Eliyana Ruslan

Design of wide-band bandpass filter with tunable notch response of wireless communication system

This paper presents design of wide-band bandpass filter with tunable notch response of wireless communication system. This project is to design a five order tunable band-pass filter by using optimum distributed high-pass integrated with Defected Micro-strip Structure (DMS). The wideband frequency is used from 3.1 GHz to 10.6 GHz. The insertion loss and return loss of this project is set to better than 0.5 dB and 20 dB respectively. The DMS is implemented and design after the design of the band-pass filter to remove undesired frequency in wireless communication system. The pin diode is added to act as a switch to tuning the notch response. When the pin diode off, the notch response need to produce a sharp response at 6.8 GHz (RFID) and 8 GHz (X-band satellite communication). When the pin diode on, the notch response is tuned to 4 GHz (C-band satellite communication) with a 400 MHz bandwidth characteristic and a sharp response 6.8 GHz (RFID). All the band reject response must be better than 20 dB. This design is simulated by ADS software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508 mm and loss tangent 0.0019.

High-Q Sensor Based on Symmetrical Split Ring Resonator With Spurlines for Solids Material Detection

This paper presents novel structures of planar microwave sensors for detecting and characterizing the dielectric properties in common solid materials which produce high Q-factors with capability to suppress undesired harmonic spurious. These sensors are based on novel planar symmetrical split ring resonator with spurlines filters by employing the perturbation theory, in which the dielectric properties of the resonator affect the Q-factor and resonance frequency. The proposed sensors achieve narrow resonance with low insertion loss and high-Q and sensitivity which peaked up to 652 at 2.22 GHz operating frequency. By using a specific experimental methodology, practical materials are applied as standards (Roger 5880, Roger 4350, FR4) to validate the sensitivity of the sensors for permitting potentially material characterization and detection. Accordingly, the mathematical equation is derived to extract the materials with unknown properties. The average accuracy percentage of the measured results for all cases of the designed sensors is found within 97%–98% compared with those in the literature for the same tested standard materials. It is believed that these sensors would lead for a promising solution of characterizing material particularly in determining material properties and quality, such as in food industry, bio-sensing medicine applications, and therapeutics goods detections.

Microwave bio-sensor based on symmetrical split ring resonator with spurline filters for therapeutic goods detection

A novel symmetrical split ring resonator (SSRR) based microwave sensor with spurline filters for detecting and characterizing the properties of solid materials has been developed. Due to the weak perturbation in the interaction of material under test (MUT) and planar microwave sensor, spurline filters were embedded to the SSRR microwave sensor which effectively enhanced Q-factor with suppressing the undesired harmonic frequency. The spurline filter structures force the presented sensor to resonate at a fundamental frequency of 2.2 GHz with the capabilities of suppressing rejected harmonic frequency and miniaturization in circuit size. A wide bandwidth rejection is achieved by using double spurlines filters with high Q-factor achievement (up to 652.94) compared to single spurline filter. The new SSRR sensor with spurline filters displayed desired properties such as high sensitivity, accuracy, and performance with a 1.3% typical percentage error in the measurement results. Furthermore, the sensor has been successfully applied for detecting and characterizing solid materials (such as Roger 5880, Roger 4350, and FR4) and evidently demonstrated that it can suppress the harmonic frequency effectively. This novel design with harmonic suppression is useful for various applications such as food industry (meat, fruit, vegetables), biological medicine (derived from proteins and other substances produced by the body), and Therapeutic goods (antiseptics, vitamins, anti-psychotics, and other medicines).

Design of double ring resonator (DRR) for material properties measurement

In this paper, a new topology of microwave resonant sensor (MRS) using 1 GHz microstrip double ring resonator (DRR) is presented for measurement of biological tissues such as chicken, beef and fish. This design is based on electromagnetic simulation in terms of resonant frequency, quality factor and permittivity. The sample is placed on the DRR in order to measure its properties. Any change in the sample permittivity leads to change in the resonance frequency. Results from this study show that the Q-factor of the resonant decreases when the DRR with overlay sample of meat; however, the frequency shift increases when the thickness of the sample increases. Material properties measurement provides useful information that can be used to improve the processing, design, control and quality of product.

