Microwave Dielectric Properties of B2O3-Doped Nd(Mg0.4Zn0.1Sn0.5)O3 Ceramics for Application in Inverted-L Monopole Antenna

• Published in: Ferroelectrics. Letters section 2011-01, Vol.38 (1-3), p.31-39
• Main Authors: Wang, Yen-Nien, Chen, Yih-Chien, Yao, Shi-Li, Wu, Chung-Yen, Chen, Ming-De
• Format: Article
• Language: English
• Subjects: 0.1; 0.4; 0.5; Additives; Ceramics; dielectric constant; monopole antenna; Monopole antennas; Nd(Mg; Noise levels; Phase shift; quality factor; Resonant frequencies; Sintering; temperature coefficient of resonant frequency; X-ray diffraction
• ISSN: 0731-5171; 1563-5228
• DOI: 10.1080/07315171.2011.570178

Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics prepared by the conventional solid-state method have been investigated for application in inverted-L monopole antenna. B 2 O 3 was selected as a liquid sintering aid to lower the sintering temperature of Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics. It was found that the X-ray diffraction patterns of the Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics exhibited no significant phase difference with 0.25 and 0.5 wt% B 2 O 3 additive at different sintering temperatures. The maximum values of the dielectric constant and the quality factor (Q × f) can be obtained when the Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 additive were sintered at 1400°C for 4 h. The temperature coefficient of resonant frequency (−65.2 ppm/°C) was measured for Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 additive sintered at 1400°C for 4 h. The measurement result of inverted-L monopole antenna at 3.5 GHz was presented. With this technique, a 32.39% bandwidth (return loss < 10 dB) with a center frequency at approximately 3.55 GHz was successfully achieved.