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

Recent developments in the wireless communication industry continue to drive the requirements for small, compatible, and affordable reconfigurable antennas. To overcome the challenges of multi-frequency operation a new scheme of frequency reconfiguration is proposed. In the proposed design a rectangular patch antenna with slots at the centre frequency 10 GHz that can be reconfigured in the frequency range of 10–10.5 GHz. The reconfiguration is carried out by switching the diodes ON/OFF. The antenna is designed on FR4 substrate (e r = 4.54) of thickness (H) 1.50 mm. The proposed structure was simulated by using the electromagnetic (EM) simulation software. The simulated return loss for different configuration are less than −10dB at resonance frequencies. The simulated are very exciting and show the close agreement with proposed design.

Design of frequency reconfigurable microstrip patch antenna

In this paper a square monopole antenna has been proposed which can be used for Ultra Wideband applications. Band- notch performance is introduced by an E-shaped slot on the patch. The dimensions are optimized to give not only the usual 3{10GHz bandwidth with rejection in the 5{6GHz band which is commonly used for WLAN, but also short received pulse duration when transmitted and received using a pair of these antennas. The demonstration of short received pulse-width is the primary novelty reported. The performance is verifled by time domain measurements, in addition to the usual antenna characterization.

/pdf/an-ultra-wideband-antenna-with-band-reject-capability-and-1zxkeboocg.pdf

An Ultra-Wideband Antenna with Band Reject Capability and its Characterization in Time Domain

There has been a tremendous rumble in UWB research after the U.S. Federal Communications Commission (FCC) allocated a frequency range with a bandwidth of 7.5 GHz from 3.1–10.6 GHz for UWB applications. Ultra wideband (UWB) technology was earlier limited to special applications, primarily in the military area and there primarily to electronic warfare. The antennas were usually horn antennas or modified, ridged horn antennas, sometimes in combination with reflectors. Wearable intelligent textile system is an innovative fast growing field in application oriented field. In recent years, body-centric wireless communication becomes an important part of fourth generation mobile communication systems (4G). Utilization of wearable textiles in the antenna segment has been seen on the rise due to the recent miniaturization of wireless devices. Wearable and fabric-based antennas have become one of the dominant research topics in antennas for body-centric communications. The review presented here intended to disclose the unconventional antenna technology including UWB technology for wearable applications. Contributions by various researchers have been compiled keeping in mind background of UWB technology, the wearable antenna, and specification of the antenna, material for the antenna and analysis that must be done to design proper UWB wearable antennas for various applications.

/pdf/advancement-in-ultra-wideband-antennas-for-wearable-i3qfm47uos.pdf

Advancement in Ultra Wideband Antennas for Wearable Applications

A vertex-fed hexa-band frequency reconfigurable antenna for wireless applications

In this paper, a patch antenna with band notched characteristics for ultra wide band is proposed. The proposed antenna design is simulated on electromagnetic (EM) simulation software using FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6 mm. The proposed antenna has a compact structure, the total size is 15&#x00C3; -- 14.5 mm2 and fed with 50 &#x00CE;&#x00A9; micro strip by optimizing the width of partial ground, the width of the feed line to operate in UWB. With the design, the return loss is lower than 10 dB in 3.1-10.6 GHz frequency range and show the band-notch characteristic in the UWB band to avoid interferences, which is caused by WLAN (5.15&#x00E2;"5.825 GHz) and WiMAX (5.25&#x00E2;"5.85 GHz) systems. In addition, band-notched filtering properties in the 5.15-5.825 GHz are achieved by rectangular slot on the radiating element. The proposed antenna is easy to integrate with microwave circuitry for low manufacturing cost. The antenna structure is flat, and its design is simple and straightforward.

Mithilesh Kumar

Papers

Design of frequency reconfigurable microstrip patch antenna

An Ultra-Wideband Antenna with Band Reject Capability and its Characterization in Time Domain

Advancement in Ultra Wideband Antennas for Wearable Applications

A vertex-fed hexa-band frequency reconfigurable antenna for wireless applications

A Novel UWB Band Notched Rectangular Patch Antenna with Square Slot