Microwave ring resonator as a novel bio-material moisture sensor

Yogi, Rutambhara; Gangal, S. A.; Aiyer, R. C.; Karekar, R.N.

doi:10.1016/s0925-4005(98)00154-3

Cited by 15 publications

(18 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The filters not showing any resonance due to fresh leaf overlay in the frequency band studied might be due to a large shift toward the low-frequency side. Such large shifts have been observed by Yogi et al [1998], using a thin film ring resonator in the X band. The leaves studied were different and thinner than the ones reported in this work.…”

Section: Effect Of Acalypha (Ac)mentioning

confidence: 57%

See 1 more Smart Citation

Response of thick and thin film λ/2 microstrip rejection filter to leaf moisture

Ghorpade

Puri

2006

Radio Science

View full text Add to dashboard Cite

[1] Thick and thin film l/2 microstrip L section rejection filters in the X and Ku bands have been used to investigate the effect of leaf moisture on their response. The results reported are in the form of a comparative study of the X and Ku band response of the rejection filters. The investigations are aimed at using the overlay technique for studying the effect of leaf moisture changes on the rejection property of the filter. The leaves investigated were Tradescantia (magenta), Pothas Scandens (green), and Acalypha (bicolored red and green). These leaves were chosen because of their differences in thickness, texture, and color or chlorophyll content. The effects in the Ku band are more dramatic than in the X band for high moisture content (fresh leaves). The results show differences in the response of the thick and thin film filters to condition of leaf overlay. The response to moisture content in the dried leaves is almost similar irrespective of type of metallization of the filter, though the thick film filter seems to be more useful in the X band since some differences between 24 hour dried and 48 hour dried leaf overlay are seen.Citation: Ghorpade, R., and V. Puri (2006), Response of thick and thin film l/2 microstrip rejection filter to leaf moisture,

show abstract

Section: Effect Of Acalypha (Ac)mentioning

confidence: 57%

“…The use of the overlay technique [Karekar and Pande, 1976;Puri, 1994] offers further planarization. There are very few reports [Yogi et al, 1998[Yogi et al, , 1999Abegaonkar et al, 1999aAbegaonkar et al, , 1999b on the use of microstripline components to study biomaterials.…”

Section: Introductionmentioning

confidence: 99%

Response of thick and thin film λ/2 microstrip rejection filter to leaf moisture

Ghorpade

Puri

2006

Radio Science

View full text Add to dashboard Cite

show abstract

“…The frequency shift in the resonating frequency with the addition of oils is because of the increase in effective dielectric constant ( eff (f)) in the system [1][2][3]. The sunflower oil has more dielectric constant than coconut oil, as evidenced by the frequency shift.…”

Section: Discussionmentioning

confidence: 99%

“…The miniaturized microwave microstrip ring resonator (MMRR) as a moisture sensor for biomaterials is reported [1][2][3]. MMRR has many advantages over the previously reported moisture sensors such as continuous and nondestructive measurements, low insertion time, accurate measurements in dusty environments [4], measurements unaffected by ionic conductivity [5], easy loading and unloading of samples compared to microwave waveguide cavities [2].…”

Section: Introductionmentioning

confidence: 99%

Novel technique to detect rancidity of oils using microwave microstrip ring resonator

Sofin

Karekar

Aiyer

2002

Micro & Optical Tech Letters

View full text Add to dashboard Cite

The present article presents a novel technique to study the rancidity of oils at microwave frequencies through measurements of microwave dielectric properties of liquids. CaCO3 (chalk) was used as a noninteracting medium (matrix) to hold the liquids within and is used to perturb the microwave microstrip ring resonator (MMRR). The rancidified oils exhibit high dielectric constants, giving higher changes in resonating frequencies. The method is found to be repeatable. Coconut oil (Cocos nucifera), sunflower oil (Helianthus annuus), rancidified coconut oil and rancidified sunflower oil were studied using this technique. The resonant frequency was measured using a scalar network analyzer (SNA, HP 8757C). The method shows noticeable differences in resonating frequency (few tens of MHz) between fresh oil and rancidified oil. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 33: 377–379, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10327

show abstract

“…Later work by Abegaonkar et al [Abegaonkar et al, 1999a] further explored measurements with wheat; [Abegaonkar et al, 1999b] studied the method on chickpeas with similar success. In a slightly different application, leaves were tested for their moisture content [Yogi et al, 1998]. …”

Section: Ring Resonatormentioning

confidence: 99%

Microwave nondestructive evaluation of aircraft radomes

Johnson

View full text Add to dashboard Cite

Microwave ring resonator as a novel bio-material moisture sensor

Cited by 15 publications

References 9 publications

Response of thick and thin film λ/2 microstrip rejection filter to leaf moisture

Response of thick and thin film λ/2 microstrip rejection filter to leaf moisture

Novel technique to detect rancidity of oils using microwave microstrip ring resonator

Microwave nondestructive evaluation of aircraft radomes

Contact Info

Product

Resources

About