Hua Zhu

A high gain UWB Vivaldi antenna with band notched using capacitively loaded loop (CLL) resonators

A compact Vivaldi antenna with enhanced gain having band notch characteristics in the WLAN band (5.15-5.825GHz) is proposed. By using combination of corrugation and grating elements, the gain of antenna B is improved and the side lobe levels of the radiation pattern are reduced over the ultra-wideband (UWB). Based the high gain Vivaldi antenna B, the antenna C with the notch band limited by the WLAN is achieved with the help of printed, novel, capacitively loaded loop (CLL) resonators. To illustrate the effectiveness of the proposed design, the proposed antenna C is fabricated on 0.8 mm thick low cost FR4 substrate (39*45mm2) and measured. The measured results show that the antenna C operates for 2.9 GHz to more than 14 GHz with S11<; -10dB and significantly reject the 5-5.9 GHz frequency band.

Surface micro-machined high efficient and wideband cavity-backed patch antenna array for 60GHz radios

A wideband V-band cavity-backed circular patch antenna array is designed using a surface micromachining. The antenna array is excited by T-power divider. The T-power divider is designed using rectangular micro-coaxial transmission line. The antenna array with the specified size of 6.1mm×3mm×0.42mm and bandwidth shows around 10.3GHz (56.5~66.2GHz) under the condition of voltage standing wave ratio (VSWR) less than 2, which covers full-band standard of frequency range. Gain of the antenna array is up to 10.7 dBi gain at 61GHz, and the efficiency is 90%.

Surface micro-machined wideband circularly polarized antenna array for 60GHz radios

A 60GHz wideband circularly polarized E-shaped patch antenna array is designed using surface micromachining. The E-shaped patch is fully utilized to obtain good circular polarization performance. The antenna array is excited by four-way power divider. The four-way power divider is designed using rectangular micro-coaxial transmission line. The antenna array with the specified size of 12.5mm×5.7mm×0.62mm and bandwidth shows around 8GHz (59~67GHz) under the condition of voltage standing wave ratio (VSWR) less than 2, axial-ratio bandwidth was 11.1% (58.6~65.5 GHz), respectively. Gain of the antenna array is up to 13.3 dBi gain at 63GHz, and the efficiency is 90%.

A novel compact dual-band antenna based on composite right/left hand transmission line (CRH-TL) for WLAN application

A novel dual-band antenna by using CRLH-TL structure is proposed for the wireless local area network (WLAN) application. The dual-band behavior is achieved by loading shorted meander lines and interdigital capacitor to form unit-cell CRLH-TL loaded antenna. The bandwidth enhancement of proposed antenna can be achieved by merging the two extended-bandwidth resonances. The dual-band version exhibits two distinct resonances at 2.4GHz and 5.5GHz, with measured −10 dB bandwidths of 500MHz and 2.1GHz. The lowest resonance at 2.4GHz corresponds to a 47% reduction in the resonant frequency compared to a reference unloaded monopole. The size of proposed antenna is 30 × 20 × 1.6mm3. The measured gain reaches −1.6 dBi at 2.4Hz and 2.6 dBi at 5.5GHz, respectively. The measurement and simulation results show good agreement.

Design and Characterization of CMOS Transmission Lines in Sub-THz Region

ABSTRACT Microstrip line, coplanar waveguide, ground coplanar waveguide, and two kinds of slow-wave transmission lines (T-Line) are designed and realized based on a 0.13 μm Complementary Metal-Oxide-Semiconductor (CMOS) process. The radiation loss in the sub-THz region is evaluated by E-field distribution and attenuation coefficient versus the dimensions. Characterizations of these T-Lines up to sub-THz region is performed by sub artificial neural network (ANN) based on T-Line models and measurement results. The sub ANN-based model is capable of capturing the frequency-dependent effect of the resistance, inductance, conductance, and capacitance (RLGC) model up to sub-THz region, promising a compact and wideband modeling approach. The effect of dummy-filling on degrade of T-Lines performance in sub-THz region is also analyzed and evaluated by measurement and simulation results. Good agreement is obtained between the simulation, modeling, and measurement results.

Design of a SiGe BiCMOS on-chip slot antenna

This letter presents a 270-GHz on-chip cavity-backed slot antenna fabricated with 0.13-μm SiGe BiCMOS process. The proposed antenna, which consists of two parallel radiating slots at the top layer AM, is excited by a cross-shaped strip line at the second layer LY. The cross-shaped feeding strip line is connected with the CPW structure by via holes from AM to LY layer. The slot antenna is backed with a thin cavity formed by two inner metal layers and vias in between. The cavity prevents radiation from going inside the lossy silicon substrate and enhances the radiation of the slot antenna. The antenna shows a measured impedance bandwidth from 247.4 to 260.5GHz for S11 less than −10dB. The total area of this antenna is 0.46 × 0.48mm2.

Surface Micro-machined high gain cavity-backed patch antenna array for 60GHz radios

A high gain cavity-backed circular patch antenna array is designed by using surface micromachining technology. The antenna array is fed by eight-ways power divider, which is designed by using rectangular micro-coaxial transmission line. The antenna array with the specified size of 18.5mm×9.76mm×0.36mm and bandwidth shows around 6 GHz (59~65GHz) under the condition of voltage standing wave ratio (VSWR) less than 2, which covers China and Australia standard of frequency range. Gain of the antenna array is up to 18.2 dBi gain at 61.5GHz, and the efficiency achieves 85%.

Dual-polarized antenna array for WLANs application

A dual-polarized wideband antenna array is presented for 5-GHz band wireless local networks (WLANs) application. The antenna array consists of 8 printed dipoles with bow-tie structure, a feeding network and a metal wall with size around 120mm × 120mm. Every two printed dipoles are put orthogonally to realize dual polarization. The antenna bandwidth for two ports is around 1GHz under the condition of voltage standing wave ratio (VSWR) less than 2. The measured gains are around 13.8dBi and 14.1dBi for two ports, respectively. The beamwidth is 27°. Both the measured and simulated results agree well.

Tri-polarization and multi-band antenna for WLANs application

A tri-polarized wideband antenna is presented for wireless local networks (WLANs) application. The antenna consists of 2 printed dipoles and a monopole with size around 100mm × 100mm. Three antennas are put orthogonally to realize tri-polarization. The antenna bandwidth for three ports is around 1GHz under the condition of voltage standing wave ratio (VSWR) less than 2. The measured gains are around 7.8dBi, 7.2dBi and 6dBi for three ports, respectively. The beamwidth is 27 degrees. Both the measured and simulated results agree well.