Dual-band EBG Research Articles

Stack Dual-band EBG Based Sensor for Dielectric Characterization of Liquids

Stack Dual-band EBG Based Sensor for Dielectric Characterization of Liquids

Dual-band reconfigurable EBG loaded circular patch MIMO antenna using defected ground structure (DGS) and PIN diode integrated branch-lines (BLs)

In this work, a reconfigurable dual-band multiple-input–multiple-output (MIMO) antenna (RDMA) for the fifth generation (5G) 3.5 GHz and industrial, scientific and medical (ISM) 5.2 GHz has been reported. The reported antenna uses the partial ground plane defected ground structure (PGP-DGS) technique and the integration of the pin diode integrated branch lines (BLs) to obtain dual-band operation. Also, the intermediate structure, without DGS operates in wideband to narrowband reconfigurable mode. The operating frequency of the antenna can be tuned to other frequencies by changing the DGS and BLs design attributes. A novel mushroom inspired dual-band electronics bandgap structure is developed and characterized using a dispersion diagram. The proposed EBG is then placed between RDMA to obtain isolation better than −25 dB between closely packed (at λ5G/17.14) antenna elements. The proposed antenna has an acceptable realized gain above 2.5 dBi and a stable end-fire radiation pattern with the main lobe at −45∘.

Two-channel dual-band microwave EBG sensor for simultaneous dielectric detection of liquids

A compact and dual band Electromagnetic band gap structure (EBG) based on microwave sensor is implemented for multi-sensing and simultaneous dielectric characterization of the liquids. Proposed sensor consist of two different size of EBG patch with stack arrangement are electrically coupled with suspended microstrip transmission line operating at industrial, scientific and medical (ISM) bands 2.45 GHz and 5.80 GHz. A two polypropylene (pp) pipe with dielectric constant 2.2 and inner diameter of 4 mm are inserted in the electric field region of EBG patches to carry the liquid under test. The numerically developed sensor models for both bands are experimentally verified through the fabricated sensor for various binary mixture of water and ethanol. The calculated complex permittivities of different samples are with good agreement to reference one.

Compact Embedded Dual Band EBG Structure with Low SAR for Wearable Antenna Application

Compact Embedded Dual Band EBG Structure with Low SAR for Wearable Antenna Application

Novel dual-band EBG structure to reduce mutual coupling of air gap based MIMO antenna for 5G application

A novel variable band gap center frequency and dual band gap stacked electromagnetic band gap (VBS-EBG) structure for multiple input multiple output (MIMO) antenna system used for the fifth-generation (5G) technology is presented in this paper. Proposed VBS-EBG is mathematically analyzed using transmission line model. Variation in band gap center frequency of VBS-EBG is simulated using eigenmode solution of high frequency structure simulator (HFSS) for different air gap and experimentally validated. It is observed from simulated and experimental results that proposed VBS-EBG gives more than 29.2 % and 39.13 % broader variation in first band gap and second band gap center frequency respectively, compared to reported variable band gap center frequency EBG structures. Application of the proposed EBG structure to reduced the mutual coupling of MIMO antenna system is carried out. 16.16 dB and 6.05 dB reduction in mutual coupling is observed at first and second resonance respectively of MIMO antenna with proposed EBG structure.

Wearable planar inverted‐F antenna with stable characteristic and low specific absorption rate

AbstractA dual band PIFA antenna with EBG structure in application to wearable communication system is investigated in this article. The proposed antenna is designed to work at 2.4/5.8 GHz WLAN band by two horizontal radiation units, and then the dual band EBG with two rectangular rings is designed, which is quite a simple structure. The two zero‐reflection phases and band‐gaps of S21<−20 dB are observed in the designed working bands. Both of the measurement and simulation show that the performance of the proposed antenna under bending condition is stable, and by virtue of the EBG structures, several significant characteristics are obtained such as the unidirectional radiation, high gain, and low SAR value, which are necessary for WBAN applications.

Inverse triangular‐shape CPW‐fed antenna loaded with EBG reflector

A new compact dual wideband CPW-fed inverse triangular-shape antenna is presented. The lower and upper bands are widened from 68.76 and 18.33% to 96.23 and 28.7%, respectively, using a triangular patch-trapezoidal ground combination. The antenna performance is further enhanced by backing it with a dual-band uni-planar EBG reflector. The final design has been prototyped and measured. It sufficiently covers the frequency bands 1.5-5.63 GHz and 9.52-13.06 GHz with enhanced gain up to 5.2 dB. The radiation efficiency is improved to approximately 72%.

DIRECTIONAL DUAL-BAND SLOT ANTENNA WITH DUAL-BANDGAP HIGH-IMPEDANCE-SURFACE REFLECTOR

A compact dual-band high-impedance-surface EBG struc- ture is employed as a re∞ector for a dual-band annular-slot antenna. The re∞ector comprises an array of miniaturized EBG cells which uti- lizes square patches augmented by four S-shaped corrugated arms to reduce the resonant frequency of the proposed EBG structure. In or- der to broaden the bandwidth and adjust the frequency ratio for the dual-band EBG structure, a log-periodic spacing between the S-shaped strips is introduced. The combination of microstrip-fed annular slot and EBG re∞ector provides directional properties for both frequency bands with reduced size and low-proflle.