Frequency-Independent Antennas

Mayes, P.

doi:10.1007/978-1-4615-6459-1_9

Cited by 8 publications

(7 citation statements)

References 64 publications

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“…It may also be used for the effective detection of epithelial cancer. It can replace the less invasive or painful imaging system posing no health hazard, unlike X-rays [18]. The atmospheric transmission of the air column extending from the Earth's surface up to a satellite altitude and up to an aircraft altitude is given in Fig.…”

Section: Imagingmentioning

confidence: 99%

A Terahertz/Millimeter-Wave Based Detection and Imaging System Using Antenna-Coupled Microbolometer

Beig

Kumar

Sharma

et al. 2022

J. Phys.: Conf. Ser.

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The Terahertz (THz) region lie in the range 0.1 THz to 10 THz. It can pass easily through fog, smoke, thin walls, and clothes and be focused as a light wave to create images of objects. Terahertz waves are applied in imaging technology, such as safety, navigation, and non-destructive evaluation (NDE) technique used for materials analysis. A microbolometer is a micromachined device to measure the inherent power of incident electromagnetic radiation. The resistance of bolometer is temperature-dependent, and it varies with changes in the temperature of the exposed surface. Bolometric detectors dominate the market due to their affordability and ease of manufacturing. Despite their slow response time, the systems are still actively employed in the research area, aiming at improved terahertz detection. The antenna and bolometer are coupled. The chosen antenna has a resonance at desired frequency leading to the development of fast response time bolometers without compromising the collection area of the bolometer. The system has low cost, easy fabrication, and better isolation. Antenna simulations were conducted to design and optimize the spiral antenna for 1 to 2.5 THz using HFSS (high-frequency structure simulator) simulation software. The antenna simulation results are presented and discussed.

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Section: Imagingmentioning

confidence: 99%

A Terahertz/Millimeter-Wave Based Detection and Imaging System Using Antenna-Coupled Microbolometer

Beig

Kumar

Sharma

et al. 2022

J. Phys.: Conf. Ser.

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“…The microstrip antenna elements in essence are not very directive, presen gain and very small bandwidth. In order to increase the gain, several microstrip e were associated in arrays using a series feeding structure as it allows greater comp Additionally, a log-periodic configuration was applied in the construction of the greatly increase the bandwidth [32].…”

Section: Log Periodic Antenna Arraysmentioning

confidence: 99%

“…Antennas with a log-periodic configuration belong to the class of frequency-independent antennas, which theoretically have no bandwidth limitations [32]. In practice the behavior is not independent of the operating frequency, but rather dependent on the logarithm of the frequency.…”

Section: Log Periodic Antenna Arraysmentioning

confidence: 99%

Compact Ultra-Wideband Series-Feed Microstrip Antenna Arrays for IoT Communications

2021

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Modern communication systems require high bandwidth to meet the needs of the huge number of sensors and the growing amount of data consumed, and an exponential growth is expected in the future with the integration of internet of things networks. Spectrum regions in the millimeter waves have aroused new interests, mainly because of the contiguous bands available to meet these needs. In return, and to combat the high losses of propagation in these frequencies, higher gain antennas are needed. This paper describes the use of a logarithmic architecture in the design of microstrip antenna arrays, creating structures with high gain and ultra-wide bandwidth. Three different solutions are presented with five, seven, and nine elements, reaching about 25%, 30%, and 44% of bandwidth, achieving ultra-wideband behavior, efficient and with a compact structure operating at frequencies in around 28 GHz.

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“…In this case, the antenna behaves as if it has an infinite length, since the current out of the active region is negligible. In other words, truncation of the element sequence at both ends of the antenna does not make a difference compared to the theoretical infinite structure [Rumsey, 1966;Mayes, 1988]. On the other hand, as the active region reaches the ends of the antenna and begins to overflow, the antenna becomes dysfunctional and the frequency independence collapses.…”

Section: Circular-sectoral Arrays Of Lp Antennasmentioning

confidence: 99%

Modeling and synthesis of circular‐sectoral arrays of log‐periodic antennas using multilevel fast multipole algorithm and genetic algorithms

Ergül

Gürel

2007

Radio Science

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[1] Circular-sectoral arrays of log-periodic (LP) antennas are presented for frequencyindependent operation and beam-steering capability. Specifically, nonplanar trapezoidal tooth LP antennas are considered in a circular array configuration, where closely spaced antennas occupy a sector of the circle. Electromagnetic interactions of the array elements, each of which is a complicated LP antenna structure, are rigorously computed with the multilevel fast multipole algorithm (MLFMA). Genetic algorithms (GAs) are also employed in combination with MLFMA for synthesis and design purposes. By optimizing the excitations of the array elements via GAs, beam-steering ability is achieved in addition to the broadband (nearly frequency-independent) characteristics of the designed arrays. Computational results are presented to demonstrate the important properties of LP arrays.Citation: Ergül, Ö ., and L. Gürel (2007), Modeling and synthesis of circular-sectoral arrays of log-periodic antennas using multilevel fast multipole algorithm and genetic algorithms, Radio Sci., 42, RS3018,

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Frequency-Independent Antennas

Cited by 8 publications

References 64 publications

A Terahertz/Millimeter-Wave Based Detection and Imaging System Using Antenna-Coupled Microbolometer

A Terahertz/Millimeter-Wave Based Detection and Imaging System Using Antenna-Coupled Microbolometer

Compact Ultra-Wideband Series-Feed Microstrip Antenna Arrays for IoT Communications

Modeling and synthesis of circular‐sectoral arrays of log‐periodic antennas using multilevel fast multipole algorithm and genetic algorithms

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