An exact lumped-element equivalent circuit model for transmission-line transformers formed from coupled microstrip lines

2007 ◽  
Vol 49 (12) ◽  
pp. 2983-2988 ◽  
Author(s):  
John Post
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Lumped Element ◽  
Microstrip Lines

Multi-band Monopole Antennas Loaded with Metamaterial TL

Frequenz ◽  
2015 ◽  
Vol 69 (5-6) ◽  
Author(s):  
Zhi-jie Song ◽  
Jian-gang Liang
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
Impedance Matching ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Radiation Patterns ◽  
Archimedean Spiral ◽  
Lumped Element ◽  
Monopole Antennas ◽  
Better Than

AbstractA novel metamaterial transmission line (TL) by loading complementary single Archimedean spiral resonator pair (CSASRP) is investigated and used to design a set of multi-frequency monopole antennas. The particularity is that the CSASRP which features dual-shunt branches in the equivalent circuit model is directly etched in the signal strip. By smartly controlling the element parameters, three antennas are designed and one of them covering UMTS and Bluetooth bands is fabricated and measured. The antenna exhibits impedance matching better than –10 dB and normal monopolar radiation patterns at working bands of 1.9–2.22 and 2.38–2.5 GHz. Moreover, the loaded element also contributes to the radiation, which is the major advantage of this prescription over previous lumped-element loadings. The proposed antenna is also more compact over previous designs.

Resonant Characteristics of Split Ring Resonator and Unit Cell for Periodic Metamaterial Devices

2021 ◽  
Vol 35 (11) ◽  
pp. 1378-1379
Author(s):  
Brinta Chowdhury ◽  
Thisara Walpita ◽  
B. Yang ◽  
A. Eroglu
Keyword(s):  
Equivalent Circuit ◽  
Ring Resonator ◽  
Equivalent Circuit Model ◽  
Split Ring Resonator ◽  
Circuit Model ◽  
Split Ring ◽  
Analytical Formulation ◽  
Lumped Element ◽  
Ring Structures ◽  
Simulation Results

The resonant characteristics of single split ring resonator-based metamaterial devices with single gap are presented using the analytical formulation developed for the lumped element equivalent circuit model. The characteristics of the metamaterial resonators have been investigated for different ring sizes, gap widths and substrate permittivity. Equivalent circuit model is developed for two ring structures. The analytical, and simulation results are compared and verified. The prototype has been then built and measured. It has been observed that all the results agree. The results presented in this paper can be used to develop devices at the THz range that can operate as sensors, antennas or tuning elements.

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