Study on microwave dielectric properties of corundum type () ceramics for designing a microwave low pass filter

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• 作者：Parthasarathi Mohanty^a ; Sunita Keshri^a ; ^{s_keshri@bitmesra.ac.in" class="auth_mail" title="E-mail the corresponding author} ; ^{sskeshri@rediffmail.com" class="auth_mail" title="E-mail the corresponding author} ; Manish Kumar Sinha^a ; Vibha Rani Gupta^b
• 关键词：Corundum ; Microwave dielectrics ; Temperature coefficient of resonant frequency ; Filter circuit
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：5911-5920
• 全文大小：4577 K

文摘

This paper reports the study of structural, morphological and microwave dielectric properties of mmlsi0022" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0022.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=cb121f438b8f06542d298f7a19c18cb4" title="Click to view the MathML source">(Mg_{1&minus;m>xm>}Co_m>xm>)₄Ta₂O₉mathContainer hidden">mathCode"><math altimg="si0022.gif" overflow="scroll"><mrow><msub><mrow><mo stretchy="true">(mo><mrow><msub><mrow><mi mathvariant="normal">Mgmi>mrow><mrow><mn>1mn><mo>&minus;mo><mrow><mi mathvariant="italic">xmi>mrow>mrow>msub><msub><mrow><mi mathvariant="normal">Comi>mrow><mrow><mi mathvariant="italic">xmi>mrow>msub>mrow><mo stretchy="true">)mo>mrow><mrow><mn>4mn>mrow>msub><msub><mrow><mi mathvariant="normal">Tami>mrow><mrow><mn>2mn>mrow>msub><msub><mrow><mi mathvariant="normal">Omi>mrow><mrow><mn>9mn>mrow>msub>mrow>math> (mmlsi0023" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0023.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=3bee9376721535f6e4d8d783d8b9bbb6" title="Click to view the MathML source">m>xm>=0–0.6mathContainer hidden">mathCode"><math altimg="si0023.gif" overflow="scroll"><mrow><mrow><mi mathvariant="italic">xmi>mrow><mo>=mo><mn>0mn><mo>–mo><mn>0.6mn>mrow>math>) ceramics, sintered at 1300–1400 °C. The grown samples were characterized by means of X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. Microwave dielectric properties of these samples were investigated using the mmlsi0024" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0024.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=5f9d77afd4487b9888adfe202179a174" title="Click to view the MathML source">TE_01δmathContainer hidden">mathCode"><math altimg="si0024.gif" overflow="scroll"><msub><mi>TEmi><mrow><mn>01mn><mi>δmi>mrow>msub>math> dielectric resonator method. Our study shows that the dielectric properties are strongly dependent on the compositions, densification and micro-structure of the specimens. Out of these compositions, mmlsi0025" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0025.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=cf8b960beae2bf1f34fc1c909b733110" title="Click to view the MathML source">(Mg_0.7Co_0.3)₄Ta₂O₉mathContainer hidden">mathCode"><math altimg="si0025.gif" overflow="scroll"><mrow><msub><mrow><mrow><mo>(mo>mrow><msub><mrow><mi>Mgmi>mrow><mrow><mn>0mn><mo>.mo><mn>7mn>mrow>msub><msub><mrow><mi>Comi>mrow><mrow><mn>0mn><mo>.mo><mn>3mn>mrow>msub><mrow><mo>)mo>mrow>mrow><mrow><mn>4mn>mrow>msub><msub><mrow><mi>Tami>mrow><mrow><mn>2mn>mrow>msub><msub><mrow><mi mathvariant="normal">Omi>mrow><mrow><mn>9mn>mrow>msub>mrow>math> shows near zero mmlsi0011" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0011.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=1fb5bc4d2c285b2df13b7e090f85ea30" title="Click to view the MathML source">m>τm>_m>fm>mathContainer hidden">mathCode"><math altimg="si0011.gif" overflow="scroll"><mrow><msub><mrow><mi mathvariant="italic">τmi>mrow><mrow><mi mathvariant="italic">fmi>mrow>msub>mrow>math> with a dielectric constant mmlsi0026" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0026.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=f527ec1fa4b631b1b52960a66bfe263e" title="Click to view the MathML source">ϵ_rmathContainer hidden">mathCode"><math altimg="si0026.gif" overflow="scroll"><msub><mi>ϵmi><mi mathvariant="normal">rmi>msub>math>mmlsi0027" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0027.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=eda006f01831be3478657933a7966182" title="Click to view the MathML source">~mathContainer hidden">mathCode"><math altimg="si0027.gif" overflow="scroll"><mrow><mo>~mo>mrow>math>13.79 and a quality factor mmlsi0028" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0028.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=2f33dd7cfd303b524eb617babd1ee5cc" title="Click to view the MathML source">m>Qfm>mathContainer hidden">mathCode"><math altimg="si0028.gif" overflow="scroll"><mrow><mi mathvariant="italic">Qfmi>mrow>math>mmlsi0027" class="mathmlsrc">mulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215024372&_mathId=si0027.gif&_user=111111111&_pii=S0272884215024372&_rdoc=1&_issn=02728842&md5=eda006f01831be3478657933a7966182" title="Click to view the MathML source">~mathContainer hidden">mathCode"><math altimg="si0027.gif" overflow="scroll"><mrow><mo>~mo>mrow>math>56,876 GHz (measured at 8.93 GHz). On a substrate made up of this ceramic, a low pass filter of 2.6 GHz cut-off was simulated using Sonnet Lite software and then fabricated. The measured results show a reasonably good agreement with the simulated results. This dielectric shows ~68% size reduction as comparison to FR4 substrate for the same filter design.