network [2], parasitic shorting strips [3], arc-shaped structure array [4], capacitive feeding disks and arc-shaped slots [5], orthogonally located slots [6], a high impedance surface ground under an annular slot patch [7], two radiating polygon loops [8], concentric annular-ring patch [9], dual-feed configuration and 90 • phase shifter feed network [10], incorporating a proximity-coupled feed [11], cross-type traveling wave strip [12], and three stacked layers of rectangular patches [13]. In [14], a GPS reception antenna with small size and low profile was developed for multifunctional handsets by introducing a compact coupled feed network at the corner of the printed-circuit board.…”

“…In [16], a novel dual-band antenna was realized by using a modified annular ring and a square patch for GPS and satellite digital audio radio (SDARS) automotive applications. However, the CP antennas mentioned above were characterized by single operation band [24], large frequency ratio for dual-band antenna [5,6], narrow 3-dB axial-ratio (AR) bandwidth [7,8], complex techniques [9][10][11] or non-planar structure [12,13], respectively.…”