Badania właściwości materiałów ferroelektrycznych w zakresie mikrofal

• Autorzy: Jaszczyszyn, E. , Szafran, M. , Modelski, J. , Bobryk, E.

Warianty tytułu

EN

Investigation of the ferroelectric materials behaviour in microwave band

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono impulsową metodę do pomiaru parametrów materiałów ceramiczno-polimerowych, przydatnych do zastosowań w zakresie mikrofal. Przeprowadzono także badania kompozytowych warstw ceramiczno-polimerowych zawierających modyfikowany ceramiczny proszek ferroelektryczny typu Ba0.65Sr0.35TiO3 oraz odpowiedni polimer, w którym w sposób dyskretny rozproszone zostały ziarna tego proszku. Otrzymane współczynniki przestrajania skutecznej przenikalności elektrycznej pozwalają stwierdzić, że warstwy takie nadają się do opracowania nowych typów anten oraz podzespołów mikrofalowych.

EN

Pulse method for microwave measurement of the ceramic-polymer materials parameters has been developed. Ceramic-polymer composite substrates with modified ferroelectric powder Ba0.65Sr0.35TiO3 and appropriate polymer (grains of the powder have been sprayed into polymer with specific method) have been also investigated. The powder Ba0.65 Sr0.35TiO3 has been synthesized at the temperature range 1150-1350C/3h and admixture (from 0,5% to 3%) of oxides of nickel or manganese or iron have been added. The ferroelectric powder after being granulated (into grinder) according to desired size (1-5 um) has been utilized in order to obtain ceramic-polymer films. The substrates of the ceramic-polymer composite have been designed such that volume of the ferroelectric powder was from 75% to 97,5%. However, volume of the polymer was at the range from 2,5 to 25%. Thickness of the composite layer has been chosen from 100 to 500 um. The type of the polymer required for obtaining the composite with desired parameters has been also investigated. Main properties of the composite are mechanical resistance and flexibility. They permit to operate easy with obtained substrate and cover conductive plane with it. The polystyrene and polyvinyl butyral are the best among many investigated polymers. The proposed pulse method for microwave measurement of the ceramic-polymer materials parameters is based on measurement of the pulse delay to after pulse passed of the microstrip line fragment. The substrate of the microstrip line is realized with ferroelectric material. Utilizing this pulse method permits to accurately define the pulse delay without matched to microstrip, but it does not permit to assign losses. Because permittivities of the investigated materials are primarily unknown this way might be very useful. Microstrip line can be matched and the losses can be determined by changing pulse magnitudes. Obtained results (e.g. tuning ability coefficient of the effective permittivity) show that ceramic-polymer substrate can be utilized in designing new type of antennas and microwave devices.

Słowa kluczowe

PL

impulsowa metoda pomiaru; ferroelektryki; kompozyty ceramiczno-polimerowe

EN

pulse method measurement; ferroelectric materials; ceramic-polymer composite

• Czasopismo: Kwartalnik Elektroniki i Telekomunikacji
• Rocznik: 2003
• Tom: Vol. 49, z. 2
• Strony: 247-256
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Jaszczyszyn, E.

• Instytut Radioelektroniki, Politechnika Warszawska, ul. Nowowiejska 15/19, 00-665 Warszawa,

autor

Szafran, M.

• Wydział Chemii, Politechnika Warszawska, Noakowskiego 3, 00-664, Warszawa,

autor

Modelski, J.

• Instytut Radioelektroniki, Politechnika Warszawska, ul. Nowowiejska 15/19, 00-665 Warszawa,

autor

Bobryk, E.

• Wydział Chemii, Politechnika Warszawska, Noakowskiego 3, 00-664, Warszawa,

Bibliografia

• 1. J. B. L. Rao, D. P. Palel, V. Krichevsky: Voltage- Controlled Ferroelectric Lens Phased Arrays. IEEE Trans. Antennas and Propagation, 1999, AP-47, nr 3, pp. 458-468.
• 2. V. K. Varadan, D. K. Ghodgaonkar, V. V. Varadan, J. F. Kelly, P. Glikerdas: Ceramic Phase Shifters for Electronically Steerable Antenna Systems. Microwave Journal, 1992, MJ-35, nr 1, pp. 116-127.
• 3. Y. Yashchyshyn, J. Modelski: The Leaky-Wave Antenna With Ferroelectric Substrate. IX Intern. Conf. On Microwaves, Radar and Wireless Communications MIKON'2002, Conference Proceedings, Gdansk (Poland), May 20-22, 2002, pp. 218-221.
• 4. Sengupta, et al.: Ceramic ferroelectric composite material - BSTO-ZrO.sub.2.: USA Patent C04B035/49, January 23, 1996.
• 5. B. York, J. Pond: Ferroelectric Materia is and Microwave Applications. Workshop Notes, 2000 IEEE MTT-S International Microwave Symposium, Boston (USA), 16 June 2000.
• 6. O. V. Vdovychenko, et al: The Dielectric properties Alumina/Polypropylene Materials. International conference „Advanced ceramics for Third Millennium", Kiev (Ukraine), November 5-9, 2001.