Design of a Compact Quad-Channel Diplexer
-
Jin Xu
Abstract
This paper presents a compact quad-channel diplexer by using two asymmetrical coupling shorted stub loaded stepped-impedance (SSLSIR) dual-band bandpass filters (DB-BPFs) to replace two single-band BPFs in a traditional BPF-based diplexer. Part of its impedance matching circuit is implemented by using a three-element lowpass T-network to acquire the desired phase shift. Detailed design procedures are given to guide the diplexer design. The fabricated quad-channel diplexer occupies a compact circuit area of 0.168λg×0.136λg. High band-to-band isolation and wide stopband performance are achieved. Good agreement is shown between the simulated and measured results.
Acknowledgment
This work was supported in part by the National Natural Science Foundation of China under Grant 61401358, the Fundamental Research Funds for Central Universities under Grant 3102014JCQ01058 and No.30920140122005, and the State Key Laboratory of Millimeter Waves open research program under Grant K201614.
References
[1] J. Xu, Y.-X. Ji, C.-H. Chen, and W. Wu, “Novel slotted stepped-impedance resonator (SSIR) and its application to compact and high performance bandpass filter and diplexer design,” Int. J. RF Microw. CAE, vol. 23, no. 2, pp. 208–216, Mar. 2013.10.1002/mmce.20666Search in Google Scholar
[2] C. J. Galbraith and G. M. Rebeiz, “Higher order cochlea-like channelizing filters,” IEEE Trans. Microw. Theory Tech., vol. 56, pp. 1675–1683, Jul. 2008.10.1109/TMTT.2008.925574Search in Google Scholar
[3] W.-H. Tu and W.-C. Hung, “Microstrip eight-channel diplexer with wide stopband,” IEEE Microw. Wireless Compon. Lett.vol. 24pp. 742–744Nov. 2014.10.1109/LMWC.2014.2348499Search in Google Scholar
[4] H.-W. Wu, S.-H. Huang, Y.-F. Chen, “Design of new quad-channel diplexer with compact circuit size,” IEEE Microw. Wireless Compon. Lett., vol. 23, pp. 240–242, May 2013.10.1109/LMWC.2013.2253314Search in Google Scholar
[5] B.-W. Min and G. M. Rebeiz, “Single-ended and differential Ka-band BiCMOS phased array front-ends,” IEEE J. Solid-State Circuits, vol. 43, pp. 2239–2250, Oct. 2008.10.1109/JSSC.2008.2004336Search in Google Scholar
[6] I. Bahl, Lumped elements for RF and microwave circuits. Boston, MA: Artech House, 2003.Search in Google Scholar
[7] R. J. Cameron, “Advanced coupling matrix synthesis techniques for microwave filters,” IEEE Trans. Microw. Theory Tech., vol. 51, pp. 1–10, Jan. 2003.10.1109/TMTT.2002.806937Search in Google Scholar
©2016 by De Gruyter
Articles in the same Issue
- Frontmatter
- Improved Cross Polarization and Broad Impedance Bandwidth from Simple Single Element Shorted Rectangular Microstrip Patch: Theory and Experiment
- Compact Bandpass Filter Based on Parallel-coupled Lines and Quasi-lumped Structure
- Compact Dual-Band Bandpass Filter Using Stubs Loaded Ring Resonator
- A Low Conversion Loss Eighth Harmonic Mixer with Wide Band-Stop Filters for Low Cost 94 GHz Receiver Front-Ends
- Design of a Compact Quad-Channel Diplexer
- A Low Phase Noise Fully Monolithic 6 GHz Differential Coupled NMOS LC-VCO
- The Interaction of Terahertz Waves and a Dusty Plasma Slab with Epstein Distribution
- Statistical Beamforming for Interference Mitigation in Multi-cell Massive MIMO Systems
- Interference Mitigation Based on Intelligent Location Selection in a Canonical Communication Network
- A Novel Iteration Model for Electromagnetic Scattering from Rough Surfaces
- A Novel Approach to Photonic Generation and Modulation of Ultra-Wideband Pulses
Articles in the same Issue
- Frontmatter
- Improved Cross Polarization and Broad Impedance Bandwidth from Simple Single Element Shorted Rectangular Microstrip Patch: Theory and Experiment
- Compact Bandpass Filter Based on Parallel-coupled Lines and Quasi-lumped Structure
- Compact Dual-Band Bandpass Filter Using Stubs Loaded Ring Resonator
- A Low Conversion Loss Eighth Harmonic Mixer with Wide Band-Stop Filters for Low Cost 94 GHz Receiver Front-Ends
- Design of a Compact Quad-Channel Diplexer
- A Low Phase Noise Fully Monolithic 6 GHz Differential Coupled NMOS LC-VCO
- The Interaction of Terahertz Waves and a Dusty Plasma Slab with Epstein Distribution
- Statistical Beamforming for Interference Mitigation in Multi-cell Massive MIMO Systems
- Interference Mitigation Based on Intelligent Location Selection in a Canonical Communication Network
- A Novel Iteration Model for Electromagnetic Scattering from Rough Surfaces
- A Novel Approach to Photonic Generation and Modulation of Ultra-Wideband Pulses
