Abstract
Ultra-Wideband (UWB) systems are widely used in low-power, high-speed, high-security short-range wireless communication systems throughout digital homes and offices. In the RF front-end of a UWB system, bandpass filters (BPFs) are used to put through the passband signals and reject the stopband signals. Most UWB BPFs are designed with dielectric materials on circuit boards or LTCC technology. In this paper, a very compact fully integrated UWB chip filter is proposed and designed on a GaAs substrate with nitride as dielectric layers to meet the small size requirement of portable devices for next-generation UWB applications. The filter is constructed with a modified Chebyshev structure. The final filter circuit contains only four inductors instead of six for the conventional Chebyshev filter, which makes the chip more compact and cost effective. The filter is designed and fabricated on a 0.25 μm GaAs pHEMT technology with a chip size of only 0.73 mm × 0.51 mm including the chip edge and scribe line area, while the filter core area is only 0.61 mm × 0.39 mm, including bonding PADs. The measurement results illustrated that the proposed BPF shows a passband covering the frequency range of 3.1–9.0 GHz, the minimum passband insertion loss is only 1.5 dB, the stopband rejection is better than −30 dB throughout frequencies below 2 GHz and above 12 GHz, S11 is less than −16 dB, and S22 is better than −11 dB during the whole passband range. It demonstrated that the proposed filter can be considered as one of the most compact UWB filters.
Highlights
Ultra-Wideband (UWB) systems are widely used in short-distance wireless ranging, positioning and data transfer based on their features of low power, high speed, and high security
The signal power is extremely low as −41 dBm over the whole spectrum range; the UWB system is difficult to intercept, and interference on other wireless systems caused by UWB signals is very low [1]
Instead of modifying the structure of strip line resonators, ring resonators, inductors, or capacitors, as presented in previous works, we improve the performance of the proposed UWB filter in circuit topology by introducing a modified Chebyshev resonator network
Summary
Ultra-Wideband (UWB) systems are widely used in short-distance wireless ranging, positioning and data transfer based on their features of low power, high speed, and high security. The bandwidth of a UWB standard system is 7.5 GHz covering the 3.1 to 10.6 GHz frequency range, while a data rate up to 500 Mb/s can be achieved. UWB techniques show large potential in next-generation communication scenarios, such as smart wearable devices, ranging and positioning for intelligent logistics and factories, and next-generation high-speed personal area networks (WPANs). UWB technology is commonly used in indoor positioning in order to present enhancements in terms of achieving high resolution and accuracy, low probability of interception, multipath immunity, and the ability to combine positioning and data communication. Localization systems based on UWB technology achieve an accuracy in one system
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