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Bandpass Class-F Power Amplifier Based on Multifunction Hybrid Cavity–Microstrip Filter
- Source :
- IEEE Transactions on Circuits and Systems II: Express Briefs. 64:742-746
- Publication Year :
- 2017
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2017.
-
Abstract
- This brief presents a filter-integrated high-efficiency class-F power amplifier (PA). The hybrid cavity–microstrip filtering circuit is employed not only to realize output impedance matching and the third-harmonic manipulation but also to provide high-selectivity bandpass responses. To fulfill the requirements of high-efficiency class-F PAs, cavity resonators and microstrip feeding structures are involved, and their benefits are fully exploited. The metal cavity resonator features a high $Q$ value and, thus, low loss in the passband, resulting in high efficiency. Moreover, metal walls of cavities act as heat sink for the transistor. The microstrip feeding structures are used to improve the skirt selectivity and manipulate the third harmonic. Moreover, it features easy integration with the transistor, and thus, the transition between cavity and microstrip lines is eliminated. The hybrid filter is characterized based on filter synthesis theory. Complex impedance conversion analysis is carried out to guide the impedance transformation from 50 $\Omega$ to a complex one desired by the transistor. For demonstration, a filtering PA operating at 2.4 GHz is designed and measured. It exhibits both high-selectivity bandpass responses and good PA performance with maximum power-added efficiency of 70.9% at 40.8-dBm output power.
- Subjects :
- Engineering
Waveguide filter
business.industry
020208 electrical & electronic engineering
Electronic filter topology
RF power amplifier
Impedance matching
020206 networking & telecommunications
Quarter-wave impedance transformer
02 engineering and technology
Microstrip
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Output impedance
Electrical and Electronic Engineering
business
Sallen–Key topology
Subjects
Details
- ISSN :
- 15583791 and 15497747
- Volume :
- 64
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Circuits and Systems II: Express Briefs
- Accession number :
- edsair.doi...........d8101210d3cdb614f3fe49544f873ef0