Dielectric Materials for Wireless Communication

CHAPTER THREE

MICROWAVE DIELECTRIC MATERIALS IN THE BaO–TiO₂ SYSTEM

3.1 INTRODUCTION

Barium titanate compounds in the BaO–TiO₂ system are archetypal electronic ceramics with a long history of technological applications in the ceramic capacitor industry. The Ti-rich region (>50% TiO₂) of the BaO–TiO₂ gives few compositions which exhibit [1–6] good temperature compensation with very good relative permittivity and low dielectric loss at radio frequencies. In 1947, Bunting and co-workers reported [1, 2] a low-loss temperature-compensated composition containing 83.3 mol% TiO₂ with _r = 37 at 1 MHz. In 1958, Jonker and Kwestroo [3] reported a promising ...