ANALISA PENGUKURAN KADAR GLUKOSA DARAH NON-INVASIVE PADA SENSOR BERSTRUKTUR CPW LOADED SQUARE RING RESONATOR WITH INTERDIGITAL COUPLING CAPACITOR

RATMOKO, CATUR (2020) ANALISA PENGUKURAN KADAR GLUKOSA DARAH NON-INVASIVE PADA SENSOR BERSTRUKTUR CPW LOADED SQUARE RING RESONATOR WITH INTERDIGITAL COUPLING CAPACITOR. S2 thesis, Universitas Mercu Buana Jakarta.

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Abstract

This study presents the results of the experimental system used in designing the CPW-based sensor structure in detecting human blood glucose levels, using microwave interaction with digital finger tissue. Sensor with microwave is used for non-invasive monitoring of blood glucose. The sensor design uses a symmetrically loaded CPW structure in the form of a square ring resonator with an interdigital coupling capacitor on the back side of the media (grounded). Simulated together with the load in the form of artificial finger tissue using gelatin as a base material is modeled into four layers, starting with the skin which is the outermost tissue, then fat, blood and bone and each of these tissues also has a certain thickness, skin (0.3mm), fat (0.2 mm), blood (1.5mm) and bone (4mm). Measurements were carried out by simulation using HFSS and fabrication using VNA as a physical representation of the design results with parametric optimization analysis. To verify the correlation and expected sensitivity, media with different dielectrics was mounted on the surface of the sensor resonator with blood glucose levels of 1 mg/dl, 72 mg/dl, 126 mg/dl, 162 mg/dl and 216 mg/dl. Changes in the shift in the reflection factor S11 were observed based on the dielectric constant of blood glucose levels with increasing and decreasing (dB) levels. Analysis of the data on the graph between the independent variables, namely the concentration of blood glucose and the dependent variable level S11 (dB) has a correlation value of R2 of 0.97644. The sensitivity level of the sensor on the reflection factor S11 with an average HFSS simulation reached 73.36 mdB/mgdl-1 and VNA reached 82.39 mdB/mgdl-1 . The results are interesting to develop a more optimal glucose sensing system. Keywords: Sensor; coplanar waveguide; resonator loaded ground structure; square ring resonator with interdigital coupling capacitor; non-invasive; measurement of blood glucose levels. Pada penelitian ini menyajikan hasil dari sistem eksperimental yang digunakan dalam mendesain struktur sensor berbasis CPW dalam mendeteksi kadar glukosa darah manusia, menggunakan interaksi gelombang mikro dengan finger digital tissue. Sensor dengan gelombang mikro digunakan untuk pemantauan glukosa darah secara non-invasif. Desain sensor menggunakan struktur CPW yang dimuat secara simetris berbentuk square ring resonator dengan interdigital coupling capacitor pada sisi belakang media (grounded). Disimulasikan bersama beban berupa jaringan jari buatan menggunakan bahan dasar gelatin dimodelkan menjadi empat lapis, dimulai bagian kulit yang merupakan jaringan terluar, berikutnya adalah lemak, darah dan tulang dan masing-msing jaringan tersebut juga memiliki ketebalan tertentu, kulit (0.3mm), lemak (0.2 mm), darah (1.5mm) dan tulang (4mm). Pengukuran dilakukan secara simulasi menggunakan HFSS dan fabrikasi menggunakan VNA sebagai representasi fisik dari hasil rancangan dengan analisa optimasi parametrik. Untuk memverifikasi korelasi dan sensitifitas yang diharapkan, media dengan dielektrik berbeda dipasasng pada permukaan resonator sensor dengan kadar glukosa darah 1 mg/dl, 72 mg/dl, 126 mg/dl, 162 mg/dl dan 216 mg/dl. Perubahan pergeseran faktor refleksi S11 diamati berdasarkan konstanta dielektrik kadar glukosa darah dengan naik turunnya level dB. Analisa data terhadap grafik antara variabel independen yaitu konsentrasi glukosa darah dan variabel dependen level S11 (dB) mempunyai nilai korelasi R2 sebesar 0.97644. Didapat tingkat sensitifitas sensor pada faktor refleksi S11 dengan rata-rata simulasi HFSS mencapai 73.36 mdB/mgdl-1 dan VNA mencapai 82.39 mdB/mgdl-1 . Hasilnya menarik untuk mengembangkan sistem penginderaan glukosa yang lebih optimal. Kata Kunci: Sensor; coplanar waveguide; resonator loaded ground structure; square ring resonator with interdigital coupling capacitor; non-invasive; measurement of blood glucose levels.

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