Çift Bantlı RF Enerji Hasadı İçin Toplu Eleman Devre Yapıları

Yıl 2021, Sayı: 28, 670 - 674, 30.11.2021

Filiz Sarı

https://doi.org/10.31590/ejosat.1010030

Öz

RF enerji hasadı, ortamda bulunan elektromagnetik sinyalleri kullanarak DC enerji üretmektedir. Günümüzde elde edilen enerjiyi arttırmak amacıyla çoklu frekansta RF enerji hasadı çalışmaları yapılmaktadır. Bu çalışmada, çift bantlı RF enerji hasadı için tek empedans uyumlama yapısı ve her bir frekans için ayrı ayrı L tipi empedans uyumlama yapısı çıkış voltaj ve verimleri göz önüne alınarak karşılaştırılmıştır. Simülasyonu yapılan frekans bantları ortamda bulunma yoğunluğu yüksek olan GSM 900 ve GSM 1800 bantlarıdır, bu nedenle 900 MHz ve 1800 MHz frekansları kullanılmıştır ve gerilim çoklayıcı olarak iki kademe Dickson gerilim çoklayıcı seçilmiştir. Çoklu bant empedans dönüştürücü için indüktör ve kapasitörlerden oluşan toplu eleman devre yapıları seçilmiştir. Böylece empedans uyumlama devresi çift bantta yükten kaynağa olan yansımaları bastırmıştır ve maksimum güç transferi sağlanmıştır. Bu yapı için maksimum verimler 900 MHz, 1800 MHz ve çift bant (900&1800 MHz) için sırasıyla 41.947 %, 29.259 %, ve 74.427 % olarak bulunmuştur.

Anahtar Kelimeler

RF enerji hasadı, GSM bandı, Dickson gerilim çoklayıcı, empedans uyumlama, toplu eleman devreler.

Lumped Element Circuit Structures for Dual-band RF Energy Harvesting

Öz

RF energy harvesting generates DC energy using electromagnetic signals in the environment. Today, multi-frequency RF energy harvesting studies are carried out to increase the energy obtained. In this study, single impedance matching structure for dual band RF energy harvesting and L type impedance matching structure for each frequency are compared considering output voltage and efficiency. The simulated frequency bands are the GSM 900 and GSM 1800 bands, which have a high presence in the environment, so 900 MHz and 1800 MHz frequencies are used and two-stage Dickson voltage multiplier is chosen as the voltage multiplier.Lumped element circuit structures consisting of inductors and capacitors are selected for the multiband impedance converter. Thus, the impedance matching circuit suppress the reflections from the load to the source in the dual band and maximum power transfer was achieved. The maximum efficiencies for this structure are found to be 41.947%, 29.259% and 74.427% for the 900 MHz, 1800 MHz and dual bands (900 & 1800 MHz), respectively.

Anahtar Kelimeler

RF energy harvesting, GSM band, Dickson Voltage multiplier, impedance matching, lumped elements.

Kaynakça

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