Microstrip planar resonator sensors for accurate dielectric measurement of microfluidic solutions

This paper presents a microstrip planar resonator sensors for accurate dielectric measurement of microfluidic solutions based on split ring resonator approach. A potential technique for characterization of solvents with the microvolume of samples has been investigated. The proposed design structures are focusing on a high Q-factor (≥400) which operates at 2.0 and 2.2 GHz. The characterization principle technique is based on a resonant perturbation method due to the shifting of resonant frequency response and maximum electric fields distribution. This variation has been estimated analytically to extract the permittivity of aqueous solutions. Besides, a comparison of sensitivity performance between proposed resonator sensors and conventional resonator sensors is presented. The sensor has a simple structure, easy to fabricate, and has a low cost of the manufacturing process which may be applied to beverages industry application for halal authentication purpose. The technique offers opportunities for further research on sample condition factor towards dielectric response.

Investigation of symmetrical split ring resonator (SSRR) couplings for high sensitivity material characterization

In this paper an investigation of enhanced coupled methods based on planar symmetrical split ring resonator (SSRR) is presented for characterizing the properties of materials. The designed SSRR sensor demonstrates significant improvement in resonant frequency and reflection coefficients when the coupling gap between the feedlines and rings of the sensors is enhanced. The simulated results show that the SSRR achieves narrow resonance with higher Q value of 407. The SSRR sensor can be used for bio -sensing, food industry, quality control, and medicine and pharmacy applications. Experimentally, there is a good agreement in the results of simulation and measurement with possibility of 1.4 % typical error in shifting of the resonance frequency.

Harmonic suppression of symmetrical split ring resonator using double spurlines

In this paper, a new structure of planar microwave sensor for determining and characterizing dielectric materials in common solids is proposed as the appropriate technique to produce high Q-factor with harmonic suppression using double spurlines filter. The proposed sensor is based on new metamaterial symmetrical split ring resonator (SSRR) structure by employing spurline filter for circuit size miniaturization and harmonic suppression. The spurline filter structure forces the proposed resonator to resonate at the fundamental mode which is 2.2 GHz. The double spurlines provide a wider rejection bandwidth compared to the single spurline. The simulated results of the transmission coefficient are in a good agreement with the calculations. It is evidently demonstrated that the proposed ring resonator with double spurlines filter can effectively suppress the harmonic in the ring resonator. The proposed design with harmonic suppression is useful for various applications such as food industry, bio-sensing, medicine, pharmacy and quality control.

Microwave fluidic sensor using enhanced coupling peripheral Microstrip split-ring resonator sensor

In this paper, a new type of microwave fluidic sensor using enhanced coupling peripheral microstrip split-ring resonator is studied in order to analyze the effect of Q-factor and insertion loss with several common liquids. The technique is based on perturbation theory, in which the resonant frequency and Q-factor of the microwave resonator depend on the dielectric properties of the resonator. A Microstrip split-ring resonator with two gaps is implemented for the design of the sensors. Several types of solvents are tested with quartz capillary to verify the sensor performance by simulation. At 2.4 GHz, the split-ring resonator demonstrates significant changes in resonant frequency. Finally, a comparison between previous research works is performed in order to evaluate the effectiveness of resonator sensors for the development of material characterization industry.

Tunable notch response for ultra wide-band bandpass filter

A design of ultra wide-band microstrip bandpass filter with tunable notch response of wireless communication system is presented in this paper. The five order bandpass filter is designed using optimum distributed highpass integrated with Defected Microstrip Structure (DMS). The bandpass filter was designed at wideband frequency from 3.1GHz to 10.6GHz. The insertion loss and return loss of this project is set to better than 0.5dB and 20dB respectively. The DMS is implemented in this design in order to remove undesired frequency in wireless communication system. The pin diode is added to act as a switch to tuning the notch response. When the pin diode off, the notch response produce a sharp response at 5.906GHz (WLAN). When the pin diode on, the notch response is removed from the passband and provide full UWB passband. This design is simulated by ADS software and using Roger Duroid 4350B with a dielectric constant of 3.48, substrate thickness 0.508mm and loss tangent 0.0019.