A differentially-fed complementary antenna for WiGig applications

A differentially-fed complementary antenna array is introduced in this paper. Coplanar waveguide (CPW)-fed planar slot antennas are inherently narrow in bandwidth. Modification on widening open-ends of the slot is the most popular technique for bandwidth enhancement. An alternative approach is to use complementary sources. In this paper, a new stacked structure of complementary antenna is proposed which utilizes a regular slot antenna to act as a magnetic source and a parasitic dipole allocated across the slot to act as an electric source. This antenna array, fabricated on generic microwave substrate with simple plated-through-hole printed-circuit technology, achieves an impedance bandwidth of 25% from 53 to 68 GHz for VSWR <; 2. It also yields a stable gain of 11.5 dBi across the entire operating band from 56 to 67GHz.