L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.

Novel single‐fed broadband circularly polarized antenna for GNSS applications

Abstract: This letter presents the design of a broadband microstrip CP antenna using single-fed technique. The feeding network is integrated within the coupling feed patch to simplify the structure. The proposed antenna is designed for Global Navigation satellite System (GNSS) operating at 1575.42 ± 10.23 MHz (GPS: L1 band), 1559∼1592 MHz (Galileo: E2-L1-E1 band), 1602 ± 5.625 MHz (GLONASS: L1 band) and 1559.052∼1591.788 MHz & 1610∼1626.5 MHz (BeiDou Navigation Satellite System B1 and L band). Another advantage of this antenna is the much wider bandwidth in both VSWR and 3 dB axial-ratio compared with traditional single-fed CP antennas. Details of design, simulated and experimental results of this CP antenna are presented and discussed. The measured results confirm the validity of this design which meet the requirement of GNSS applications.

Wideband Microtrip Bandpass Filters for Radio Astronomy Applications

Abstract: This paper presents wideband bandpass filters with a novel microstrip configuration. Using quarter-wavelength resonators, internal coupling between resonators was realized by interdigital capacitors (IDC) and capacitive open-ended stubs. Impedance steps, was utilized for external couplings. Two wideband filters at L band and C band with a fractional bandwidth (FBW) of 48% and 76%, respectively, were demonstrated as the concept for use in e-MERLIN receivers of radio astronomy applications. The measurement performance agrees well with the simulation.

Wide-band dual polarized probes for near field antenna measurements

Abstract: Wide-band, dual polarized probes based on an innovative self-balanced feeding scheme has been developed for high accuracy near field measurements. The innovative self-balanced feeding gives a reduction in cost and complexity while maintaining high performance standards. The overall simplicity makes the new technology attractive for probe designs in the L to Ka band range.

Comparison of Joint Canada‐U.S. Ocean Wave Investigation Project synthetic aperture radar data with internal wave observations and modeling results

Abstract: Comparisons are made of L band and X band SAR images with in situ measurements of surface currents and surface wave spectral perturbations for two of the Joint Canada-U.S. Ocean Wave Investigation Project internal wave data sets. Predicted and observed perturbations show agreement to within approximately a factor of 2 for L band, while the agreement at X band is much less satisfactory. Comparison of predicted microwave backscatter at X band with near-surface radar measurements indicates large discrepancies even when surface tilt and specular reflection effects are included in the model. Synthetic aperture radar (SAR) X band modulations compare favorably with near-surface radar measurements for range-traveling internal waves, but for other directions, the SAR modulations are smaller than the near-surface radar measurements. Simultaneous X and L band SAR images show comparable internal wave modulations.

L-band phased array for maritime satcom

Abstract: In this paper a phased array antenna for maritime satellite communications is described. The antenna consists of 26 patch elements that are mounted on a soccer-like spherical aperture. The antenna allows full duplex communication via L-band satellite systems like Inmarsat BGAN or Thuraya. This design is an innovative and powerful alternative to current mechanically steered systems. A fully functional demonstrator has been built and measured. The measurement results are in perfect agreement with the simulations. An outdoor live test on a ship will take place in summer 2010. The prototyping phase is about to start.