Equivalent circuit of a dipole antenna using frequency-independent lumped elements

Tang, Tao; Tieng, Quang M.; Gunn, M.W.

doi:10.1109/8.210122

Cited by 95 publications

(47 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Antenna equivalent circuits are widely accepted to characterize antenna operation [30][31][32][33][34][35][36]. This part of the study is the continuation of the earlier study in [23] where the impedance dependency on broadband dipole dimensions by using lumped-element equivalents was introduced.…”

Section: Connection Between Real Part Of Impedance and Equivalent's Pmentioning

confidence: 73%

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Tuovinen¹,

Berg²,

Iinatti³

2014

PIER B

View full text Add to dashboard Cite

Abstract-Ultra wideband (UWB) antenna operation close to tissue is examined by using lumpedelement equivalent circuits in the present paper. The impact of tissue within the reactive near-field of the antenna is introduced in terms of efficiency, impedance and matching to 50 Ω. The parasitic components for the series-and parallel-resonant stages of the equivalent models are proposed for taking the impact of tissue into account on the antenna design. The first time the antenna impedance behaviour is presented in terms of capacitance, inductance and resistance as a function of the radiator distance on the tissue surface for UWB antennas. The capacitance was observed to increase with the distance on the tissue surface by achieving the maximum value close to the reactive near-field boundary. The inductance has the maximum on contact the tissue, decreasing strongly with the first millimetres and remaining constant with the higher distance. The maximum value of input resistance was seen to clearly increase with the distance, having the maximum value in the first third of the studied range, descending close to the value in free space at the boundary at the end. The results are achieved by realising electromagnetic simulations for the antennas and comparing the performance with the operation of the equivalent models.

show abstract

Section: Connection Between Real Part Of Impedance and Equivalent's Pmentioning

confidence: 73%

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Tuovinen¹,

Berg²,

Iinatti³

2014

PIER B

View full text Add to dashboard Cite

show abstract

“…These include Hamid's graphical fitting method [8], Long's transmission line method [9], Gerrits's intuitive electrical schematic [10], Rambabu's broadband equivalent circuit consisting of a series resonant circuit and two parallel resonant circuits [11], Nie's accurate numerical modeling [12] and Tang's four-element lumped-parameter equivalent circuit [13]. These models above are physically based and propose several equivalent circuit topologies from the aspect of input impedance or admittance matching.…”

Section: Introductionmentioning

confidence: 99%

An Equivalent Circuit Modeling Method for Ultra-Wideband Antennas

Wang¹,

Li²,

Ran³

2008

PIER

View full text Add to dashboard Cite

Abstract-This paper presents an effective modeling methodology for Ultra-wideband (UWB) antennas. The methodology is based on augmenting an existing narrow-band model with a macro-model while simultaneously perturbing component values of the narrow-band model. The narrow-band model is an empirical-based circuit and the macro-model described by rational functions is determined using data fitting approaches. The perturbation of component values of the narrow-band model is achieved by adjustments in SPICE. This method is demonstrated on the example of a 2.5 cm dipole antenna and a circular disc monopole antenna for UWB systems. Simulation results show that this methodology is effective over a wide bandwidth and suitable for modeling most UWB antennas.

show abstract

“…Even though, some circuit optimization methods are proposed, e.g., in [23,24], the comprehensive method to estimate the initial values for the circuit evaluation has not been provided, according to the best knowledge of authors. Since the single-resonant dipoles are designed to operate at their lowest resonant frequencies, higher-order resonant modes are ignored in equivalents [25]. Based on the antenna impedances acquired from 3D EM-simulations, the determination of the equivalent circuit in Figure 2(a) is started by defining the proper behaviour for input impedance Z in , which is separated for single-resonant circuits according to series and parallel stages as…”

Section: Equivalent Circuits For Single-and Multi-resonant Dipole Antmentioning

confidence: 99%

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Tuovinen¹,

Berg²

2014

PIER

View full text Add to dashboard Cite

Abstract-The present paper considers the connection between complex input impedance and the physical dimensions for planar ultra wideband (UWB) antennas. The first time the effect of both the actual radiator width and length for impedance behaviour is comprehensively presented. Also the effect of feed point dimensions on complex impedance is studied. The investigations involve both UWB single-resonant dipoles to cover bandwidth ≥ 500 MHz and a multi-resonant dipole for the entire Federal Communications Commission's (FCC) frequency band of 3.1-10.6 GHz. Lumped-element equivalent circuits are used identically with 3D antenna simulations in order to observe the corresponding impedance behaviour with the studied antennas. The used equivalent circuits consisting of seriesand parallel-resonant stages are widely accepted in the open literature. The series-resonant circuit of equivalent is observed to have the analogue to the antenna feeding area. The physical dipole dimensions in terms of a length and width are connected to parallel-resonant part, which mainly determines the antenna input impedance. The resistance of a parallel-resonant stage behaves as the maximum value of real part of dipole impedance with an influence on bandwidth together with the ratio of parallel capacitance C and inductance L. The increase of the antenna physical width has an effect on bandwidth, because of the wider the antenna, the higher the capacitance in the antenna feed. Since the traditional dipoles are used for these studies, the results can be extended in several ways for other antenna types or, for instance, to verify the effect of body tissue, close to a wearable antenna.

show abstract

Equivalent circuit of a dipole antenna using frequency-independent lumped elements

Cited by 95 publications

References 2 publications

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

Analysis of the Impedance Behaviour for Broadband Dipoles in Proximity of a Body Tissue: Approach by Using Antenna Equivalent Circuits

An Equivalent Circuit Modeling Method for Ultra-Wideband Antennas

Impedance Dependency on Planar Broadband Dipole Dimensions: An Examination With Antenna Equivalent Circuits

Contact Info

Product

Resources

About