EBG Substrate Research Articles

Study on radiation performances of dipole antenna with diamond‐structure EBG substrate fabricated by 3D printing technique

AbstractIn order to improve antenna radiation performances, a dipole antenna with 3D diamond‐structure electromagnetic band‐gap (EBG) substrate is analyzed and its transmission performances are investigated. The diamond‐structure EBG substrate was fabricated with aluminum oxide ceramic by 3D printing technique and sintering process, and its band‐gap measured by a transmission‐reflection method was between 9 and 11.5 GHz, with a maximal loss of −50 dB at 9.9 GHz. The radiation frequency of designed dipole antenna corresponded to the frequency of strongest reflection of the EBGs. Comparison of E‐plane radiation patterns of dipole antenna without substrate, dipole antenna with a common ceramic substrate and dipole antenna with EBGs showed that gain of dipole antenna with EBGs was 3 dB higher than that of dipole antenna with a common ceramic substrate and 5 dB higher than that of dipole antenna without substrate, thus the gain was improved by 3.2 times. Moreover, the radiation pattern of dipole antenna with EBGs was smoother, which showed that EBGs can effectively suppress propagation of surface waves. In addition, the main lobe width was reduced, thus antenna directivity was improved.

Design & Simulationof R Slotted Patch Antenna with EBG Substrates

This paper presents the design and simulation of rectangular& circular with EBG substrate using High Frequency Structure Simulator (HFSS).The two different configurations of broadband microstrip patch antenna, multistackedrectangular patch antenna &multistackedcircular patch antenna are analyzed. Return Loss & Gain are performance parameter. The substrate used in these two configurations is RT Duroid having dielectric constant 2.2.The result calculated is return loss of rectangular patch & circular patch with EBG substrates are -13.98 db & -43.4437 db and gain of rectangular patch &circular patch with EBG substrates are 5.7478 db& 10.4954 db respectively

Design & Simulation of Rectangular & Circular Patch Antenna with Electromagnetic Band Gap Substrates

This paper presents the design and simulation of rectangular & circular patch antenna with Electromagnetic Band Gap Substrates (EBG) substrate using High Frequency Structure Simulator (HFSS). The two different configurations of broadband micro strip patch antenna, multi stacked rectangular patch antenna & multi stacked circular patch antenna are analyzed. Return Loss & Gain are performance parameter. The substrate used in these two configurations is RT Duroid having dielectric constant 2.2. The result calculated is return loss of rectangular patch & circular patch with EBG substrates are -13.98 dB & 43.4437 dB and gain of rectangular patch & circular patch with EBG substrates are 5.7478 dB & 10.4954 dB respectively.

A Compact Configurable EBG Filter on PCB

A novel design for configurable electromagnetic bandgap (CEBG) filter on printed circuit board (PCB) is presented. The CEBG filter is implemented in FR4 substrate with surface mounted lumped capacitors. Working frequency of the filter can be controlled by adjusting the value of the capacitor. The CEBG filter is unique in that it creates resonance by introducing a surface mounted capacitor instead of relying on modification of a periodic lattice in the substrate and in that it can cover large frequency range with a compact size. A particular example of a frequency controllable filter is implemented by CEBG process and experimentally demonstrated on the same EBG substrate and with different lumped capacitors. The results show a filter with a size of $2.50\times 3.00\times 1.00$ mm $^{3}$ in PCB achieving performance of an unloaded quality factor (Qu) of 81, an insertion loss (IL) of 3.48 dB at 3.22 GHz, and a Qu of 105, an IL of 2.93 dB at 4.07 GHz using a capacitor of 3.3 and 2.2 pf, respectively.

Dual-band wearable antennas over EBG substrate

A dual-band coplanar patch antenna integrated with an electromagnetic bandgap substrate is reported. The antenna structure is made from common clothing fabrics and operates at the 2.45 and 5.1–5.8 GHz wireless bands. The bandgap array consists of just 3×3 elements but reduces radiation into the body by over 10 dB and improves the antenna gain by 3 dB.

Elimination of Scan Blindness in Phased Array Antennas Using a Grounded-Dielectric EBG Material

In printed phased arrays, scan blindness occurs when the propagation constant of a Floquet mode coincides with that of a mode supported by the homogeneous substrate, resulting in large input mismatch and in a propagating mode with complex propagation constant. In our study we analyze the possibility to replace a standard homogeneous dielectric substrate with a grounded dielectric EBG substrate to eliminate scan blindness. We present here the main idea for the design, the dispersion diagrams of a dielectric EBG material with metallic patches to show that there are no surface modes (waves guided by the structure with real propagation constant), and the active reflection coefficient and input impedance for various frequencies. Furthermore, at a chosen operating frequency the active reflection coefficient for the phased case indicates that there is no scan blindness effect

Experimental verification of the reduction of coupling between dipole antennas by using a woodpile substrate

In this paper, the mutual coupling between dipole antennas placed on top of a woodpile structure is experimentally investigated. The coupling between dipoles backed by a woodpile substrate is compared with that obtained when the dipole antennas are placed on a dielectric substrate and when they radiate into free space. On average, between 2 and 7 dB reduction of the mutual coupling is achieved with respect to the dielectric substrate case when the woodpile substrate is used. The free space coupling is also reduced in the H-plane configuration case. However, the E-plane coupling slightly increases due to modification of the radiation pattern. Imaging array applications could potentially benefit from the use of EBG substrates due to the improved isolation between pixels.