Spectrum absorbency of metamaterial perfect absorber

A triple-band metamaterial perfect absorber was introduced. The single and simple structure based on gold-bar shaped was designed on the 0.018λ Taconic TLY-5. The gold-bar shaped was designed horizontal initially was then being rotated anti-clockwise from0oto 90oto analyze and understand the change of absorption graph. Dual-band perfect metamaterial absorber was achieved at 45o. The fundamental and third harmonic magnetic resonances caused the low and high frequency peaks, respectively. Then, the gold-bar shaped was slotted at both end to create triple-band metamaterial perfect absorber. The slotted gold-bar shaped was evaluated in three absorption peaks: 99.94%, 99.88% and 99.66% at 3.98 GHz, 4.81 GHz and 5.33 GHz, respectively. This, however, moved to the 3.96 GHz, 4.80 GHz and 5.33 GHz with absorbency 99.79%, 99.95% and 99.90% for the measured structure. Both simulated and measure results were achieved absorbency over 99%, which was almost perfect absorption (≈100%). These properties are expected to beused in real-world applications such as satellite and radar communications transmission, particularly in lowering radar cross-section for stealth applications

A Review: The Development Of Metamaterial Absorber

A metamaterial is an artificial resonant structure that is designed to obtain specific characteristics which are not naturally occurring in nature. One of the applications is metamaterial absorber, which offers benefits over conventional absorbers. Metamaterials absorber is a structure that attenuates the energy in electromagnetic waves, soak up the incident energy, convert into heat and reduce the energy reflected back to the source. Various designs on metamaterial absorber have been investigated exhibiting different characteristics; single-band, multi-band, as well as broadband. Starting from thick and rigid substrates, followed by a thin and also flexible substrate materials are being considered. Perfect absorbency is achieved when the surface impedance of the structure equal to the free space impedance. Different methods in introducing the loss in an absorber; lumped resistor, resistive pattern and lossy dielectric. These unique characteristics of metamaterial absorber enable wide applications in various technologies

Improvements Of Trapezoid Antenna Gain Using Artificial Magnetic Conductor And Frequency Selective Surface

This paper presents the performance enhancement of the trapezoid antenna with Artificial Magnetic Conductor (AMC) and Frequency Selective Surface (FSS). The antenna, AMC and FSS structures are printed on 0.254 mm of RT/Duroid 5880 high frequency laminate. The performances of the antenna with and without AMC and FSS were evaluated. Three cases are analyzed; antenna alone, antenna with AMC and antenna with AMC-FSS. The 2x3 arrays of AMC and AMC-FSS were positioned at the back of the antenna with 6 mm air gap. The antenna alone works at 12 GHz, and shifted to 12.35 GHz and 12.33 GHz for case 2 and case 3, respectively. Despite the shift in the resonance, the antenna is still operating well at 12 GHz with a return loss -16.70 dB for case 2 and-16.84 dB for case 3. Case 3 effectively enhanced the antenna gain from 4.43 dB to 6.74 dB and contributed to a directive antenna. Moreover, case 3 also successfully reduced the radiation of the antenna that penetrates into human body as the antenna is applied for on-body applications

Application development with J2ME for mobile phone

With mobile commerce technology continuously being taken more into use and introduced in new markets, the transition to mobile commerce (m-commerce) will make mobile shopping exceedingly popular. In the near future mobile shopping will probably replace today's markets or shopping complex. This project presents a mobile application which is built using Mobile Information Device Profile (MIDP) of the Java 2 Platform Micro Edition (J2ME), that enable users to purchase flowers without a trip to the market or elsewhere. Users can access the application or service through mobile phones and view the available items. The application has been deployed and run on an emulator (Wireless Toolkit 2.5 Beta) with a DefaultColorPhone as the default emulator

Wide-Band Metamaterial Perfect Absorber Through Double Arrow Shape Printed On A Thin Dielectric

A wide-band metamaterial perfect absorber was introduced. The dual arrow shapes and the ground plane were in between the 0.0035λ TLY-3. Lump element technique was applied to enhance the absorption bandwidth, which was connected between both of the arrow structures. The limitation during fabrication process in using lump element, had seriously restricted its practical applications for microwave absorption. Then, a very thin line was connected between both arrow structures to represent the resistance by lump element which was expected to ease the fabrication process and practical applications as well. Four cases were analyzed: double arrow, double arrow with lump connected, double arrow with lump connected and 9 mm air gap, and thin line connected with 6 mm air gap. The fourth case achieved the highest operational absorbency frequency, which developed about 7.38 GHz (3.87 GHz to 11.25 GHz) approximately to 7.38 GHz. Three resonant frequencies were achieved; 4.17 GHz, 6.09 GHz and 10.30 GHz with perfect absorbency. These properties are expected to be used in practical applications such as satellite and radar communications transmission. These properties of the metamaterial absorber could increase the functionality of the metamaterial absorber to be used in any application especially in reducing radar cross section for stealth applicatio

Technique To Enhance The Bandwidth Of A Very Thin Artificial Magnetic Condutor (AMC)

This paper introduces a technique to enhance the bandwidth of the Artificial Magnetic Conductor (AMC). A multilayer patch type of Frequency Selective Surface (FSS) is stacked on the AMC structure, to increase the thickness of the overall structure contributing to the lower inductivity consequently the higher the bandwidth. Both AMC and FSS structures were designed by using Rogers RT5880 with the thickness of 0.254 mm and permittivity of 2.2. The bandwidth of the AMC structure is successfully enhanced from 1.97% to 3.79%. The AMC was designed at 12 GHz which can be applied for 5G applications

Design Of Compact Filtenna Based On Capacitor Loaded Square Ring Resonator For Wireless Applications

This paper proposes and demonstrates a compact integrated filtering antenna built on a square ring resonator coupled with a capacitors loaded microstrip line filter. A microstrip filter module is connected to feeding line of the conventional patch without adding extra space. Thus, the combined configuration possesses radiating and filtering functions simultaneously. The proposed filtenna has a fractional bandwidth (FBW) of 3% at center frequency 2.4 GHz with 2.5 dB of maximum gain. The obtained result shows that the proposed design shows good stopband gain rejection, good selectivity at band edges, and smooth passband gain. Furthermore, the introduced filtenna has advantages of a small size and a simple structure, which makes it ideal for interconnection with different wearable devices operating within 2.4 GHz wireless system range

Design of filter integrated SPDT switch using capacitor loaded ring resonator with high isolation

A reconfigurable filter integrated single-pole double-throw (SPDT) switch (FIS) based on capacitor loaded ring resonators is presented in this paper. The design incorporates two PIN diodes between two symmetric square ring resonators. The ring resonators can be switched between all stop and bandpass responses, by adjusting the state of the PIN diodes, allowing the corresponding signal path to be in OFF-state with high isolation or ON-state with bandpass filter response. For demonstration, filtering switch was fabricated and measured for 2.4 GHz applications. The measurement results featured an ON-state low insertion loss of −2.1 dB and port-to-port isolation of −52 dB at the band of interest, and good consistency is achieved between simulated and measured result