Search Results - "Chaloupka, H.J."
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A high-temperature superconducting duplexer for cellular base-station applications
Published in IEEE transactions on microwave theory and techniques (01-08-2000)“…This paper presents a recent investigation of a high-temperature superconducting (HTS) duplexer for cellular base-station applications. The duplexer consists…”
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Journal Article -
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Comments on "Wave propagation properties in high-temperature superconducting parallel-plate waveguides"
Published in IEEE microwave and guided wave letters (01-03-2000)“…For the original paper see ibid., vol. 9, no. 5, p. 183-185 (1999). The commenter claims that the aforementioned paper contains some fundamental errors,…”
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Performance enhancement of smart antennas with reduced element spacing
Published in 2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003 (2003)“…This paper addresses the problem of degradations in adaptive digital beam-forming (DBF) systems caused by mutual coupling between array elements. The focus is…”
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Conference Proceeding
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Compact reactively reconfigurable multi-port antennas
Published in 2006 IEEE Antennas and Propagation Society International Symposium (2006)“…This paper presents a new approach for a hybrid solution, where a relatively low number of ports (e.g. N = 2) allows low-dimensional simultaneous beam…”
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Conference Proceeding -
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YBaCuO disk resonator filters operating at high power
Published in IEEE transactions on applied superconductivity (01-06-1999)“…We have developed and successfully operated a compact tunable one-pole filter at 2 GHz for transmitter combiners in mobile radio base stations. The concept is…”
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Journal Article Conference Proceeding -
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An HTS transceiver for third generation mobile communications
Published in IEEE transactions on applied superconductivity (01-06-1999)“…Future third-generation mobile communication systems will require improved sensitivity and selectivity to support the growth in multi-media services, increased…”
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7
Thin film HTS passive microwave components for advanced communication systems
Published in IEEE transactions on applied superconductivity (01-06-1999)“…This paper presents results of thin film high temperature superconducting (HTS) passive microwave components recently developed for advanced communication…”
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Journal Article Conference Proceeding -
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On signal distortion in compact UWB arrays due to element interaction
Published in 2005 IEEE Antennas and Propagation Society International Symposium (2005)“…Ultra-wideband (UWB) technology offers significant advantages in high resolution ranging due to the superior time-of-arrival (TOA) resolution. In order to…”
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Conference Proceeding -
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Novel MIMO Antennas for Mobile Terminal
Published in 2008 38th European Microwave Conference (01-10-2008)“…Radiation from a small device is dominated by the chassis, not only by the antenna structure attached to it. We propose a MIMO antenna system considering the…”
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Conference Proceeding -
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MIMO antenna system based on orthogonality of the characteristic modes of a mobile device
Published in 2007 2nd International ITG Conference on Antennas (01-03-2007)“…A novel concept is introduced to realize a multiple antenna system on a small mobile device by coupling to its characteristic modes. According to the theory,…”
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Conference Proceeding -
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Novel MIMO antennas for mobile terminal
Published in 2008 European Conference on Wireless Technology (01-10-2008)“…Radiation from a small device is dominated by the chassis, not only by the antenna structure attached to it. We propose a MIMO antenna system considering the…”
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Conference Proceeding -
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Novel approach for diversity and MIMO antennas at small mobile platforms
Published in 2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754) (2004)“…Small arrays with closely spaced elements are analyzed with respect to the impact of mutual coupling on gain degradation and correlation between different port…”
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Conference Proceeding -
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Design approach for a class of compact multiport antennas
Published in 2005 IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (2005)“…In contrast to conventional arrays compact multiport antennas require each port to make use of the entire radiation structure in order to provide uncorrelated…”
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Conference Proceeding -
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On the properties of small arrays with closely spaced antenna elements
Published in IEEE Antennas and Propagation Society Symposium, 2004 (2004)“…In a multipath-rich environment, increased capacity can be gained by replacing SISO with MIMO communication systems. However, at mobile terminals, the…”
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Conference Proceeding -
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Port decoupling for antennas with narrow element spacing
Published in 7th European Conference on Wireless Technology, 2004 (2004)“…Two-port antennas with narrow element spacing are in general governed by strongly correlated port patterns and gain reduction. Whereas the correlation between…”
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Conference Proceeding -
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High-Q tunable YBCO disk resonator filters for transmitter combiners in radio base stations
Published in 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192) (1998)“…Results on the development of a tunable HTS resonator structure for transmitter combiners of radio base stations are reported. The design goal was the…”
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Conference Proceeding