Equivalent circuit for the microstrip ring resonator suitable for broadband materials characterisation

Hopkins, R.H.; Free, C.E.

doi:10.1049/iet-map:20070039

Cited by 51 publications

(19 citation statements)

References 11 publications

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“…Depending on the degree in which the electric field extends beyond the ring’s plane, the sapphire substrate below and nitrogen gas above would form an effective dielectric constant, likely frequency dependent171819. Dispersion free behavior requires, at a minimum, transverse electric magnetic (TEM) modes of propagation20; full wave numerical simulation could shed light on the degree of feasibility in TEM modes in our system.…”

Section: Resultsmentioning

confidence: 99%

Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring

Bulmer

Bullard

Dolasinski

et al. 2015

Sci Rep

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An electromagnetic transmitter typically consists of individual components such as a waveguide, antenna, power supply, and an oscillator. In this communication we circumvent complications associated with connecting these individual components and instead combine them into a non-traditional, photonic enabled, compact transmitter device for tunable, ultrawide band (UWB) radiation. This device is a centimeter scale, continuous, thin film superconducting ring supporting a persistent super-current. An ultrafast laser pulse (required) illuminates the ring (either at a point or uniformly around the ring) and perturbs the super-current by the de-pairing and recombination of Cooper pairs. This generates a microwave pulse where both ring and laser pulse geometry dictates the radiated spectrum’s shape. The transmitting device is self contained and completely isolated from conductive components that are observed to interfere with the generated signal. A rich spectrum is observed that extends beyond 30 GHz (equipment limited) and illustrates the complex super-current dynamics bridging optical, THz, and microwave wavelengths.

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Section: Resultsmentioning

confidence: 99%

Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring

Bulmer

Bullard

Dolasinski

et al. 2015

Sci Rep

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“…The ring resonator model consists of a ring and two feed lines pasted on the upper surface of the jeans substrate. The ground plane occupies the lower surface of the jeans substrate, and a small gap Δ is also included between the ring and each feed line [12,13]. The fabricated ring resonator model is shown in Fig.…”

Section: Measurement Of Jeans Textile Characteristicsmentioning

confidence: 99%

Novel Electro-Textile Patch Antenna on Jeans Substrate for Wearable Applications

Ahmed¹,

Ahmed²,

Shaalan³

2018

PIER C

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Abstract-This paper aimed to take closer steps towards real wearability by investigating the possibilities of designing and fabricating highly efficient and fully flexible wearable microstrip patch antenna for operating frequency of 5.8 GHz as a center frequency. Two types of conducting materials have been used for conducting parts: conventional metal plane and woven electro-textile material, while a non-conducting jeans fabric has been used as antenna substrate material. The dielectric constant ε r = 1.78, and loss tangent tan δ = 0.085 of the jeans substrate measured by using two different methods. Also, the electromagnetic properties of the electro-textile are studied in details. The conductivity of etextile cell is equal to 2.5× 10 6 S/m and the surface impedance of e-textile cell equal to 0.0395+ J18.4 Ω. Furthermore, the proposed wearable antenna may be attached to human body, so the specific absorption ratio (SAR) must be calculated. Finally, the proposed design is simulated by CST simulator version 2016, fabricated using folded copper and measured by Agilent8719ES VNA.

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“…Hence the field distribution is TM in the vertical direction (boresight). In the case on annular rings, the primary mode (TM 11 ) has been found to be of high Q whereas the second mode (TM 12 ) is highly preferred for antenna applications [10,13,17]. The reactive loading by corner discontinuities and the transformed Table 5.…”

Section: Length Of Thementioning

confidence: 99%

“…Ring type patches of various shapes have been studied in various contexts [10][11][12][13][14][15][16][17]. If higher order modes are excited, these provide better bandwidth and higher radiation resistance than similar sized regular patch antennas.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Square Ring Antenna for Dual-Band Operation

Behera¹,

Vinoy²

2009

PIER

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Abstract-This paper presents a generalized approach to design an electromagnetically coupled microstrip ring antenna for dual-band operation. By widening two opposite sides of a square ring antenna, its fractional bandwidth at the primary resonance mode can be increased significantly so that it may be used for practical applications. By attaching a stub to the inner edge of the side opposite to the feed arm, some of the losses in electrical length caused by widening can be regained. More importantly, this addition also alters the current distribution on the antenna and directs radiations at the second resonant frequency towards boresight. It has also been observed that for the dual frequency configurations studied, the ratio of the resonant frequencies (f r2 /f r1 ) can range between 1.55 and 2.01. This shows flexibility in designing dual frequency antennas with a desired pair of resonant frequencies.

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Equivalent circuit for the microstrip ring resonator suitable for broadband materials characterisation

Cited by 51 publications

References 11 publications

Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring

Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring

Novel Electro-Textile Patch Antenna on Jeans Substrate for Wearable Applications

Microstrip Square Ring Antenna for Dual-Band Operation

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