A Three-Section Dual-Band Transformer for Frequency-Dependent Complex Load Impedance

2009 ◽  
Vol 19 (10) ◽  
pp. 611-613 ◽  
Author(s):  
Xin Liu ◽  
Yuan'an Liu ◽  
Shulan Li ◽  
Fan Wu ◽  
Yongle Wu
Keyword(s):  
Dual Band ◽  
Load Impedance ◽  
Frequency Dependent ◽  
Complex Load

Design of dual/tri-frequency impedance transformer with ultra-high transforming ratio

2017 ◽  
Vol 9 (10) ◽  
pp. 1951-1960 ◽  
Author(s):  
Rusan Kumar Barik ◽  
S. S. Karthikeyan
Keyword(s):  
Return Loss ◽  
Dual Band ◽  
Transmission Line Theory ◽  
Load Impedance ◽  
Complex Load ◽  
Frequency Matching ◽  
Line Theory ◽  
Band Characteristic ◽  
Frequency Ratios ◽  
Better Than

In this article, the design of a new dual-band impedance transformer with ultra-high transforming ratio (UHTR) is presented. The closed-form expressions are derived analytically using a lossless transmission-line theory. To practically validate the proposed design concept, two examples of dual-band transformer working at smaller and larger frequency ratios are designed for different load impedance of 500, 1000, and 1500 Ω. Finally, three prototypes of dual-band transformer with UHTR are designed, fabricated, and tested. For all these prototypes, different frequency ratios (two operating frequencies can be chosen arbitrarily) are considered. The measured return loss of the prototypes is better than 15 dB at all the operating frequencies. The measured results are matched very closely with the simulated results. This design is then extended to match a complex load at two different frequencies. The multi-band characteristic is obtained by decomposing a shorted stub into a stepped impedance section of the proposed structure. With the necessary derivation and analysis, a tri-frequency matching network is designed for a transforming ratio of 10.

A dual-band rectenna using broadband DRA loaded with slot

2017 ◽  
Vol 10 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Sachin Agrawal ◽  
Manoj Singh Parihar ◽  
Pravin N. Kondekar
Keyword(s):  
Energy Harvesting ◽  
Dielectric Resonator ◽  
Electromagnetic Coupling ◽  
Dual Band ◽  
Impedance Bandwidth ◽  
Dielectric Resonator Antenna ◽  
Load Impedance ◽  
Rf Energy Harvesting ◽  
Rectangular Slot ◽  
Rf Energy

This paper presents a broadband hybrid slot-dielectric resonator antenna for radiofrequency (RF) energy-harvesting application. The antenna geometry consists of a simple pentagon-shaped dielectric resonator antenna (PDRA) excited by a microstrip feed underlying rectangular slot with narrow notch. It is investigated that the bandwidth of the proposed PDRA is improved significantly owing to electromagnetic coupling between feeding slot and the dielectric resonator. The measured results demonstrate that the proposed PDRA achieves an impedance bandwidth of 110.8%, covering the frequency range from 0.86 to 3 GHz in addition of stable radiation pattern with peak gain of 6.8 dBi and more than 90% radiation efficiency throughout the band, showing its suitability for RF energy harvesting application. For this to be feasible, the developed antenna is matched with the rectifier at two public telecommunication bands of GSM-900 and GSM-1800 using a compact dual-band hybrid matching network. The measured result demonstrates that the proposed dual-band rectenna system provides the peak efficiency of 63 and 59% for a load impedance of 4.7 kΩ at 0.9 and 1.8 GHz, respectively.

Antenna Matching at Harmonic Frequencies to Complex Load Impedance

2015 ◽  
Vol 14 ◽  
pp. 535-538 ◽  
Author(s):  
Kimmo Rasilainen ◽  
Janne Ilvonen ◽  
Ville Viikari
Keyword(s):  
Load Impedance ◽  
Complex Load ◽  
Harmonic Frequencies
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