Quadrature phase shift keying (QPSK) and binary phase shift keying (BPSK) modulators are used to change the amplitude, frequency, and/or phase of a carrier signal in order to transmit information. QPSK devices modulate input signals by 0°, 90°, 180°, and 270° phase shifts. BPSK devices modulate input signals by 0° and 180° phase shifts. Both QPSK modulators and BPSK modulators are used in conjunction with demodulators that extract information from the modulated, transmitted signal. Some QPSK modulators and BPSK modulators include an integral dielectric resonator oscillator. Others are suitable for military or wireless applications. QPSK modulators and BPSK modulators with root raised cosine (RRC) and Butterworth filters are also available.