This invention presents a new class of integrated rectangular Substrate integrated Waveguide (SIW) filter and microstrip patch antenna for RF/microwave front-end subsystems to produce filtering and radiating element in a single device ad would be useful in any microwave RF front systems where the reduction of overall physical volume and cost is very important. Wireless products and services such GSM, WLANs, LTE and satellite application are using microwave devices, such as filter and antenna. Therefore those applications require good performance, low-profile and small size filter and antenna that can be embedded in wireless products.