Balun

About: Balun is a research topic. Over the lifetime, 5375 publications have been published within this topic receiving 52256 citations. The topic is also known as: Telephone balance unit.

Printed circuit balun with a dipole antenna

Abstract: A coplanar printed circuit balun for connecting an unbalanced feedline to a balanced dipole antenna.

V-band balanced resistive mixer in 65-nm CMOS

Abstract: We report a wideband resistive mixer fabricated in 65-nm CMOS for 60-GHz frequency range. The local oscillator signal balancing is implemented with an on-chip spiral balun. The broadband response of the balun enables wideband local oscillator tuning range. The mixer topology is suitable for both up- and downconversion. We present the on-wafer measurement results in both of these mixing modes. In downconversion, the mixer achieved 12.5 dB of conversion loss and +5 dBm of 1-dB input compression point. In upconversion, the measured conversion loss was 13.5 dB with -19 dBm of 1-dB output compression point. The local oscillator suppression was better than 34 dB for an LO frequency from 51 to 62 GHz. The size of the mixer including pads is 0.47 mm2.

Miniaturized balun transformer

Abstract: A balun circuit includes a dielectric substrate having planar opposing surfaces: a groundplane conductor layer disposed on a first opposing surface; an interlayer conductor layer disposed on a second opposing surface and including first and second electrically isolated conducting strips, with a balance point gap between first ends thereof, and second ends thereof being short-circuited; an interlayer dielectric layer having substantially planar opposing surfaces, with a first opposing surface thereof being disposed over the interlayer conductor layer; and a top conductor layer disposed over a second opposing surface of the interlayer dielectric layer and including a third conducting strip overlying the first and second conducting strips, one end of the third conducting strip providing an unbalanced port terminal and another end of the third conducting strip being open-circuited. The third conducting strip includes a first and a second set of series-connected line sections each having diverse impedances which are a mirror opposite of each other relative to a center plane of the balun circuit. The first and second conducting strip have impedances which are a mirror opposite of each other relative to the center plane of the balun circuit. The impedances of the first and second conducting strips can be diverse impedances. Phase and amplitude balance at the balance point gap is achieved by the mirror opposite relationship of the impedances of the first and second set of line sections and the mirror opposite relationship of the impedances of the first and second conducting strips.

Quad-Band Probe-Fed Stacked Annular Patch Antenna for GNSS Applications

Abstract: A novel probe-fed stacked annular patch antenna is proposed for Global Navigation Satellite System (GNSS) applications. The antenna has been designed to operate at the satellite navigation frequency bands including GPS, GLONASS, BDS-1, and BDS-2. In the design, four annular patches are stacked to achieve multiband operation and compactness. Quadrature phase feed network comprising four 90° stripline baluns is employed to ensure circularly polarized (CP) radiation. Another key feature of our design is the stepped-radius shorting pillar to reduce the well-known inductance due to longer feeding probes. The final antenna exhibits good impedance matching, broad pattern coverage, and pure CP performance at all designed bands. Details of design considerations and experimental results are presented and discussed.

Wideband Reconfigurable Crossed-Dipole Antenna With Quad-Polarization Diversity

Abstract: A design for antennas with quad-polarization diversity is described. The antenna structure is mainly composed of a reconfigurable crossed-dipole fed with coaxial baluns and a switchable feeding network. By controlling the states of p-i-n diodes embedded in the balun feeds, the crossed dipole can generate vertical and horizontal polarization radiations, and the phase of each polarization mode can be switched between 0° and 180°. As for the feeding network, it has four output ports and only two output ports are set to be active to excite the crossed dipole at a time. By integrating the crossed dipole with the feeding network, the resultant antenna can provide four polarization modes, including ±45° linear polarizations (LPs) and dual-orthogonal circular polarizations (CPs). Moreover, the overlapped operation bandwidth of the four polarization modes is more than 35%, and within the bandwidth, the cross polarization level of the LP modes is less than −20 dB and the axial ratio of the CP modes is smaller than 3 dB. Good impedance matching is also achieved for each polarization mode.