Compact Diplexer with High Isolation and Wide Stopband Based on SIRs
-
Bo Zhou
,
Xin-Yi Wang
Abstract
A compact microstrip diplexer with a high isolation and improved out-of-band performance is proposed in this paper. The proposed diplexer is based on cascaded-quadruplet (CQ) bandpass filters (BPFs), which is composed of λ/4 stepped-impedance resonators (SIRs). By employing the edge and quasi-lumped coupling topology, a compact diplexer with improved passband selectivity can be achieved. Meanwhile, by appropriately adjusting the impedance and electric length ratios of SIRs, the stopband can be extended to 20 GHz with a rejection level of 10 dB, which is 12.7 times of the fundamental frequency. The predicted results on S parameters are compared with the measured ones and good agreement is achieved.
Funding statement: This work was supported by the National Natural Science Foundation of China (NSFC) under Grant 61301071 and Scientific research project of Shaanxi Provincial Education Department (15JK1335).
References
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Articles in the same Issue
- Frontmatter
- Compact Multi-band Power Dividers Based on Stub Loaded Stepped-Impedance Resonators with Defected Microstrip Structure (SL-SIR-DMS)
- Compact, Harmonic Suppressed Gysel Power Divider with Plain Structure
- Compact Diplexer with High Isolation and Wide Stopband Based on SIRs
- A Quasi-Elliptic Bandpass Filter-Integrated Single-Pole Double-Throw Switch
- Reflection Modeling Based Broadband Matching Network Design
- Radiation Bandwidth Improvement of Electromagnetic Band Gap Cavity Antenna
- Design of Ultra-Wideband Tapered Slot Antenna by Using Binomial Transformer with Corrugation
- A Compact Pentagonal Ring CPW-Fed Zeroth Order Resonating Antenna with Gain Enhancement
- Novel High-Gain Circularly Polarized Lens Antenna Using Single-Layer Transmissive Metasurface
- Eight-Element Antenna Array for LTE 3.4–3.8 GHz Mobile Handset Applications
- The Effect of Direct Lightning Shielding Rod on Lightning Electromagnetic Fields Aboveground
