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The main object of this thesis is to develop a Ka-band ground
transmitting/receiving antenna for the ROCSAT-1 Ka-Band personal
communication Experiment. To integrate dual-band, dual-
polarization ( 30 GHz for transmissio and 20 GHz for LHCP
reception ) into one microstrip antenna array structure is the
major task through this research, especially for high-gain array
application. For dual band operation, we use the two orthogonal
resonant modes of microstrip antenna with one side dimension of
patch reduced by locating three slots along the edge to elongate
the current flow length. Two layer feeding networks are then
implemented to prevent the coupling between two operation
frequency bands. In addition, the sequential rotation method is
applied for the element antenna arrangement to generate circular
polarization radiation. For the consideration of mechanical
accuracy and substrate thickness, the antenna array are designed
and implemented at the half frequency by frequency scaling
method. The simulation and antenna radiation pattern
measurement of this work use HP Momentum commercial available
tool and NSI Lite 233L near field measurement facility.
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