CROLS,. I. , and STEYAERT, M.: 'Switched-opamp: an approach to realize full CMOS switched-capacitor circuits at very low power supply voltages', IEEE J. Solid-State Circuits, 1994, pp. 936-942 2 BASCHIROTTO,A., and CASTELLO,R.: 'A 1V 1.8MHz CMOS switched-opamp SC filter with rail-to-rail output swing'. IEEE Int. Solid-state Circuits Conf. (ISSCC97), Digest of technical papers, pp. 58-59

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With the appropriate placement of the slots and via holes, the microstrip second higher order leaky-mode antenna fed by a microstrip is presented. Two main beams with titled angles from the strip are measured in the predicted radiation leaky band. The leaky band of the microstrip second higher order mode is deduced from the characteristics of the propagation constants that are calculated by the spectral domain analysis. The proposed feeding method provides a direct connection with the circuits based on the microstrip line. Index Terms-Antenna feeds, leaky-wave antennas, microstrip. Communication Engineering, National Chiao TungUniversity, Hsinchu, Taiwan, R.O.C., where he is currently a Professor. His current research interests include numerical methods in electromagnetics, characterization and design of microwave and millimeter-wave planar circuits, and analysis and design of microwave and millimeter-wave antennas.Jyh-Wen Sheen received the B.S. degree in control engineering and the M.S. and Ph.D. degrees in communication engineering from the National Chiao and is an RF Engineer and is currently developing a miniaturized RF filter and high-gain antenna. His research interests include the analysis and design of various planar-type leaky-wave antennas and the investigation of surface-wave leakage phenomena of uniplanar transmission lines.

EXCITATION OF THE MICROSTRIP' HIGHER ORDER LEAKY MODESTo excite the microstrip leaky modes, the first step is to determine the frequency band where A simple method for exciting the microstrip higher order leaky modes is demonstrated in the paper. Properly arranging narrow slots on the ground plane where the vertical electric fields are small can excite these higher order modes. The experiments of excitation of the second and the third higher order leaky modes are carried out to verify the practicability. It is suitable to develop new microwave device and radiation source, such as applications in multi-beam antenna design.

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