Jesus Alfonso Castaneda

A UHF Near-Field RFID System With Fully Integrated Transponder

This paper presents an RF identification (RFID) system with a fully integrated transponder. To enable the on-chip integration of the tags antenna, it is suggested to employ near-field coupling at high-frequency ranges, i.e., the UHF band. The RFID system including the reader and key blocks of the transponder is designed and fabricated in a standard CMOS 0.18-mum process. The system operates at 900 MHz with the coverage range of over 0.4 cm. The tags antenna is integrated on-chip without using any special process. The reader employs multiple coils to increase its coverage area. Using a proper output network, the reader can deliver a current of 225 mA (rms) to its coil, which is designed on a printed circuit board.

20.2 A 16TX/16RX 60GHz 802.11ad chipset with single coaxial interface and polarization diversity

The IEEE 802.11ad standard supports PHY rates up to 6.7 Gbps on four 2 GHz-wide channels from 57 to 64 GHz. A 60 GHz system offers higher throughput than existing 802.11ac solutions but has several challenges for high-volume production including: integration in the host platform, automated test, and high link loss due to blockage and polarization mismatch. This paper presents a 802.11ad radio chipset capable of SC and OFDM modulation using a 16TX-16RX beamforming RF front-end, complete with an antenna array that supports polarization diversity. To aid low-cost integration in PC platforms, a single coaxial cable interface is used between chips. The chipset is capable of maintaining a link of 4.6 Gbps (PHY rate) at 10 m.

A fully integrated transformer-based front-end architecture for wireless transceivers

A fully integrated transformer-based RF front-end architecture is presented that integrates matching, combining, and T/R switch functions on chip. The front-end is implemented in a 0.18 /spl mu/m CMOS Bluetooth transceiver achieving -90dBm receiver sensitivity and 2dBm transmit power from a 1.8V supply.

An integral equation analysis of an infinite array of rectangular dielectric waveguides

An integral equation analysis is applied to the study of the propagation characteristics of an infinite array of dielectric waveguides. The geometry under study is assumed to be rectangular. To find the Greens function of the structure, the Floquet theorem is applied such that the mutual coupling between dielectric waveguide elements is effectively included in the analysis. The effect of the coupling on the propagation characteristics of a dielectric waveguide is studied by varying the size of the Floquet cell. The validity of this analysis to simulate the case of an open dielectric waveguide is confirmed by a comparison with previous results, this in spite of the fact that radiation and leaky wave modes are not accounted for. The complex modes due to the periodicity of the structure are found and their properties are described. The analysis presented, with minor modification, can deal with the problems of dielectric image lines, or dielectric-loaded metallic waveguides. >

A Fully Integrated Quad-Band GPRS/EDGE Radio in 0.13μm CMOS

This radio integrates all the receive and transmit functions required to support a quad-band GSM/GPRS/EDGE application into a single CMOS chip. Compared to the published work, this transceiver is implemented in low-cost digital 0.13 mum CMOS, achieves a superior receive and transmit performance, and yet has up to 2x lower receive power consumption, a key requirement in cellular applications.

Design and analysis of a multi-layer transformer balun for silicon RF integrated circuits

In this paper, we present the design and analysis of an on-chip transformer balun for silicon RFICs. Both the primary and secondary spread over four metal layers along a common symmetric axis to reduce the overall area, maintaining reasonable quality factor. A five port transformer balun circuit model is developed to facilitate the device simulation. A 4:11 transformer balun is fabricated and tested. It is ideal for LNAs to enhance the gain with optimum noise figure.

Design and analysis of on-chip symmetric parallel-plate coupled-line balun for silicon RF integrated circuits

In this paper, we present the design and analysis of an on-chip transformer balun for silicon RFIC. High-performance on-chip transformer baluns for low-noise amplifiers and power amplifiers on multi-layer radio-frequency integrated circuits are constructed. Single-end primary and differential secondary are constructed on different dielectric surface planes. The metal windings of the primary and secondary are in parallel to form coupled lines. Both the primary and the secondary are designed symmetrically for differential operation. Additional layer interfaces and vias are used to provide bridges to assure the geometric symmetry. Examples of designs with test results are discussed.In this paper, we present the design and analysis of an on-chip transformer balun for silicon RFICs. High-performance on-chip transformer baluns for low-noise amplifiers and power amplifiers on multi-layer radio-frequency integrated circuits are constructed. Single-end primary and differential secondary are constructed on different dielectric surface planes. The metal windings of the primary and secondary are in parallel to form coupled lines. Both the primary and the secondary are designed symmetrically for differential operation. Additional layer interfaces and vias are used to provide bridges to assure the geometric symmetry. Examples of designs with test results are discussed.

A novel printed sinc antenna for wireless communications

A novel printed antenna resembling a truncated sinc function is proposed for wireless communications. The proposed antenna functions either as a twisted dipole or two twisted back-to-back connected L-shape dipoles depending on the current mode. Due to the symmetry, the antenna supports an even or odd mode of current on the antenna and results in different design and performance considerations. The sinc antenna is suitable for WLAN single or dual frequency operation. Several examples of the design are discussed.

PRINTED DIPOLE CHARACTERISTICS IN A TWO-LAYER GEOMETRY WITH UNIAXIAL ANISOTROPY

ABSTRACT The characteristics of printed antennas in a two-layer anisotropic substrate are investigated. This includes input impedance of a ceneter-fed dipole, radiation efficiency, antenna gain and radiation patterns. The analysis adopts the moment method solution of the integral equation where various numerical techniques are applied to enhance the computational efficiency. The effects of substrate and superstrate anisotropy on the antenna characteristics are also described.

60GHz waveguide array design for MIMO channel characterization

From a theoretical point of view, the multiple input multiple output (MIMO) approach seems to be one of the best solutions to characterize the communication channel in the 60GHz frequency range. This paper describes the design of a high-gain antenna array with beamforming capabilities working in the millimeter-wave region suitable for such channel measurements. The array consists on 8 horn antennas, separated half wavelength and independently fed by individual transceivers. A simulated gain around 15dB is achieved over the bandwidth from 57–63GHz. The antenna can also provide beamforming with tilt from broadside up to +/− 60deg.