Electrically Small Matched Antennas With Time-Periodic and Space- Uniform Modulation

A conceptual method to realize an impedance-matched electrically small antenna is discussed, using a transmission line modulated only in time. The time-periodic space-uniform modulation of distributed shunt array varcapacitors excites mode with very frequency but still (microwave) wavelength: the matching then retains practical size. brings problem impedance $f_0$ much higher than signal, where large reactance can be easily compensated bandwidth for same $Q$ factor: actually $\Delta f= f_0 / Q$ becomes when larger signal frequency. simple way obtain space uniform illustrated, making use Wheatstone-bridge arrangement varicaps. and modulating lines, running parallel on section length, see two different equivalent capacitances, so that voltage almost while may change significantly across line.