A Dual-Band Dual-Output Filtering Power Amplifier Based on High-Selectivity Filtering Impedance Transformer

Table 2

Comparison of filtering impedance transformers.

Ref.	Termination impedance	TZs	TPs		FBWs (%)	CL num.	Stub num.
[3]	High	4	2	4/6/8/10	NA/NA/7.3^a/NA	1	1
[4]	High	4	3	8/10/12	NA/19^b/NA	2	1
[5]	Low	6	3	5/10	19.85^b/7.96^b	1	2
[7]	Low/high	4	2	25/71.43	5.065^a/3.25^a	1	1
[9]	Low	4	3	2/5/10	22^a/22^a/22^a	2	1
This work	High	4	2	2/4/6	8.2^a/12.2^a/16.3^a	2	2

Two FITs are designed. ^a20 dB RL. ^b dB. The CLs used to realize impedance transformation and the CLs used as stubs are not concluded.