This paper presents a quasi-TEM equivalent circuit model for two optically driven coplanar waveguide (CPW)-fed slot antennas. This model takes into account both the electromagnetic fields in the CPW structure as well as the effects of the discontinuities of the antenna design. The results are compared with simulations taken from IE3d using the method of moments.

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A uni-traveling camer waveguide integrated photodiode (UTC-WIP) combining the advantages of a coupled waveguide integrated photodiode (WIP) [ 1-21 and a mi-traveling camer photodiode (UTC-PD) [3-61 is investigated. Preliminary measurement results show that the DC responsivity is 0.4 A/W without antireflection coating, and the peak pulse response can reach 94 mA (4.7 V across a 50 Q load) when the bias voltage is -9 V. The resulting device is capable of operating at 20GHz. The IP3 at 1 GHz and 18 GHz are 24 dBm and 8 dBm, respectively.

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This paper proposes the integration of an antenna with a photodetector for high capacity wireless communications. A waveguide photodetector (WGPD), illuminated on the side, is used to convert the RF‐modulated optical power into a microwave signal. That microwave signal is used to feed an antenna built on the same plane as the photodetector. The WGPD is a standard p‐i‐n device grown on a semi‐insulating InP. The performance of this RF/photonic antenna in the frequency range 17–20 GHz is studied theoretically and experimentally. An equivalent circuit model for the WGPD is developed to predict the photodetector impedance as a function of frequency. The photodetector is matched to the input impedance of the antenna. The agreement between measurement and the circuit model results for the WGPD impedance is very good. It is envisioned that a large number of such RF/Photonic antenna elements could be networked together into a star configuration, feeding in and out of a radio hub. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 179–184, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10550