In general, Micropower Impulse Radar (MIR) depends on Ultra-Wideband (UWB) transmission systems. UWB technology can supply innovative new systems and products that have an obvious value for radar and communications uses. Important applications include bridge-deck inspection systems, ground penetrating radar, mine detection, and precise distance resolution for such things as liquid level measurement. Most of these UWB inspection and measurement methods have some unique qualities, which need to be pursued. Therefore, in considering changes to Part 15 the FCC needs to take into account the unique features of UWB technology. MIR is applicable to two general types of UWB systems: radar systems and communications systems. Currently LLNL and its licensees are focusing on radar or radar type systems. LLNL is evaluating MIR for specialized communication systems. MIR is a relatively low power technology. Therefore, MIR systems seem to have a low potential for causing harmful interference to other users of the spectrum since the transmitted signal is spread over a wide bandwidth, which results in a relatively low spectral power density.

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Response to FCC 98-208 notice of inquiry in the matter of revision of part 15 of the commission's rules regarding ultra-wideband transmission systems

Ultra Wideband Signals and Systems in Communication Engineering

http://ieeexplore.ieee.org/iel5/5/31324/01456901.pdf

Microelectronic circuits

IEEE Antennas and Wireless Propagation Letters

https://gut.bmj.com/content/gutjnl/58/12/1680.full.pdf

Recent advances in autoimmune pancreatitis

This paper presents a technique of frequency reconfigurable microstrip patch antenna for S-band applications. The proposed antenna is using the DGS technique which uses three PIN diodes with three rectangular slots. These slot are cut in the ground to produces eight reconfigurable different frequency bands. The proposed antenna designed on FR-4 substrate with dielectric constant 4.1 and thickness 1.5mm. The simulation of the proposed work is conducted with CST. In the proposed design, radiation pattern and directivity at different frequencies are obtained. The simulated return loss is greater than 10 dB for all the bands at different frequencies.

Design frequency reconfigurable microstrip patch antenna for S-band applications

A compact Ultra Wide Band (UWB) antenna with coplanar waveguide feed has been designed and results are verified in this paper. The antenna has been designed on FR4 substrate with dielectric constant (εr) of 4.4 and dimensions of 32mm x 26mm x 0.8mm. The presented antenna shows return loss characteristics in the band of 3.1 to 10.6 GHz as prescribed by FCC, USA. Parametric studies have been done and results thus obtained have been presented. Simulated results have been verified on Rohde & Swartz VNA. The measured results are in good agreement with simulated results which make the presented antenna suitable to be used for wearable applications. Performance analysis of antenna has also been shown in the presence of three layered Human Arm model. Results obtained in presence of Human Arm model has been compared with that in free space. Keywords—CPW feed, Human Arm model, UWB, wearable antenna.

Analysis of Design Structuring and Performance of CPW Fed UWB Antenna in Presence of Human Arm Model

This paper presents a novel circular microstrip-fed antenna design targeting the UWB applications. The proposed antenna yields an impedance bandwidth of 3.1–10.6 GHz with VSWR &#60; 2. More importantly, time domain and frequency domain measurements on the antenna have been used to estimate short-range UWB signal transmission, propagation, and reception, and reveal some properties of this class of antennas, which are not recognized.

http://ieeexplore.ieee.org/iel5/5720567/5728161/05728369.pdf

A new circular UWB microstrip antenna, and its characterization in time and frequency domains

In this article, design and electrical analysis of UWB filter with a notch band is presented. Initially basic UWB filter is designed by using parallel coupled microstrip line with rectangular shaped defective ground plane. Then, to achieve band notch characteristics to eliminate satellite signal at 6.25 GHz, a quarter wavelength open circuit stub is connected with feed line of basic filter. To validate the design theory, a microstrip line UWB BPF with single notch band is designed, and fabricated. The electrical analysis of this filter is also proposed in this paper. The comparison among the results, in the simulated frequency response, measured VNA results and electrical model response shows close agreement. This filter compact in size approximately (17 mm × 8.5 mm). The filter is design by using microwave substrate GML 1000 of dielectric constant 3.2 of height 30 mil. This filter may be useful for microwave communication system.

Design and Analysis of UWB Filter with Single Notch Band

A Novel ultra-wide band (UWB) band pass filter (BPF) with triple notch bands using embedded quarter wavelength stubs is presented. The Ultra wide band filter structure consists five short circuited quarter wavelength stubs are placed at quarter wave length apart for achieving filter characteristics in frequency band between 3.1 to 10.6 GHz. Three quarter wavelength stubs are embedded in the feed line to provide notch at 4.4 GHz, 5.6GHz and 8GHz. The proposed filter structure is simulated using substrate GML1000 of dielectric constant 3.2 with height 0.762mm on electromagnetic circuit simulator. Simulated Frequency response exhibits multi band filter response I band (3.1-4.3 GHz), II band (4.5-5.5GHz), III band (5.8-7.8GHz) and IV band (8.2-10.6GHz) in the UWB band.

Mithilesh Kumar

Papers

Design frequency reconfigurable microstrip patch antenna for S-band applications

Analysis of Design Structuring and Performance of CPW Fed UWB Antenna in Presence of Human Arm Model

A new circular UWB microstrip antenna, and its characterization in time and frequency domains

Design and Analysis of UWB Filter with Single Notch Band

Design of multi notch band UWB filter