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Differential Dual-Frequency Antenna for Wireless Communication
Liping Han,Wenmei Zhang,Guorui Han,Runbo Ma,Li Li 한국전자통신연구원 2008 ETRI Journal Vol.30 No.6
A novel differential dual-frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz.
Design of Balanced Dual-Band Bandpass Filter with Self-Feedback Structure
Xinwei Chen,Guorui Han,Runbo Ma,Jiangrui Gao,Wenmei Zhang 한국전자통신연구원 2009 ETRI Journal Vol.31 No.4
A balanced dual-band bandpass filter based on λ/2 stepped-impedance resonators and open-loop resonators is proposed in this letter. By employing a type of self-feedback structure, an extra transmission zero is introduced near the common-mode resonance frequency, and the common-mode signal is suppressed. The measured results indicate that the filter can operate in 2.46 GHz and 5.6 GHz bands, and the insertion loss is 1.85 dB and 1.9 dB, respectively. Also, better common-mode suppression is achieved.
Design for a Dual-Frequency Antenna-in-Package
Li Li,Liping Han,Guorui Han,Xinwei Chen,Yanfeng Geng,Wenmei Zhang 한국전자통신연구원 2010 ETRI Journal Vol.32 No.4
For an antenna-in-package (AiP), via holes are used to connect the antenna ground and system ground. In this letter, a dual-frequency AiP with a U-slot embedded in the patch is proposed. By properly arranging three via holes under the non-radiating edge, an AiP with two resonant frequencies is realized. Then a U-slot is embedded in the patch to further improve the bandwidth of the AiP. To validate the proposed design, an AiP with the bandwidth of 4.49% at 2.45 GHz and 6.02% at 5.32 GHz is achieved and fabricated. The measured results agree with the simulated results.