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.

/pdf/response-to-fcc-98-208-notice-of-inquiry-in-the-matter-of-3attixctl7.pdf

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

A compact, low profile UWB monopole antenna is presented for Ultra wideband applications. A Monopole reference antenna design on the FR4 substrate of size 28.3 × 24 mm2 without defected ground structure (DGS) and results are analyzed in terms of impedance bandwidth, mutual coupling, radiation patterns and antenna gain with the help of CST Microwave studio and then proposed UWB monopole antenna is also design on the same substrate with DGS. All the results are also simulated and analyzed for the same. A comparative study carried out between these two designs and analyzed that proposed UWB monopole antenna enhanced impedance bandwidth from 3.7 GHz–14.9 GHz(without DGS) to 3.4 GHz–20 GHz (with DGS) and group delay is also satisfactory, which makes the proposed antenna is a good candidate for portable UWB applications.

http://ieeexplore.ieee.org/iel7/7589474/7724213/07724525.pdf

Design and optimization of ultra wide band monopole antenna with DGS for microwave imaging

A frequency band reconfigurable antenna is designed and experimentally analyzed. Proposed design achieve UWB (3.1–10.6 GHz), two dual band and two narrow band switching states by implementation of PIN diodes inside the slotted ground. Antenna covers the various wireless standards WLAN, WiMAX, WiFi and UWB with return loss S11 < −10 dB. Proposed antenna is also operating at 9.2 GHz to include the airborne radar applications. Simulated and experimental results are compared and found to be in good agreement.

/pdf/frequency-reconfigurable-uwb-antenna-design-for-wireless-1hk4wzmz68.pdf

Frequency Reconfigurable UWB Antenna Design for Wireless Applications

This paper presents a novel square microstrip patch on the hybrid substrate that includes a square an unbiased ferrite ring in the Rogers TMM4 substrate, initially at a distance of the one-quarter of the free space wavelength from the edges of patch. Using CST Microwave studio, the results of the patch antenna above a conventional substrate (i.e., Rogers TMM4 substrate without any ferrite ring) and above the hybrid substrate (Rogers TMM4 substrate with ferrite ring) are simulated and compared. The proposed microstrip path antenna resonates at the 5.8 GHz suitable for wireless local area network applications. By this substrates design there is enhancement in gain as well as bandwidth of microstrip patch antenna.

Gain enhancement in a novel square microstrip patch antenna using hybrid substrates

In this paper a planar ultrawide band bandpass filter with dual notched behavior is proposed This filter is designed using interdigital finger structure on planar configuration This interdigital finger resonator is providing us the ultrawide band with two notches one at 565GHz and other is at 715GHz As WLAN and few satellites communication systems interfere with UWB radio system The filter is compact in size with dimension 17 × 17 × 1 mm3 with the ground plane For designing the proposed structure FR-4 substrate of thickness 1 mm and with Dielectric constant 49 is used The electromagnetic simulation software, computer simulation technology microwave studio (CST MWS) is used for the simulation and analysis of the designed structure The working frequency of UWB filter is 31 to 106GHz and rejecting the frequencies 565GHz and 715GHz The insertion loss of first notch band is −17dB and for second notched band insertion loss is −15dB

Ultra wideband planar bandpass filter with dual notch behavior

In this paper, a wideband circular micro strip patch antenna design is proposed and it will be suitable for wireless communication for GPS, GSM, CDMA, 3G, 4G, Wi-Fi, W-MAX, Bluetooth, and W-LAN. This antenna is designed on dielectric substrate that having the dielectric constant 3.2 and height of substrate is 0.762mm. The proposed structure of the antenna is simulated on CST simulation software and the simulated return loss is less than-10dB for the frequency range 1.6 - 15 GHz and higher frequencies. A circular micro strip antenna is a narrow band but with the modified ground plane, this antenna shows the wideband response because it's Q (Quality factor) and bandwidth is inversely proportional to Q, therefore a narrowband circular patch work as a wideband antenna. The proposed antenna can be used for GSM, GPS, PCS, Bluetooth, W-LAN and UWB spectrum.

Mithilesh Kumar

Papers

Design and optimization of ultra wide band monopole antenna with DGS for microwave imaging

Frequency Reconfigurable UWB Antenna Design for Wireless Applications

Gain enhancement in a novel square microstrip patch antenna using hybrid substrates

Ultra wideband planar bandpass filter with dual notch behavior

A Wideband Circular Patch Antenna with Low Pass Filter on a Same Substrate for Rectenna Application