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This paper presents two tunable notch filters (TNFs) for detect-and-avoid (DAA) implementation in an ultra-wideband (UWB) radio system. The developed filters have relatively wide- and narrow-stopband, respectively, using two different resonant structures. A system experiment has been carried out to evaluate the influence of bandwidth of notch band on the system performance when the two different filters...
This paper presents a bandpass filter for ultra-wideband (UWB) radio systems at quasi-millimeter-wave frequencies (22 - 29 GHz) with a sharp notch at the restricted band. The developed bandpass filters are based on edge-coupled line structure, and designed by using electromagnetic simulation software and fabricated using wet-etching process. The sharp notch at the restricted band is realized by introducing...
An ultrawideband stubby antenna that covers all frequency bands between 824 MHz and 6 GHz, which include GSM 850 and 900, GPS, DVB-H US, DCS, PCS, UMTS, BT, WLAN 802.11b/g and WLAN 802.11a, with a VSWR better than 2.7:1 is described in this paper. The design procedure involves obtaining a wideband resonance from 1-6 GHz and using a matching network to compensate for the high capacitance of the antenna...
This paper presents a brief review and recent development of ultra-wideband (UWB) filters for microwave UWB radio system (from 3.1 to 10.6 GHz) using broadside-coupled structures. Design considerations and requirements for such UWB filters to meet the UWB regulation are described. Several recently developed UWB filters, including full FCC UWB bandpass filter, UWB lowpass filter, notch-band implemented...
An experimental investigation of the interference from signals of ultra wideband impulse radio (UWB-IR) to the existing wireless local area network (WLAN) systems is described. Transceivers of WLAN systems such as IEEE 802.11 b/g were emulated by a signal generator and a signal analyzer programmed by emulation software. UWB-IR signals were generated with an arbitrary waveform generator or a pulse...
This paper aims to reports the recent progress in developing UWB filters. Several advanced UWB filter structures are demonstrated with electromagnetic (EM) simulated and experimental results.
We consider a code-spread and chip-interleaved time-hopping (TH) multiple-access scheme for multiuser UWB communications. In such a system, each user's chip sequence is interleaved by a user-specific distinct random interleaver, and the receiver is a low-complexity chip-level iterative multiuser detector (MUD) which performs simple Rake-type combining to collect the energy dispersed in multipath UWB...
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