A novel measurement technique for amplifier-type active antennas

An, Hongming; Nauwelaers, Bart; Capelle, A.R. Van de; Bosisio, R.G.

doi:10.1109/mwsym.1994.335133

Cited by 17 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This leads to G t = 8.1 dB. With the knowledge of G t it is possible to calculate the noise factor by measuring the noise power density P n referred to 290 K [21]:…”

Section: Active Receive Antennamentioning

confidence: 99%

Design of a Wearable, Low-Cost, Through-Wall Doppler Radar System

Agneessens

Torre

Declercq

et al. 2012

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

A novel, low-cost, low-weight, wearable Doppler radar system composed of textile materials and capable of detecting moving objects behind a barrier is presented. The system operates at 2.35 GHz and is integrable into garments, making it well-suited for usage in difficult to access terrain, such as disaster areas or burning buildings. Wearability is maximized by relying on flexible, low-weight, and breathable materials to manufacture the key parts of the system. The low-complexity Doppler radar system makes use of an array of four textile-transmit antennas to scan the surroundings. The beam emitted by this array is right-hand circularly polarized along all scanning angles and provides a measured gain of 9.2 dBi. At the receiving end, textile materials are used to develop an active wearable receive antenna, with 15.7 dBi gain, 1.1 dB noise figure, left-hand circular polarization, and a 3 dB axial ratio beamwidth larger than 50°. Several measurement setups demonstrate that the onbody system is capable of detecting multiple moving subjects in indoor environments, including through-wall scenarios.

show abstract

“…This leads to G t = 8.1 dB. With the knowledge of G t it is possible to calculate the noise factor by measuring the noise power density P n referred to 290 K [21]:…”

Section: Active Receive Antennamentioning

confidence: 99%

Design of a Wearable, Low-Cost, Through-Wall Doppler Radar System

Agneessens

Torre

Declercq

et al. 2012

International Journal of Antennas and Propagation

View full text Add to dashboard Cite

show abstract

“…A measurement technique similar to that in [24] was adopted, where the gain of the amplifier is extracted by comparing the active antenna gain with the gain of an identical passive antenna and the noise figure is determined based on the active antenna's transducer gain and absolute noise power density at the output referred to 290 K. According to the aforementioned procedure, the results depicted in Fig. 8 were obtained for the off-body measurement, which show a good agreement with the simulated active antenna performance.…”

Section: Design Evaluationmentioning

confidence: 99%

Review of active textile antenna co-design and optimization strategies

Dierck

Declercq

Rogier

2011

2011 IEEE International Conference on RFID-Technologies and Applications

View full text Add to dashboard Cite

Abstract-This paper describes the challenges that arise in active wearable textile antenna design and optimization. After a short introduction, design strategies for two cases with different needs are discussed and examples are given for each design strategy. In the first case, a low-noise amplifier is connected directly to a 2.45 GHz ISM-band antenna by optimizing the antenna impedance to match the low-noise amplifier input impedance for optimal noise performance. In the second case, an aperture-coupled GPS antenna incorporating a discrete 50 Ω hybrid coupler is linked to a low-noise amplifier by means of a matching network to match the 50 Ω hybrid coupler port to the low-noise amplifier impedance for optimal noise performance.

show abstract

“…Compact microstrip antennas are recently getting more attention due to the increasing demand small antennas for personal communication equipments [4,5,10]. Compact operation of microstrip antennas can be obtained by meandering the radiating patch [5].…”

Section: Compact Antenna Designmentioning

confidence: 99%

“…It is clear that single devices will not generate the required power, because of the problem of producing heat from ever decreasing active device feature size [6,10]. Circuit combining quickly becomes inefficient due to high losses in suitable transmission media.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The design and performance analysis of integrated amplifier patch antenna

Kaya

Çömlekçi

2008

Micro & Optical Tech Letters

View full text Add to dashboard Cite

This work presents the design of an active amplifier antenna. Active integrated antennas can be obtained with active components directly connected to the antenna structure. In this article, a novel active integrated single microstrip antenna analysis and its radiation pattern and gain performance is proposed. A high‐efficiency, low noise, and high linear compact amplifier integrated with a microstrip antenna at 1.6 GHz is presented for RF front‐end circuit applications. The design in this study consists of a rectangular microstrip antenna with a pair of parallel slots loaded close to the radiating edge of the patch and three meandering narrow slots embedded in the antenna surface. With the proposed design a size reduction of 34% for the 1.6‐ and 2.6‐GHz resonant frequencies is obtained and the two frequencies have an operation frequency ratio of 1.30. In this design approach, the measured antenna impedance is transformed with matching to the load impedance for maximum efficiency. With the proposed amplifier antenna design, the antenna radiation pattern can be better than an antenna radiation pattern without matching. In addition, it has been shown that compensation significantly improves the return loss matching level. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2732–2736, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23765

show abstract

A novel measurement technique for amplifier-type active antennas

Cited by 17 publications

References 6 publications

Design of a Wearable, Low-Cost, Through-Wall Doppler Radar System

Design of a Wearable, Low-Cost, Through-Wall Doppler Radar System

Review of active textile antenna co-design and optimization strategies

The design and performance analysis of integrated amplifier patch antenna

Contact Info

Product

Resources

About