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A new high performance maritime rescue antenna is presented, including VHF, UHF and GPS bands in buoy miniaturization environment. By using innovative method of coaxial design, each of their desired radiation pattern and return loss are achieved. Specially, two VHF antennas, with 10dB impedance bandwidth of 4% (155-162MHz) and 8% (230-250MHz) respectively, port isolation of 15dBi are carefully designed. Meanwhile, the gain of VHF antennas is greater than 2dBi in elevation plane and the variation less than 1dBi in azimuthal plane. Circularly polarized UHF antenna achieves the wide beamwidth of 120 degrees at 406MHz, under the gain of 4.5dBi in elevation plane and axis ratio less than 3dBi with quadrifilar spiral inverted-F structure and shorted stub. GPS antenna is in the form of microstrip patch, which has good radiation characteristics. All antennas are finally verified by both simulations and measurements, showing their great potential applications in maritime rescue system.

A novel structure of bondwire and microstrip lines for Chip-to-Chip inter-connection up to 130GHz is firstly pre-sented in this paper. Its realization is based on PCB heterogeneous integration process. In order to reduce its high inserted loss which mainly caused of high inductance of the bondwire, the microstrip line of the structure is then optimized. Simulated results show that the minimum insertion loss of 1.0 dB for the structure can be achieved, with the bandwidth more than 35 GHz in bands of 100-135 GHz.

A miniaturized and high frequency response 35 GHz frequency modulated continuous wave (FMCW) radar system is presented for short range target detections. The system mainly consists of two antennas, a single chip transceiver and a signal processor. Thanks to our design and integrated techniques, high performance of the system is achieved and also verified by experimental results using our fabricated prototype. Our results show that the detection accuracy of 0.2m can be achieved for 15cm *15cm metal targets within detection distance of 12m, along with the radar system total size of 29mm in diameter, which agrees well with our design.

This paper proposes a graphene loaded microstrip patch antenna with tunable frequency at THz. The antenna consists of a rectangular patch with a graphene pad connected to the radiating edge of antenna, and a broadband DC bias circuit to apply bias voltage to graphene pad. Meanwhile, the DC bias circuit can achieve open circuit to high frequency signal, which reduces the influence of DC bias circuit on the input impedance of the antenna. The surface impedance of graphene can be dynamically controlled by changing the applied bias voltage, thus the input impedance of the antenna can be adjusted. Then the tunable frequency of the antenna is realized. A prototype antenna operating at the frequency of 300GHz. The proposed design can achieve linear frequency tunability in the range below the initial operating frequency.

This paper presents a tunable frequency microstrip patch antenna using graphene. The antenna consists of a rectangular patch with a graphene pad connected to the radiating edge, and a metallic via used to connect graphene pad and ground. The imaginary part of the surface impedance of graphene is larger than that of the real part in THz band. So graphene can be regarded as a reactance component loaded into patch antenna. The surface impedance of graphene can be controlled by changing the applied bias voltage, thereby controlling the input impedance of the antenna. Then the tunable frequency of the antenna is realized. A prototype antenna operating at the frequency of 300GHz. The proposed design can achieve linear frequency tunability in the range above the initial operating frequency.