在品質要提升，成本要下降的企業競爭環境下，如何改善品質，降低成本一直是企業管理上最重要的項目之一。然而品質與成本之間卻又存在著矛盾，要提升品質通常需要花費更多的成本，如何取得最佳平衡點，便成為一道難題。
陶瓷平板天線(Ceramic patch antenna)主要品質特性為天線的共振頻率(Resonator frequency，f0)，因陶瓷材料物理特性、製程能力與客戶規格等因素，其生產成本上有不同之變化，共振頻率變異程度之大小，成為生產成本高低的要素。個案公司即遭遇到因共振頻率變異大，須額外增加特性調整成本，導致生產成本偏高之問題。陶瓷基板材料(Ceramic substrate material)是影響造成共振頻率製程變異優劣的要因，如何評估陶瓷基板材料的優劣，一直是個案公司待解決的問題。
本論文以個案公司25mm×25mm×4mm陶瓷平板天線為研討對象，利用品質損失函數(Quality loss function)之觀念，並考量經濟採購量(Economic order quantity)之因素，建構出陶瓷基板材料之評估選擇模式，分析不同陶瓷基板材料廠商品質成本上之差異，進而取得出最適生產的陶瓷基板材料。
本研究發現，當共振頻率客戶規格為±3MHz時，在不考量經濟採購量條件下，陶瓷平板天線之總合成本以BK20陶瓷基板為最低；在考量經濟採購量條件下，其總合成本以SK20陶瓷基板為最低。

One of the most important items for business administration is to think how to improve quality and how to reduce the cost in nowadays-competitive market. However the statement of quality and cost is contradiction, which means people usually need to spend more cost, as they want to improve quality. Therefore, it would be a tough problem to make a perfect balance between quality and the cost.
Aerial resonator frequency is the main character of ceramic patch antenna. The production costs will depend on some factors such as the natural characteristics of ceramic material, the process capability and the customer standards. The variation of resonator frequency will be the main cause for the prime cost. According to these factors, the sample company would confront the variance inflation, need to add extra characteristics to revise the cost, and the problem of a superior grade of the production cost. Ceramic substrate material is the principal factor to cause pros and cons of the resonator frequency. How to estimate the advantage or the inferiority of ceramic material is always an un-solved problem for the sample company.
The 25mm×25mm×4mm ceramic patch antenna of the sample company is the discussion object in this study. We use the quality loss function concept and measuring the economic order quantity factor to construct the evaluation option models of ceramic substrate material. Analyzing the difference between the diverse ceramic substrate material qualities of vendor to draw out the most suitable ceramic substrate material for output.
According to this investigation, we find that, if we don’t consider the economical purchase quantity, BK20 ceramic substrate will be the lowest total cost of ceramic patch antenna in the resonator frequency specification of ±3MHz; however if we consider the economical purchase quantity, SK20 ceramic substrate will be the lowest total cost of ceramic patch antenna in the resonator frequency specification of ±3MHz.

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