Abstract
A high performance balun bandpass fllter (BPF) with very simple structure is proposed in this letter, this structure realizes superior performance in bandpass flltering meanwhile with good difierential performance of the balun. The proper balanced outputs and BPF characteristic by the symmetric feeding and skew-symmetric feeding have been obtained, and the theory of this simple structure for unbalanced input to balanced outputs has been studied. The center frequency of the fabricated balun-BPF was operated at 2.4GHz with 5.8% fractional bandwidth (FBW), and this frequency is used for Bluetooth and some other communication systems. The difierences between the two outputs are 180 - § 5 - in phase and within 0.39dB in magnitude. At f0, the amplitude imbalanced and phase difierence are within 0.37dB and 179.2 - , respectively. The measured frequency responses agree well with the simulated ones. With the theoretical analyses and practical results, it is shown that the proposed one has the advantages of simple structure, convenient analysis and good performance of both BPF and balun.
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